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