Vehicle has misfiring and O2 codes.

Tiny
LYNDON GORDON
  • MEMBER
  • 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.
Tuesday, December 13th, 2011 AT 9:33 PM

3 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,796 POSTS
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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Tuesday, December 13th, 2011 AT 9:49 PM
Tiny
LYNDON GORDON
  • MEMBER
  • 3 POSTS
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.
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Wednesday, December 14th, 2011 AT 2:02 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,796 POSTS
Other possibles are injectors, vacuum leaks and coil failure.

Roy
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Wednesday, December 14th, 2011 AT 2:05 AM

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