Stalling when braking - 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 06-18-2009, 02:20 AM   #1
Member
Posts like a V-Tak
Thread Starter
 
Join Date: Feb 2004
Location: Upstate New York
Posts: 71
Thanks: 0
Thanked 0 Times in 0 Posts
BonBon is on a distinguished road
Default Stalling when braking

The good news - my Bonneville did an 8000 mile cross country trip no problem.

The bad news, she recently started giving me stalling problems. It started as throwing a code stating that I had a hose cracked, cracked UIM, or bad MAF, etc. The UIM is dorman (full change out, blah blah), checked the torque and for cracks - negative. Checked all hoses - negative. MAF under microscope -negative.

Since... the car has been starting up and idling rough usually, either increasing the rpm automatically or by me, until it settles down to a good idle. When driving down the road or highway speeds, the car is perfect. When I begin to brake the rpms drop to almost stall, recover, and repeat (oscillate) until it usually stalls out. Starts again with usually no problem (until the next stop light).

-Doesn't matter if engine is hot or cold
-Intermitent - does not do it all the time, but is usually frequent when does
-Braking slower or shifting into neutral seems to have some positive effect (keep from stalling)
-Sounds like a hose issue I know, but meticulously checked.

Thoughts?
BonBon is offline   Reply With Quote
Old 06-18-2009, 07:27 AM   #2
Junior Member
 
Toddster's Avatar
 
Join Date: Aug 2005
Posts: 0
Thanks: 0
Thanked 1 Time in 1 Post
Toddster is on a distinguished road
Default

Have you tried cleaning your MAF?

Also check out your TPS. (Throttle Position Sensor) There is a write up here in the tech info for testing it.



You may also have a slow responding IAC (Idle Air Control Valve) some may tell you to try to clean this but really the only fix for this sensor is to replace it.
Toddster is offline   Reply With Quote
Old 06-18-2009, 08:26 AM   #3
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

Check for a vacuum leak at the EGR tube.
Danthurs is offline   Reply With Quote
Old 06-19-2009, 12:03 AM   #4
Member
Posts like a V-Tak
Thread Starter
 
Join Date: Feb 2004
Location: Upstate New York
Posts: 71
Thanks: 0
Thanked 0 Times in 0 Posts
BonBon is on a distinguished road
Default

I did clean the MAF with no help. Ill check the TPS and for a leak at the EGR tomorrow when I get home.

Thoughts on possibly a coil? Ill be checking those too.
BonBon is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Help! Sudden stalling during hard braking. Puddy46 1992-1999 6 01-04-2005 05:42 PM
Antilock Braking System a No GO! shortstuf212559 1987-1991 13 09-07-2003 03:47 PM
60-0 Braking buickpower3800sc Performance, Brainstorming & Tuning 0 04-09-2003 01:04 AM
Improving My Braking Champaign-Granny Performance, Brainstorming & Tuning 6 03-25-2003 09:02 PM
braking improvments???? ktfd45 1992-1999 28 10-11-2002 03:22 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 01:36 AM.


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.