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Discussion Starter · #1 ·
Hello i just bought a 2003 gmc sierra. and after driving it for a few days i started to hear a high pitched criket like sound coming from the muffler... just wondering if anyone could give me some ideas on what it could be
 

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Discussion Starter · #3 ·
well i only hear it when the truck is stopped cause otherwise the engine is to loud to hear anything. if i start the truck up i dont hear it. but if i turn the air condition on and put it on high it starts.. but its not the air condition cause i can leave that off and just rev the gas and then it will start..

i figure its the muffler cause when i get out and listen for it you can distinctly hear the sound coming from the middle of the truck.. like around the muffler area.. a couple of my buddies listend to it and they thought it was the catalytic converter
 

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Discussion Starter · #6 ·
ok well i started it up and tried everything i mentioned.. then i took it for a drive... 20 minutes later still no sound... i dont know if last nights rain had something to do with it but the sound is gone for now
 
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