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 56 (ENGINE CONTROLS - TROUBLE SHOOTING - NO CODES - 2.2L)SYMPTOMSBACKFIRESIGNITION SYSTEM
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6
Ignition System
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Ignition System
WARNING: This page is about a different car, the 2003 Pontiac Sunfire, 2003 Pontiac Grand Am, 2003 Oldsmobile Alero, and 2003 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.
- To properly check the spark plugs or to correct a condition, refer to the following procedures:
- Ignition System Specifications. Go to IGNITION SYSTEMS in SERVICE & ADJUSTMENT SPECIFICATIONS - CAVALIER & SUNFIRE article or IGNITION SYSTEMS in SERVICE & ADJUSTMENT SPECIFICATIONS - ALERO, GRAND AM & MALIBU article.
- Spark Plug Inspection. Go to SPARK PLUGS under IGNITION SYSTEMS in SYSTEM & COMPONENT TESTING - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article.
- Spark Plug Replacement. See appropriate REMOVAL & INSTALLATION article.
- Remove spark plugs and check for correct heat range, wet plugs, cracks, wear, improper gap, burned electrodes, heavy deposits and verify that the spark plugs are of the correct type.
- Check for proper ignition voltage output with the HEI Spark Tester (J 26792), or equivalent.
- An improper spark plug gap will cause a driveability condition. Gap the spark plugs using a wire gauge gap tool.
- Determine the cause of the fouling before replacing the spark plugs.
- Check for damaged or misaligned spark plug boots.
- Check the Ignition Control Module (ICM) module for proper ground connection.
- Monitor the MISFIRE CURRENT COUNTERS while driving the vehicle in the conditions that the symptom occurred. If a misfiring cylinder can be located, use the DTC P0300 diagnostic procedures for diagnosis. Go to DTC P0300: ENGINE MISFIRE DETECTED under DIAGNOSTIC TESTS in SELF-DIAGNOSTICS - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE - GASOLINE article.
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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.