Mechanics

VEHICLE HAS MISFIRING AND O2 CODES.

2004 GMC Savana • 23,237 miles

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.
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Lyndon Gordon
December 13, 2011.




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

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

Roy
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ASEMaster6371
Dec 13, 2011.
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
Lyndon Gordon
Dec 14, 2011.
Other possibles are injectors, vacuum leaks and coil failure.

Roy

ASEMaster6371
Dec 14, 2011.

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