Chevrolet Silverado / GMC Sierra. Service manual — part 251

Removal Procedure

1. Remove the throttle body. Refer to Throttle Body Assembly Replacement .

2. Remove the fuel injectors. Refer to Fuel Injector Replacement .

Fig. 55: View Of MAP Sensor & Knock Sensor Electrical Connectors
Courtesy of GENERAL MOTORS CORP.

3. Disconnect the following electrical connectors:

Manifold absolute pressure (MAP) sensor (1)

Knock sensor (2)

IMPORTANT: The intake manifold, throttle body, fuel rail, and injectors

may be removed as an assembly. If not servicing the
individual components, remove the manifold as a complete
assembly.

2008 Hummer H2

2008 ENGINE Engine Mechanical - 6.2L - H2

4. Remove the knock sensor harness electrical connector from the intake manifold.

5. Set the electrical harness aside.

Fig. 56: View Of Manifold Absolute Pressure (MAP) Sensor
Courtesy of GENERAL MOTORS CORP.

6. Remove the MAP sensor (1) from the intake manifold.

2008 Hummer H2

2008 ENGINE Engine Mechanical - 6.2L - H2

Fig. 57: View Of EVAP Purge Solenoid Vent Tube
Courtesy of GENERAL MOTORS CORP.

7. Remove the evaporative emission (EVAP) purge solenoid vent tube by performing the

following:

1. Remove the EVAP tube end (2) from the solenoid (1).

2. Squeeze the EVAP pipe quick connect fitting (3) retainer together.

3. Remove the EVAP tube end (3) from the vapor pipe.

2008 Hummer H2

2008 ENGINE Engine Mechanical - 6.2L - H2

Fig. 58: View Of EVAP Purge Solenoid Bolt, Solenoid & Isolator
Courtesy of GENERAL MOTORS CORP.

8. Remove the EVAP purge solenoid bolt (2), solenoid (3), and isolator (1) from the intake

manifold.

2008 Hummer H2

2008 ENGINE Engine Mechanical - 6.2L - H2