VEHICLE HAS MISFIRING AND O2 CODES.

  • Tiny
  • Lyndon Gordon
  • 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 Answers

  • Tiny
  • ASEMaster6371
  • Expert
  • 25,550 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

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
  • Expert
  • 25,550 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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