Grinding Noise - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 06-25-2007, 09:59 AM   #11
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Quote:
Originally Posted by sonoma_zr2
it is very easy to eliminate the elc. turn the key to "run" , go to the right rear of the car and listen. when the elc compressor turns on (about 10 seconds after key on) you will know.
Between 37 and 42 seconds per the FSM
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Old 06-26-2007, 11:14 AM   #12
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Definately not the ELC, it sounds perfectly normal.
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Old 06-26-2007, 11:58 AM   #13
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I am not a pro so correct me if I am wrong. I have heard a bad cat that was junk sound like a muffler draging. When the stuff inside breaks up it sounds like rocks in a coffee can. This could be a possibility. If you lay under the car and pound on the cat with your fist it should make the same noise if this is the problem. Then you have a reason to put on a high flow cat.
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Old 06-26-2007, 12:08 PM   #14
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Are you sure it'* not a rattle that sounds like a grinding noise? Maybe a heat shield is loose...
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Old 06-26-2007, 10:52 PM   #15
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I'll check both those out in the morning once the exhaust has had a chance to cool down.
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Old 06-26-2007, 11:11 PM   #16
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I'm kind of thinking along with the exhaust guys at this point, but further back.

Our '98 is famous for very annoying, hard to find noises in that boxy area containing the last of the exhaust pipe and the muffler. Even at rest (if clamps and/or hangers have deteriorated), engine vibration at idle can easily work it'* way down there.

Might as well look closely while you're under there, if you haven't already.
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Old 06-27-2007, 12:36 AM   #17
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I'll examine the exhaust thoroughly while I'm down there... I've not climbed under there since I first bought the car, so I'll do that tomorrow.
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