GM Automobile Parts V6 90 Degree User Manual
Application Manual  
Gasoline 4.3L  
V6 90 Degree  
2001 ModelYear  
General Motors  
Powertrain Group  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
1 . 0 INTRODUCTION  
This manual assists the reader in the application of the 4.3L V6 90 Degree family of engines to  
Transportation Vehicles, Marine and Industrial applications. It gives an overview of the engine, its  
features, and systems. Details are provided on typical interfaces between the engine, related  
subsystems, and the vehicle.  
Caution:  
The performance of the engine is dependent on the specific application. It is recommended that the  
owner of this document be contacted before specific application decisions are made.  
2 . 0 PRODUCTSUMMARY  
2 . 1  
APPEARANCE  
The figure 2.1-I shows the 4.3L V6 90 Degree Engine.  
L35 Isometric View  
Figure: 2.1-I  
2 . 2  
FEATURES  
The model year 2001 for 4.3L V6 90 Degree Engine has one version: L35.  
This Engine has specific values of power and torque, which allow for a very wide range of  
application up to 15000 Lbs. GVW.  
The more distinctive common features of this family of engines are:  
-Optimized Intake Manifold  
-Stiff Oil Sump  
-High reliability and durability  
-OBDII compliant  
File: c:\data\manuales\v6-truck\am43v6#3.doc  
Contact:Luis Nespolo - (248) 857-1558  
Printed: 8/15/00  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
2 . 3  
PRODUCTSPECIFICATION SUMMARY  
2.3.1 SPECIFICATION  
ENGINE  
L35  
L35  
Marine  
UNITS  
Truck Application  
Application  
PERFORMANCE  
Rated Power  
Rate Power Speed  
Rated Torque  
Rated Torque Speed  
Torque Extension Speed Range  
(From Peak Torque to Peak Power)  
Exhaust Restriction at Rated Power  
(Better than)  
200  
4600  
260  
223  
4800  
275  
hp  
rpm  
Lb. ft  
rpm  
2800  
3800  
1800  
8.85 to 8.58  
@ 4600 rpm  
1000  
0
rpm  
in hg  
Piezometer  
Inlet Restriction at Rated Power w/Filter  
-0.89  
@ 4600 rpm  
0
in hg  
Piezometer  
Redline Speed  
Fuel Cut-Off Speed, Nominal Conditions  
Fuel Cut-Off Speed, Cold Conditions  
5000  
5200  
5200  
(-40)  
5000  
5200  
5200  
(-40)  
rpm  
rpm  
rpm  
Maximum Upshift Speed  
Minimum Idle Speed  
Minimum Unassisted Start Temperature  
PHYSICAL/CONTENT  
Type:  
5100 Man - 5200 Auto  
N/A  
650  
-20  
rpm  
rpm  
Degree C  
525  
-20  
4 Cycle  
4 Cycle  
Service Type  
Naturally Aspirated  
Naturally Aspirated  
Configuration:  
Bank Angle:  
V
90  
V
90  
Degree  
Number of Cylinders:  
Valvetrain Configuration:  
Number of Valves per Cylinder:  
Displacement:  
Bore:  
Stroke:  
6
OHV  
2
4302  
101.6  
6
OHV  
2
4302  
101.6  
88.4  
cc.cm  
mm  
mm  
88.4  
Compression Ratio:  
Firing Order:  
Rotational Direction:  
Fuel Injection Pump  
Certification  
9.4:1  
1-6-5-4-3-2  
CW  
9.4:1  
1-6-5-4-3-2  
CW  
Electronic  
N/A  
Electronic  
Federal & California  
200  
Engine Mass  
200  
Kg  
Spark Plugs  
Oil Filter  
Controller  
41-932 (0.060”)  
PF-52  
41-932 (0.060”)  
PF-52  
Electronic  
Electronic  
SubSystems  
Air Intake Subsystem  
Throttle Body Type  
SCPI  
Sequential Central  
Port Injection  
SCPI  
Sequential Central  
Port Injection  
Max Air Flow Rate:  
Intake manifold :  
Lower Intake:  
158@ 4600 rpm  
Symmetrical Runner Symmetrical Runner  
158@ 4600 rpm  
Gr/sec  
Aluminum  
Composite  
Aluminum  
Composite  
Upper Intake:  
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Contact:Luis Nespolo - (248) 857-1558  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
ENGINE  
L35  
L35  
Marine  
UNITS  
Truck Application  
Application  
Cylinder Head Subsystem  
Cylinder Head  
Material  
Cast-Iron  
GM232-M  
Cast-Iron  
GM232-M  
Cylinder Head Type:  
Valves Actuation:  
Rocker Arm Ratio  
Valve Train  
OHV  
Push Rod  
1.5:1  
OHV  
Push Rod  
1.5:1  
Valves per Cylinder:  
Valves Angle from Vertical:  
Lifters - Type  
Valve Guides  
Intake Valves  
Material  
Head Diameter  
Stem Diameter  
Length  
2
15  
2
15  
Degree  
Hydraulic Roller  
Cast Iron  
Hydraulic Roller  
Cast Iron  
1541 Steel  
49.3  
1541 Steel  
49.3  
mm  
mm  
mm  
7.965  
7.965  
123.68  
45 Degree  
11.2  
123.68  
45 Degree  
11.2  
Seats  
Lift  
mm  
Exhaust Valves  
Material  
21 - 4N  
Stainless Steel with  
21 - 4N  
Stainless Steel with  
3140 Welded Tip  
3140 Welded Tip  
38.1  
Head Diameter  
Stem Diameter  
Length  
Seats  
Lift  
38.1  
7.965  
124.84  
45 Degree  
11.0  
mm  
mm  
7.965  
124.84  
45 Degree  
11.0  
mm  
Main Block Subsystem  
Block Assembly:  
Material  
Cast-Iron  
GM232-M  
Cast-Iron  
GM232-M  
Cylinders  
Cast Iron  
Cast Iron  
Lower Structure  
Four main bearing  
Supports  
Four main bearing  
Supports  
Bore Spacing  
Deck Height  
Connecting rods:  
Material -  
111.76  
234.7  
111.76  
234.7  
mm  
mm  
Forged-SAE 1141  
Forged-SAE 1141  
Length -  
Bolts  
154.9  
9
154.9  
9
mm  
mm  
Bearings  
Aluminum Tin  
Silicon Alloy  
Aluminum Tin  
Silicon Alloy  
Rod Length to Stroke Ratio  
1.68:1  
1.68:1  
Piston  
Type -  
Strutless  
Flat Top  
Eutectic Cast  
Aluminum Alloy  
Strutless  
Flat Top  
Eutectic Cast  
Aluminum Alloy  
Cam Turned  
Gr  
Material -  
Weight  
437  
437  
File: c:\data\manuales\v6-truck\am43v6#3.doc  
Contact:Luis Nespolo - (248) 857-1558  
Printed: 8/15/00  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
ENGINE  
L35  
L35  
Marine  
UNITS  
Truck Application  
Application  
Piston Pins  
Type -  
Fixed 24X70  
Fixed 24X70  
mm  
Material -  
Steel SAE 1019  
Steel SAE 1019  
Piston Rings  
Compression Rings Number:  
Top Compression  
2
2
Steel Barrel  
1.5mm  
Steel Barrel  
1.5mm  
Second Compression  
Cast Iron  
1.5 mm  
Cast Iron  
1.5 mm  
Oil Control Rings Number -  
1
1
Type -  
Low Tension  
3 Pieces  
Low Tension  
3 Pieces  
Material -  
Camshaft  
Material -  
Plated Steel  
Plated Steel  
5150  
Steel Billet  
5150  
Steel Billet  
Description  
Gun Drilled  
39.4  
Gun Drilled  
39.4  
Base Circle Diameter:  
Drive Chain Pitch Roller  
Camshaft Valve Timing:  
Intake Valve........Opens  
Mm  
3/8  
3/8  
-33  
BTDC  
-33  
BTDC  
Crk Degree  
Crk Degree  
Crk Degree  
Crk Degree  
Closes  
286  
286  
ATDC  
ATDC  
Exhaust Valve.....Opens  
Closes  
-271  
BTDC  
-271  
BTDC  
48  
TDC  
48  
TDC  
Camshaft Bearings  
Steel Backed  
Copper/Lead  
Steel Backed  
Copper/Lead  
Valve Springs  
Material  
Super Clean  
Cr-Si  
Super Clean  
Cr-Si  
Type  
Double Shot  
Peened  
Double Shot  
Peened  
Dimension  
4.6 mm  
Round  
4.6 mm  
Round  
Closed (Valve Closed)  
Open (Rate)  
356  
65  
356  
65  
Newtons  
Newtons/mm  
Crankshaft  
Material -  
Cast Nodular  
Cast Nodular  
Undercut Rolled Fillet Undercut Rolled Fillet  
Number of Counterweights  
Main Journal Diameter -  
Crank Pin Journal Diameter  
Bearings  
6
6
62.2  
57.1  
62.2  
57.1  
Mm  
Mm  
Aluminum Tin  
Silicon Alloy  
Aluminum Tin  
Silicon Alloy  
Torsional Damper  
Ring Inertia  
Ring Inertia  
Rubber Mounted  
Crankcase Ventilation  
Negative Closed  
Negative Closed  
(Vacuum created from (Vacuum created from  
Intake Manifold)  
Intake Manifold)  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
ENGINE  
L35  
L35  
Marine  
UNITS  
Truck Application  
Application  
Balance Shaft  
Type  
Material  
Rotation  
Speed  
First Order  
Nodular Cast  
CCW  
First Order  
Nodular Cast  
CCW  
Same as Crank.  
Same as Crank.  
Drive  
Helical Gear 14 °  
Off Cam  
Helical Gear 14 °  
Off Cam  
Oil Lubrication  
Main and Rod Bearings  
Camshaft  
Pressure  
Pressure  
Splash  
Pressure  
Pressure  
Splash  
Splash  
Hollow  
Push Rod  
Pressure  
Pressure  
Splash  
Pressure  
Pressure  
Splash  
Splash  
Hollow  
Push Rod  
N/a  
N/a  
N/a  
N/a  
N/a  
N/a  
N/a  
N/a  
Timing Gear  
Connecting Rods  
Valve Mechanism  
Cylinder Walls  
Piston & Pins  
Cylinder Head  
Oil Capacity  
Oil  
5W-30W  
Mineral  
5W-30W  
Mineral  
N/a  
W/ Filter  
W/o Filter  
Oil Filter  
Type  
4.5  
4.0  
4.5  
4.0  
Qts  
Qts  
Full Flow  
PF-47  
Full Flow  
PF-47  
N/a  
Qts  
Capacity  
0.3  
0.3  
Oil Pump  
Type  
Spur Gear  
40-45 psi  
20-25 psi  
2
Spur Gear  
40-45 psi  
20-25 psi  
2
N/a  
@ 2000 RPM  
@ Idle  
Normal Pressure  
Idle Pressure  
Oil Flow @ 1000 RPM  
Drive  
GPM  
N/a  
Camshaft  
Camshaft  
Fuel Injection System  
Mean Features  
Injection Pump Make  
Type  
Delphi  
Top Feed  
SCFI  
Delphi  
Top Feed  
SCFI  
Model  
Injection Timing  
Operating Pressure  
Opening Pressure  
Fuel Pump  
Sequential  
425 +/- 9  
285 +/- 9  
Sequential  
425 +/- 9  
285 +/- 9  
KPa  
KPa  
Fuel Pump Make  
Type  
Delphi  
44MM -G-Rotor  
25  
Delphi  
44MM –G-Rotor  
Minimum Fuel Flow  
Maximum Fuel Flow  
Fuel Pump Voltage Range  
Fuel Pump Pressure  
Fuel Filter  
25  
TBD  
6-12  
425  
Gram/Sec  
Gram/Sec  
Volts  
TBD  
6-12  
425  
Delphi  
Kpa  
Delphi  
Type  
Full  
Recirculation  
Full  
Recirculation  
Material  
Nylon 66  
Nylon 66  
File: c:\data\manuales\v6-truck\am43v6#3.doc  
Contact:Luis Nespolo - (248) 857-1558  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
ENGINE  
L35  
L35  
Marine  
UNITS  
Truck Application  
Application  
Regulator  
Delphi  
Cartridge  
Delphi  
Cartridge  
Nominal Pressure  
Injectors  
Recommended Fuel  
Water Pump Type:  
Water Pump Maximum Flow @ Engine RPM:  
425  
Delphi  
87  
Centrifugal  
76.5  
425  
Delphi  
87  
Centrifugal  
76.5  
Kpa  
Octane = (R+M)/2  
GPM @ 4600  
RPM  
Maximum Sustained Coolant Temperature:  
Thermostat Setting  
262  
262  
F
Starts to Open  
Full Open  
180  
262  
180  
262  
F
F
Bearing Type  
Impeller Material  
Housing Material  
By Pass Recirculation Type  
Water Jackets full length of Cylinder  
Water Jackets all around Cylinder  
Water Jackets open at head face  
Surge Tank System  
Ball/Roller  
Cast iron  
Cast iron  
External  
Yes  
Ball/Roller  
Cast iron  
Cast iron  
External  
Yes  
Yes  
No  
No  
Yes  
No  
No  
Coolant Fill LocationDeaeration Tank  
Circulation Thermostat Type  
- direction of rotation :  
Deaeration Tank  
Bypass  
CCW  
Bypass  
CCW  
1.25  
- drive ratio (relative to crankshaft)  
1.25  
2.3.2 Fuel Requirements  
The 4.3L V6 90 Degree Engine System meets the emissions standard established in the FMVS  
and EPA regulations with fuel quality in accordance with the API standards.  
The engine must operate on the following types of fuels:  
Unleaded Gasoline 87 (R+M)/2 (ASTM D4814),  
Unleaded Gasoline 87 (R+M)/2 with up 15 % MTBE (Methyl Tertiary-Butyl Ether),  
Canadian Gasoline 87 (R+M)/2 (CGSB 3.5-92) w/ MMT @ 18 mg/L manganese,  
Reformulated Gasoline,  
Premium Unleaded 91 (R+M)/2,  
Export Gasoline as low as 80 (R+M)/2,  
South American Gasoline with Peroxide contamination to 2.5%  
Methanol mixes with gasoline to 15 %,  
Ethanol mixes with gasoline to 25 %, Brazilian fuel system (SCPI) required.  
Leaded Gasoline. Special cylinder heads required- NM8  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
2 . 3 . 2 Performance  
2.3.2.1 Engine Power & Torque  
The performance of the 4.3L V6 Engine is specified in the following paragraphs.  
The Fig 2.3.2.1-I shows the following performance characteristics for the L35 engine: Power,  
Torque and Speed Range.  
The engine will deliver the power and torque levels within +/-5% (after run in) as shown in  
Table 2.3.2-I.  
RPM  
Truck  
Applications  
Marine  
Applications  
Industrial  
Applications  
Notes  
Power  
HP  
Torque  
Lbs.-ft  
Power Torque Power  
Torque  
Lbs.-ft  
HP  
Lbs.-ft  
233.5  
248.6  
257.7  
260.2  
262.5  
269.1  
272.7  
274.1  
270.2  
259.5  
252.0  
242.3  
218.0  
HP  
N/A  
35  
800  
32.4  
50.7  
72.6  
93.8  
116.3  
137.9  
157.5  
174.7  
188.5  
195.8  
198.1  
197.8  
192.3  
210.4  
221.9  
238.1  
246.1  
254.3  
258.2  
257.9  
254.4  
247.1  
233.0  
226  
35.7  
57.0  
N/A  
200  
210  
220  
230  
220  
210  
200  
190  
N/A  
N/A  
N/A  
N/A  
1200  
1600  
2000  
2400  
2800  
3200  
3600  
4000  
4400  
4600  
4800  
5200  
78.7  
60  
99.1  
80  
120.3  
143.4  
166.4  
188.2  
206.2  
217.6  
220.8  
221.6  
216.0  
105  
118  
120  
119  
118  
N/A  
N/A  
N/A  
N/A  
216.3  
194.2  
Fig 2.3.2.1 -I 4.3L V6 Engine Power & Torque  
Test Conditions for Truck Applications  
* Based on the following conditions (measured at maximum rated speed W.O.T):  
-Exhaust restriction 8.5” of Hg  
-Air Intake temperature 77° F  
-Intake restriction - 1” of Hg  
-SAE J1349  
Test Conditions for Marine & Industrial Applications  
* Based on the following conditions (measured at maximum rated speed W.O.T):  
-Exhaust restriction: 0 of Hg  
- Air Intake temperature: 77 ° F  
-Intake restriction - 1” of Hg  
-GMPT Test #20  
-This data reflects the Maximum values obtained with Different Intakes Manifolds & Fuel  
Systems  
2 . 4  
FEATURE LOCATION ILLUSTRATIONS  
Front, Rear, Rh and Lh views of the 4.3L V6 90 Degree are included here with its overall dimensions  
for preliminary packaging evaluations.  
File: c:\data\manuales\v6-truck\am43v6#3.doc  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
L35 Main Views  
L35 Front View  
L35 Rear View  
File: c:\data\manuales\v6-truck\am43v6#3.doc  
Contact:Luis Nespolo - (248) 857-1558  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
L35 RH Side View  
L35 LH Side View  
File: c:\data\manuales\v6-truck\am43v6#3.doc  
Contact:Luis Nespolo - (248) 857-1558  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
2 . 5  
CONFIGURATION AS SHIPPED  
2 . 5 . 1 Engine as Shipped  
Engine as shipped from the engine plant is to conform to a common state of dress as described  
below. The following components are installed at the engine plant:  
Harmonic balancer  
Direct drive accessories (not belt driven)  
Engine lift brackets  
Crankshaft sensor  
E.G.R. system  
Engine oil  
Engine oil dipstick and tube  
Exhaust manifold heat shields (As required)  
Heater hose nipples  
Manifold air pressure sensor  
Oil filter (except remote mounted)  
Water pump  
Exhaust manifold(s)  
Engine Fuel system  
Coolant temperature sensor/switch  
Oil pressure sensor/switch  
Transmission alignment dowels  
Flywheel and or Flexplate  
Crankcase ventilation system  
2 . 6  
IDENTIFICATION AND MARKING  
2.6.1 VIN Identification Labeling  
There are two places for the stamping of the V.I.N.: one is provided side by side on the left hand  
side of powertrain and the other is in rear face of cylinder case.  
2.6.2 Emissions Certification Labeling  
A vehicle emission control label that meets the format and content requirements of Federal  
Regulation 40 CRF 86.095-35 and CARB Regulation Title XIII California Code of Regulations  
Section 1965 shall be attached to the vehicle subsystem in the location required by the  
regulations above.  
Incomplete Vehicles manufactured in two or more stages shall meet the certification labeling  
requirements of the regulations above.  
Emissions Certification is not provided for Marine Industrial Applications.  
2.6.3 Engine Identification - Broadcast Codes  
The 4.3L V6 Engine has an identification number cast into the cylinder case front LH side.  
Also, an Engine Verification Label is applied to the rear of the left bank cylinder head. This is the  
single label location for passenger car engines. In addition to the LH rear head location, the  
truck engines have another identical label applied to the oil pan (near the bottom of the engine)  
on the right side.  
The labels show the following information:  
• First Two characters: 10 - Indicates an engine not a transmission.  
• Next 3 characters: Broadcast code (engine configuration which includes a cross reference to  
model year of build):  
- Model year (1st letter)  
characters: Julien Date of Build  
• Last 4 Characters: Sequence number of build on that date.  
Translated the engine verification number shown in the sample label below identifies an engine,  
broadcast code (XJB) (1999 5.3L Federal Auto), built at Romulus on February 10 , 1999;  
sequence number 1034.  
Example: * 10XJB W990411034*  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
2.6.3.1 Engine Option Description  
RPO  
L35  
M30/MT1  
M50/MG5  
K18  
Description  
4.3L V-6 Engine w/ SCPI  
Automatic Transmission  
Manual Transmission  
Air Injection (Electric pump)  
Engine Oil Cooler  
Notes  
KC4  
KL5  
NA1  
Gaseous Fuel Compatible  
Below 8500# GVW  
NA3  
NA4  
Emission System - Japan  
Above 8500# GVW  
NB6  
Emission System - Calif.  
Emission System - Calif. LEV  
Emission System - Calif. ULEV  
Emission System - Federal Tier 1  
Emission System - Clean Fuel Fleet  
Emission System - Federal N LEV  
Emission System - Leaded Fuel  
Leaded Fuel System Compatible  
Emission Override - Unleaded Fuel  
Traction Control  
Tier 1 (-K18 on CK Manuals)  
(+K18 on CK / -K18 on M/L)  
(-K18 on ML)  
NC1  
NC8  
NF2  
NF4  
NF7  
NM2  
NM8  
NN8  
NW7  
RHD  
S5I  
(-K18 on CK & P)  
(Export for ML & P)  
(Export for ST)  
(Export)  
Right Hand Drive  
Brazil Equipment  
W99  
TZ0  
ZK3  
Venezuela Equipment  
Mexican Equipment  
(Manual Transmission)  
(Vehicle only)  
G-Van Pull Ahead  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
2.6.3.2 Engine Broadcast Codes & Part Numbers  
Part  
Number  
TON  
ROM  
Broad  
Cast  
Vehicle  
Description  
Code  
12559672  
12559676  
12559673  
12559677  
X
X
X
X
AAA  
AAF  
AAB  
AAH  
CK  
CK  
CK  
CK  
L35+M30+NF2 (-K18)  
L35+M30+NC1 (+K18)  
L35+MG5+NF2 (-K18)  
L35+MG5+NC1 (+K18)  
12559680  
12559681  
12559682  
X
X
X
ABA  
ABB  
ABC  
G-LD  
G-HD  
G-LD  
L35+M30+NA1-K18  
L35+MT1+NA4 (-K18)  
L35+M30+NA1+NF4+K18  
12559684  
12559685  
X
ACA  
ACB  
ML  
ML  
L35+M30+NA3/NC1/NC8/NF2/NF4/  
NF7  
L35+M30+NM2  
X
12559687  
12559688  
X
X
ADA  
ADB  
P
P
L35+MT1+NF2-KL5  
L35+MT1+KL5+NF2  
12559691  
12559707  
12559692  
12559708  
12559701  
12559702  
X
X
X
X
X
X
X
X
AFC  
AFL  
AFD  
AFN  
AFJ  
AFK  
S
S
S
S
S
S
L35+M30-K18-NM8 (+NN8)  
L35+M30+NM8  
L35+M50-K18-NM8 (+NN8)  
L35+M50+NM8  
L35+M30+K18+NF4  
L35+M50+K18+NF4  
X
X
12559695  
12559696  
12559709  
12559710  
12560378  
12560379  
12559711  
12559705  
12559706  
X
X
X
X
X
X
X
X
X
X
X
AHC  
AHD  
AHP  
AHS  
AHX  
AHY  
AHT  
AHL  
AHN  
T
T
T
T
T
T
T
T
T
L35+M50-K18-NM8-RHD  
L35+M30-K18-NM8-RHD  
L35+M50+NM8-W99  
L35+M50+W99+NN8  
L35+M30+RHD-NM8-K18  
L35+M50+RHD-NM8-K18  
L35+M30+NM8  
X
X
L35+M30+NF4+K18  
L35+M50+NF4+K18  
12560483  
12560485  
12560484  
12560486  
12560481  
X
X
X
X
X
1LB  
1LJ  
1LC  
1LK  
1LT  
—-  
—-  
—-  
—-  
—-  
Marine (Volvo) 2Bbl w/Dist.  
Marine (Merc) 2Bbl w/o Dist.  
Marine 4Bbl w/ Dist.  
Marine 4Bbl w/o Dist.  
Indust 2Bbl Gaseous - Bucks  
Irrigation  
12560482  
X
1LX  
—-  
Indust 2Bbl Gas - Williams  
Powertrain  
12559712  
12559713  
X
X
1LA  
1LD  
T
T
L35+M50+S5I (Brazil)  
L35+M30+S5I (Brazil)  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
3.0 GMPT SYSTEM INTERFACES  
3.1 INTERNAL INTERFACES TO GMPT  
3.1.1 Engine Interface to transmission  
The transmission shall be attached to the rear end of the engine, which provided the flange face  
attachment illustrated in the figure 3.1.1- I.  
Figure 3.1.1-I: Transmission attachment  
3.1.1.1 Automatic Transmission  
The 4.3L V6 engine could be mated to either: the GM Automatic Transmission Hydra Matic  
4L60E or the GM Automatic Transmission Hydra Matic 4L80E  
Figure 3.2.1-I to 3.2.1-XVIII shows the PCM Engine to Automatic Transmission Mechanization  
Diagram.  
3.1.1.2 Manual Transmission and Clutch  
The GM Manual Transmission recommended is a Five Speed Manual (MW 3)  
The following engine-transmission, clutch interface issues must be considered:  
Manual transmissions require the engine crankshaft pilot bearing to be able to support up to 920  
lbs (4292 N) of radial load due to transmission internal gear forces.  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
The following table shows the different Transmissions and Components coupled to the L35 engine and  
GM platforms.  
Transmission  
( UPC: 7 )  
P-Truck  
C/K Truck  
G-Van  
M/L -Van  
S/T Truck  
Auto 4L80E MT1  
Bolt/Screw/Stud  
24210752  
N/A  
N/A  
24210754  
N/A  
N/A  
N/A  
N/A  
15724226  
11514224  
15724226  
11514224  
Auto 4L60E M30  
N/A  
24211665  
24211666  
24211667  
24211668  
24211663  
24211664  
24211662  
24211663  
Brace  
N/A  
N/A  
N/A  
N/A  
15992466  
N/A  
Bolt/Screw/Stud  
11515768  
15724226  
11515768  
15724226  
15724226  
11517000  
25624806  
11517000  
1261968  
Manual 5-Speed MW3  
15020892  
N/A  
15031131  
N/A  
N/A  
N/A  
Bolt/Screw/Stud  
11514224  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
Manual 5-Speed MG5  
15769087  
15769088  
Bolt/Screw/Stud  
N/A  
N/A  
11515768  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
Manual 5-Speed MW2  
15045050  
Bolt/Screw/Stud  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
11515768  
Manual 5-Speed M50  
15769696  
15769697  
15769698  
Bolt/Screw/Stud  
11517000  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
3.1.2 Engine Interface to PCM ( Vehicular and Marine/Industrial Application)  
The 4.3L V6 90 Degree Engine uses the Powertrain Control Unit (PCM) to control the engine,  
automatic transmission, the vehicle performance parameters and the onboard diagnostic system.  
3.1.2.1 Inputs from the Engine to the PCM  
The following Inputs are internal engine parameters and must be supplied to the Powertrain  
Control Module:  
Barometric Pressure (Or Manifold Absolute Pressure) - POA Engine Assembly  
Mass Airflow Sensor (Air Cleaner/Air Duct)  
Engine Speed  
Crankshaft Sensor and Camshaft Sensor  
Knock Sensor  
Air intake Temperature Sensor (POA MAF) - (Only for the GMT-800 Truck)  
Engine Coolant Temperature ECT Sensor-POA Engine Assembly  
Engine Oil Pressure Sensor  
3.1.2.2 Outputs from PCM to the Engine  
Fuel Injectors Management – (Injection Pulse Width Signal)  
Idle Air Control Motor (IACV)  
Ignition Control Coil Module  
Linear EGR Valve Solenoid  
Evap. System  
Purge Solenoid  
Secondary Air (AIR) System  
A/C Control  
Serial Data  
3.1.3 PCM Interface to Transmission  
The PCM uses an Electronic Transmission Control Algorithm to monitor and control the transmission.  
This algorithm is actually a combination of four algorithms, these algorithms monitor and control  
the various aspects of the transmission shifting.  
3.1.3.1 Input Algorithm:  
The Input Algorithm samples all external sensors and scale these values.  
3.1.3.2 Shift Control Algorithm:  
The Shift Control Algorithm determines which gear ratio the transmission is currently in and  
changes the state of the control solenoid to accomplish a shift.  
The shift pattern is controlled by a set of tables. These contain the vehicle speed at which the  
shift is to occur as a function of throttle position.  
In the manual mode, the current gear may be determined by the operator’s movement of the  
gearshift selector lever.  
3.1.3.3 Shift Quality Algorithm:  
The Shift Quality Algorithm determines shift quality (or firmness).  
This is accomplished by controlling the pressure control solenoid, which regulates the torque  
signal modulation pressure.  
This pressure is determined by a table that is based on vehicle speed and Throttle position.  
Garage Shift quality (shifting from Park or Neutral to Drive or Reverse when the vehicle is  
stationary) is also controlled by torque signal pressure.  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
3.1.3.4 TCC Control Algorithm  
The TCC algorithm determines when the torque converter clutch is applied or released, using  
a set of tables. These tables also determine and control the rate of application and release of  
the TCC based on Throttle position  
3.1.3.5 Inputs from Transmission to PCM  
The following are external Inputs coming from the Transmission to the PCM:  
Transmission Speed Sensor  
Transmission Fluid Temperature Sensor  
Transmission Range Pressure Sensor  
3.1.3.6 Output to the Transmission from PCM  
TCC Solenoid  
Transmission Shift solenoids  
Pressure Control Solenoid  
3.1.4 PCM Interface to Vehicle  
3.1.4.1 External Inputs of the Engine  
The following are external Inputs coming from the vehicle to the PCM:  
A/C Status  
Ignition Voltage  
Serial Data (Diagnostics)  
Brake/ Clutch Status  
4WD Lo Switch (If Applicable)  
Diagnostic Enable  
Cruise Control Inputs  
Tow/Haul Input Switch  
3.1.4.2 Output to the Vehicle:  
Data link Connector  
MIL “Service Engine Soon” Lamp  
“Service Throttle Soon” (STS) Lamp  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
3.1.5a PCM Pin Out and Pin In – Truck Applications  
See Figure 3.1.5 - I Powertrain Control Module Diagram to reference the following pin out and  
pin in connector information  
Figure : 3.1.5a - I PCM Pin Out /In Connector C1  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
Figure : 3.1.5a -II PCM Pin Out /In Connector C2  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
The following table shows the different PCM ASM and Components coupled to the L35 engine per GM  
platforms.  
PCM  
( 12 F )  
P-Truck  
C/K Truck  
G-Van  
M/L -Van  
S/T Truck  
Module ASM  
9368071  
12201281  
12201281  
52370668  
12201281  
12201281  
Housing Extension  
Bracket  
15003789  
15005865  
15714426  
15047570  
11516568  
15766026  
15047570  
11516568  
15767011  
11516568  
Bolt/Screw/Nut  
3846202  
11514139  
11514519  
11514006  
Sensors  
( 12 F )  
P-Truck  
C/K Truck  
G-Van  
M/L -Van  
S/T Truck  
Oxygen Sensor  
25312191  
25312201  
25312191  
25314006  
25312191  
25314006  
25312191  
25314006  
25312191  
25314006  
Mass Air Flow Sensor  
25168491 Include in Air Include in Air Include in Air Include in Air  
SubSystem SubSystem SubSystem SubSystem  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
3.1.5b PCM Pin Out and Pin In – Marine and Industrial Applications  
Marine Applications use a different control module : MEFI – 4 Multiport Electronic Fuel Injection.  
Interfaces as those described for vehicles application, OBD II, and Emissions requirement are  
not longer needed.  
Table A.1 shows the connector pin out for MEFI Electronic Control Module (ECM) Part Number  
12569494 Rev B.  
Table A.1 – Pinout  
PIN  
MEFI4 PIN NAME  
PIN  
MEFI4 PIN NAME  
J1-1  
KNOCK2  
J2-1  
BATT  
J1-2  
DIAG*_BOOT  
MASTER  
J2-2  
V5B  
J1-3  
J2-3  
V5BRTN  
FUELPRESS  
EGRFB  
O2AHI  
J1-4  
GW2/GOVMOD  
ESTOP  
J2-4  
J1-5  
J2-5  
J1-6  
FPR  
J2-6  
J1-7  
RPMCHG  
J2-7  
CLT  
J1-8  
BUZZER  
J2-8  
MAP  
J1-9  
CKGAGE/GOVOVS  
VR_REFLO  
INJB  
J2-9  
CANLO  
SDATA  
TACDATA2  
ESTH  
J1-10  
J1-11  
J1-12  
J1-13  
J1-14  
J1-15  
J1-16  
J1-17  
J1-18  
J1-19  
J1-20  
J1-21  
J1-22  
J1-23  
J1-24  
J1-25  
J1-26  
J1-27  
J1-28  
J1-29  
J1-30  
J1-31  
J1-32  
J2-10  
J2-11  
J2-12  
J2-13  
J2-14  
J2-15  
J2-16  
J2-17  
J2-18  
J2-19  
J2-20  
J2-21  
J2-22  
J2-23  
J2-24  
J2-25  
J2-26  
J2-27  
J2-28  
J2-29  
J2-30  
J2-31  
J2-32  
EGR  
GND3  
ESTF  
TACH  
ESTD  
IACBLO  
ESTB_BYP*  
REF  
IACAHI  
KNOCK1  
DEPSPWR  
DEPSLO  
IGN  
OILLEV  
GW1/FCAL  
LOAD1/LOCKLO/SHIFTINT  
LOAD2/TWINSYNC/TROLL  
GW1LMP/TRAN/CNP  
GW2LMP/TROLLMP/GOV  
OILLEVLMP  
VR_REFHI  
INJA  
OILPRESS  
MAT  
O2BHI  
TPS  
CANHI  
VSSVF  
VSS_AN/FTEMP  
TACDATA1  
ESTG  
CE  
GND1  
GND2  
ESTE  
IACBHI  
ESTC  
IACALO  
ESTA  
FPRSENSE  
CAM  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
3.1.6 Engine interface to exhaust  
3.1.6.1 Content  
The engine is provided with exhaust manifolds for vehicles and Industrial Applications.  
The exhaust manifold system includes the manifold, fasteners to the cylinder head, and  
partial or full cover type heat shield. The exhaust manifold may also incorporate provisions  
for EGR attachment.  
Vehicle Exhaust System  
The 4.3L V6 90 Degree Engine shall be attached to the vehicle and interface with the  
Vehicle Exhaust System.  
The Vehicle Exhaust System will be designed or adapted considering the following Issues:  
Vehicle Exhaust System Back pressure: All performance parameters specified in paragraph:  
2.3.2.1 were measured with a maximum exhaust restriction of 8.5” of Hg.  
Thermal Management of Exhaust  
Thermal management of exhaust  
The following issues must be considered:  
a. Location of Catalytic Converter: The location of the catalytic converter is determined by  
resolving three competing needs. The first need is to locate the converter such that it is  
close enough to the engine so that sufficient heat is transferred to the converter via the  
exhaust stream so as to initiate catalytic activity and therefore constituent conversion  
soon enough to meet emission requirements. The second need is to locate the catalytic  
converter far enough downstream from the engine in the vehicle’s exhaust system so that  
the converter will not be damaged during extended duration high exhaust gas stream  
temperature excursions resulting from high speed and load operation of the engine. The  
third need is to locate the converter in a position in the chassis where it will package with  
sufficient clearance to surrounding components or systems to prevent heat related  
failures in those systems or components.  
b. Location of Oxygen Sensor(s)  
All OBD II compliant exhaust systems contain enough oxygen sensors to guarantee  
proper monitoring of the exhaust gases. Each engine cylinder bank requires an oxygen  
sensor for air/fuel ratio control. An oxygen sensor is required behind each catalytic  
converter for diagnosis purposes. Post converter oxygen sensors are also implied for  
slow air/fuel ratio trim. Oxygen sensor wiring connections must be located to as to avoid  
moisture contamination.  
c. Converter Volume and Flow  
d. Location of muffler  
e Vibration/shock of catalytic converter  
f. Material life for exhaust system through catalytic converter  
g. Thermal Characteristics  
h. Exhaust Leakage  
The exhaust system must be leak free for the emission useful life of the vehicle.  
In order to have a working definition of leak free, the exhaust system is divided into three  
zones:  
Zone A (A/F Control)  
Cylinder head / exhaust manifold interface to  
control oxygen sensor  
Zone B (Converter Feedstream)  
Zone C (Diagnostic Feedstream)  
Control oxygen sensor to converter  
Converter to 12 inches downstream of the  
diagnostic oxygen sensor  
Maximum allowable leakage in each zone is 2 liters/minute at 15 kPa.  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
The following table shows the different Exhaust Assemblies and Components coupled to the L35 engine  
per GM platforms.  
Exhaust  
( 8 C )  
P-Truck  
C/K Truck  
G-Van  
M/L -Van S/T Truck  
Manifold ASM  
15986438  
15029769  
15029769  
15029769 15029769  
Pipe ASM Exhaust  
15045399  
15034810  
15743099  
15749444 15744824  
15744826  
15744828/9  
Manifold Seal  
Manifold Gasket  
Shield  
12555091  
15997189  
15035747  
15035748  
11514597  
15997189  
15027911  
15997953  
12555091 12555091  
15997189 15997189  
15027911 15736668  
15997189  
15767098  
15753676  
Screw/Bolt/Nut  
11514597  
15733192  
15733192  
15032594  
15023752 15023752  
11514597 11514597  
Converter ASM  
25160620  
15986441  
15052911  
15756278  
15159709  
15160977  
15700838  
15747730  
15744810 15744810  
15749445 15749445  
12568312  
Converter Pipe ASM  
15986425  
15986425  
15986428  
15709444  
15709444  
N/A  
N/A  
Converter Gasket  
Shield  
15027074  
15027074  
TBD  
15027074  
15027074 15027074  
15739194  
1507912  
15739194  
1507912  
15027095  
15150934  
TBD  
Clamp  
15529483  
15529483  
15529483  
15529483 15529483  
Screw/Bolt/Nut  
15709703  
9442939  
15709703  
15997953  
11517501  
15709703  
15997953  
11517501  
15709703 15709703  
15997953 15997953  
11517501 11517501  
Muffler ASM  
15727690  
15727691  
15739195  
15040396  
15040397  
15061814  
15008799  
15159716  
15761545  
15756876 15756876  
15756877 15756877  
Exhaust Pipe ASM  
15756780  
15739879  
N/A  
15156883/4  
15156936/5  
Shield  
15739195  
15990607 15990607  
Hanger/Bracket  
15986421  
15986422  
15986421  
15986422  
15986421  
15986422  
15152715 15023065/6  
15976360  
15976332  
Clamp  
15595047  
15529483  
15595047  
15529483  
15595047  
15529483  
15595047 15595047  
15529483 15529483  
Screw/Bolt/Nut  
11515799  
11515216  
9424320  
11515799  
11515216  
9424320  
11515799  
11515216  
9424320  
11500831 11500831  
11515768 11515768  
15695050  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
3.1.6.2 Back Pressure  
Exhaust back pressure shall not exceed 8.5 inches of Hg at rated speed and load. Lower  
exhaust back pressure is desired from a performance and fuel economy standpoint.  
3.1.6.3 Packaging  
The vehicle assembly plant attaches the exhaust pipe to the manifold with the proper  
fasteners and a gasket or seal. Exhaust manifold takedowns will be 2 or 3 fastener designs.  
Consult GM application engineer.  
The current exhaust manifolds are made from Nodular Iron with incorporated and  
detachable heat shields.  
Fasteners at the manifold takedown must be capable of withstanding temperatures up to  
800°C and will require stainless steel or sermagard coated steel. The gasket/seal must also  
withstand these temperatures and will require stainless steel or stainless steel with mica or  
grafoil.  
The heat shield provided on the exhaust manifold will reduce radiant heat to nearby critical  
components and reduce or minimize the number of separate shields required by the vehicle.  
3.1.6.4 Exhaust Gas Recirculation (EGR)  
EGR  
P-Truck C/K Truck  
G-Van  
M/L -Van S/T Truck  
( 6 L 3 )  
EGR ASM Valve  
17200268 17200268 17200268 17200268 17200268  
3.1.6.5 Secondary Air  
GMPT will indicate the needs for secondary air recirculation.  
The following table shows the different Secondary Air and EGR Assemblies and  
Components coupled to the L35 engine per GM platforms.  
Engine Secondary Air  
( 6T )  
P-Truck  
C/K Truck  
G-Van  
M/L -Van S/T Truck  
Pump Air Inj ASM  
Hose ASM  
15059238 15053709  
15056764  
15023825  
15760279  
15022544  
15022570  
20513798  
N/A  
N/A  
N/A  
Hose ASM By Pass  
Stud  
Washer  
15953691  
11509086  
11508706  
12561250/51  
15037955  
15056713  
Strap  
Bolt Screw  
Pipe ASM  
12561825 12562572  
12567731 12567745  
12567732 12567746  
12558020 11515210  
Check Valve (or Bypass)  
Check Valve (or Bypass)  
Bolt Screw  
15695050  
9440034  
Gasket  
Shield  
Nut  
12561871 12561871  
12561871  
15026631  
11514596  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
3.1.7 Engine Interface to Cruise Control  
Figure 3.2.1-I to 3.2.1-XVIII shows the PCM Engine to Vehicle Mechanization Diagram with this  
interface. The following table shows the different Cruise Control Modules and Components used  
with the L35 engine and GM platforms.  
Cruise Control  
( 6 N 4 )  
P-Truck  
C/K Truck  
G-Van  
M/L -Van  
S/T Truck  
Cruise Control Module  
25315559  
25315559  
25315090  
25315087  
15028014  
15717608  
25315088  
Cable  
15040802  
15040801  
11517009  
11518009  
15040802  
15040801  
11517009  
11518009  
15031096  
15045430  
11515928  
15045460  
15751730  
11508010  
11517507  
15685170  
Bolt/Screw  
15685170  
15983425  
15685170  
3.1.8 Accelerator Pedal  
Figure 3.2.1-I to 3.2.1-XVIII shows the PCM Engine to Vehicle Mechanization Diagram with this  
interface. The following table shows the different Pedal Accelerator Assemblies and  
Components used with the L35 engine and GM platforms.  
Pedal Accelerator  
( 6 N 2 )  
P-Truck  
C/K Truck  
G-Van  
M/L -Van  
S/T Truck  
Pedal Accelerator ASM  
15944514  
15944514  
15160381  
15756441  
15756441  
15015757  
15716466  
15729139  
Cable  
15148661  
15148662  
9433298  
15038820  
11514516  
15031093  
15741073  
11514516  
11516150  
11517519  
15031093  
15153422  
15010419  
Bolt/ Screw  
15010419  
3.1.9 Engine to Evaporative Fuel System  
Figure 3.2.1-I to 3.2.1-XVIII shows the PCM Engine to Vehicle Mechanization Diagram with this  
interface. The following table shows the different Fuel Lines, Fuel Tank and Evaporative  
Assemblies and Components coupled to the L35 engine per GM platforms.  
Fuel Evaporative  
( 8 D )  
P-Truck  
C/K Truck  
G-Van  
M/L -Van  
S/T Truck  
Canister ASM  
17098106  
15056485  
17098085  
17098085  
17201171  
17097127  
17097120  
Shield  
Hose  
15004076  
10282447  
15721451  
15733597  
15721447  
15721448  
15731510  
15759042  
15759043  
N/A  
15012787  
9439150  
15150414  
15726983  
15768562  
Clamp  
10108259  
11516221  
10108259  
11516221  
N/A  
10108259  
11516221  
10108259  
11516221  
Separator  
Bracket  
17096210  
N/A  
15032645  
15032646  
15769694  
15032645  
15032645  
15032646  
15032646  
15009801  
15013689  
15746404  
17565062  
15731699  
12556909  
15056490  
15769694  
15049107  
15742240  
15734230  
15992101  
Harness  
12555973  
11509087  
15032643  
15032644  
12561900  
15000499  
15032643  
15032644  
12561900  
11509087  
12566190  
11509087  
25658328  
12559015  
Strap  
Valve  
11509087  
12559015  
11509087  
15759225  
Bolt/Screw/Nut  
11508797  
3847758  
3975550  
11515211  
11516573  
11513914  
11515211  
11508797  
3847758  
3975550  
11515211  
11508797  
11515654  
11515656  
11515658  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
3.1.10 Accessory Drive System  
The engine is released with an accessory drive system whose components are dimensioned  
and released as indicated in the paragraphs 3.1.11 to 3.1.16.  
The maximum torque from the front crankshaft pulley is 150 ft lb., regardless of the engine  
speed; so it is recommended that the Belt System Drive maximum Torque requirement not to  
exceed 140 ft lb.  
For torque values above 140 ft. lb. the customer shall provide different PTO assembly.  
3.1.11 Standard Accessory Descriptions  
GMPT accessory drive design release engineer will provide attachment points and drive of these  
components on the engine.  
The following table 3.1.11-I shows the different combinations of components coupled to the L35  
engine accessory drive brackets per GM platforms.  
3.1.12 Cooling Fan  
Cooling Fan assembly is not part of the engine scope or extent of supply.  
Cooling fan is designed, dimensioned and released by the GM - HVAC engineering group taking  
in consideration the Heat Rejection (indicated in the paragraph 3.4.5) needed to evacuate from  
the engine through the radiator assembly.  
If the Fan is driven from the crankshaft front pulley and the maximum torque values specified in  
paragraph 3.1.10 shall be taken in consideration.  
3.1.13 Alternator  
Alternator is not part of the engine scope or extent of supply.  
Alternator is designed, dimensioned and released by the GM - Electrical engineering group  
taking in consideration all vehicles electrical power needs.  
If the alternator is driven from the crankshaft front pulley and the maximum torque values  
specified in paragraph 3.1.10 shall be taken in consideration.  
3.1.14 Power Steering Pump  
Power Steering Pump is not part of the engine scope or extent of supply.  
Power Steering Pump is designed, dimensioned and released by the GM - Chassis engineering  
group taking in consideration the vehicles drive needs.  
If the power steering pump is driven from the crankshaft front pulley and the maximum torque  
values specified in paragraph 3.1.10 shall be taken in consideration.  
3.1.15 AC Compressor  
AC Compressor assembly is not part of the engine scope or extent of supply.  
AC Compressor is designed, dimensioned and released by the GM - HVAC engineering group  
taking in consideration the Vehicle Air Conditioned needs.  
AC Compressor is driven from the crankshaft front pulley and the maximum torque values  
specified in paragraph 3.1.10 shall be taken in consideration.  
3.1.16 Crank Shaft Nose Load  
Crankshaft maximum load at the nose will not exceed 140 Lbs.  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
The application engineer can provide information above accessory bracket assemblies available for  
various engine applications.  
MY-2001  
P-Truck  
MY-2001  
MY-2001  
G-Van  
MY-2001  
M/L -Van  
MY-2001  
Steering Pump System  
( 9E )  
C/K Truck  
S/T Truck  
Steering Pump  
26042592  
15772602  
26068923  
26070078  
26070099  
26057292  
26058060  
26081015  
15754215/16  
Steering Pump Pulley  
Steering Pump Bracket RR  
Steering Pump Reservoir  
Steering Pump Cooler  
Steering Pump Hose  
Steering Pump Hose  
Steering Pump Hose  
Steering Pump Strap  
Steering Pump Pipe  
Steering Pump Clamp  
Steering Pump Bracket Nut  
Steering Pump Stud  
Steering Pump Nut  
10085755  
10236998  
15682455  
26063303/5  
3931898  
10085755  
10236998  
N/A  
26063303/5  
26051184  
26068830  
N/A  
10085755  
10236998  
26073040/1  
26063303/5  
26040765  
26063303  
N/A  
10085755  
N/A  
26057780  
N/A  
10085755  
10236998  
N/A  
N/A  
26057733  
26063303  
26055306  
11509086  
26050743  
15735493  
10242827  
10224557  
10242827  
11516349  
10244168  
11517950  
52476687  
M/L -Van  
26057936  
26042259  
26055306  
11509086  
15159570  
22514443  
10242827  
10224557  
10242827  
11516349  
10244168  
11515586  
52476687  
S/T Truck  
3773687  
3786228  
11501907  
15983287  
11516255  
10242827  
10224557  
10242827  
11516349  
10244162  
11517950  
52476687  
P-Truck  
N/A  
N/A  
26051176  
11516255  
10242827  
10224557  
10242827  
11516349  
10244168  
11517950  
52476687  
C/K Truck  
26051176  
11516223  
10242827  
10224557  
10242827  
11516349  
10244168  
11517950  
52476687  
G-Van  
Steering Pump Bolt  
Steering Pump Bolt  
Steering Pump Bolt  
Steering Pump Bolt  
HVAC Compressor ASM  
( 1A 2G )  
Compressor  
Brace  
1136580  
N/A  
15766590  
N/A  
15766591  
N/A  
15765192  
12555015  
11516285  
11516246  
10157953  
U101  
15765201/2  
N/A  
Bolt Screw  
Bolt Screw  
Bolt Screw  
Engineer  
11516285  
N/A  
N/A  
WE08  
12554522  
11516285  
11516704  
N/A  
XS03-U101  
12554522  
11516285  
N/A  
N/A  
0AHD  
11516285  
N/A  
N/A  
0UR1-U101  
12554522  
Bracket HVAC ASM ( 9E )  
12554522  
12554522  
Generator ASM  
( 6Y1 )  
P-Truck  
C/K Truck  
G-Van  
M/L -Van  
S/T Truck  
Alternator  
10480270/1  
11516704  
11516283  
10244168  
10242827  
10224557  
10237271  
11516284  
10480388/90 15768829/30  
10480326  
11516285  
11516283  
10244168  
10242827  
10224557  
N/A  
10480288  
11516285  
11516283  
10244168  
10242827  
10224557  
N/A  
Screw/Bolt Alternator  
Screw/Bolt Alternator  
Screw/Bolt Tensioner  
Nut Tensioner  
Stud Tensioner  
Generator Bracket Rr  
Screw/Bolt Bracket Rr  
Bolt Screw  
11516704  
11516283  
10244168  
10242827  
10224557  
N/A  
11516285  
11516283  
10244168  
10242827  
10224557  
N/A  
N/A  
N/A  
N/A  
N/A  
Bolt Screw  
Engineer  
WE08  
UT06  
OAKQ  
UQ12  
UT06  
Bracket ASM  
10236997  
10236997  
10236997  
10236997  
10236997  
Table 3.1.11-I Accessory Drive Brackets Components Combination  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
3.2 INTERFACES WITH VEHICLE SUBSYSTEMS  
3.2.1a GMPT interface with Electrical Supply System-Truck Application  
Battery  
Type  
Description  
Model  
78A-72  
Voltage  
12  
Amps ( Minimum )  
Minutes Reserve Capacity  
Amps/hrs.-20 hr. rate  
Type  
Rating (idle/max. rpm)  
Ratio (alt. crank/rev)  
Volt Nominal Output  
Type  
Electronic  
Type  
High Energy Single Coil  
Type  
AC 41-931-Dual Pad Platinum  
600  
115  
69  
Description  
50 / 120 Amps  
2.52:1  
Alternator  
12 volts  
Regulator  
Description  
Integral to alternator  
Description  
Electronic Distributor  
Description  
Gap 1.5mm  
Electric Ignition  
Spark Plug  
See Table 3.1.11-I Accessory Drive Brackets Components Combination for Generator usage  
information.  
The following table shows the different Harnesses and components used with the L35 engine  
per GM platforms.  
Electrical  
( 12 H )  
P-Truck  
C/K Truck  
G-Van  
M/L -Van  
S/T Truck  
Harness ASM  
15323118  
15301067  
15301068  
12153424  
12153346  
15301097  
15311589  
15323111  
15323112  
12172550  
12172551  
12172552  
12172553  
15059848  
15059849  
15059850  
15059851  
15059852  
15059853  
15059854  
15059855  
15059856  
15059857  
15059858  
15045564  
15045565  
15045566  
15062567  
15062568  
15062569  
15062570  
15763497  
15328570  
15328572  
15328574  
15328576  
15328577  
15328578  
15365302  
15365303  
15365306  
15365307  
15770834  
Harness Extension  
Bracket  
15323114  
15323164  
15323165  
15969147  
15328807  
15038561  
15709061  
15319959  
15350451  
15709061  
15319959  
15350451  
N/A  
15985078  
15002035  
15708423  
15023004  
15985076  
11501907  
11509087  
15517469  
15990187  
15033674  
15738436  
15993897  
15733696  
15999051  
15741029  
Strap  
11501907  
11509087  
15517469  
11501907  
11509087  
15517469  
11501900  
11501900  
11509086  
Bolt/Screw/Nut  
3975550  
566314  
9440963  
9440034  
11509572  
11516587  
15714906  
11516793  
15709062  
15735328  
11516587  
15714906  
11516793  
15709062  
15735328  
9419301  
11516567  
15994522  
11503740  
11515971  
9440034  
11500815  
15961952  
11506117  
15961953  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
Figure 3.2.1-I to 3.2.1-XVI shows the PCM Engine to Vehicle Mechanization Diagram for the P-  
Truck platform application.  
Figure Number  
Description  
Figure 3.2.1 - I  
Cooling, MAP, TPS and OIL Sensors  
Figure 3.2.1a – II  
Figure 3.2.1a - III  
Figure 3.2.1a - IV  
Figure 3.2.1a - V  
Figure 3.2.1a - VI  
Figure 3.2.1a - VII  
Figure 3.2.1a - VIII  
Figure 3.2.1a - IX  
Figure 3.2.1a - X  
Figure 3.2.1a - XI  
Figure 3.2.1a - XII  
Figure 3.2.1a - XIII  
Figure 3.2.1a - XIV  
Figure 3.2.1a - XV  
Figure 3.2.1a - XVI  
EGR, Purge & Vent Solenoid Fuel Canister  
VSS (TISS & TOSS), Air Pump & Solenoid Relay  
Engine to Transmission (Auto & Manual)  
Engine Injectors  
TCC Switch & Cruise Control  
Starter, Alternator & IP Gages  
Brake, ABS Switch, Serial Data Link I/P Cluster & Cruise Module  
Oxygen Sensors  
Idle Air Controller & Knock Sensor  
Fuel System and Optional ETC  
Engine Ignition System  
Engine Crank & Cam Sensors  
HVAC  
Power Distribution  
Note & references  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
Figure 3.2.1a - I - P/Truck - Mechanization Diagram – Cooling, MAP, TPS and OIL Sensors  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
Figure 3.2.1a – II – P/Truck - Mechanization Diagram – EGR, Purge & Vent Solenoid Fuel Canister  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
Figure 3.2.1a - III - P/Truck - Mechanization Diagram-VSS (TISS & TOSS), Air Pump & Solenoid Relay  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
Figure 3.2.1a - IV - P/Truck - Mechanization Diagram – Engine to Transmission (Auto & Manual)  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
Figure 3.2.1a - V - P/Truck - Mechanization Diagram – Engine Injectors  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
Figure 3.2.1a - VI - P/Truck - Mechanization Diagram – TCC Switch & Cruise Control  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
Figure 3.2.1a - VII - P/Truck - Mechanization Diagram – Starter, Alternator & IP Gages  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
Figure 3.2.1a - VIII - P/Truck - Mechanization Diagram –  
Brake, ABS Switch, Serial Data Link I/P Cluster & Cruise Module  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
Figure 3.2.1a - IX - P/Truck - Mechanization Diagram – Oxygen Sensors  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
Figure 3.2.1a - X - P/Truck - Mechanization Diagram – Idle Air Controller & Knock Sensor  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
Figure 3.2.1a - XI - P/Truck - Mechanization Diagram – Fuel System and Optional ETC  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
Figure 3.2.1a - XII - P/Truck - Mechanization Diagram – Engine Ignition System  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
Figure 3.2.1a - XIII - P/Truck - Mechanization Diagram – Engine Crank & Cam Sensors  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
Figure 3.2.1a - XIV - P/Truck - Mechanization Diagram – HVAC  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
Figure 3.2.1a - XV - P/Truck - Mechanization Diagram – Power Distribution  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
Figure 3.2.1a - XVI - P/Truck - Mechanization Diagram – Note & references  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
3.2.1b GMPT interface with Electrical Supply System- Marine and Industrial Application  
Figure 3.2.1b-I to 3.2.1b-II shows the PCM Engine to Vehicle Mechanization Diagram for the  
Marine and Industrial Applications  
Figure Number  
Figure 3.2.1b - I  
Figure 3.2.1b – II  
Description  
Cam, Crank, MAP,TPS and OIL Sensors  
Engine Injectors, Spark Plugs  
Figure 3.2.1b - I - Mechanization Diagram – Cam, Crank, MAP, TPS and OIL Sensors  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
Figure 3.2.1b – II - Mechanization Diagram – Engine Injectors, Spark Plugs  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
3.2.2 GMPT interface with Electrical Starting System  
L35  
Motor  
PG260  
Current Drain  
312 Amps  
Power Rating Kw  
Engagement Type  
1.4Kw  
Motor Drive  
Solenoid Actuated  
Positive Engagement  
Gear Reduction Type  
Pinion Engages From:  
Front  
The following table shows the different Starters and Components coupled to the L35 engine and  
GM platforms.  
Engine Starter  
( 6 Y 2 )  
P-Truck C/K Truck  
G-Van  
M/L -Van S/T Truck  
Starter ASM  
12563829 12564107 12564107 12564107 12564107  
12561327 12561327 12561327 12561327 12561327  
Shield  
Bolt/Screw  
12561387 12561387 12561387 12561387 12561387  
12555162 12555162 12555162 12555162 12555162  
1246249  
1246249  
1246249  
1246249  
1246249  
• Ignition voltage to PCM must be maintained at or above 7 volts during cranking.  
• The operation of the 4.3L V6 90 Degree Engine System shall not adversely affect any of the  
vehicle electrical subsystems.  
• Conversely, the operation of any vehicle electrical subsystem shall not adversely affect the  
operation of the 4.3L V6 90 Degree Engine System.  
• Before performing any welding, disconnect negative battery cable and PCM connectors to  
avoid damage to other systems components.  
• All engine electrical systems and controllers are not to exceed the allowable levels of radiated  
electromagnetic emissions described in specification GM 9114P dated December 14, 1994.  
• Engine Electric Wiring Harness Including Connections Provisions For:  
Battery, Grounding Requirements, Mounting (Wiring Retention for Function and  
Appearance), Starter, Alternator, Sensors and Switches, Thermal Environment, IP Signal  
Information, Oil Life, Monitoring, Oil Level Sensing, PCM & Governor Wiring Assembly.  
• All Electrical Connector Insertion Forces Less than 80 Newton’s.  
• The electrical generator assembly is not part of the engine scope of supply.  
The following table shows the different Pre-Heaters and Components coupled to the L35 engine  
and GM platforms.  
Engine Pre Heather  
( 6Y 2C )  
P-Truck C/K Truck  
G-Van  
M/L -Van S/T Truck  
Pre Heather ASM  
Screw/Bolt  
12556261 12556261 12556261 12556261 12556261  
15969147 15969147 15969147 15969147 15969147  
11509126 11509126 11509126 11509126 11509126  
11515763 11515763 11515763 11515763 11515763  
Cord ASM  
Strap  
52353022 52353022 52353022 52353022 52353022  
15726112 15726112 15726112 15726112 15726112  
15517469 15517469 15517469 15517469 15517469  
3.2.3 GMPT interface with CHASSIS BRAKE ABS System  
Figure 3.2.1-I to 3.2.1-XVIII shows the PCM Engine to Vehicle Mechanization Diagram with this  
interface.  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
3.2.4 GMPT Interface with HVAC System  
In order to properly attach the engine to the vehicle and interface with the Vehicle Cooling  
System the following cooling issues must be considered:  
This engine is designed to operate with a surge tank that shall be located at the highest point of  
the cooling system.  
a. Coolant contamination level  
b. Corrosion protection  
1. Coolant change intervals  
2. Coolant type  
e. By-pass System  
1. Deaeration  
2. Fill rate & capacity  
3. System pressure and Draw Down  
f. Engine Oil Cooler  
c. Ports/Sealing  
1. Water pump  
d. Temperature Management  
1. Thermostat and Low Coolant Sensor location  
Figure 3.2.1-I to 3.2.1-XVIII shows the PCM Engine to Vehicle Mechanization Diagram with this  
interface.  
3.2.4.1 Fan Cooling System  
Figure 3.2.1-I to 3.2.1-XVIII shows the PCM Engine to Vehicle Mechanization Diagram with  
this interface. The following table shows the different Fan ASM and Components coupled to  
the L35 engine per GM platforms.  
Engine Air Fan ASM  
( 6K1 )  
P-Truck  
C/K Truck  
G-Van  
M/L -Van S/T Truck  
Tensioner  
12561094  
12561094 12561094 12561094 12561094  
Bolt/Screw Tensioner  
11517648  
11517649  
11517648  
N/A  
N/A  
N/A  
N/A  
11517649 11517649 11517649  
Belt  
12559620  
12569349 12564749 12564762 12564761  
12564759/60 12569350 12564760 12564759 12564763  
12564763/4  
N/A  
N/A  
N/A  
12564761  
12564763  
N/A  
N/A  
12564759  
N/A  
Blade ASM FAN  
Blade ASM FAN  
Bolt/Screw Blade  
Clutch ASM FAN  
15738321  
N/A  
15017911 15002575 15976889 15600390  
N/A 15657381 N/A 15976889  
15548719  
11516869 15548719 15548719 15548719  
15735393  
15735394  
N/A  
22149836 22135998 15976997 15154901  
22149880 22136704  
15710101 N/A  
N/A  
N/A  
22136712  
N/A  
Engine Pulley Crank Shaft  
10085754  
10085754 10085754 10085754 10085754  
10179287 10179287 10179287 10179287  
12550053 12550053 12550053 12550053  
11516292 11516292 11516292 11516292  
12555609 10239930 10239930 10239930  
12556612 12557819 12557819 12557819  
Bolt/Screw Pulley Crank Shaft 10179287  
Pulley FAN  
12550053  
11516292  
12555609  
12556612  
12557819  
Bolt/Screw Pulley Fan  
Pulley ASM Belt Idler  
Pulley ASM Belt Idler  
Pulley ASM Belt Idler  
Bolt/Screw Fan Idler  
N/A  
N/A  
N/A  
N/A  
11515756  
12550053  
11515756 11515756 11515756 11515756  
N/A  
N/A  
N/A  
N/A  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
3.2.4.2 Coolant Properties  
GMPT engines are liquid cooled and designed to operate with a mix of ethylene glycol and  
water. GMPT recommends a daily audit of glycol to water concentration and a yearly audit of  
water quality at the vehicle assembly fill station.  
Mixture Ratio  
52 % Ethylene Glycol and 48 % Water By Volume  
Ethylene Glycol Specifications  
Water Specifications  
- Total Solids  
Any Meeting GM 6277 M Specification  
Maximum Contaminants Or Range  
350 PPM  
- Total Hardness  
- pH  
150 PPM  
6.9-9.0  
- Calcium And Magnesium  
- Chlorides  
100 PPM (COMBINED)  
50 PPM  
- Sulfates  
100 PPM  
- Bicarbonates  
150 PPM  
3.2.4.3 Coolant Radiator (Recommended Minimum Values)  
Cooling Radiator  
L35  
UNITS  
Radiator Heat Evacuation To Coolant  
Total Average Heat Coefficient-  
GM Recommend Better Than  
4460  
34  
BTU/Min  
BTU/Hr-sq. ft-F  
Radiator Efficiency -  
GM Recommend Better Than  
60%  
Radiator Type  
Radiator Capacity (minimum)  
GM Recommend Better Than  
Crossflow  
11.8  
Liters  
Minimum Radiator Frontal Area  
Radiator Total Area  
Radiator Coolant Flow  
@ Rated Power  
TBD by Customer  
TBD by Customer  
Sq. Meter  
Sq. Meter  
GPM  
Radiator Coolant Peak Pressure  
Thermostat Open  
103  
170  
kPa  
F
Thermostat Fully Open  
Radiator Coolant Inlet Location & Size  
Radiator Coolant Outlet Location & Size  
Fan  
190  
Top/ 46.2  
Bottom/ 60.0  
F
mm  
mm  
Engine Driven  
1:25 Ratio to Crank  
3.2.4.3.1 Heater Performance  
Three coolant temperature performance exist in support of heater performance for the  
purpose of providing adequate cab heat. These temperatures shall be selected through  
the thermostat setting.  
3.2.4.3.1.1 Fast Warm-Up  
The engine can provide a minimum of 170°F coolant to the heater in 10 minutes after  
the engine started to run from cold conditions.  
3.2.4.3.1.2 Uniform Comfort.  
The engine can provide 190°F +/-5°F coolant to the heater at 20 minutes after the  
engine started to run from cold conditions.  
3.2.4.3.1.3 Degradation of Comfort  
The engine can provide 190°F +/-5°F coolant to the heater during the 20 minutes  
idle, after the engine started to run from cold conditions.  
A thermostat temperature of 190°F is assumed. A higher thermostat temperature is  
acceptable.  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
The following table shows the different Radiator ASM and Components coupled to the L35  
engine per GM platforms.  
Engine Coolant Radiator  
( 13A )  
P-Truck  
C/K Truck  
G-Van  
M/L -Van S/T Truck  
Radiator ASM  
52473151 52486600 15766916 52482175 52472963  
Radiator ASM  
Radiator ASM  
Radiator ASM  
N/A  
N/A  
N/A  
52486601 15762434  
N/A  
N/A  
N/A  
52472964  
N/A  
N/A  
N/A  
15762437  
15766914  
N/A  
Cap Radiator  
Reservoir Coolant ASM  
15977333  
15687277  
15982188 15982188 15982188  
15030565 15720807  
15058245 15720808  
Bolt Screw or Retainer  
Bolt Screw or Retainer  
Bracket ASM  
11509745  
N/A  
11515904 22535007 15999164  
N/A  
N/A  
15958651  
N/A  
N/A  
15685170  
15996772  
14054390  
9439035  
9439124  
9439145  
3786276  
14029188  
Cap Reservoir  
Hose Reservoir Coolant  
Hose Reservoir Coolant  
Hose Reservoir Coolant  
Clamp  
15007480  
15689607  
1622710  
1622710  
1626260  
Clamp  
3.2.4.3 Operating Conditions and Measures  
3.2.4.3.1 Heat Rejection  
Heat rejection levels for combined engine coolant and oil are measured per GM Test #9  
and are summarized in the table below. The values for the specific heat rejection to the  
coolant and Lube oil are shown below in table 3.5.3.1-I.  
RPM  
L35  
Truck  
Applications  
L35  
Condition  
Marine  
Applications  
Heat rejection  
Heat rejection  
BTU/Min  
BTU/Min  
2000  
2800  
3600  
1600  
2400  
2000  
3000  
4000  
4200  
4400  
4600  
750  
1339  
2038  
2937  
1536  
2226  
2209  
3001  
3910  
4080  
4309  
4460  
486  
n/a  
n/a  
n/a  
n/a  
n/a  
2336  
3202  
4274  
4314  
4799  
4716  
539  
Road Load  
Road Load  
Road Load  
7.2% Grade  
7.2% Grade  
WOT  
WOT  
WOT  
WOT  
WOT  
WOT  
Idling  
1300  
2200  
1016  
1756  
1074  
1826  
Parked  
Parked  
Table 3.5.3.1-I 4.3L V6 90 Degree Engine Heat Rejection  
3.2.4.3.2  
System Pressure  
GMPT engines are designed to operate with a pressurized cooling system and surge tank.  
System pressure is controlled with a spring loaded pressure (RC33) relief cap with a nominal  
setting of 15 Psi.  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
3.2.4.3.3  
Coolant Operating Temperatures  
This engine has been validated for continuous duty including continuous operation at  
WOT with the coolant temperature under thermostat control (see thermostat start to  
open and full open temperatures). Limited operation above thermostat full open  
temperature is allowed as shown in the table below.  
OPERATION  
Extended Idle (Up To 30 Minutes) In Ambient up to >38 C  
City Traffic Operation In Ambient  
- Up To 109.4 F  
MAX ALLOWABLE TEMP  
262.4 F  
237.2 F  
255.2 F  
- Up To 118.4 F  
Grades  
- Trucks At GCW, 7.2% Grade, 100 F, Ambient  
- Passenger Cars At GVW, 7.2% Grade, 100 F , Ambient  
High Speed Operation  
250 F  
250 F  
- Passenger Cars At GVW, 167 kph, Up To 48 C Ambient  
Soaks Following Grade Operation  
237 F  
262 F  
3.2.4.3.4  
Flow Rates  
Flow to the radiator and heater vary with pump speed, thermostat valve position, and  
pressure drop across the heat exchangers.  
RPM  
L35  
Condition  
All Applications  
Coolant Flow  
GPM  
2000  
2800  
3600  
1600  
2400  
2000  
3000  
4000  
4200  
4400  
4600  
750  
32.5  
46.1  
59.9  
26.1  
37.7  
32.6  
49.5  
66.6  
70.1  
73.6  
76.5  
12.1  
21.2  
36.0  
Road Load  
Road Load  
Road Load  
7.2% Grade  
7.2% Grade  
WOT  
WOT  
WOT  
WOT  
WOT  
WOT  
Idling  
Parked  
Parked  
1300  
2200  
Figure: 3.2.4.3.4 - I - Water Pump Flow Rates  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
3.2.4.3.5  
Coolant Fill  
Assembly Plant- GMPT requires the engine cooling system to be at least 95% filled  
(from a dry system no bleed valves) before the engine is started.  
Service- GMPT requires a clear unobstructed view of the coolant deaeration tank be  
provided in an underhood location. The system should be designed to be capable of  
replacing 95% of the coolant drained during a service situation without starting the  
engine or opening any bleed valves.  
3.2.4.3.5.1 System Drain Down  
The system is to be designed to displace all air in the engine, hoses, heater(s), and  
radiator into the deaeration tank while the engine is operating. After the engine,  
upper radiator hose, and radiator are charged with coolant the charge must be  
maintained at all times prior to low coolant light activation. The only air in the  
cooling system should be located in the deaeration tank.  
Letting air enter the engine, upper radiator hose, or radiator can allow coolant in the  
system to drain down, which is unacceptable. Drain down can result in a false  
indication of the coolant level at the deaeration tank.  
It also forces the system to run aerated coolant for a short time after every cold start  
while the engine, upper radiator hose, and radiator are recharged with coolant.  
3.2.4.3.5.2 Service Fill/Procedure  
Capability to fill the system to 95% or more of capacity without running the engine.  
This ensures enough coolant is in the system to prevent engine damage if run for  
extended periods of time without checking the coolant level. Rear heater systems  
generally can not be filled without running the engine making it difficult to achieve a  
90% static fill. However, rear heaters are difficult to drain as well and typically do  
not have to be refilled during service fill. If the rear heater is drained, a few minutes  
of running at moderate engine speeds is usually adequate to flush the air out of the  
heater and achieve a 90% fill.  
3.2.4.3.5.3 Fill Rate  
The system should be able to achieve a 95% static fill at the 3 GPM rate.  
This indicates adequate sizing of the deaeration tank fill line and proper venting of the  
system.  
3.2.4.3.5.4 Drawdown Capacity  
The cooling system must be capable of losing approximately 10% or 2.4L (2.5 QTS.)  
of coolant without aeration occurring or loss of flow. Run at 3500 RPM with a  
blocked open thermostat.  
This allows the engine to operate without damage when only a 95% fill is obtained.  
3.2.4.3.5.5 Deaeration Capability  
The ability for the system to run un-aerated within 20 minutes after a service fill.  
Run with an operating thermostat and at 3500 RPM. The system needs to be able  
to purge air into the deaeration tank during closed and partially open thermostat  
conditions.  
3.2.4.3.5.6 Air Handling Capability  
The ability to lose no more than 50% of the water pump flow with 0.2 CFM of air injected  
into the engine. The air is injected into an area after the water pump to simulate a  
combustion leak into the coolant. Coolant loss during the test should not exceed the  
Drawdown capacity. Test run at 3500 RPM with a blocked open thermostat.  
3.2.4.3.5.7 Low Coolant Light Calibration  
The low coolant light is to be calibrated to activate prior to coolant aeration  
occurring. Normally the low coolant light should come on when the amount of  
coolant lost is less than or equal to the Drawdown capacity.  
In some installation (see 3.5.3.5.1) the Low Coolant Light will have to come on prior  
to the Drawdown capacity to prevent drain down.  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
3.2.4.4 Coolant and Heater Subsystem Descriptions  
3.2.4.4.1 Coolant Inlet- Water Pump Inlet Restriction  
Typical Diameter: 60 mm +/- 0.3 mm.  
The suction at the water pump inlet should not exceed approximately 1.0" HG (-1.0" HG  
pressure) when run at 3500 RPM without a pressure cap. Exceeding this suction could  
cause the lower radiator hose to collapse if the system loses cap pressure.  
3.2.4.4.2  
Typical Diameter: 46.2 mm +/- 0.3 mm.  
3.2.4.4.3 Heater Feed-  
Typical Diameter: 15.9 mm +/- 0.3 mm or 19.05 mm +/- 0.3 mm  
3.2.4.4.4 Heater Return  
Typical Diameter: 15.9 mm +/- 0.3 mm or 19.05 mm +/- 0.3 mm  
3.2.4.4.5 Coolant Hose Material  
Coolant Outlet-  
GMPT requires hose material meeting GM specification 6140m, 6250m, 6278m, or  
6149m (hose material specifications vary by the severity of the environment they will be  
subjected to).  
Reference radiator and heater hose dimensional specifications listed on drwg. #  
12552514. Suggested lubricant for ease of hose assembly to inlet nipple is GM  
9985406  
3.2.4.4.6  
Hose Clamps  
GMPT requires the use of constant tension clamps for all hose connections.  
Reference dimensional information on hose clamp drwg. # 11516215 and equivalents.  
3.2.4.4.7  
Thermostat  
- start to open temperature- 170°F  
- full open temperature-  
190°F  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
3.3.1 GMPT Interface with CHASSIS Fuel System  
Figure 3.2.1-I to 3.2.1-XVIII shows the PCM Engine to Vehicle Mechanization Diagram with this  
interface.  
RPM  
L35  
Truck  
Application  
L35  
Units  
Marine  
Application  
800  
1200  
1600  
2000  
2400  
2800  
3200  
3600  
4000  
4400  
4800  
5200  
17.16  
26.45  
35.12  
44.17  
54.79  
64.74  
75.30  
84.40  
94.33  
102.80  
105.4  
106.97  
17.7  
27.3  
37.9  
46.7  
56.1  
67.9  
76.3  
85.1  
94.9  
104.3  
112.2  
119.0  
PPH  
PPH  
PPH  
PPH  
PPH  
PPH  
PPH  
PPH  
PPH  
PPH  
PPH  
PPH  
Figure: 3.3.1 - I 4.3L V6 90 Degree Engine - Fuel requirements vs. Engine Speed  
The following table shows the different Fuel Lines, Fuel Tank and Evaporative Assemblies and  
Components coupled to the L35 engine per GM platforms.  
Fuel  
P-Truck C/K Truck  
G-Van  
M/L -Van S/T Truck  
N/A  
( 8 A )  
Pipe ASM Fuel  
N/A  
N/A  
N/A  
N/A  
15030585 15000300  
Pipe ASM Fuel Feed  
15043227 15023800 15023800  
15043228 15023801 15023801  
15023802 15023802  
Fitting Fuel Pipe  
Hose  
15550219 15550219  
N/A  
N/A  
15036790 15036790  
15054322 15054322  
15733594 15765804  
15035085 15765806  
15721387  
Fuel Filter  
15530354  
25055129  
N/A  
25121800 25171788 25171788  
Bracket  
Clip/Clamp  
N/A  
343449  
15013855 15009324  
343449 343449  
N/A  
343449  
N/A  
343449  
15973085 15973085 15973085 15973085 15973085  
15677730 15677730 15677730 15677730 15677730  
Bolt/Screw/Nut/Stud  
11515211 11515211 11515211 15604106 15604106  
11516076 11516076 11516076 15708937 15708937  
11508279 11508279 11508279  
3932368  
9428638  
3932368  
9428638  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
Fuel Tank  
( 8 B )  
P-Truck C/K Truck  
G-Van  
M/L -Van S/T Truck  
Fuel Tank ASM with Pump  
N/A  
15759638 15017931 15747872 15013150  
15759639 15017932 15066407 15028431  
15767150 15020046 15048831  
15062877 15761468  
15762977  
15762978  
Fuel Tank ASM no Pump  
Fuel Pump  
15721311  
25315352  
25314575  
N/A  
N/A  
N/A  
N/A  
N/A  
15062879  
N/A  
N/A  
Fuel Valve  
Pipe Filler  
15978533  
15030687 15747585  
N/A  
N/A  
N/A  
N/A  
15052676 15061623  
15015206 15062980  
15062981  
Strap  
15311568 15745095 15015617 15745065 15015589  
15745096 15015618  
15770877 15745014  
15770878 15745015  
15032208  
Cap  
22616285 15763225 15746557 22660002 22660002  
Bolt/Screw/Nut/Stud  
9428638 11516551 11516523 15604106 15604106  
11518477 11516770 11518476 11508561 11508561  
11517784  
Fuel Evaporative  
( 8 D )  
P-Truck C/K Truck  
G-Van  
M/L -Van S/T Truck  
Canister ASM  
17098106 15056485 17098085 17098085 17201171  
17097127  
17097120  
Shield  
Hose  
15004076  
10282447 15759042  
15721451 15759043  
15733597  
N/A  
15012787  
9439150  
15150414  
15726983  
15768562  
15721447  
15721448  
15731510  
Clamp  
10108259 10108259  
11516221 11516221  
N/A  
10108259 10108259  
11516221 11516221  
Separator  
Bracket  
17096210  
N/A  
15032645 15032645 15032645  
15032646 15032646 5032646  
15009801 15056490 15769694 15769694 15049107  
15013689  
15746404  
17565062  
15731699  
15742240  
15734230  
15992101  
Harness  
12556909 12555973 12561900 12561900 11509087  
12566190  
Strap  
Valve  
11509087 11509087 15000499 11509087 11509087  
12559015 15032643 15032643 15759225 25658328  
15032644 15032644  
12559015  
Bolt/Screw/Nut  
11508797 11516573 11515211  
11515211 11515654  
3847758 11513914 11508797 11508797 11515656  
3975550  
3847758  
3975550  
11515658  
11515211  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
3.3.2 GMPT interface with Air Induction System  
3.3.2.1 Air Requirement  
RPM  
L35  
Truck  
Application  
L35  
Units  
Marine  
Application  
800  
1200  
1600  
2000  
2400  
2800  
3200  
3600  
4000  
4400  
4800  
5200  
23.8  
37.8  
51.8  
65.8  
81.3  
24.9  
39.3  
52.7  
67.4  
82.9  
gr/sec  
gr/sec  
gr/sec  
gr/sec  
gr/sec  
gr/sec  
gr/sec  
gr/sec  
gr/sec  
gr/sec  
gr/sec  
gr/sec  
97.7  
99.0  
113.7  
128.8  
143.3  
154.7  
160.9  
163.7  
116.3  
130.5  
142.3  
154.0  
165.1  
175.0  
Figure: 3.3.2.1-I 4.3L V6 90 Degree Engine Air Requirements  
3.3.2.2 Air Flow Path  
The air flow path in the vehicle at the air inlet of the air induction system shall not be  
obstructed with vehicle components that will cause loss of pressure or flow disturbance.  
All performance parameters specified in paragraph: 2.3.2.1 were measured with a maximum  
air restriction of 1” of Hg.  
As reference in table 3.3.2.1 - I, development power and torque data is shown to illustrate  
the order of magnitude that may result as increasing the induction restriction.  
Table 3.3.2.1 - I  
4.3L V6  
Development Peak Power and Torque Levels  
Induction Restriction *  
Induction  
Restriction  
Torque  
(Lb.-Ft)  
Power  
(Hp)  
1” Hg.  
1.2” Hg.  
1.4” Hg.  
1.6” Hg.  
264  
262  
260  
258  
200  
198  
196  
194  
* Exhaust backpressure held at 11” Hg.  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
3.3.2.4 Temperature Rise  
The intake of air must avoid the suction of air coming from the hot spot areas of the inside of  
the engine bay such as proximity to exhaust manifold.  
As referenced in table 3.3.2.4 - I, development power and torque data is shown to illustrate  
the order of magnitude that may result as increasing the induction temperature.  
Table 3.3.2.4 - I  
4.3L V6  
Development Power Variation and  
Induction Temperature Increase  
Inlet Air Temperature  
(Deg-F)  
Power Loss  
(%)  
77  
0
90  
2.7  
5.1  
8.5  
11.6  
16  
100  
122  
144  
176  
208  
20.3  
3.3.2.4 Filtration Requirements  
GMPT requires an air filtration medium that is capable of removing 98.7% of the material  
contained in reference material SAE “Course Dust”.  
The following table shows the different Air Cleaner ASM and Components coupled to the  
L35 engine per GM platforms.  
Engine Air Cleaner  
( 6 M 3 )  
P-Truck C/K Truck  
G-Van  
M/L -Van S/T Truck  
Air Cleaner  
25147074 25322546 15754209 15747601 15747865  
15766610  
15747867  
25171130  
Bracket  
15982176 15735434  
15987694 15735435  
Adapter  
15997186  
Bolt/Screw/Nut/Stud  
3846202 11516484 11516727 15992646 15994910  
11508300 11516589 11992647  
11509542 11516587 11514596  
14045263 15994910  
15992647  
11515933  
15994910  
Duct  
15985845 15057511 15016578 25160175 25173868  
15985846 25168087  
15729512  
15971184  
15755160  
15020026  
Clamp  
Elbow  
15986419 15986419  
2465839  
8868639  
2465839  
8868639  
15003750 15003750  
15994899 15994899  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
3.3.3 GMPT Interface with Oil Cooling Subsystem  
3.3.3.1  
Oil Cooler Requirements -  
Heat Rejection to Oil - Consult GM Application Engineer.  
The following table shows the different Oil Cooling, Filter Assemblies and Components  
coupled to the L35 engine per GM platforms.  
Oil Cooling  
( 6 G 3 )  
P-Truck C/K Truck  
G-Van  
M/L -Van S/T Truck  
Oil Cooler ASM  
15722841 15021207 15021207 15021207 15021207  
15007061 15736423 15736423 15764375 15760333  
Oil Hose Cooler ASM  
Bolt/Screw/Nut  
9419683  
9419683  
9419683  
9419683  
9419683  
11514139 11514139 11514139 11514139 11514139  
15679508 15679508 15679508 15679508 15679508  
Bracket  
15557752  
Bolt Screw w/Nut  
11508253 11508253 11508253 11508253 11508253  
11516071 11516071  
Strap  
11501907 15607246 15607246 15607246 15607246  
15996659 15029984 15029984 15029984 15029984  
11509759 11515210 11515210 11504357 11504357  
15719697 15719697  
Bracket  
Bolt Screw  
Connector  
Oil Filter  
( 6 G 5 )  
P-Truck C/K Truck  
G-Van  
M/L -Van S/T Truck  
Filter  
25170846 25014831 25014831 25014831 12556880  
15026051  
15026052  
Adapter  
12558731 3952301  
12562830 12562831 12562831 12562831 15760334  
3952301  
3952301  
12556880  
Fitting  
N/A 3853870 3853870 3853870 15689615  
Gasket  
12551589 12551589 12551589 12551589 12551589  
12552828 12552828 12552828 12552828 12552828  
Bolt/Screw  
10168445 3951644  
9421634  
3951644  
9421634  
3951644  
9421634  
11508253  
11505347  
15701734  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
3.3.4 GMPT Interface with Chassis Engine Mountings  
3.3.4.1 Engine Packaging Dimensions  
The packaging dimensions for the 4.3L V6 90 Degree referenced from the center line of  
crankshaft and the rear face of block are shown in the Figure 3.3.4.1-I. Adequate engine roll,  
load, or thermal clearances (which ever is largest) should be added to these dimensions.  
Figure 3.3.4.1 – L 4.3L V6 90 Degree Packaging Dimensions  
3.3.4.2 Recommended Installation Angles  
See Figure 3.3.4.2 for the vehicle installation angle description in a transverse powertrain  
application.  
Side View  
Front View  
Plan View  
Figure 3.3.4.2 Installation Angles  
3.3.4.2.1 Recommended Side View Angle  
The a angle shown in powertrain side view shall not exceed 5 Degree. For greater  
values consult GM Application Engineering.  
3.3.4.2.2 Recommended Front View Angle  
The b angle shown in powertrain front view shall not exceed 5 Degree. For greater  
values consult GM Application Engineering.  
3.3.4.2.3 Recommended Plan View Angle  
The e angle shown in powertrain plan view shall not exceed 5 Degree. For greater  
values consult GM Application Engineering.  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
3.3.4.3 Rear Face of Block Configuration  
The rear face of block is illustrated in Figure 3.3.4.3. Dimensions are from the center line of  
crank.  
Figure 3.3.4.3 Rear Face of Block  
3.3.4.4 Ground Clearance  
No engine component shall be positioned below the vehicle dynamic ground line.  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
The following table 4.4.1-I shows the different Mounting Components coupled to the L35 engine  
per GM platforms.  
Powertrain Mounting  
( 6 Q )  
P-Truck  
C/K Truck  
G-Van  
M/L -Van S/T Truck  
Engine Mountings  
Engine Mounting ASM  
Engine Mounting ASM  
Bolt Screw  
14031472  
15037192  
22174978  
22179440  
15017907 22112499 22173023  
15017908 22112500  
9420462 11516941-2-3 11515765 11509141 9442966  
9424320  
6262211  
11517017-8 25623779 15596428 11517706  
Nut  
9442946  
9442947  
9418897  
9442946  
9442947  
9418897  
9442946 11516077 15956061  
9442947  
9418897  
9442947  
9418897  
9442947  
9418897  
Spacer  
Bracket  
15160007  
15041538  
6259949  
15160007  
15753409  
15753410  
N/A  
N/A  
N/A  
15969182 22145863 15725993  
15054180 15697577 15725994  
Bracket  
15953632  
6259950  
15037193  
15557731  
15753411  
N/A  
N/A  
15708672  
15708673  
15999045  
15999046  
Bracket  
Bracket  
15732463  
15732464  
Bolt Screw  
9433115  
9420462  
9433115  
9420462  
11509141 15672901  
11509141  
Bolt Screw  
Washer  
11517706  
407795  
15531204  
11517706  
407795  
15531204  
Shield  
15037194  
N/A  
15764435-6  
15977043  
Transmission Mountings  
Trans Mounting ASM M74  
Bolt Screw  
15683966  
9441662  
15592071  
N/A  
Washer  
Nut  
11505575  
11516077  
15151028  
9442946  
Trans Mounting ASM MT1  
Bolt Screw  
17990857  
15592071  
11505575  
N/A  
N/A  
N/A  
22179376-7 22145766 15767866  
15717594  
11515946 11500831 15726468  
11514071  
Washer  
N/A  
11500046  
11500223  
Nut  
Shields  
Bolt Screw Shield  
Trans Mounting ASM MG5  
Bolt Screw  
11516077  
N/A  
N/A  
N/A  
N/A  
11514521 11515552 11515552  
15160656  
15712486  
N/A  
N/A  
N/A  
N/A  
N/A  
15761786  
15592071  
11505575  
11516077  
N/A  
N/A  
N/A  
Washer  
Nut  
N/A  
Trans Mounting ASM M30  
N/A  
15768333  
N/A  
Bolt Screw  
Washer  
Nut  
N/A  
N/A  
N/A  
15592071  
11505575  
11516077  
N/A  
N/A  
N/A  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
4.0 DETAILED PERFORMANCE DESCRIPTION  
4.1 EXHAUST AND EVAPORATIVE EMISSIONS  
4.1.1 EPA Certification  
This engine when equipped with GMPT specified exhaust after treatment systems and GMPT  
transmissions has been certified to EPA requirements  
4.1.2 CARB Certification  
This engine when equipped with GMPT specified exhaust after treatment systems and GMPT  
transmissions has been certified to CARB requirements  
4.1.3 Other Regulations  
The Engine must comply with the following regulations: (Based on application and time of  
production.)  
GVWR # LVW#  
FEDERAL (TIER 1) (g/mile)  
CALIFORNIA (TIER 1) (g/mile)  
NOx THC NMHC CO  
PM MILES NOx THC NMHC CO  
50K .98 .45 6.4  
.10 120K  
PM MILES  
.10 120K  
3751 -  
—
—
.80  
.32  
.46  
4.4  
6.4  
—
5750  
.98  
6001 -  
8500  
NOx THC NMHC CO  
PM MILES NOx THC NMHC CO  
50K 1.53 .56 7.3  
.12 120K  
PM MILES  
.12 120K  
5751 -  
—
—
.80  
.39  
.56  
5.0  
7.3  
—
8500  
1.53  
NOx THC NMHC CO  
PM MILES NOx THC NMHC CO  
.66 8.1  
PM MILES  
.15 120K  
8501-  
4.0* 1.3* 15.5* .10* 110K 1.81  
10,000  
8501 -  
14,000  
10,000 - 4.0* 1.3*  
14,000 4.0* 1.9*  
15.5*  
37.7*  
NOx THC THC CO  
2.77  
PM MILES  
.86 10.3 .18 120K  
NOx THC NMHC CO  
>14000 4.0* 1.9* 37.7*  
PM MILES NOx THC THC CO  
PM MILES  
>14000  
3.9* 14.4* .10* 110K  
OPT FOR DIESEL/INCOMPL.* (GVW 8501-14,000)  
NOx & NHM C  
3.9*  
CO  
PM MILES  
14.4* .10* 110K  
* g/bhp - hr  
Figure: 4.1.1-I EPA Regulations  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
4.1.3.1 Onboard Diagnostics  
Onboard diagnostic refers to the ability of the Powertrain control system to self diagnose  
emission performance related problems and communicate the existence of such problems to  
the vehicle operator via the “Service Engine Soon” telltale light present in the vehicle  
instrument panel, or to the service technician via a serial data communication tool attached  
to what has been the Assembly Line Data Link (ALDL), but what is becoming an industry  
standard “Class 2” serial data link per SAE J1850.  
a. Improve in-use compliance with emission standards for the lifetime of the vehicle.  
b. Detect & identify deterioration and malfunction of emission related components and  
systems.  
c. Augment/supplant current inspection/maintenance programs.  
d. Detect deterioration or malfunction of individual emission related components.  
e. Define a standardized electronic communication protocol to enable interrogation of the  
control system so as to allow independent service stations the ability to diagnose and repair  
emission related failures with communized electronic instruments across various  
manufacturer’s product lines.  
4.1.3.2 Applicability  
Table 4.1.3.2 -1 defines the applicability of Federal OBD II requirements to Federally  
emission certified full size GMTG vehicles.  
GVWR (Lbs.)  
OBDII Compliance Requirements  
EPA  
yes  
no  
California  
yes  
< 8500 Lbs.  
8500 < GVWR < 14000  
> 14000 Lbs.  
N/a  
N/a  
N/a  
Table 4.1.3.2-I. Applicability of Federal/California OBD II Full-Size Vehicles  
4.1.3.3 Requirements  
Federal OBD II requirements may be categorized into two basic groups. The two groups  
include:  
a. Standardization requirements  
b. Diagnostic Requirements specific to Federal OBD II  
Requirement  
Description  
Data Link Connector and Protocol  
SAEJ1850 - Specifics requirements for vehicle data  
communications network. GM implementation of this  
standard known as Class 2 Serial Data  
SAEJ1962 - Specifies the new 16 pin under dash  
diagnostic connector.  
SAEJ1978 - Specifies the OBD II scan tool which is  
designed to attach and communicate via the under  
dash diagnostic connector.  
Test Modes and Fault Codes  
Parameter Information  
SAEJ1979 - Specifies CARB/EPA functions and  
messages  
SAEJ2012 - Specifies format and messages for  
diagnostic trouble codes  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
5.0OPERATING ENVIRONMENT  
5.1 ROADWAY GRADES, SURFACES AND HAZARDS  
The careful selection of 4.3L V6 90 Degree Engine and Transmission in accordance with the proper  
installation to the vehicle will assure the operation of the engine in a very wide range of roadway  
grades, surfaces, hazard and Off Road conditions.  
Altitude: The engine is designed to function at altitudes from 200ft (61M) below sea level to 14500ft  
(4420M) above sea level.  
Gradability: The engine is designed to function at grades -16<0< 16% GM Application engineering  
will support the customer with applications out of this range.  
5.2 CRITICAL COMPONENT TEMPERATURE LIMITS  
The following table 5.2 shows Critical Component Temperature Limits as a reference value for  
different components. The GM application will verify these values for each specific application. All  
engine non-metallic components not listed in the table will withstand a minimum underhood  
temperature of 121 Degree Celsius.  
Component  
Temperature Range Excursion Temp (Deg. C)  
Coolant Temperature Sensor  
Aux. Cooling Fan Switch  
ESC Sensor  
Spark Plug Wire Conduit - Nylon  
Spark Plug Wire Clips - Nylon 66  
Spark Plug Wire Boots - Hi Temp Silicone  
Fuel Injectors  
MAP Sensors  
Fuel Rail  
Coil Driver Module  
Crank Sensor  
Oxygen Sensor Connector  
Starter Motor  
High Voltage Switch & Internal CAM Sensor  
ECM Coolant Sensor  
Ignition Coil  
MAF sensor  
Throttle Body  
Purge Valve  
Evap. Tube  
-40 to 132  
-40 to 132  
-50 to 135  
-40 to 120  
-40 to 135  
-40 to 232  
-40 to 120  
-40 to 105  
-40 to 125  
-40 to 125  
-40 to 150  
-40 to 125  
-40 to 121  
-40 to 150  
-40 to 155  
-40 to 105  
-40 to 125  
-40 to 120  
-40 to 125  
-40 to 125  
-40 to 90  
-40 to 125  
-40 to 135  
-40 to 150  
-40 to 232  
-40 to 135  
-40 to 130  
-40 to 950  
-40 to 125  
-40 to 135  
-40 to 150  
-40 to 150  
-40 to 150  
-40 to 150  
-30 to 128  
-40 to 121  
172  
172  
185  
180  
200  
272  
160  
145  
165  
165  
165  
165  
161  
165  
195  
145  
165  
160  
150  
150  
125  
165  
175  
190  
272  
175  
170  
1100  
165  
175  
190  
190  
190  
190  
150  
121  
Canister  
IAT Sensor  
EGR & Internal  
Oil Pressure Sensor  
Ignition Cable  
Block Heater  
Bypass Coolant Hose  
Exhaust Manifold & Components  
Underbody Attaching Harnesses/Connectors  
Transmission to Engine Electrical Connectors  
Oil Pan Gasket  
Quick Connect Cooler Fitting Seal  
Oil Pan Drain Plug Seal  
NSBU Switch  
Oil Mineral  
Belts  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
5.3 HUMIDITY, RELATIVE HUMIDITY (SEE CHART 5.2-I)  
5.4 PRESSURE (SEE CHART 5.2-I)  
The 4.3L V6 90 Degree Engine shall be able to withstand any combination of environment conditions  
that it may be exposed to in 10 years.  
For the purpose of this application manual the environment is defined as the 4.3L V6 90 Degree  
Engine exposed during the percentage of his life to the conditions showed in the chart 5.2.1-I.  
Table : 5.2.1-I Temperature Operating Environment  
Functionality  
Minimum  
Temperature  
Maximum  
Temperature  
Operate, Start Unassisted  
Operate, Start Assisted  
-20 F  
-40 F  
120 F  
135 F  
(1)  
(1) Assisted starts in the -20 to -40 degree Fahrenheit range shall be interpreted as meaning that the vehicle must start  
under the defined condition with use of appropriate aids such as an RPO engine block heater, reduced viscosity oil, an  
auxiliary battery and or battery blanket(s). In the 120 to 135 degree Fahrenheit range an assisted start is defined as  
permitting a hot engine to cool down to a level at which it will restart.  
Chart 6.2.1-I Environment Definitions  
The temperature of the different Subsystems configuring the 4.3L V6 90 Degree Engine during  
operation might be appreciable different from the values indicated in the Chart 5.2.1-I but will never  
jeopardize the engine performance .See paragraph 5.2 for component max. temperatures.  
The GM Application Engineer will define the TBD values in correspondence with the test procedure  
adopted by the customer.  
5.5 Underhood/Underbody Car Wash  
No actual or projected loss of function or performance of the engine system shall occur as a result of  
operating the vehicle in a car wash environment.  
5.6 Fording  
Consult the GM Application Engineer for application in conditions during Fording Operations.  
5.7 Sand And Dust Exposure  
No actual or projected loss of function or performance of the engine system shall occur as a result of  
operating the vehicle in a sandy or dusty environment when the recommended air induction system  
maintenance is performed.  
5.8 Gravel And Stone Chip Exposure  
No actual or projected loss of function or performance of the engine system shall occur as a result of  
operating the vehicle in a gravel and stone environment.  
5.9 Ozone exposure  
No actual or projected loss of function or performance of the engine system shall occur as a result of  
operating the vehicle in an environment with ozone exposure.  
5.10 Electromagnetic Environment  
The 4.3L V6 90 Degree Engine System is tested to ensure that electromagnetic environmental  
conditions would not interfere with engine performance.  
5.11 Shock, Impact  
During the course of the normal operating life of the vehicle, the engine may be exposed to shock  
loading. The engine, when installed in the vehicle, will be able to withstand the following G forces.  
These are considered as random singular occurrences and are not cyclic.  
a. Vertical - 2g’s, b. Fore-Aft - 6g’s, c. Lateral - 2g’s.  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
5.12  
Vibration Powertrain Bending  
Powertrain Bending is a source of low frequency noise (50-200 Hz) which results in vibration.  
Powertrain bending is defined as the point of the powertrain’s first vertical or horizontal bending.  
In the case of the 4.3L V6 90 Degree Engine, the 2nd and 3rd orders of vibration are considered. The  
low frequency vibration generated by Powertrain bending can be transmitted through the mounts  
and into the frame and body of the vehicle.  
This induced energy can cause vibration of vehicle components, which set up objectionable  
resonance for the driver and passengers. For this reason, it is desired to make the Powertrain  
package stiff enough so the Powertrain bending occurs at an engine RPM outside of the normal  
operating mode or driving conditions of the vehicle. The ideal situation is to target the powertrain’s  
bending moment so it occurs past the engine’s maximum RPM.  
The minimum Powertrain stiffness as measured in units of Hertz to accomplish this can be  
determined from the following equation:  
Min. Bending Frequency (Hz) = (Constant *) x (RPM Max. Rated) * Use constant from table 6.12.1-I.  
60 sec.  
Table 6.12.1-I. Significant Orders of Vibration  
Engine Configuration  
L4  
Orders of Vibration  
2nd Order  
Constant *  
2
2
2
V6 - 60°  
V6 - 90°  
V6 - L6  
2nd Order  
2nd Order  
3rd Order  
3
V8 - 90°  
V8 - 90°  
V8 - 90°  
1st Order  
1-1/2 Order  
4th Order  
1
1.5  
4
Example: a. 4.3L V6 90 Degree Engine = (2) x (5000 RPM) = 166 Hz Bending Frequency  
60 sec.  
In the case of a 4.3L V6 90 Degree Engine, it is desired to have the Powertrain stiffness great enough  
so the bending resonance occurs at or above 90 Hz when the Powertrain is installed in the vehicle.  
If the 4th order of vibration is considered, it is necessary to move the bending resonance out past 240  
Hz to assure no resonance occurs within the engine operating speed. Since this is impractical  
because of the design of the engine block and transmission housing, it is desirable to tailor the  
component design so the bending resonance does not occur at idle or between 1800 and 2500 RPM.  
See GM Application Engineer for further analysis.  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
6.0RECOMMENDED USAGE CONSTRAINTS  
The following defines the outer limits of the envelope of operation that this engine has been validated to  
(for its original application). Due to the extreme variation of potential usages, the attached information  
should only be used as a guide toward pursuing alternate applications. Operation “outside” of the  
described envelope should not be attempted without extensive testing and guidance from product  
engineering. Data monitoring and providing shutdown capability would provide additional assurance that  
the application’s intended envelope is not violated. The following parameters warrant measurement  
consideration.  
• Engine Speed  
-PCM controlled and monitored- Dash Light Sign  
-Dash Light Sign  
-PCM controlled and monitored- Dash Light Sign  
-Dash Light Sign  
• Oil Temperature  
• Coolant Temperature  
• Coolant Level  
6.1 ENGINE PRE-CONDITIONING PRIOR TO NORMAL OPERATION  
No towing or continuous WOT operations for the first 500 miles or 12 hours.  
6.2 ENGINE SPEED  
Engine speed range has the ability to impact vehicle fuel economy, durability, and driveability  
performance, particularly under heavy load.  
The engine will provide the following speed dynamic range values shown in Table 2.2.3-II.  
6.2.2 Maximum Start Time.  
Engine start time is directly affected by the design of the starting subsystem. The starting  
subsystem parameters include starter efficiency, battery cable length, battery cable gauge,  
corrosion resistance and conductivity of cable connectors and battery cold cranking capacity.  
The vehicle will start within the maximum times specified in Table 6.2.2 -I and continue to run at idle.  
Table 6.2.2-I Maximum Start Time by Temperature  
120 to 0 F  
0 to -20 F  
1 sec.  
2 sec.  
Table 6.2.2 -I 4.3L V6 90 Degree Engine Cranking  
For temperature operating environment see table 5.2.1-I.  
All starting times require at least 80% battery charge.  
A starting aid (block heater) is required below -20°F.  
Ignition voltage to PCM must be maintained at or above 7 volts during cranking.  
6.2.3 Idle Quality (Speed and Stability)  
6.2.3.1 Idle Stability  
The PCM algorithm modifies fuel pulse and engine parameters to create smooth engine  
idling at the values specified by the application engineer.  
6.2.3.2 Idle Speed  
The idle speed selected shall comprehend other subsystem requirements (i.e. cooling,  
electrical, noise, accessory drive, etc. and be developed in the vehicle).  
The engine idle speed will be targeted at the values shown in table 6.2.3.2-I to minimize fuel  
consumption and emissions.  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
Engine Speed Condition  
L35  
Idle Speed -  
Auto Transmission  
575 rpm  
Idle Speed -  
Manual Transmission  
525 rpm  
Maximum Upshift  
5200 rpm  
Maximum Upshift  
Hysteresis  
5200 rpm  
Table 6.2.3.2 -I V 6 Speed Dynamic Range  
a) Operation at normal operating coolant temperature ( Range : 80 -128 ¥ C)  
Maximum Transient (W.O.T.)  
Minimum Transient (W.O.T.)  
Instantaneous Maximum  
Continuous Maximum  
5200 RPM  
600 RPM  
5200 RPM  
4600 RPM  
b) Operation at cold coolant temperature  
Maximum @ - 28°C  
4600 RPM  
4600 RPM  
c) Operation at hot coolant temperature  
Maximum @ 128°C  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
6.3 ENGINE LOAD  
Sustained high engine loads (loads in excess of 90% of W.O. T. torque) should not be applied below  
peak torque - engine rpm, See paragraph 2.3.2.1.  
Torque Fluctuations.  
Torque Fluctuations at WOT, will not exceed a value of ± 5% of the nominal torque value between  
1000 RPM & max. rated speed.  
Brake Specific Fuel Consumption  
The engine brake specific fuel consumption (bsfc) shall be as follows:  
1. The engines nominal brake specific fuel consumption point on a W.O.T. curve is shown in  
table 6.3 -I.  
2. The engine nominal specific fuel consumption shown in table 7.3 -I are for an operating range  
between peak torque and maximum power at full load.  
3. The engines best part throttle bsfc (on a fuel map) is shown in table 7.3 -I.  
RPM  
L35  
Truck  
L35  
Marine  
Notes  
Applications  
Applications  
800  
0.529  
0.521  
0.484  
0.470  
0.471  
0.469  
0.478  
0.483  
0.500  
0.525  
0.532  
0.556  
0.495  
0.478  
0.481  
0.471  
0.466  
0.472  
0.458  
0.452  
0.460  
0.479  
0.506  
0.550  
lb./BHP-Hr  
lb./BHP-Hr  
lb./BHP-Hr  
lb./BHP-Hr  
lb./BHP-Hr  
lb./BHP-Hr  
lb./BHP-Hr  
lb./BHP-Hr  
lb./BHP-Hr  
lb./BHP-Hr  
lb./BHP-Hr  
lb./BHP-Hr  
1200  
1600  
2000  
2400  
2800  
3200  
3600  
4000  
4400  
4800  
5200  
Table 6.3 -I V6 4.3L Engine BSFC  
Engine Brake Capacity  
FMVSS requires engine braking in at least one of the lower ratios, below 25mph.  
For a transmission type similar to the 4L60-E this is equivalent to 2nd gear. For another type of  
transmission combination the braking capability should be verified.  
For manual transmissions, engine braking is calibrated with the GM transmissions to occur in the  
highest ratio in each forward selector range  
Some off road applications or very heavy load situations might require additional subsystems to  
increase engine brake capacity.  
Depending on the application, the GM release engineer and the customer will determine the  
necessity of auxiliary or additional engine brake aid sub systems.  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
6.4 OIL & CRANKCASE VENTILATION  
Ambient Operating Temperature  
-30°C to 128°C:use SAE 5W-30  
Oil Quality: Use oil that meets the CF-2 quality standards of the API  
Crankcase Ventilation  
PCV Positive Crankcase Ventilation is used in the 4.3L V6 90 Degree.  
6.5 COOLANT:  
Coolant (See 3.5 Cooling/Heater)  
Ethylene Glycol water mix 52/48 (normal) up to maximum of 60% glycol, 40% water  
Coolant Temperature: See Section 3.5  
Coolant Pressure: See Section 3.5  
Warm-Up Rate: See Section 2.3.2.3.4  
6.6 COMBUSTION CONTROL  
All combustion controlled parameters are adjusted automatically through the PCM  
7.0 QUALITY, RELIABILITY, & DURABILITY (QRD)  
7.1 QUALITY AND RELIABILITY  
Minimum Level of warranty is 12 month and 12000 miles, but there are available alternative warranty  
plans throughout the GMPT and GM Service Group.  
7.2 DURABILITY - USEFUL LIFE  
Useful Life Definition  
Usage  
Mileage  
120,000  
Years  
10  
4.3L (Light Duty) Unleaded Fuel  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
8.0SERVICE REQUIREMENTS  
8.1 MAINTENANCE SCHEDULES (SEVERE USAGE AND NON SEVERE USAGE).  
There are two maintenance schedules applicable to the 4.3L V6 90 Degree Engine.  
These maintenance schedules relate to severe usage and non-severe usage.  
8.1.1 Maintenance Schedules - Severe Usage (Schedule I)  
Severe usage or short trip/city shall continue to be defined by the following description of typical  
operation in the vehicle’s owner’s manual:  
- Most trips are less than 4 miles (6km);  
- Most trips are less than 10 miles (16km), and the ambient temperature is below freezing  
- The engine is at low speed most of the time (door to door delivery, stop and go traffic,  
commercial use)  
- The vehicle is operated in dusty areas or off road frequently;  
- The vehicle is used to tow a trailer  
8.1.2 Maintenance Schedule - Non Severe or Long Trip/Highway Usage (Schedule II)  
Long trip/highway shall continue to be defined in the vehicle owner’s manual as all typical  
vehicle usage not defined to be included in the severe usage schedule.  
8.2 SERVICE INTERVAL BY SCHEDULE  
The service intervals for engine related service are defined in Table 8.2 - 1 as a function of vehicle  
usage category, i.e. short trip/city usage or long trip/ highway usage.  
Table : 8.2 - I Routine Service Interval by Usage  
Item  
Schedule I  
(<8500 GVWR)  
Schedule II  
(<8500 GVWR)  
Schedule 1  
(>8500 GVWR)  
Schedule II  
(>8500 GVWR)  
Engine Oil and Filter 3000 miles/3 month 7500 miles/12months 3000 miles/3 month 7500 miles/12months  
Or on condition  
detected by oil  
quality monitoring  
system  
Or on condition  
detected by oil  
quality monitoring  
system  
Or on condition  
detected by oil  
quality monitoring  
system  
Or on condition  
detected by oil  
quality monitoring  
system  
Engine Coolant  
Air Cleaner Filter  
Spark Plug  
50000 miles  
30000 miles  
100000 miles  
100000 miles  
100000 miles  
50000 miles  
30000 miles  
100000 miles  
100000 miles  
100000 miles  
50000 miles  
24000 miles  
100000 miles  
100000 miles  
100000 miles  
50000 miles  
24000 miles  
100000 miles  
100000 miles  
100000 miles  
Engine Wire ASM  
Accessory Drive Belt  
9.0 DIAGNOSTICS  
Diagnosis shall be accomplished using industry standard electronic diagnosis tools such as Techline  
Equipment (Tech 1/Tech 2 / Tech XS / CAMS).  
10.0 OTHER AVAILABLE DOCUMENTS  
The Application engineer will supply all technical documents needed to support the application and  
validation process.  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
11.0 VALIDATION REQUIREMENTS  
11.1 GENERAL  
The validation of GM Powertrain units may follow a wide variety of validation procedures.  
GMPT will participate with the customer in establishing the validation procedure needed to validate  
the application of the V6 Gasoline Engine into the customer vehicle.  
11.2 METHODS  
When required, The GM Application and the Customer Release Engineer will determine a method of  
design validation from the four acceptable methods listed below.  
A: Validation by Analysis:  
1) Simulation of the product (or its functions) or manufacturing  
process and the specified conditions using mathematical  
representation (math models, algorithms, equations, etc.), in  
accordance with a procedure, and documenting the results  
to ensure that a particular requirement has been met.  
2) The generation of conclusions through the examination of  
known data to ensure that a particular requirement has been  
met.  
I: Validation by Inspection:  
Examination of the product or manufacturing process, in  
accordance with a procedure, and documenting specified  
physical characteristics to ensure that a particular requirement  
has been met.  
D: Validation by Demonstration:  
T: Validation by Test:  
Exercising the product or manufacturing process under specified  
conditions, in accordance with a procedure, and documenting  
the results to ensure that a particular requirement has been met.  
Exercising the product or manufacturing process under specified  
conditions, in accordance with a procedure, collecting  
quantitative data via instrumentation and documenting the  
results to ensure that a particular requirement has been met.  
11.3 VALIDATION DETAILS  
Inspection and testing will be required to demonstrate that each V6 Gasoline Engine application is  
adequate for the duty cycle and life demanded by the end user. This will take place as part of the initial  
release process, and for significant changes to either the engine, transmission or vehicle systems.  
Validation Methods of each application of the V6 4.3L Gasoline Engine will be applied at minimum to  
the following issues:  
11.3.1 Installation Review  
The installation of the engine shall be validated and verified by comparison with the engineering  
drawings created by vehicle manufacturer.  
11.3.2 Emissions Test  
To be negotiated between GM and Customer  
11.3.3 Cooling System Performance Test  
Cooling Subsystem Performance Test must be approved by the GM application engineer.  
11.3.4 Water Snow Inhalation Performance Test  
Test shall be performed to verify water and or snow can not be ingested by the engine.  
11.3.5 Design Review/ Mockup  
During the design installation process of the V6 Gasoline Engine into a vehicle, the GM  
Application Engineer will indicate those areas that need design validation prior to construction.  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
11.3.6 Underhood Temperature Measurements and Locations  
Locations and Results performed by vehicle manufacturer shall be supplied to GMPT Application  
Engineer  
11.3.14 On Road Vehicle Test  
This test will reflects performance requirements for speed, load, torque, power, and performance  
of cooling system.  
GMPT Application Engineer will provide vehicle level test specifications to the vehicle  
manufacturer.  
The vehicle manufacturer will execute physical test and provide test results approval by GMPT  
Application Engineer.  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
12.0 NOTES  
12.1  
ACRONYMS, ABBREVIATIONS, AND SYMBOLS  
adv  
A/F  
AIR  
ASTM  
API  
ATDC  
avg  
ACG  
advance  
Air -Fuel ratio  
CAD  
CFR  
COE  
Corr  
COV  
CR  
Computer Aided Design  
Cooperative Fuel Research  
Council of Expertise  
corrected  
coefficient of variation  
compression ratio  
effective compression ratio  
cylinder  
Air Injection Reaction  
American Society for Testing Materials  
American Petroleum Institute  
after top dead center  
average  
CReff  
Cyl  
Allied Component Group  
CEA  
CNG  
Change Engineering Authorization  
Compressed Natural Gas  
B
barometric pressure  
BMEP  
BP  
brake mean effective pressure  
brake power  
brake specific fuel  
brake specific hydrocarbons  
brake specific heat rejection  
brake specific Carbon Monoxide  
brake specific Particulate Mass  
brake specific NOx (oxides of nitrogen)  
before top dead center  
BSFC  
BSHC  
BSHR  
BSCO  
BSPM  
BSNOx  
BTDC  
D
Deg  
Dia  
density  
Degree  
diameter  
E
engine displacement  
Electronic Control Unit  
economy  
European Economic Community  
Early Fuel Evaporation  
efficiency  
Electronic Fuel Injection  
Exhaust Gas Recirculation  
Environmental Protection Agency  
Electronic Spark Control  
Exhaust  
N
N
N2  
NAO  
N/V  
NMEP  
NMOG  
No.  
polytropic compression coefficient  
Engine Speed  
ECM  
econ  
EEC  
EFE  
eff  
Nitrogen  
North American Operations  
Engine Speed/Vehicle Speed  
Net Mean Effective Pressure  
Non Methane Organic Gas  
number  
EFI  
EGR  
EPA  
ESC  
exh  
exp  
experimental  
Obs  
O/C  
OD  
observed  
Oxygen-Carbon ratio  
outside diameter  
FMEP  
FP  
Friction Mean Effective Pressure  
Friction Power  
FESM  
FMVSS  
Front End Sheet Metal  
Federal Motor Vehicle Safety Standards  
P
Power  
PCV  
PFI  
PMEP  
PN  
Positive Crankcase Ventilation  
Port Fuel Injection  
Pumping Mean Effective Pressure  
Part Number  
GM  
General Motors  
GMPT  
GMTG  
GPA  
General Motors Powertrain  
General Motors Truck Group  
Gas Processors Association Program  
Gross Vehicle Weight Rating  
PON  
PP  
Pump Octane Number  
Peak Pressure  
GVWR  
GMUTS General Motors Uniform Test Specifications  
PT  
PCM  
P/S  
Part Throttle  
Powertrain Control Module  
Power Steering  
GPH  
Gallons Per Hour  
HC  
H/C  
Hz  
hydrocarbon  
Hydrogen-Carbon ratio  
Hertz (frequency)  
PTO  
Power Take-Off  
QFD  
Quality Function Deployment  
IPTV  
IAC  
ID  
IMEP  
int  
IP  
ISC  
Initial Defects Per Thousand Vehicle  
Idle Air Control  
R
Torque Scale Arm  
Radial Aperture Tube  
revolution  
RAT  
Rev  
RLP  
RON  
RPO  
RTD  
inside diameter  
Indicated Mean Effective Pressure  
Intake  
Indicated Power  
Road Load Power  
Research Octane Number  
Regular Production Option  
Resistive Temperature Detector  
Idle Speed Control  
ISO  
KT  
Interl. Orgn. for Standardization  
Knock threshold  
RVP  
RPM  
Reid Vapor Pressure  
Revolutions Per Minute  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
L
stabilized dynamometer load  
Leanest Mixture for Best Torque  
Laminar Flow Element  
Liquefied Petroleum Gas  
Location of Peak Pressure  
VTS  
Vehicle Technical Specification  
LBT  
LFE  
LPG  
LPP  
VDP  
VCM  
VE  
WOT  
WVRM  
Vehicle Development Process (4-Phase)  
Vehicle Control Module  
Volumetric Efficiency  
Wide Open Throttle  
World Vehicle Regulation Manual  
MAP  
Manifold Absolute Pressure  
SAE  
Society of Automotive Engineers  
max  
MBT  
ME  
MEP  
m(a)  
maximum  
ser no.  
sg  
SI  
std  
SSTS  
serial number  
specific gravity  
International System of Units  
standard  
Subsystem Technical Specification  
Minimum Spark Advance for Best Torque  
Mechanical Efficiency  
Mean Effective Pressure  
air mass flow rate  
m(f)  
fuel mass flow rate  
MMEP motoring Mean Effective Pressure  
T
Torque  
MON  
MT  
MIL  
Motor Octane Number  
Motoring Torque  
Malfunction Indicator Lamp  
TBI  
TDC  
TPS  
TM  
Throttle Body Injection  
Top Dead Center  
Throttle Position Sensor  
Torque Management  
Test Work Order  
TWO  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
APPENDIX I  
Engine-Vehicle Definition Form  
UNITS  
VEHICLE PERFORMANCE  
REQUIREMENTS  
Maximum Speed on 1st Gear  
Maximum Speed on 2nd Gear  
Maximum Speed on 3rd Gear  
Maximum Speed on 4th Gear  
Maximum Speed on 5th Gear  
Maximum Speed on Highway  
mph  
mph  
mph  
mph  
mph  
Mph  
Body type  
Body Cx  
Body Width  
Body Height  
Body Length  
Body Frontal Area  
Ft  
Ft  
Ft  
Sq. ft  
Curb Weight  
Gross Weight  
Total weight  
Lbs  
Lbs  
Lbs  
Maximum Acceleration (0-60mph)  
Maximum Gradient  
%
CHASSIS  
Single Axle Single Speed Ratio  
Single Axle Double Speed - Low Ratio  
Single Axle Double Speed - High Ratio  
Tandem Axle Single Speed Ratio  
Tandem Axle Double Speed - Low Ratio  
Tandem Axle Double Speed - High Ratio  
Driveline Efficiency  
Single Axle Single Speed  
Single Axle Double Speed  
Tandem Axle Single Speed  
Tandem Axle Double Speed  
Wheelbase  
in  
Tire Specification  
Tire Footprint Development  
Tire Maximum Speed  
ft  
rpm  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
Engine-Vehicle Definition Form  
UNITS  
TRANSMISSION  
Manual transmission  
1st Gear Ratio  
2nd Gear Ratio  
3rd Gear Ratio  
4th Gear Ratio  
5th Gear Ratio  
6th Gear Ratio  
Automatic transmission  
1st Gear Ratio  
2nd Gear Ratio  
3rd Gear Ratio  
4th Gear Ratio  
5th Gear Ratio  
6th Gear Ratio  
Accessories  
Accessory #1:  
Accessory #1 Location:  
Accessory #1 Type Drive:  
Accessory #1 Hp required:  
Accessory #2:  
Accessory #2 Location:  
Accessory #2 Type Drive:  
Accessory #2 Hp required:  
Accessory #3:  
Accessory #3 Location:  
Accessory #3 Type Drive:  
Accessory #3 Hp required:  
Accessory #4:  
Accessory #4 Location:  
Accessory #4 Type Drive:  
Accessory #4 Hp required:  
Vehicle Power & Torque Requirements  
For Maximum Grade  
Rolling Power  
Requirements  
K W V (1+ f)/ 375 G W V / 375 (100)  
hp hp  
Grade Power  
Requirements  
Aerodyn. Power  
Total  
Power  
Requirements  
0.00256 C A V3  
hp  
Speed (MPH)  
Hp  
10  
15  
20  
25  
30  
35  
40  
45  
Power for maximum Grade  
Torque for maximum Grade  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
Engine-Vehicle Definition Form  
UNITS  
TRANSMISSION  
Manual transmission  
1st Gear Ratio  
2nd Gear Ratio  
3rd Gear Ratio  
4th Gear Ratio  
5th Gear Ratio  
6th Gear Ratio  
Automatic transmission  
1st Gear Ratio  
2nd Gear Ratio  
3rd Gear Ratio  
4th Gear Ratio  
5th Gear Ratio  
6th Gear Ratio  
Accessories  
Accessory #1:  
Accessory #1 Location:  
Accessory #1 Type Drive:  
Accessory #1 Hp required:  
Accessory #2:  
Accessory #2 Location:  
Accessory #2 Type Drive:  
Accessory #2 Hp required:  
Accessory #3:  
Accessory #3 Location:  
Accessory #3 Type Drive:  
Accessory #3 Hp required:  
Accessory #4:  
Accessory #4 Location:  
Accessory #4 Type Drive:  
Accessory #4 Hp required:  
Vehicle Power & Torque Requirements  
For Maximum Grade  
Rolling Power  
Requirements  
K W V (1+ f)/ 375 G W V / 375 (100)  
hp hp  
Grade Power  
Requirements  
Aerodyn. Power  
Total  
Power  
Requirements  
0.00256 C A V3  
hp  
Speed (MPH)  
Hp  
10  
15  
20  
25  
30  
35  
40  
45  
Power for maximum Grade  
Torque for maximum Grade  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
Engine-Vehicle Definition Form  
UNITS  
Vehicle Power & Torque Requirements  
For Maximum Speed  
Rolling Power  
Requirements  
Grade Power  
Requirements  
Aerodyn. Power  
Requirements  
Total  
Power  
Speed (MPH)  
K W V (1+ f)/ 375 G W V / 375 (100) 0.00256 C A V3  
hp  
hp  
hp  
hp  
10  
20  
30  
40  
50  
60  
70  
80  
90  
100  
Power for maximum Speed  
Torque for maximum Speed  
Vehicle Cooling System  
Radiator:  
Size:  
Make:  
Height:  
M/N # :  
Width:  
P/N:  
Thickness:  
Number of Rows of Tubes:  
Minimum Radiator Frontal Area  
Radiator Total Area  
Radiator Heat Evacuation Capacity  
Maximum Radiator Coolant Flow  
Maximum Radiator Peak Pressure  
Radiator Coolant inlet Size  
Radiator Coolant Outlet Size  
Surge Tank  
Fins/In.  
Sq. Meter  
Sq. Meter  
BTU/Min  
GPM  
bar  
mm  
mm  
Make:  
Capacity:  
Make:  
Capacity:  
Make:  
M/N # :  
Hose Size:  
M/N # :  
Hose Size:  
M/N # :  
Location:  
Location:  
Location:  
Deareation Tank  
Recovery Bottle  
Capacity:  
Hose Size:  
Low Coolant Sensor Type  
Low Coolant Sensor Location  
Describe Deareation System:  
Describe obstruction to water flow:  
Vehicle Heater Core:  
Auxiliary Heaters:  
Lines Sizes:  
Location:  
Make:  
Make:  
Type:  
Type:  
Location:  
Location:  
Shutoff or By-Pass Valve:  
Air Bleeds:  
Heater Hose Routing:  
Fan  
Fan Type:  
Fan Drive  
Sq. Meter  
Sq. Meter  
Make:  
M/N#:  
Max. Speed:  
Drive Ratio:  
Solid/Viscous  
Blades #  
Clutch:  
Suction / Blower Diameter  
Vehicle Electrical System  
Battery  
Make:  
M/N # :  
Location:  
Voltage  
Voltage  
Amperage  
Amperage  
Ambient  
Cold  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
Engine-Vehicle Definition Form  
UNITS  
Alternator  
Starter  
Make:  
Voltage  
Make:  
Power:  
M/N # :  
Amperage  
M/N # :  
Location:  
Nominal  
Nominal  
Location:  
Amperage:  
Vehicle Oil System  
Remote Filter:  
Type:  
Capacity:  
Location & Measured height relative to  
bottom of cylinder block  
Oil Radiator Capacity  
Radiator Number of Rows  
Radiator Number of Tubes  
Minimum Radiator Frontal Area  
Radiator Total Area  
Radiator Heat Evacuation Capacity  
Maximum Radiator Coolant Flow  
Maximum Radiator Peak Pressure  
Radiator Coolant inlet Size  
Radiator Coolant Outlet Size  
Sq. Meter  
Sq. Meter  
BTU/Min  
GPM  
bar  
mm  
mm  
Vehicle Fuel System  
Fuel Tank  
Fuel Lines Inlet  
Fuel Lines Return  
Height of Fuel Tank to Fuel Pump  
Fuel Tank Cap Relief Pressure  
Fuel Supply Pump  
Type  
Material:  
Size:  
Size:  
Type:  
Length;  
Length;  
Capacity:  
Material:  
Material:  
Make:  
Pressure:  
Flow:  
Inlet Restriction @ Pump  
Additional Comments  
Air System  
Air Cleaner  
Cleaner location  
Make:  
Size:  
Type:  
Length:  
Model:  
Material:  
Air Inlet Restriction  
@FL/NL:  
Vehicle Exhaust System  
Type : Single/Dual Pipe  
Muffler:  
Muffler/ Pipe Connection:  
Catalytic Converter  
Size:  
Size:  
Location:  
Size:  
@FL/NL:  
@FL/NL:  
Material:  
Material:  
Flex / Solid:  
Material:  
Location:  
Location:  
Make:  
Make:  
Make:  
Exhaust Back Pressure  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
File: c:\data\manuales\v6-truck\am43v6#3.doc  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
PREFACE  
This document will assist the reader in the application of the 4.3L V6 90 Degree Engine to the vehicle.  
It gives an overview of the engine, its features, as well as focus on the systems, subsystems and  
attachments that interface between the engine and the vehicle.  
The performance of the 4.3L V6 90 Degree Engine is dependent on the design and processing of the  
interface systems and their components.  
Definitions:  
The number between bracket shows the Specification level.  
VTS: Vehicle Technical Specification. Level (1) SSTS.  
Powertrain SSTS: Powertrain Subsystem Technical Specification. Level (2) SSTS.  
Composed of Engine, Transmission and Controls, Similar to the other NAO Major Technical  
Subsystems, like Electrical, HVAC, Chassis, Body, etc.  
Engine SSTS: Engine Subsystem Technical Specification. Level (3) SSTS.  
Transmission SSTS: Transmission Subsystem Technical Specification. Level (3) SSTS.  
Controls SSTS: Controls Subsystem Technical Specification. Level (3) SSTS.  
Cylinder Head SSTS: Cylinder Head Subsystem Technical Specification. Level (4) SSTS.  
Piston CTS: Piston Component Technical Specification. Level (5) SSTS.  
ACE: Assistant Chief Engineer, AE: Application Engineer, DRE: Design Release Engineer, PTVSE:  
Powertrain Vehicle System Engineer.  
The Word Subsystem is used in this context to indicate that a System Level (2) is part of a major System  
Level (1).  
The diagram 1.1 - I shows the scope of this specification with a dot line around the subsystems in which  
it place precedence.  
Diagram 1.1-I Powertrain SSTS scope of work  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
GM Powertrain needs a thorough understanding of each application for the 4.3L V6 90 Degree Engine,  
including for example, vehicle mass, transmission performance details, vehicle speed and grade as well  
as vehicle cooling and air intake capabilities.  
The OEM customer shall submit a completed “ Model Definition Form”, supplied by GM Powertrain at the  
start of each project or equivalent “ Vehicle Powertrain Technical Requirement Specification” for each  
project.  
A sample form of the former appears as a supplement to this manual. (See Appendix I)  
This data from the Model Definition Form, and the requirements contained within this manual, will be  
used to generate an agreed specification for the complete 4.3L V6 90 Degree Engine.  
All the dimensions and values in this manual are for reference only.  
Refer to the appropriate 4.3L V6 90 Degree Engine installation drawing(s) for definitive information.  
The following table summarizes the organization of the document.  
Section  
Comments  
1.0 Introduction  
2.0 Product Summary  
Summarizes the Product Information, Provides  
Feature Location Illustrations, and Characterizes  
the Engine Content as Delivered.  
3.0 Major System and Interface Descriptions  
Provides the “context” the Engine Operates  
Within.  
4.0 Vehicle Mounting and Packaging  
5.0 Detailed Performance Description  
Details Mounting and Packaging.  
Provides Details on the Performance of the  
Engine as an Overall System.  
6.0 Operating Environment  
7.0 Recommended Usage Constraints  
8.0 Quality, Reliability, and Durability  
9.0 Service Requirements  
10.0 Diagnostics  
Details the Intended Operating Environment.  
Provides Cautions and Limits for Intended Usage.  
Details Design Intent QRD Performance.  
Details Service Intervals and Service Parts.  
Details Supported Diagnostics and Procedures  
Provides References to Related Documentation.  
Details Validation processes  
11.0 Other Available Documents  
12.0 Validation Requirements  
13.0 Notes  
Defines Terms used in Manual.  
Appendix I  
Engine – Vehicle Definition Form  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
TEMPLATE OWNERS  
Name  
Gasoline 4.3L V6 90 Degree Team :  
Date Approved  
Title/Affiliation  
Ron Meegan  
Frank Tenkel  
Luis Nespolo  
Jeremy Worm  
GMPT Total Integration Engineer L35  
GMPT Application Engineering  
GMPT Application Engineering  
GMPT System Engineering  
REVISION LOG  
Revision  
Date  
Document  
Revision  
Description  
Paragraphs  
Affected  
ID  
7/21/00  
Engine  
Application Manual  
2001  
Revision 0 - Document Issued  
All  
4.3L V6 90Degree  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
TABLE OF CONTENTS  
1.0 INTRODUCTION  
............................................................................................................................1  
2.0 PRODUCT SUMMARY........................................................................................................................1  
2.1 APPEARANCE1  
2.2 FEATURES  
1
2.3 PRODUCT SPECIFICATION SUMMARY ...................................................................................2  
2.3.1 SPECIFICATION .............................................................................................................2  
2.3.2 Fuel Requirements ..........................................................................................................6  
2.3.2 Performance ....................................................................................................................7  
2.3.2.1 Engine Power & Torque.....................................................................................7  
2.4 FEATURE LOCATION ILLUSTRATIONS....................................................................................7  
2.5 CONFIGURATION AS SHIPPED ..............................................................................................10  
2.5.1 Engine as Shipped ........................................................................................................10  
2.6 IDENTIFICATION AND MARKING ............................................................................................10  
2.6.1 VIN Identification Labeling.............................................................................................10  
2.6.2 Emissions Certification Labeling ...................................................................................10  
2.6.3 Engine Identification - Broadcast Codes ...................................................................... 10  
2.6.3.1 Engine Option Description................................................................................11  
2.6.3.2 Engine Broadcast Codes & Part Numbers.......................................................12  
3.0 GMPT SYSTEM INTERFACES.........................................................................................................13  
3.1 INTERNAL INTERFACES TO GMPT ........................................................................................13  
3.1.1 Engine Interface to transmission...................................................................................13  
3.1.1.1 Automatic Transmission ...................................................................................13  
3.1.1.2 Manual Transmission and Clutch .....................................................................13  
3.1.2 Engine Interface to PCM ( Vehicular and Marine/Industrial Application) .....................15  
3.1.2.1 Inputs from the Engine to the PCM ..................................................................15  
3.1.2.2 Outputs from PCM to the Engine .....................................................................15  
3.1.3 PCM Interface to Transmission .....................................................................................15  
3.1.3.1 Input Algorithm:.................................................................................................15  
3.1.3.2 Shift Control Algorithm:.....................................................................................15  
3.1.3.3 Shift Quality Algorithm: .....................................................................................15  
3.1.3.4 TCC Control Algorithm .....................................................................................16  
3.1.3.5 Inputs from Transmission to PCM ....................................................................16  
3.1.3.6 Output to the Transmission from PCM .............................................................16  
3.1.4 PCM Interface to Vehicle...............................................................................................16  
3.1.4.1 External Inputs of the Engine ...........................................................................16  
3.1.4.2 Output to the Vehicle: .......................................................................................16  
3.1.5a PCM Pin Out and Pin In – Truck Applications...............................................................17  
3.1.5b PCM Pin Out and Pin In – Marine and Industrial Applications......................................20  
3.1.6 Engine interface to exhaust...........................................................................................22  
3.1.6.1 Content .............................................................................................................22  
3.1.6.2 Back Pressure ..................................................................................................24  
3.1.6.3 Packaging .........................................................................................................24  
3.1.6.4 Exhaust Gas Recirculation (EGR)....................................................................24  
3.1.6.5 Secondary Air ...................................................................................................24  
3.1.7 Engine Interface to Cruise Control ............................................................................... 25  
3.1.8 Accelerator Pedal ......................................................................................................... 25  
3.1.9 Engine to Evaporative Fuel System ..............................................................................25  
3.1.10 Accessory Drive System ...............................................................................................26  
3.1.11 Standard Accessory Descriptions .................................................................................26  
3.1.12 Cooling Fan .................................................................................................................. 26  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
3.1.13 Alternator .......................................................................................................................26  
3.1.14 Power Steering Pump ...................................................................................................26  
3.1.15 AC Compressor .............................................................................................................26  
3.1.16 Crank Shaft Nose Load .................................................................................................26  
3.2 INTERFACES WITH VEHICLE SUBSYSTEMS........................................................................28  
3.2.1a GMPT interface with Electrical Supply System-Truck Application ................................28  
3.2.1b GMPT interface with Electrical Supply System- Marine and Industrial Application ......46  
3.2.2 GMPT interface with Electrical Starting System ...........................................................48  
3.2.3 GMPT interface with CHASSIS BRAKE ABS System ..................................................48  
3.2.4 GMPT Interface with HVAC System..............................................................................49  
3.2.4.1 Fan Cooling System .........................................................................................49  
3.2.4.2 Coolant Properties............................................................................................50  
3.2.4.3 Coolant Radiator (Recommended Minimum Values) .......................................50  
3.2.4.3.1 Heater Performance .........................................................................50  
3.2.4.3 Operating Conditions and Measures................................................................51  
3.2.4.3.1 Heat Rejection..................................................................................51  
3.2.4.3.2 System Pressure ..............................................................................51  
3.2.4.3.3 Coolant Operating Temperatures .................................................... 52  
3.2.4.3.4 Flow Rates .......................................................................................52  
3.2.4.3.5 Coolant Fill .......................................................................................53  
3.2.4.4 Coolant and Heater Subsystem Descriptions ..................................................54  
3.2.4.4.1 Coolant Inlet- Water Pump Inlet Restriction.....................................54  
3.2.4.4.2 Coolant Outlet- .................................................................................54  
3.2.4.4.3 Heater Feed- ....................................................................................54  
3.2.4.4.4 Heater Return...................................................................................54  
3.2.4.4.5 Coolant Hose Material......................................................................54  
3.2.4.4.6 Hose Clamps....................................................................................54  
3.2.4.4.7 Thermostat .......................................................................................54  
3.3.1 GMPT Interface with CHASSIS Fuel System................................................................55  
3.3.2 GMPT interface with Air Induction System....................................................................57  
3.3.2.1 Air Requirement................................................................................................57  
3.3.2.2 Air Flow Path ....................................................................................................57  
3.3.2.4 Temperature Rise .............................................................................................58  
3.3.2.4 Filtration Requirements ....................................................................................58  
3.3.3 GMPT Interface with Oil Cooling Subsystem ................................................................59  
3.3.3.1 Oil Cooler Requirements - ............................................................................... 59  
3.3.4 GMPT Interface with Chassis Engine Mountings..........................................................60  
3.3.4.1 Engine Packaging Dimensions.........................................................................60  
3.3.4.2 Recommended Installation Angles ...................................................................60  
3.3.4.2.1 Recommended Side View Angle.......................................................60  
3.3.4.2.2 Recommended Front View Angle.................................................... 60  
3.3.4.2.3 Recommended Plan View Angle......................................................60  
3.3.4.3 Rear Face of Block Configuration ....................................................................61  
3.3.4.4 Ground Clearance ............................................................................................61  
4.0 DETAILED PERFORMANCE DESCRIPTION ..................................................................................63  
4.1 EXHAUST AND EVAPORATIVE EMISSIONS ..........................................................................63  
4.1.1 EPA Certification............................................................................................................63  
4.1.2 CARB Certification ........................................................................................................63  
4.1.3 Other Regulations ........................................................................................................63  
4.1.3.1 Onboard Diagnostics ........................................................................................64  
4.1.3.2 Applicability.......................................................................................................64  
4.1.3.3 Requirements ...................................................................................................64  
Contact:Luis Nespolo - (248) 857-1558  
Printed: 8/15/00  
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ENGINE APPLICATION MANUAL  
Gasoline 4.3L V6 90 Degree  
GM Powertrain  
Revised: 08/15/2000  
5.0 OPERATING ENVIRONMENT ......................................................................................................... 65  
5.1 ROADWAY GRADES, SURFACES AND HAZARDS................................................................65  
5.2 CRITICAL COMPONENT TEMPERATURE LIMITS .................................................................65  
5.3 HUMIDITY, RELATIVE HUMIDITY (SEE CHART 5.2-I)............................................................66  
5.4 PRESSURE (SEE CHART 5.2-I)...............................................................................................66  
5.5 UNDERHOOD/UNDERBODY CAR WASH...............................................................................66  
5.6 FORDING ..................................................................................................................................66  
5.7 SAND AND DUST EXPOSURE ................................................................................................66  
5.8 GRAVEL AND STONE CHIP EXPOSURE ............................................................................... 66  
5.9 OZONE EXPOSURE .................................................................................................................66  
5.10 ELECTROMAGNETIC ENVIRONMENT...................................................................................66  
5.11 SHOCK, IMPACT.......................................................................................................................66  
5.12 VIBRATION POWERTRAIN BENDING.....................................................................................67  
6.0 RECOMMENDED USAGE CONSTRAINTS.....................................................................................69  
6.1 ENGINE PRE-CONDITIONING PRIOR TO NORMAL OPERATION........................................69  
6.2 ENGINE SPEED........................................................................................................................69  
6.2.2 Maximum Start Time. ....................................................................................................69  
6.2.3 Idle Quality (Speed and Stability)..................................................................................69  
6.2.3.1 Idle Stability .......................................................................................................69  
6.2.3.2 Idle Speed .........................................................................................................69  
6.3 ENGINE LOAD ..........................................................................................................................71  
6.4 OIL & CRANKCASE VENTILATION..........................................................................................72  
6.5 COOLANT:.................................................................................................................................72  
6.6 COMBUSTION CONTROL........................................................................................................72  
7.0 QUALITY, RELIABILITY, & DURABILITY (QRD) ............................................................................72  
7.1 QUALITY AND RELIABILITY ....................................................................................................72  
7.2 DURABILITY - USEFUL LIFE....................................................................................................72  
8.0 SERVICE REQUIREMENTS .............................................................................................................73  
8.1 MAINTENANCE SCHEDULES (SEVERE USAGE AND NON SEVERE USAGE).................. 73  
8.1.1 Maintenance Schedules - Severe Usage (Schedule I) .................................................73  
8.1.2 Maintenance Schedule - Non Severe or Long Trip/Highway Usage (Schedule II) .......73  
8.2 SERVICE INTERVAL BY SCHEDULE ......................................................................................73  
9.0 DIAGNOSTICS ..................................................................................................................................73  
10.0 OTHER AVAILABLE DOCUMENTS.................................................................................................73  
11.0 VALIDATION REQUIREMENTS .......................................................................................................75  
11.1 GENERAL..................................................................................................................................75  
11.2 METHODS.................................................................................................................................75  
11.3 VALIDATION DETAILS..............................................................................................................75  
11.3.1 Installation Review ........................................................................................................75  
11.3.2 Emissions Test................................................................................................................75  
11.3.3 Cooling System Performance Test .................................................................................75  
11.3.4 Water Snow Inhalation Performance Test ......................................................................75  
11.3.5 Design Review/ Mockup .................................................................................................75  
11.3.6 Underhood Temperature Measurements and Locations ................................................76  
11.3.14 On Road Vehicle Test...................................................................................................76  
12.0 NOTES...............................................................................................................................................77  
12.1 ACRONYMS, ABBREVIATIONS, AND SYMBOLS ...................................................................77  
Contact:Luis Nespolo - (248) 857-1558  
Printed: 8/15/00  
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