What is the rattle?! - 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 09-28-2005, 09:26 PM   #1
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Default What is the rattle?!

I have a 1993 Bonneville SSEi and I have a nasty sounding rattle at idle. Once I get the RPM over 1300 it dissapates. The motor is also acting funny, it idles fine then stumbles then fine. I have just replaced the supercharger (rebuild from Canadian Superchargers) and the water pump. I ran the car with the serpentine belts off and no noise. I tried isolating by using one belt at a time and it still had the problem. I am thinking it is the harmonic balancer. I just want to be sure though. Has anyone else ran into this problem? Could that be the cause of my motor troubles?
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Old 09-28-2005, 10:01 PM   #2
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Sounds like the balancer to me, also. Can you grab a belt and move it enough to turn a pulley some?
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Old 09-29-2005, 12:17 AM   #3
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That'* the key. If the balancer moves by hand, replace it.
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Old 09-29-2005, 03:19 PM   #4
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I talked to a couple mechanics and they said it was the harmonic balancer, the only problem is getting my hands on one. I have tried a few places and no one stocks them or even orders them Autozone has one for $149 but it is a special order. Any other places to check?
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Old 09-29-2005, 04:25 PM   #5
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I ordered mine from gmpartsdirect.com. Cheaper, but you gotta wait a few days. maybe Napa has one?
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Old 09-29-2005, 08:48 PM   #6
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Rock Auto has a replacement harmonic balancer that is the same as the GM OEM balancer. It'* about $98.00.

www.rockauto.com
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