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 MANUALSCHEVROLET2004EXPRESS 2500 2WD V8-6.0L VIN UREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTIGNITION SYSTEMSPARK PLUGSERVICE AND REPAIR
2004 Chevrolet Express 2500 2WD V8-6.0L VIN U
Spark Plug: Service and Repair
2004 Chevrolet Express 2500 2WD V8-6.0L VIN USECTION Service and Repair
Spark Plug Replacement
Removal Procedure
1. Remove the spark plug wires.
2. Loosen each spark plug 1 or 2 turns.
3. Brush or air blast away any dirt from around the spark plugs.
4. Remove the spark plugs 1 at a time. Place each plug in a tray marked with the corresponding cylinder numbers.
Installation Procedure
1. Inspect each spark plug gap. Adjust each plug as needed.
Specification
Spark plug gap: 1.01 mm (0.040 inch)
2. Hand start the spark plugs in the corresponding cylinders.
Notice:
3. Tighten the spark plugs.
Tighten
- For used heads tighten the spark plugs to 15 Nm (11 lb ft).
- For new aluminum heads tighten the spark plugs to 20 Nm (15 lb ft).
- For new iron heads, tighten the spark plugs to 30 Nm (22 lb ft).
4. Install the spark plug wires.
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.