Knocking noise from supercharger? - 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 12-29-2006, 06:21 PM   #1
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Default Knocking noise from supercharger?

My 95 recently started to knock as soon as it starts up and gets faster as I rev doesnt really get louder. Anyways I was reading about the Harmonic blancer and I dont think that is the problem due to the fact that it doesnt go away when its reved. And nothing looks broken or anything. It sounds like it is coming from the blower, I hope not Can anyone help me out. Tell me some bad news though I have my eyes on a 2002 SSEi. Okay maybe just tell me the truth.
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Old 12-29-2006, 06:32 PM   #2
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This should be easy enough for you to do. First, slip the belt off the supercharger and spin the pulley. Take notice on if there is "play" (time between pulley spin and the resistance you feel once the rotors start to turn). If there is ANY, the coupler is shot. If you are mechanically inclined, this is an easy changeout but will cost between 100-150 dollars total to do the job right (you will need to take off the supercharger to change the coupler, and replace the gaskets).

If there is NO play, there could be other things too, such as the balancer (again, an easy fix if you are mech. inclined), rod bearing (not an easy fix...believe me, I know), or maybe a tensioner.f

EDIT: Whoa, a supercharged SE...that'* kinda rare
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Old 12-29-2006, 06:34 PM   #3
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Quote:
Originally Posted by sandrock
This should be easy enough for you to do. First, slip the belt off the supercharger and spin the pulley. Take notice on if there is "play" (time between pulley spin and the resistance you feel once the rotors start to turn). If there is ANY, the coupler is shot. If you are mechanically inclined, this is an easy changeout but will cost between 100-150 dollars total to do the job right (you will need to take off the supercharger to change the coupler, and replace the gaskets).

If there is NO play, there could be other things too, such as the balancer (again, an easy fix if you are mech. inclined), rod bearing (not an easy fix...believe me, I know), or maybe a tensioner.
if it still makes noise with reving, it cant be just the coupler...

can you take a video?
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Old 12-29-2006, 06:34 PM   #4
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Update: Its not the supercharger its farther south. Could it be my compressor? Its been broken for months. Its not on when I start the car nor when I am driving it. But it sounds like its it or near there anyways. By the way the car runs fine idle is smooth and it doesnt seem that there is a lost of power but then again I dont try to run it hard right now.
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Old 12-29-2006, 06:35 PM   #5
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sure I will take some video now.
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Old 12-29-2006, 06:36 PM   #6
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how about you take the belt off the comressor and leave the other belt on?
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Old 12-29-2006, 06:44 PM   #7
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well I will do that tommorow I would video tape it but really there isnt anything unusual the only thing that will help you is the sound maybe. I will update tommorow.
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