1991 Buick LeSabre Custom Limited rough idling - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Buick When starting new posts, please specify YEAR, MAKE, MODEL, ENGINE type, and whatever modifications you have made.

Reply
 
 
 
Thread Tools Search this Thread
Old 06-17-2011, 03:41 PM   #11
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

Have you checked your fuel pressure. For the most part rough idle is a vacuum leak. have you inspected your EGR tube. You can't test this by spraying carb cleaner on it. You actually have to take it off and hold it up to light. The only sensors that can cause rough idle is the IAC, make sure it'* all clean, if not that cone won't seal up. The MAF sensor can cause problems if it'* dirty.
Danthurs is offline   Reply With Quote
Old 06-17-2011, 04:00 PM   #12
Junior Member
Thread Starter
 
Join Date: Jun 2011
Posts: 7
Thanks: 0
Thanked 0 Times in 0 Posts
tcbr1966 is on a distinguished road
Default

Quote:
Originally Posted by Danthurs View Post
Have you checked your fuel pressure. For the most part rough idle is a vacuum leak. have you inspected your EGR tube. You can't test this by spraying carb cleaner on it. You actually have to take it off and hold it up to light. The only sensors that can cause rough idle is the IAC, make sure it'* all clean, if not that cone won't seal up. The MAF sensor can cause problems if it'* dirty.
Will have another look, I just have to walk away from all this for a while, I'm getting too frustrated for now...mebbe have a beer, come back later

Thanks for the input, I'll post again later after I've had a chance to revisit these possibilities.
tcbr1966 is offline   Reply With Quote
Old 06-17-2011, 04:03 PM   #13
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

Sometimes that'* what you need to do. Plenty of times I've been scratching my head, then finally walk away. I'll be sitting there when it comes to me. You will get it, and then smack yourself, dang, why didn't I think of that right away. When you shut the engine off, listen real close, do you hear any hissing?
Danthurs is offline   Reply With Quote
Old 06-17-2011, 05:42 PM   #14
Senior Member
True Car Nut
 
rjolly87's Avatar
 
Join Date: Jun 2003
Location: Las Cruces, NM
Posts: 6,857
Thanked 298 Times in 246 Posts
rjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant future
Default

I would OHM out the coils, not just to make sure they are within spec, but also the closer they are to each other, the better. The other thing I would ask about? How clean is the engine? I would run a seafoam treatment, blast the crap out of it, then change the plugs again.
rjolly87 is offline   Reply With Quote
Old 06-17-2011, 06:21 PM   #15
Senior Member
True Car Nut
 
Buick96's Avatar
 
Join Date: Jan 2011
Location: Michigan
Posts: 3,344
Thanks: 0
Thanked 0 Times in 0 Posts
Buick96 is on a distinguished road
Default

its either a custom or a limited, it cant be both :/

I had this problem once, one day I started my car and it sounded like a derby car had no idea what was going on, took it to a gm dealership they ran it for a little while and suddenly it was fine again. Apparently there was a chunk of engine sludge in a line somewhere causing it to cough. Try running it for a while, do the sea foam deal, and start using gumout when you do oil changes. I started that routine (minus sea foam) and my 96 lesabre custom runs like a champ.
Buick96 is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
1991 Buick Lesabre Custom. Hesitation, rough Timmah Buick 15 02-09-2017 07:57 PM
I'm back with my new 2001 Buick Lesabre Limited eb-86 Buick 17 12-14-2014 10:22 AM
94 Buick Lesabre limited engine stall after 3 min SoulDiver Buick 4 09-19-2011 02:18 AM
HVAC problems with my 1997 Buick LeSabre Limited Andx0r Buick 2 02-28-2008 09:02 PM
My 1997 Buick LeSabre Limited LeSabreUltra Your Ride: GM Pictures & Videos 22 04-02-2007 12:02 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 05:17 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.