heavy knocking noise at low rpm or idiol - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1987-1991 Parley with regards to your 1987 to 1991 Bonneville, Olds 88 or Buick Le Sabre Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 03-31-2005, 06:11 PM   #1
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Default heavy knocking noise at low rpm or idiol

:( my 1990 bonneville has this weird loud knocking noise at low rpm or idol.The sound it self will go away at anything over 1500 rpm.Am stummped on the prob so any suggestions are great.
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Old 04-01-2005, 11:57 AM   #2
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Have a look that the crank pulley, Its actually a dampener... It in a way will absorb shock from say the compressor cycling on and off... The crank pulley will have a rubber section about 1.5 inches or so... Have a good look at it and make sure the rubber has cracked up... If the rubber is all broken up than you need a new crank pulley..

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Old 04-01-2005, 04:45 PM   #3
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I had the same symptoms, It was my crank pulley (Harmonic Balancer). I had it repaired at the dealer for around $300.00
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Old 04-03-2005, 08:00 PM   #4
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I have the same problem and it came down to the Harmonic Balancer. Get it fixed you should be fine Thats what I am doing. As if you let it go as I have the sound gets louder and louder
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Old 04-21-2005, 11:36 PM   #5
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I think you guys jinxed me, my balancer is broke again! Another symptom my be oil leaking from the seal right behind the pulley.
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