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1999 GMC Yukon SLT 4x4 What is making it loose power at take off and sometime popping noise? Could it be timing?

I changed everything possible from distributor to injectors and all sensors except the two front o2 sensors.

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  • GMC Master
  • 12,205 Answers

Where do you hear this popping noise ? Intake manifold ? or front of engine ? How does the vehicle run at higher rpm's ?

Posted on May 03, 2017

Testimonial: "Out the exhaust maybe, im always in the front seat sounds like its right under me. Go to take off and it hesitates then it starts popping but only for a few seconds. Sometimes when i rev it in park it will pop too. Havent increased throttle."

  • 2 more comments 
  • Jeff Armer May 03, 2017

    How many miles on it ?

  • Evelyn Bourque
    Evelyn Bourque May 03, 2017

    220,000

  • Jeff Armer May 03, 2017

    Popping in the exhaust could be caused by a burnt exhaust valve . Ever have any engine work done , valve job ? Doing a compression test on the cylinders would be the test to do .

  • Evelyn Bourque
    Evelyn Bourque May 03, 2017

    ok sounds good.thanks ill start with that.

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