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 H2 V8-6.0LFACTORY OEM SERVICE PROCEDURE
Ignition Cable: Service and Repair
Spark Plug Wire Replacement
Removal Procedure
1. Disconnect the spark plug wire at each spark plug.
* Twist each spark plug 1/2 turn.
* Pull only on the boot in order to remove the wire from each spark plug.
2. Disconnect the spark plug wire from the ignition coil.
* Twist each spark plug boot 1/2 turn.
* Pull only on the boot in order to remove the wires from the ignition coil.
Spark Plug Wire Length V8
* The Melco(R), square design, uses a spark plug wire (1) that is 145 mm (5.70 in) length cable seal to cable seal.
* The Delphi(R), round design uses a spark plug wire (2) that is 110 mm (4.30 in) length cable seal to cable seal.
* There are 2 different manufacturers for the ignition coils. the Melco(R) (1) square design, and the Delphi(R) (2) round design. These 2 coils use 2 different spark plug wire, and mounting brackets.
* Melco(R), square design, coil mounting bracket (1).
* Delphi(R), round design, coil mounting bracket (2).
Installation Procedure
1. Install the spark plug wires at the ignition coil.
2. Install the spark plug wire to each spark plug.
3. Inspect the wires for proper installation:
* Push sideways on each boot in order to inspect the seating.
* Reinstall any loose boot.
Factory Service Tools
Use the Manual With the Right Hardware
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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.
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