Name That Noise - 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 03-17-2007, 06:06 PM   #1
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I noticed this today after getting out of the car while it was still running. The car is at full operating temperature by the way. Alternator bearings? I haven't had a chance to really look around that much, but I wanted to check and see if you guys see/hear something obvious. The video does a pretty good job of replicating the sound in real life - somewhat of a high pitch squeal.
Thanks!
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Old 03-17-2007, 06:10 PM   #2
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When my Idler went it was making a noise like that.
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Old 03-17-2007, 06:30 PM   #3
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Sounds like a bearing to me; remove a belt and hand roll a pulley. You will probably find it soon enough.
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Old 03-17-2007, 07:46 PM   #4
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Took the main belt off and it looks like my alternator is squeaky. Video soon to show you guys.
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Old 03-17-2007, 08:37 PM   #5
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Well the video doesn't show the squeak, but it is a combination of a ball bearing sound (nothing overly rough, but should it be silent?) with a high pitched chirp as it reaches one point in the rotation - hence the squeal at full speed.

Here are my tensioner marks. How do they look?
Main Belt
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Supercharger Belt
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One last thing. Should the AC Compressor Pulley sound like this? My AC works just fine by the way.


Thanks again guys.
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Old 03-17-2007, 10:46 PM   #6
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Find a long peice of metal, or a long screwdriver if you have one. Touch one end of the metal rod to each pulley bolt, and put your ear on the other end of the rod and listen. Do that to each pulley that you can reach, and you will find the offending pulley quickly.

The sound of the bad pulley will telegraph quite well up the metal rod into your ear.
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