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.

Getting a thunk after moderate throttle and letting off

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Old 11-17-2004, 11:55 AM
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What you described is exactly what I have right now. A broken mount. It'* being replaced with the transmission (same time).
Old 11-17-2004, 07:20 PM
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If you ever retire your severely **** beaten trans....lol
Old 11-17-2004, 07:39 PM
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Originally Posted by willwren
What you described is exactly what I have right now. A broken mount. It'* being replaced with the transmission (same time).
Is it a weld or bracket that broke or a rubber mount that has deteriorated?
Old 11-17-2004, 07:40 PM
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I can duplicate the symptom in the driveway, so something is loose!
Old 11-17-2004, 07:44 PM
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Originally Posted by Grease is the Word
Originally Posted by willwren
What you described is exactly what I have right now. A broken mount. It'* being replaced with the transmission (same time).
Is it a weld or bracket that broke or a rubber mount that has deteriorated?
Deteriorated rubber. When looking from above, It'* almost exactly below where the front exhaust manifold connects the the crossover pipe. I changed out that mount three or four times on my car. Little time saving tip, Put the mount in the subframe first, Then lower the drivetrain until the other three holes line up.
Old 11-17-2004, 10:02 PM
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Is this what it looks like?

http://www.napaonline.com/cgi-bin/nc...grpid=90788790

That is what I get when I search for a front engine mount on my car -- $29. I'll check it out and make sure that is what is giving me the problems.
Old 11-17-2004, 10:05 PM
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That one is on the rear passenger side of the engine. mounts to the diff cover screws.
Old 11-18-2004, 09:10 AM
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My car once made the exact crunching noise when putting the car in reverse.
I sprayed the exhaust coupling below the firewall with penetrant over night
and the problem went away.
It sounded like metal on metal banging.
Old 11-18-2004, 09:54 AM
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Where are the other mounts on a Series II. I know of the torque mount, and that is AOK. But it seems like I get excessive engine/drivetrain movement/noise when I let off quick or when a tire is spinning and then grabs.

Jay
Old 11-18-2004, 01:53 PM
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I have done some more experimenting. It seems like high torque situations produce more clunk than others.

So taking off from a start with gusto and letting off does more than giving it throttle at 30mph, for example.

It is not a ***** or a bang, but more of a thud or clunk. Kind of muffled and isolated, but still audible and I swear I can slightly feel it (or my head thinks so).

I still have to get my wife to do the brake/driveway gas thing to check for proximity.


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