Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

2003 Hummer H2 V8-6.0LFACTORY OEM SERVICE PROCEDURE

Ignition Coil: Service and Repair

IGNITION COIL(S) REPLACEMENT

REMOVAL PROCEDURE

1. Disconnect the spark plug wires at the ignition coils.

2. Disconnect the ignition coil harness connector.

3. Remove the ignition coil mounting bolts.

4. Remove the ignition coil.

INSTALLATION PROCEDURE

1. Install the ignition coil to the bracket.

NOTE: Refer to Fastener Notice in Service Precautions.

2. Install the ignition coil mounting bolts.

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

3. Connect the ignition coil harness connector.

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

Chapter Navigation

Return to Chapter: Ignition Coil

Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.