Hummer H2. Manual - part 1716

Fig. 68: Knock Sensor Wire Harness 
Courtesy of GENERAL MOTORS CORP. 

1. Remove the intake manifold. Refer to Intake Manifold Replacement .  

2. Gently pry up the rubber covers.  

3. Disconnect the knock sensor electrical connectors. 

 

2004 Hummer H2 

2004 ENGINE Engine Mechanical - 4.8L, 5.3L, and 6.0L - Hummer H2

  

Fig. 69: Knock Sensors 
Courtesy of GENERAL MOTORS CORP. 

4. Remove the knock sensors. 

 

2004 Hummer H2 

2004 ENGINE Engine Mechanical - 4.8L, 5.3L, and 6.0L - Hummer H2

  

Fig. 70: Engine Valley Cover & Gasket 
Courtesy of GENERAL MOTORS CORP. 

5. Remove the engine valley cover bolts.  

6. Remove the engine valley cover and gasket.  

7. Discard the old gasket. 

 

2004 Hummer H2 

2004 ENGINE Engine Mechanical - 4.8L, 5.3L, and 6.0L - Hummer H2

  

Fig. 71: Knock Sensor Oil Seals & Cover 
Courtesy of GENERAL MOTORS CORP. 

8. Remove the knock sensor oil seals (1) from the cover (2).  

9. Clean and inspect the engine valley cover. Refer to Engine Valley Cover Cleaning and Inspection .  

Installation Procedure 

IMPORTANT: All gasket surfaces should be free of oil or other foreign material during 

assembly.

 

2004 Hummer H2 

2004 ENGINE Engine Mechanical - 4.8L, 5.3L, and 6.0L - Hummer H2