GM Service Manual Online
For 1990-2009 cars only
Figure 1:

Engine Composite View (3100 LG.8)


Object Number: 371074  Size: LF
(1)Fuel Injector 16-Way Harness Connector
(2)Manifold Absolute Pressure (MAP) Sensor
(3)Exhaust Gas Recirculation (EGR) Valve
(4)Throttle Position (TP) Sensor
(5)Throttle Body
(6)Fuel Pressure Regulator
(7)Engine Oil Pressure Switch
(8)Knock Sensor (KS)
(9)24X CKP Sensor Harness Connector
(10)Positive Crankcase Ventilation (PCV) Valve
(11)Camshaft Position (CMP) Sensor Harness Connector
(12)Fuel Rail
(13)Upper Intake Manifold
Figure 2:

Engine Composite View (3100 LG.8)


Object Number: 531383  Size: LF
(1)Upper Intake Manifold
(2)Manifold Absolute Pressure (MAP) Sensor
(3)Secondary Ignition (Spark Plug) Wires
(4)Ignition Coil/Module Assembly
(5)Heated Oxygen Sensor(HO2S)
(6)7X Crankshaft Position (CKP) Sensor
(7)Exhaust Gas Recirulation (EGR)
(8)Throttle Position (TP) Sensor
(9)Fuel Feed and Return Pipes
(10)Throtle Body
(11)Idle Air Control (IAC)
(12)Positive Crankcase Ventilation (PCV)
(13)EVAP Purge Valve
(14)Camshaft Position (CMP) Sensor Harness Connector
Figure 3:

Top Front of Engine (3100 LG.8)


Object Number: 374674  Size: LF
(1)Mass Air Flow (MAF) Sensor
Figure 4:

Top Left Side of Engine (3100 LG8)


Object Number: 531485  Size: LF
(1)Exhaust Gas Recirculation (EGR) Valve
(2)Fuel Feed and Return Lines
(3)Idle Air Control (IAC) Valve
(4)Evaporative Emission (EVAP) Canister Purge Valve
Figure 5:

Heated Oxygen Sensor 2 (HO2S2)


Object Number: 181135  Size: LF
(1)Heated Oxygen Sensor 2 (HO2S2)
Figure 6:

Multi Way Fuel Injector Harness Connector, Fuel Pressure Regulator, PCV Valve


Object Number: 762218  Size: MF
(1)Fuel Injector Harness 16 Way Connector (C130)
(2)Fuel Pressure Regulator
(3)Positive Crankcase Ventilation (PCV) Tube
Figure 7:

A/C Compressor -- Lower RH Front of Engine (3100 LG8)


Object Number: 327373  Size: LF
(1)Crankshaft Position (CKP) Sensor A
(2)Knock Sensor (KS)
(3)Oil Pressure Switch
(4)Fusible Links
(5)A/C Compressor Clutch Coil Harness
Figure 8:

Engine Oil Level Switch


Object Number: 181102  Size: SF
(1)Engine Oil Level Switch
Figure 9:

Trans Range Switch, Engine Ground


Object Number: 181137  Size: MF
(1)Trans Range Switch
(2)Engine Grounds
Figure 10:

Vehicle Speed Sensor (VSS)


Object Number: 181104  Size: MF
(1)Vehicle Speed Sensor (VSS)