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.
2007 Hummer H3 L5-3.7LFACTORY OEM SERVICE PROCEDURE
Ignition Coil: Service and Repair
Ignition Coil Replacement
Removal Procedure
1. Remove the air cleaner resonator and outlet duct.
2. Disconnect the ignition coil connectors (3) from the ignition coils (4).
3. Remove the ignition coil bolts.
4. Remove the ignition coils from the camshaft cover.
Installation Procedure
Important: Ensure the ignition coil seals are properly seated to the camshaft cover.
1. Install the ignition coils into the camshaft cover.
Notice: Refer to Fastener Notice.
2. Install the ignition coil bolts.
Tighten the bolts to 10 N.m (89 lb in).
3. Connect the ignition coil connectors (3) to the ignition coils (4).
4. Install the air cleaner resonator and outlet duct.
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.