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.

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HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G2500, VAN CARGO, 6.6 6REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 2114 (ENGINE CONTROL SYSTEM & FUEL SYSTEM - HYBRID (HP2) 6.0L (LZ1) - REPAIR INSTRUCTIONS)REPAIR INSTRUCTIONSSPARK PLUG REPLACEMENTINSTALLATION PROCEDURE

2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6

Installation Procedure

2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Installation Procedure

WARNING: This page is about a different car, the 2010 GMC Sierra and 2010 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: View Of Spark Plug

Courtesy of GENERAL MOTORS CORP.

Correctly position the spark plug washer.
Inspect the spark plug gap. Adjust the gap as needed. Refer to Ignition System Specifications
Hand start the spark plug in the corresponding cylinder.

CAUTION: Refer to Fastener Caution .

Tighten the spark plug.
Tighten: Tighten the plug to 15 N.m (11 lb ft).

Fig 2: View of Spark Plug Wires

Courtesy of GENERAL MOTORS CORP.

Install the spark plug wire to the spark plug.
Inspect the spark plug wire for proper installation:
1. Push sideways on each boot in order to inspect the seating.
2. Reinstall any loose boot.
If a right side spark plug(s) was replaced, install the right front wheelhouse liner. Refer to Front Wheelhouse Liner Replacement - Right Side (Chevrolet) or Front Wheelhouse Liner Replacement - Right Side (GMC) .
If a right side spark plug(s) was replaced, perform the service reconnect. Refer to High Voltage Enabling .

RENDER: 1.0x

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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.