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 MANUALSCHEVROLET2001CHEVY EXPRESS G2500, VAN CARGO EXTENDED, 5.7 R, L31/KL8REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 246 (ENGINE CONTROLS TROUBLESHOOTING - NO CODES - 3.8L)SYMPTOMSENGINE BACKFIRESIGNITION SYSTEM
2001 Chevrolet Chevy Express G2500, Van Cargo Extended, 5.7 R, L31/KL8
Ignition System
2001 Chevrolet Chevy Express G2500, Van Cargo Extended, 5.7 R, L31/KL8SECTION Ignition System
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2003 Pontiac Grand Prix, 2003 Pontiac Bonneville, 2003 Chevrolet Monte Carlo, 2003 Chevrolet Impala, and 2003 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
- Check for proper ignition voltage output using the following steps:
- Clip Spark Tester (J 26792) to engine ground.
- Connect one end of a spark plug wire to the spark tester. Connect the other end of the spark plug wire to the coil being tested.
- Connect another spark plug wire between the remaining tower of the coil being tested and ground.
- Crank the engine while observing the spark tester. A crisp Blue spark should be observed.
- Repeat procedure for each coil.
- If spark is not present at the coils, inspect for the following conditions:
- Coils - Cracks, carbon tracking/arcing, or a secondary resistance value outside the specified coil resistance range of 5-8 k/ohms.
- Spark Plug Wires - Signs of arcing/cross firing, cracks, carbon tracking, plug boot damage, pinched, improper routing, or a resistance value outside the specified range of 3000 ohms per foot (9840 ohms per meter) or 600 ohms per foot (1968 ohms per meter) for Police models. Spraying the secondary ignition wires with a light mist of water may help locate an intermittent condition. Ignition components will arc to ground when a secondary component is faulty.
- Defective Module - See ELECTRONIC IGNITION SYSTEM DIAGNOSIS under IGNITION SYSTEMS in BASIC DIAGNOSTIC PROCEDURES - 3.8L BONNEVILLE, GRAND PRIX, IMPALA, LESABRE, MONTE CARLO, PARK AVENUE & REGAL.
- Ignition System Wiring - Loose ignition module feed or ground connection, or damaged system wiring.
- Remove spark plugs and inspect for fouling, cracks, wear, improper gap, burned or damaged electrodes and for improper heat range or reach.
- If spark plugs are gas or oil fouled, the cause of the fouling must be determined before replacing the spark plugs.
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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.