Runs OK then idles rough after 15 min - 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 06-17-2009, 09:46 AM   #1
Junior Member
Thread Starter
 
Join Date: Jun 2009
Posts: 2
Thanks: 0
Thanked 0 Times in 0 Posts
bobref is on a distinguished road
Default Runs OK then idles rough after 15 min

My wife has a 1997 SE that runs OK for about 15 min then when it idles it runs very rough and acts like it wants to stall out. A strong odor comes from the catalytic converter. Any suggestions?
bobref is offline   Reply With Quote
Old 06-17-2009, 02:17 PM   #2
Senior Member
Posts like a Supercharger
 
gonzo4191's Avatar
 
Join Date: Jul 2007
Location: LZ, IL
Posts: 164
Thanks: 0
Thanked 0 Times in 0 Posts
gonzo4191 is on a distinguished road
Default

whats fuel pressure??

could also be a plugged CATalytic converter, does it get red hot when running?
gonzo4191 is offline   Reply With Quote
Old 06-17-2009, 04:28 PM   #3
Junior Member
Thread Starter
 
Join Date: Jun 2009
Posts: 2
Thanks: 0
Thanked 0 Times in 0 Posts
bobref is on a distinguished road
Default

fuel pressure is fine. I can't answer whether or not it'* red hot. I will check. I drove it last night to try and figure what was wrong and noticed a strong odor, the smell of a cat/conv.
bobref is offline   Reply With Quote
Old 06-17-2009, 05:02 PM   #4
Senior Member
Posts like a Supercharger
 
gonzo4191's Avatar
 
Join Date: Jul 2007
Location: LZ, IL
Posts: 164
Thanks: 0
Thanked 0 Times in 0 Posts
gonzo4191 is on a distinguished road
Default

whats fuel pressure?
gonzo4191 is offline   Reply With Quote
Old 06-17-2009, 10:02 PM   #5
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

Sounds like a clogged cat. You can get a after market cat from ZZ performance for about $70
Danthurs is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
97 97 Bonneville rough idle after start then runs fine. Mattus Pontiac 12 11-24-2011 03:19 PM
Buick 3800 barely runs on cold start...then runs fine racer42 General GM Chat 3 03-04-2011 01:13 AM
Runs then slows then stalls RobertS 1992-1999 54 06-20-2009 04:15 PM
A/C Problems - Cold then HOT then Cold then Hot!!!!! nick s 1992-1999 13 04-22-2006 11:40 AM
4g63 rebuild in less then 10 min LakevilleSSEi Lounge 11 11-03-2005 11:29 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 06:40 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.