92 Bonneville stalls when breaking to a stop - 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 03-07-2009, 05:26 AM   #1
Junior Member
Thread Starter
 
Join Date: Feb 2005
Location: Connecticut
Posts: 5
Thanks: 0
Thanked 0 Times in 0 Posts
AlphaOne is on a distinguished road
Default 92 Bonneville stalls when breaking to a stop

My 92 Bonneville stalls when breaking to a stop. Sometimes it stumbles but
doesn't stall. Rarely but it may stumble or even stall when driving with my
foot off the accelerator for maybe 15 or 30 seconds. Works OK when driving
and if I accelerate hard it doesn't seem to hesitate and continues to run OK
as I accelerate normally. It runs somewhat rough at idling.
I replaced the PCM with a working one I have and it did the same thing.
Any help would be appreciated.

Tony
AlphaOne is offline   Reply With Quote
Old 03-07-2009, 09:06 AM   #2
Retired Senior Admin

Expert Gearhead
 
Danthurs's Avatar
 
Join Date: May 2006
Location: Sheboygan Wisconsin
Posts: 29,661
Thanks: 0
Thanked 16 Times in 13 Posts
Danthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to all
Default

Could be a number of things.

Vacuum leak, check all your lines, spray carb cleaner on them, the RPM will change if you spray a leak.

Bad TPS https://www.gmforum.com/t279319/

Try doing a seafoam on the car. 1/3 can in a vacuum line near the throttle body, the other 2/3 can in the fuel tank. Change oil shortly after doing this. I've seen this do great things.
Danthurs is offline   Reply With Quote
Old 03-07-2009, 12:22 PM   #3
Senior Member
True Car Nut
 
Purplehazeir's Avatar
 
Join Date: Sep 2008
Location: Arlington, WA
Posts: 7,979
Thanks: 0
Thanked 1 Time in 1 Post
Purplehazeir is on a distinguished road
Default

I have not encountered this yet in my Bonny, but I had a similar experience in my ZX3. It was a combination of a low idle (100 rpms down due to a Throttle Position Sensor set screw that came loose) and a vacuum leak. I lean towards a vacuum issue like Dan mentioned, which is easier to sort out than what else might be happening. Keep us appraised of your progress.
Purplehazeir is offline   Reply With Quote
Old 03-07-2009, 09:41 PM   #4
DINOSAURUS BOOSTUS

Expert Gearhead
 
BillBoost37's Avatar
 
Join Date: Mar 2005
Location: Enfield, CT
Posts: 41,391
Thanks: 0
Thanked 0 Times in 0 Posts
BillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of light
Default

It'* really interesting..when I read a post usually a couple things pop into my head.. I've been watching too much House lately I supposed.

Check the ole fuel pressure and then note if the car usually stalls when under 1/2 tank and maybe if you are heading downhill or on a turn. 92/93 fuel tanks had an issue with baffles breaking loose, that would allow the fuel to all slosh forward during a stop and starve the engine.

If you add those couple things to what the guys above me said..you should be pretty complete and find something that'* causing the patient to give you this rash.
BillBoost37 is offline   Reply With Quote
Old 04-09-2009, 03:37 AM   #5
Junior Member
Posts like a V-Tak
 
Join Date: Nov 2006
Location: Southern California
Posts: 29
Thanks: 0
Thanked 0 Times in 0 Posts
teachutofly is on a distinguished road
Default

OK, I had an almost identical problem with my 1994. It would intermittently stumble while waiting at a light, but if I took it out of gear (put it in neutral) it idled fine. Worked on it for a long time--nothing worked. Until...

Pull codes and look for the TCC (torque converter lockout clutch) code. On mine, the solenoid that controlled the clutch was going intermittent; it would try to intermittently lock up the torque converted while at a stop. If you are in gear, the engine is being stalled by trying to turn the wheels while you have the brake on. As the RPM dropped, the PCM would add power to try to maintain the set idle speed, and the power seemed to get the clutch to release...for a few seconds and then it would do it again.

Does your problem go away if you have it in neutral?
teachutofly is offline   Reply With Quote
Old 07-03-2009, 03:16 AM   #6
Member
Posts like a V-Tak
 
Join Date: Jul 2009
Posts: 51
Thanks: 0
Thanked 0 Times in 0 Posts
gary0326 is on a distinguished road
Default

my 92 bonneville did the exact same thing
i had to replace the mass air flow sensor
gary0326 is offline   Reply With Quote
Old 07-21-2009, 01:00 PM   #7
Junior Member
 
Join Date: Jul 2009
Posts: 1
Thanks: 0
Thanked 0 Times in 0 Posts
TIMEWEASEL is on a distinguished road
Default

My 94 is doing the exact same thing now....shows a code for tp sensor. Ive repplaced it twice in the last 6 months. Will a vacuum leak set a tps code? Ive just been putting it in neutral at stoplights for now.
TIMEWEASEL is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
My 1989 Brougham Shutters & Nearly Stalls Everytime I Come To A Stop KelleyCoSpares Cadillac 1 10-29-2012 08:11 AM
Stop it Stop it Stop it.......... BLACK94SSEi Lounge 6 09-09-2006 03:14 PM
Car stalls while coming to a stop sputnik767 1992-1999 3 08-20-2005 01:26 PM
93 Bonneville - Stalls at stop or cornering and not staring rh72 1992-1999 4 07-06-2005 05:10 PM
Breaking in a 2003 Bonneville SSEi rjkbills12 1992-1999 18 02-21-2003 01:45 AM


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 09:02 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.