Intermittent Knocking Noise - Page 2 - 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 04-09-2009, 02:32 AM   #11
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It is possible that the tensioner work did not cause the problem.

I had a similar knock in my 94; finally turned out to be the RH engine mount, behind and to the left of the battery. The engine was not centered on the mount; under acceleration there would be metal to metal contact. The mechanic fixed it in a minute; he used that tool of incredible precision--a crowbar--and pried the engine side of the mount back towards the center of the rubber insulator. Its been fixed ever since.
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Old 04-09-2009, 11:02 AM   #12
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Quote:
Originally Posted by teachutofly View Post
It is possible that the tensioner work did not cause the problem.

I had a similar knock in my 94; finally turned out to be the RH engine mount, behind and to the left of the battery. The engine was not centered on the mount; under acceleration there would be metal to metal contact. The mechanic fixed it in a minute; he used that tool of incredible precision--a crowbar--and pried the engine side of the mount back towards the center of the rubber insulator. Its been fixed ever since.
Thanks much for that info, Teach. I think that'* the mount that'* disconnected or loosened to take the belt off. Using the mount guide (below) supplied by BillBoost37 sounds like that'd be the Torque axis mount.

I stopped by yesterday & the mechanic went w/ me on a test drive. He still didn't pinpoint the exact problem - said he'd check, reseat & retighten the mounts. I'll pass along your tip to him.

This GM dealership (Chev/Caddy) seems to just use a shotgun approach, usually with new parts involved. He'* already put in a new front tran. mount that was probably totally unnecessary. Seems they can't take the time to really diagnose these days.

"In total there are four mounts.

Front transmission mount - looking down from the front of the car is located on the front of the tran, slightly left of the airbox location.

Rear transmission mount - this one is located on the rear of the trans, in the same relative location as the front mount, only on the back instead of the front. This mount is wedged between the power steering rack and the subframe. Overall the toughest to swap due to it'* sandwiching.

Torque axis mount - This mount is located on the end of the motor at the passenger side.

Dog bone mount - This mount is located on the back side of the transmission tail shaft on the passenger side of the car and is the easiest mount to swap because it does not carry any of the motor/trans weight."

Last edited by boa12; 04-09-2009 at 11:04 AM.
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Old 04-15-2009, 02:59 PM   #13
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Thanks guys, especially Teach. The GM tech retightened the mounts including releasing & redoing that torque axis mount which I think was the real culprit. Knocking noise seems to be completely gone now.
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