Question about 2003 GMC Yukon XL

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I have a 2003 gmc yukon, i have misfires on1,3,5 and 7 cyclinders mainly on 1 and 7. i've replaced spark plugs,wires and cam shaft position sencor. i've check fuel presure and it was fine, checked fuel injectors and they works. there is fire at each coil pack. can anyone help?

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Get back to basics. pull the plugs and check your compression. If ok, I would listen to injectors with a stethocope, and check resistance of injectors against spec..

Posted on Oct 01, 2011

  • Frank Meert Oct 01, 2011

    Also check for cat converter restiction on the drivers side, as you have a miss on 1,3,5,7 which are on the driver's side.

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Either a new clutch or timeing belt. hopefully the trasmission is ok

Posted on Jun 02, 2009

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