rough idle - 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 03-08-2006, 06:59 AM   #1
Member
Posts like a V-Tak
Thread Starter
 
Join Date: Jan 2006
Location: Fenton,Michigan
Posts: 33
Thanks: 0
Thanked 0 Times in 0 Posts
D4684E is on a distinguished road
Default rough idle

I have a 1994 sse bonniville I have a rough idle parked and while in gear at a stop light ,I have a 120 amp alt from auto zone could that be it
D4684E is offline   Reply With Quote
Old 03-08-2006, 08:13 AM   #2
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

Doubt it'* the alternator.

Biggest causes of rough idle would be vacuum leaks or a well needed tune up. I'd start with the vacuum leaks.

This is done by visual inspection and moving each connector. Look for dry cracked or broken lines and replace them.
BillBoost37 is offline   Reply With Quote
Old 03-08-2006, 09:39 AM   #3
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

This is another good cause and fix for a poor idle:

http://www.bonnevilleclub.com/forum/...e=article&k=64
willwren is offline   Reply With Quote
Old 03-08-2006, 09:44 AM   #4
Junior Member
 
Join Date: Mar 2003
Location: Purgatory
Posts: 0
Thanks: 0
Thanked 0 Times in 0 Posts
vital49 is on a distinguished road
Default

Are you getting a check engine light? If so, that'd be your first point of reference.

How old are the plugs and wires?
vital49 is offline   Reply With Quote
Old 03-08-2006, 11:07 AM   #5
Senior Member
Posts like a Camaro
 
Join Date: Apr 2005
Location: Grand Rapids,MI
Posts: 981
Thanks: 0
Thanked 0 Times in 0 Posts
Masterbm is on a distinguished road
Default

Must likey is plugs or spark plugs, but just for laugh look on the air filter. I had 94 corsica that would come close to stall because the air filter was really dirty .
Masterbm is offline   Reply With Quote
Old 03-08-2006, 03:48 PM   #6
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

Sounds like what I and a few other members here are experiencing. Is the idle fine until the engine starts coming up in temp, and then starts progressivly getting worse?
LakevilleSSEi is offline   Reply With Quote
Old 03-09-2006, 12:30 PM   #7
Executed
 
Join Date: Dec 2002
Location: Purgatory
Posts: 0
Thanks: 0
Thanked 0 Times in 0 Posts
shortstuf212559 is on a distinguished road
Default

you said it lakevilleSSEi........ nice idle when cold.... good when warm in park or neutral. slight hiccupy idle in gear......
shortstuf212559 is offline   Reply With Quote
Old 03-09-2006, 01:54 PM   #8
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

Mine idles rough once it'* about half way to op temp, and it'* probably worse in gear.

It all feels the same anymore....getting sick of it.
LakevilleSSEi is offline   Reply With Quote
Old 03-09-2006, 01:57 PM   #9
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

Nate...did you ever do gears and chain?
BillBoost37 is offline   Reply With Quote
Old 03-09-2006, 04:21 PM   #10
Senior Member
Posts like a Northstar
 
Join Date: Jan 2002
Location: southern California
Posts: 538
Thanks: 0
Thanked 0 Times in 0 Posts
billha is on a distinguished road
Default

Quote:
Originally Posted by LakevilleSSEi
Mine idles rough once it'* about half way to op temp, and it'* probably worse in gear.
It all feels the same anymore....getting sick of it.
My '92 sse */c is basically like that too, and I've never found the cause.
It has plenty of power, starts right up, never stalls, gets decent fuel economy, and has no error codes, but usually idles a bit rough. The RPMs are steady at idle.
Mine, though, will idle rough on one day and idle much smoother the next day...same time of day, same ambient temperature, same distance traveled, same driver, same driving style, same traffic conditions. And sometimes it'll idle pretty smoothly as I come to a stop, and for the first couple of seconds after the stop, but the idle will slowly get more rough the longer it idles at a stop. The RPMs don't vary when that happens, and the boost gage reading is pretty steady. Kinda suggests a vacuum leak or sensor problem, but I've yet to find it!
I'm beginning to wonder if maybe part of the problem is the gas. I always use 91octane (this is the highest premium octane I've seen in my area), but California reportedly reformulates the gas at different times of the year.
billha is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
From rough idle to high idle randman1 1992-1999 25 09-07-2004 09:20 PM
'00SSEi:rough idle,high idle...Please Help.... GTP2SSEi General GM Chat 2 07-29-2003 01:46 PM
rough idle only in drive laquintaman2003 1992-1999 10 01-04-2003 01:59 PM
rough idle billha 1992-1999 19 11-14-2002 03:59 PM
Rough idle problem. columbusbonne 1992-1999 14 11-04-2002 11:12 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 02:44 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.