VEHICLE HAS MISFIRING AND O2 CODES.

2004 GMC Savana

Tiny

Lyndon Gordon

December, 13, 2011 AT 9:33 PM

My 2004 GMC Savana V6 3500 VIN# 1GDJG1U141140461, misfire when it warms up. It stifles during acceleration. Small explosions can be heard in the exhaust system when the un-burnt gas ignites, while laboring to accelerate. What can be the problem? Vehicle has misfiring and O2 codes.

FOUND 5709 RELATED QUESTIONS

Engine Miss

52 ANSWERS
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3 Answers

Tiny

ASEMaster6371

December, 13, 2011 AT 9:49 PM

Repair the miss fires first and the o2 code may go away.

I would start with plugs, wires fuel and air filter.

Roy

Tiny

Lyndon Gordon

December, 14, 2011 AT 2:02 AM

Vehicle has new plugs and wires, runs good when cold. It starts to shake when it reaches normal operating temperature. To prevent misfiring I would turn it off at stop lights and restart it when light turns green. If I allow it to idle too long, it will start to misfire and shake.

Tiny

ASEMaster6371

December, 14, 2011 AT 2:05 AM

Other possibles are injectors, vacuum leaks and coil failure.

Roy

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