Question about 1999 GMC Yukon

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After motor warms it misses and backfires

After motor warms it misses and has no power already replaced fuel filter,distubator cap,rotor button,and plug wires and no help

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  • daisymay7620 May 07, 2010

    there is no engine light coming on

  • daisymay7620 May 07, 2010

    clean out the catalic converters alrady and no help

  • daisymay7620 May 11, 2010

    tried replacing the whole distubator with one out of a truck that we know was good and no help any other ideas

  • Anonymous May 11, 2010

    Now you see why throwing parts at it, didn't help. You need to know the vehicles systems and how to diagnose

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You need to test the catalytic converter, these were a common problem. You can do this by removing the oxygen sensor in front of the cat and driving it. It will be noisy, but the open hole will allow excessive back pressure to escape and it will drive better if the exhaust is restricted.

Posted on May 07, 2010

  • Dave  C
    Dave C May 09, 2010

    I wouldn't feel too bad about replacing all the ignition components, that was really just a thorough tune up, As far as knowing the vehicles system and how to diagnose it, I've been doing this for 30 years with all the best equipment and I still get stumped, as do other technicians. Getting back to your problem, I know these vehicles had problems with the distributor assembly itself. I'm not saying that's what it is, but if you can somehow get another one to try, it may be the cause. I had one of these with the same problem and replaced the MAF sensor, honestly it was a guess, and it did not help at all, but if yours is like the one I had, the problem happens the instant the engine gets warm enough to enter closed loop. With mine, the distributor fixed it.

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