Question about GMC Cars & Trucks

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Why is my GMC service truck making a popcorn sound coming from under the hood?

No loss of power, just constant popping when driving

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  • paulmacintyre
    paulmacintyre Apr 06, 2015

    Make sure all the spark plugs are tight. Sounds as if compression is sneaking by a loose spark plug

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2 Answers

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  • GMC Master
  • 3,218 Answers

Check for loose spark plug/s. Sounds like compression going by a spark plug

Posted on Apr 06, 2015

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  • GMC Master
  • 12,124 Answers

Does it do it idling or just while moving ? How does it idle smooth or ruff ?

Posted on Apr 06, 2015

  • chad higenbottom Apr 06, 2015

    Idles fine only while moving

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SOURCE: 2004 silverado

THIS IS NORMAL noise for your truck. carbon buildup on pistons causes a cold start knock until warms up. you can run some top engine cleaner thru engine to help. but noise is nothing to affect life of engine

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SOURCE: popping sound

Make sure the shocks are reattached at both ends; also if it has coil springs vs torsion bars, they may be twisting upon spring movement. if not sure, you can squirt some oil on the bottom of the coil springs to test. if the popping stops then the springs may need repositioning (twisting to the proper spots) or get an after market pad to place underneath the spring where it contacts the lower "a"frame. good luck

Posted on Dec 30, 2008

landsend
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SOURCE: Whistling sound coming from under the hood of my 01 exterra!

a vacuum leak for sure.

Posted on Apr 01, 2009

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