Question about 2003 GMC Sierra 1500
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/
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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Posted on Jan 02, 2017
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