Question about 2003 GMC Sierra 1500

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Plinking noise under GMC Sierra

When I start my truck and drive away,within a short distance up to a mile or so maybe less, I hear this sound that sounds like someone popping a dent out of an old oil can from under my truck. It happens after cooling down sitting on the driveway/

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  • Daniel Chalfant
    Daniel Chalfant Jul 29, 2012

    No dent,if imperfection it would have done it for years. Quality control is very high on exhaust systems due to Govt. mandates. I worked at the Assy. plant where these trucks are made in Ft. Wayne , IN for 22 years.

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  • Master
  • 468 Answers

Your muffler has a dent or slight imperfection in it. Whenever it heats up, is expands and pops the dent one direction, and once it cools enough, it pops back. This is completely harmless, and if you can live with the sound, won't hurt anything. (my '01 does it too)

Posted on Jul 31, 2010

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