Hummer H2. Manual - part 1470

Fig. 157: Ignition Coil Mounting Bolts 
Courtesy of GENERAL MOTORS CORP. 

2. Install the ignition coil mounting bolts. 

Tighten: Tighten the ignition coil mounting bolts to 8 N.m (71 lb in).

NOTE:

Refer to Fastener Notice in Cautions and Notices.

 

2004 Hummer H2 

2004 ENGINE PERFORMANCE Engine Controls (Introduction) - 4.8L, 5.3L, and 6.0L - Hummer H2

  

Fig. 158: Ignition Coil Harness Connector 
Courtesy of GENERAL MOTORS CORP. 

3. Connect the ignition coil harness connector. 

 

2004 Hummer H2 

2004 ENGINE PERFORMANCE Engine Controls (Introduction) - 4.8L, 5.3L, and 6.0L - Hummer H2

  

Fig. 159: Spark Plug Wires & Ignition Coils 
Courtesy of GENERAL MOTORS CORP. 

4. Connect the spark plug wires at the ignition coils.  

SPARK PLUG WIRE INSPECTION 

Spark plug wire integrity is vital for proper engine operation. A thorough inspection will be necessary to 
accurately identify conditions that may affect engine operation. Inspect for the following conditions: 

z

Correct routing of the spark plug wires-Incorrect routing may cause cross-firing.  

z

Any signs of cracks or splits in the wires.  

z

Inspect each boot for the following conditions: 

{

Tearing  

 

2004 Hummer H2 

2004 ENGINE PERFORMANCE Engine Controls (Introduction) - 4.8L, 5.3L, and 6.0L - Hummer H2

  

{

Piercing  

{

Arcing  

{

Carbon tracking  

{

Corroded terminal  

If corrosion, carbon tracking or arcing are indicated on a spark plug wire boot or on a terminal, replace the wire 
and the component connected to the wire. 

SPARK PLUG WIRE REPLACEMENT 

Removal Procedure 

Fig. 160: Spark Plug Wire & Boot 
Courtesy of GENERAL MOTORS CORP. 

1. Disconnect the spark plug wire at each spark plug. 

 

2004 Hummer H2 

2004 ENGINE PERFORMANCE Engine Controls (Introduction) - 4.8L, 5.3L, and 6.0L - Hummer H2