Wierd sound from up under the car or muffler - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 09-01-2004, 04:16 AM   #1
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Default Wierd sound from up under the car or muffler

I've noticed that every time i start my car up in the morning i get i wierd sound from up under the car which sounds like its coming from the muffler. The sound that im hearing sounds like a grinding or buzzing sound. And rarely it does it while im driving.
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Old 09-01-2004, 11:12 AM   #2
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Might be heat shield related. Check the rivits on all exhaust heat sheilds and replace if needed. You can use self tapping screws instead of rivits... Mine did this a couple of months ago, it was the HS above the CAT.
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Old 09-01-2004, 11:33 AM   #3
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Quote:
Originally Posted by Ace
Might be heat shield related. Check the rivits on all exhaust heat sheilds and replace if needed. You can use self tapping screws instead of rivits... Mine did this a couple of months ago, it was the HS above the CAT.
or u have a dead CAT
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Old 09-01-2004, 11:40 AM   #4
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I agree with the heat shield. Mine was rattling like crazy until I had it tightened up.
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Old 09-01-2004, 11:43 AM   #5
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Is it metal on metal buzzing? Or more like fuel bump humming?
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Old 09-01-2004, 01:16 PM   #6
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Its hard to explain, its more of like an BUZZ BUZZ....ENNN...BUZZ.
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