1996 SE starts rough, eventually revs than goes to normal - 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 05-30-2007, 06:55 PM   #1
Member
Posts like a V-Tak
Thread Starter
 
Join Date: May 2006
Posts: 34
Thanks: 0
Thanked 0 Times in 0 Posts
DeeMutz is on a distinguished road
Default 1996 SE starts rough, eventually revs than goes to normal

After looking around, i didn't find a thread about this secific problem. If on exists, please PM me link and delete this thread.

Ok here we go .... when I start my car (anytime, warm or cold) it'll catch, sputter, stall. sometimes it does this once, sometimes up to 5-6 times before it finally stays runing. I say stay running, but it seems to sputter, like there is a vaccum leak. It will eventually rev up to about 2000RPM, then level out and run fine until I turn it off. I have also noticed that myvolt indicator stays low until it revs then is stays steady at ~14 volts.

any ideas?

I did see the MAF/TB cleaning in tech info, I might try that out this weekend.

Thankx in advance for the help

Dave
DeeMutz is offline   Reply With Quote
Old 05-31-2007, 08:16 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

Dave...

I'd agree it sounds vacuum related. However let'* go right through it.

Check the fuel pressure without engine running. You should see ~40-50psi
Review all vacuum hoses, remembering the couple under the airbox going to the charcoal canister.
Clean that TB if it hasn't been done. Idle Air Control valve can be dirty and causing this as well.

When you say it revs to 2000 rpm.. is that with you pressing the throttle?
BillBoost37 is offline   Reply With Quote
Old 05-31-2007, 06:51 PM   #3
Member
Posts like a V-Tak
Thread Starter
 
Join Date: May 2006
Posts: 34
Thanks: 0
Thanked 0 Times in 0 Posts
DeeMutz is on a distinguished road
Default

Quote:
Originally Posted by BillBoost37
Dave...

I'd agree it sounds vacuum related. However let'* go right through it.

Check the fuel pressure without engine running. You should see ~40-50psi
Review all vacuum hoses, remembering the couple under the airbox going to the charcoal canister.
Clean that TB if it hasn't been done. Idle Air Control valve can be dirty and causing this as well.

When you say it revs to 2000 rpm.. is that with you pressing the throttle?
I don't touch the throttle until it levels out. I am getting a pressure test kit tommorow (payday :p) along with a TB gasket and some seafoam. So I can't give specifics just yet.

Is there a diagram somewhere i can use to check the vacuum routes? I didn't see one in the engine compartment anywhere.

Also the airbox is gutted, tho this problem existed before I did that, tho not as bad as it is now.
DeeMutz is offline   Reply With Quote
Old 05-31-2007, 10:59 PM   #4
Senior Member
True Car Nut
 
Join Date: Feb 2006
Location: Somewhere different on the globe every month....
Posts: 2,896
Thanks: 0
Thanked 0 Times in 0 Posts
Cheetah is on a distinguished road
Default

That sounds like an IAC to me also
Cheetah is offline   Reply With Quote
Old 06-01-2007, 10:09 AM   #5
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

Could be an IAC.. which is covered when the TB is cleaned.

The gutted box shouldn't be an issue. As for vacuum diagram.. take a look on the radiator support..typically there is a diagram there. If not..we can get one for you ... uh..somewhere..
BillBoost37 is offline   Reply With Quote
Old 06-01-2007, 07:21 PM   #6
Member
Posts like a V-Tak
Thread Starter
 
Join Date: May 2006
Posts: 34
Thanks: 0
Thanked 0 Times in 0 Posts
DeeMutz is on a distinguished road
Default

ok, fuel pressure is @ ~42psi when running and ~50psi when i turned the car off.

the TB cleaning is going to have to wait till Sunday since neither parts store has a gasket in stock.

I picked up some Seafoam. Should I run it through before or after I clean the TB?
DeeMutz is offline   Reply With Quote
Old 06-04-2007, 11:36 PM   #7
Member
Posts like a V-Tak
Thread Starter
 
Join Date: May 2006
Posts: 34
Thanks: 0
Thanked 0 Times in 0 Posts
DeeMutz is on a distinguished road
Default

hmmm, weather here is NOT cooperating and I don't have a garage so the TB cleaning will have to wait till the weekend (weather permiting)

I have a MAF comming from sully, hopefully that will fix the hard time starting. If it dones't, from what I have been reading on the site here, it might be a ICM. Dunno for sure.

I also am waiting on the seafoam. After searching the forums, I haven't found the answer I am looking for with it. Like a nice picture with a big red arrow pointing to the vacuum hose I need to use, hint hint :p
DeeMutz is offline   Reply With Quote
Old 06-07-2007, 12:43 AM   #8
Member
Posts like a V-Tak
Thread Starter
 
Join Date: May 2006
Posts: 34
Thanks: 0
Thanked 0 Times in 0 Posts
DeeMutz is on a distinguished road
Default

well, weather was nice enough for me to change the brakes today. I'm gonna hold off on the TB cleaning till the weekend since the Bonnie is also my Daily Driver

Anyone have any luck finding a vaccum route? I'd like to double (and triple) check all of them this weekend as well

TIA

Dave
DeeMutz is offline   Reply With Quote
Old 06-07-2007, 02:33 AM   #9
Senior Member
Posts like a Corvette
 
Join Date: Jan 2007
Location: San Diego, CA
Posts: 1,451
Thanks: 0
Thanked 0 Times in 0 Posts
agrazela is on a distinguished road
Default

Could be a dirty/malfunctioning MAF...did you say you are getting a new MAF sensor?

Are you throwing any codes / SES lights?
agrazela is offline   Reply With Quote
Old 06-07-2007, 08:13 AM   #10
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

I doubt the ICM is giving you a hard start. That would typically be a pre 92 car.
BillBoost37 is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Revs up and goes back to idle speed repeatedly with pedal floored Timmah Buick 16 08-28-2013 11:00 PM
95 Lesabre starts,dies-starts,dies munkee Buick 4 07-28-2008 07:53 AM
94 BVille starts fine than dies (FIXED) markkleb 1992-1999 28 07-10-2007 10:13 PM
95'SE Starts,Dies,Starts,Dies... kc7oer 1992-1999 13 04-13-2006 10:17 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 08:58 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.