Annoying vibrating noise! What is it???!! - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 01-21-2003, 06:51 PM   #1
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Default Annoying vibrating noise! What is it???!!

I went to a do-it-yourself high pressure car wash and I sprayed off the undercarriage (it'* snowing like crazy here). Anyway, shortly after that wash I heard this damn subtle vibrating or buzzing sound, from under the car that occurred whenever I pressed the gas pedal. It only happened when I pressed the gas for some reason, and now it does it when I'm idling AND it'* getting louder. I think maybe something'* loose after I sprayed it Could be something with the exhaust I think. Can anyone offer any help?? Thanks, I'd appreciate it.
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Old 01-21-2003, 10:03 PM   #2
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Check for a possible loose exhaust sheathing. There is one that sits right above the muffler. If it falls down, it rattles on top of the muffler.
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Old 01-21-2003, 11:26 PM   #3
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Also check the top shield of the catalytic converter. Those rivets come out on the cheap replacment ones. I had to run some new screws in mine.
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Old 01-22-2003, 09:19 AM   #4
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My money is on the Cat shielding being loose. You may have dislodged the dirt from it'* place when you washed it away.
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Old 01-22-2003, 10:18 PM   #5
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I noticed it was coming from the cat area under the car. I don't think it'* a big prob, it just sounds horrible! I guess something'* loose because I just held part of the exhaust (with a glove on ) when it was idling and the noise was much more quiet. I'll find out exactly when I get my oil changed next week. Thanks for the help.
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Old 02-05-2003, 03:24 PM   #6
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My 93 had similiar noise. Turned out to be inside the cat. converter.
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Old 02-05-2003, 03:40 PM   #7
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Mine, too. Scared the hell out of me until I figured out what it was.
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Old 02-06-2003, 10:33 AM   #8
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So it was just something loose in the cat? What did you do to fix it? What should I expect if I take it to a shop? Thanks
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Old 02-06-2003, 02:27 PM   #9
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Look at my sig. You'll see what I did with the cat!

I'd get a friend (a trusted friend) to rev your throttle while you're under your car and try to pin it down. Do it in gear (carefully) and out of gear. If it'* the cat, you'll be able to tell with the car off. Just kick the sucker. If it rattles, replace it.
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Old 02-06-2003, 03:52 PM   #10
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i will help u, hehehe "whats this pedal do?"
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