SC question??? - 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 02-04-2008, 03:40 PM   #1
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Default SC question???

When the car is at idle it has a knocking sound, when I removed the SC belt the knocking sound went away. Put the SC belt back on and knocking sound returned at idle. When I increased the rpms the SC quieted down to where the knocking sound was inaudible. Turned the car off and removed SC belt again and moved the pulley back and forth and felt some "slop" both ways before feeling the SC catch. What could the problem be? Also, the knocking sound does not occur at start up and becomes much more frequent the longer car runs. It definitely sounds like a rod knocking, but eliminated that when bypassed the SC. Any help would be much appreciated. Thank you very much. Bryan
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Old 02-06-2008, 12:11 AM   #2
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I pretty much have the same problem, but I would define the noise as more of a grind. I have diagnosed it to be the coupler. $30 part from rollingperformance.com

Requires taking the SC off the block, and taking the nose drive off the SC. Not hard to do.

Basically the shaft and the actual rotors are connected by a coupler. This coupler has holes in it. Over time these holes wear into more of an oval shape. This oval shape creates that "slop" you feel and can cause noise.

http://www.bonnevilleclub.com/forum/...026137#1026137
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Old 02-06-2008, 01:27 AM   #3
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Agreed it sounds like a coupler.

Bear in mind, the Series 2 the OP has will not require the entire */C be removed in order to remove the snout.
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Old 02-06-2008, 11:40 AM   #4
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Thanks for all the info and help, will be ordering new coupler tomorrow and hopefully that takes care of everything.
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