Getting a thunk after moderate throttle and letting off - 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.

Reply
 
 
 
Thread Tools Search this Thread
Old 11-17-2004, 12:55 PM   #11
Junior Member
Posts like a Ricer Type-R
 
Join Date: Aug 2002
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
willwren is on a distinguished road
Default

What you described is exactly what I have right now. A broken mount. It'* being replaced with the transmission (same time).
willwren is offline   Reply With Quote
Old 11-17-2004, 08:20 PM   #12
Senior Member
True Car Nut
 
Join Date: Sep 2004
Location: Farmington, Minnesota =MWBF '05 SURVIVOR= =CEBF '06 SURVIVOR= =August '06 COTM=
Posts: 9,130
Thanks: 0
Thanked 0 Times in 0 Posts
LakevilleSSEi is on a distinguished road
Default

If you ever retire your severely **** beaten trans....lol
LakevilleSSEi is offline   Reply With Quote
Old 11-17-2004, 08:39 PM   #13
Member
Posts like a V-Tak
Thread Starter
 
Join Date: Aug 2004
Posts: 55
Thanks: 0
Thanked 0 Times in 0 Posts
Grease is the Word is on a distinguished road
Default

Quote:
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?
Grease is the Word is offline   Reply With Quote
Old 11-17-2004, 08:40 PM   #14
Member
Posts like a V-Tak
Thread Starter
 
Join Date: Aug 2004
Posts: 55
Thanks: 0
Thanked 0 Times in 0 Posts
Grease is the Word is on a distinguished road
Default

I can duplicate the symptom in the driveway, so something is loose!
Grease is the Word is offline   Reply With Quote
Old 11-17-2004, 08:44 PM   #15
Senior Member
True Car Nut
 
Join Date: Nov 2002
Location: Texarkana, Texas
Posts: 6,041
Thanks: 0
Thanked 0 Times in 0 Posts
Damemorder is on a distinguished road
Default

Quote:
Originally Posted by Grease is the Word
Quote:
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.
Damemorder is offline   Reply With Quote
Old 11-17-2004, 11:02 PM   #16
Member
Posts like a V-Tak
Thread Starter
 
Join Date: Aug 2004
Posts: 55
Thanks: 0
Thanked 0 Times in 0 Posts
Grease is the Word is on a distinguished road
Default

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.
Grease is the Word is offline   Reply With Quote
Old 11-17-2004, 11:05 PM   #17
Senior Member
True Car Nut
 
Join Date: Nov 2002
Location: Texarkana, Texas
Posts: 6,041
Thanks: 0
Thanked 0 Times in 0 Posts
Damemorder is on a distinguished road
Default

That one is on the rear passenger side of the engine. mounts to the diff cover screws.
Damemorder is offline   Reply With Quote
Old 11-18-2004, 10:10 AM   #18
Senior Member
Certified GM nut
 
Join Date: Feb 2004
Location: CT
Posts: 2,099
Thanks: 0
Thanked 1 Time in 1 Post
SSEBONNE4EVA is on a distinguished road
Default noise

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.
SSEBONNE4EVA is offline   Reply With Quote
Old 11-18-2004, 10:54 AM   #19
Senior Member
Posts like a Northstar
 
Join Date: Mar 2003
Location: Brewerton NY
Posts: 551
Thanks: 0
Thanked 0 Times in 0 Posts
karfreek is on a distinguished road
Default

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
karfreek is offline   Reply With Quote
Old 11-18-2004, 02:53 PM   #20
Member
Posts like a V-Tak
Thread Starter
 
Join Date: Aug 2004
Posts: 55
Thanks: 0
Thanked 0 Times in 0 Posts
Grease is the Word is on a distinguished road
Default

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.
Grease is the Word is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Sputters and misses under moderate to heavy acceleration. 88Chev93Olds Buick 5 03-23-2015 07:42 PM
raw fuel smell after getting on the throttle. eltatertoto General GM Chat 1 09-15-2011 12:25 AM
Thunk in right front samthecrewman 1992-1999 0 08-12-2008 02:30 PM
Car pulls on moderate acceleration and off throttle. jaye22 1992-1999 8 01-27-2008 10:30 PM
engine drops to idle when letting off the gas at speed cozmosis2 1987-1991 5 12-17-2004 07:22 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 07:29 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.