Pulley Squeal - 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 09-28-2010, 10:50 PM   #1
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Default Pulley Squeal

I was taking off from a stop light in town and I heard a squealing noise that followed the RPMs. I got in the driveway and determined that it was a pulley. I revved it up to 3000 RPM for ~5 seconds and the noise is gone (for now).

Video of the noise can be seen here: http://www.youtube.com/watch?v=CuSz-vRK3Ko

I determined that it is not the alternator or power steering. It also doesn't sound like it'* coming from the A/C pulley. More towards the back of the engine. Perhaps the idler pulley or water pump? Engine was running at 207 before the fans turned on. Usually it doesnt get over 195 or so.

What'* the deal here? It seems like idler pulleys are notorious for making noises in our cars, but driving it with a bad water pump is worse to me. Either way something'* gotta get fixed.
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Old 09-29-2010, 06:54 AM   #2
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You could squirt a little bit of WD-40 into the tensioner pulley to see if it goes away.
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Old 09-29-2010, 08:08 AM   #3
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Take the belt off and turn each pulley by hand. Listen for any noise or binding.
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Old 09-29-2010, 11:26 AM   #4
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How old is the belt. Coudl have some wear points.
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Old 09-29-2010, 12:53 PM   #5
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Quote:
Originally Posted by Danthurs View Post
Take the belt off and turn each pulley by hand. Listen for any noise or binding.
Quote:
Originally Posted by Nighthwk12 View Post
How old is the belt. Coudl have some wear points.
What they said. I had an idler pulley shatter on me once. Just heard a loud clunk in the hood and lost power steering. They are indeed notorious for going bad, but fortunately their replacement isn't particularly difficult.
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Old 09-29-2010, 01:19 PM   #6
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Quote:
Originally Posted by Danthurs View Post
Take the belt off and turn each pulley by hand. Listen for any noise or binding.
Remember, this may not always work. pulley squeal tends to be influenced by the tension of the belt, heat and RPM.
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Old 09-29-2010, 09:23 PM   #7
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Belt is a ~3 month old Gatorback.

I drove all day today without a sound. I will loosen the belt and check for play tomorrow afternoon. I had class and work today, so no time to look at it.
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Old 10-01-2010, 08:53 PM   #8
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Well I checked it out today and it looks like a new idler pulley is in order, and eventually a water pump too.
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