Fluctuating 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 01-23-2011, 04:42 AM   #1
Guest
Posts like a V-Tak
Thread Starter
 
Join Date: Dec 2005
Location: Longmeadow, MA
Posts: 55
Thanks: 0
Thanked 0 Times in 0 Posts
vegeta6588 is on a distinguished road
Thumbs down Fluctuating Idle

So long story short, I replaced basically everything I need to that should have fixed this problem.

One day I'm driving down the road, I get a check engine light, everything running fine im like okkk? check engine light goes away, so im like great. and later driving driving.. bam, she stalls. I start her back up and she runs for a bit and bam.. stalls again. I pull into a parking lot to check whats up and noticed one of the sparkplug wires connected to the coil is all rusted. Had it towed home and it would start up fine, then slowly die.

What happens is that the car will start up normally. I can rev it and it will be all fine right, then when shes warms up after a min she starts to stall. I can probly keep her going say if i were driving but not if I were stopped or whatever.
Like even after I replaced and checked and cleaned everything, i mean everything dont get me wrong.. what happens is like RPMS go up -like pedal is pushed / gas is flowing to keep it alive- then rpms drop like the CPU stops the flow of gas to correct the high RPMS right? so it goes back and forth until the RPMS go so high and that no gas is needed to correct and then it flips over like a boat in a storm u know what I mean? back and forth up and down til RPMS go to zero and engine stops.

thats my problem. what is the solution?? ok I checked and replaced everything, even going out of my way to replace the Camshaft sensor cause couple people said thats probly it. I did that she ran like a beaut until couple min later died.. maybe replace Crankshaft sensor this time?
is there anybody who knows?? fuel filter was changed 1 year ago, i doubt its the fuel tho. oils fine, uh.. idk what wouldnt be fine.

I even replaced one O2 sensor pre-cat, have the post-cat one but its too damn cold and that one is pretty tight. Ok I did all these things, still NO check engine light, i dont have a scanner anyway..

I'm just hoping when i get around to do 2nd O2 sensor that would cure whats happening.

So like I said, I did everything imaginable basically.. I replaced all new plugs, wires, got a new ignition coil cause one was rusted, plus I changed all 3 couple years ago.
I changed the PCV.. cleaned the ICM (didnt look like it needed replacing, but had some crude I cleaned off pretty good, thought thatd do it with new ignition coil but nope..), I cleaned my IAC, checked MAF..TPS.. made sure nothing like air filter was clogged.. uhh check TPS, checked everything right? vaccum lines batty cables attached and good checked the whole everything, even BUSS connectors under carpet and fuses check out ok. OK? I make sure its all in good shape, its just been awhile for some things that probly needed to be replaced or cleaned anyway.

So i did all that. what am I missing..? a new car?? lol. could it be something with the engine inside like a leak, burnt valve? no leaks that im aware of. I figured itd be with ignition cause of strange fluctuating idle, now my guess is computer and bad o2 sensor but what you guys think??
vegeta6588 is offline   Reply With Quote
Old 01-23-2011, 10:50 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

Since we are close.. would you like me to take a look at it? I should be able to figure it out.

Cam sensor BTW should never cause a car to stall. FSM states that even if they are bad, they'll only cause a 1 in 6 chance of the car starting. Once started, though it stays running. Your issue is kinda sounding like a fuel pump or fuel delivery.
BillBoost37 is offline   Reply With Quote
Old 01-23-2011, 03:25 PM   #3
Senior Member
True Car Nut
 
jwfirebird's Avatar
 
Join Date: Dec 2009
Location: western,ny state
Posts: 9,616
Thanked 563 Times in 481 Posts
jwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond repute
Default

fuel filter, or maybe FPR?
jwfirebird is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Stalls when stopping and fluctuating idle PaulDFixr 1992-1999 11 12-26-2010 01:26 PM
Too high and fluctuating idle on 93 SE mlflagg 1992-1999 9 08-16-2006 11:36 PM
fluctuating temperature gauge in 97 bonneville dancin 1992-1999 5 03-14-2004 09:57 PM
Fluctuating temp gauge? randallons General GM Chat 11 02-23-2004 10:24 AM
Guages fluctuating 1992 3.8l se BarryBoy 1992-1999 26 04-22-2003 11:46 AM


Tags
fluctuates, idle, o2 sensor, oxygen, poor idle

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 09:42 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.