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HOMESERVICE MANUALSCHEVROLET2004AVALANCHE 2500 2WD V8-8.1L VIN GREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTIGNITION SYSTEMSPARK PLUGSERVICE AND REPAIR
2004 Chevrolet Avalanche 2500 2WD V8-8.1L VIN G

Spark Plug: Service and Repair

2004 Chevrolet Avalanche 2500 2WD V8-8.1L VIN GSECTION Service and Repair


SPARK PLUG REPLACEMENT

REMOVAL PROCEDURE




1. Remove the spark plug wire.
2. Loosen the spark plug 1 or 2 turns.
3. Brush or using compressed air, blow away any dirt from around the spark plug.
4. Remove the spark plug. If removing more than one plug, place each plug in a tray marked with the corresponding cylinder.

INSTALLATION PROCEDURE




1. Correctly position the spark plug washer.
2. Inspect the spark plug gap. Adjust the gap as needed.

Spark plug gap: 1.524 mm (0.060 in)

3. Hand start the spark plug in the corresponding cylinder.

NOTE: Refer to Fastener Notice in Service Precautions.

4. Tighten the spark plug.
- Tighten the plug to 20 N.m (15 lb ft) for USED heads.
- Tighten the plug to 30 N.m (22 lb ft) for NEW heads.
5. Install the spark plug wire.
RENDER: 1.0x

NO RELATED

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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.