Odd idling - Page 3 - 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.

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Old 02-16-2008, 08:25 PM   #21
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Quote:
Originally Posted by krisfulton
Ok...lets see, this is what' i've done:

1. New plugs
2. New fuel filter
3. New PCV
4. New Idle Air control valve
5. New wires
6. New alternator
7. Oil change
8. Transmission flush
9. New transmission filter
10. cleaned the mass air control valve
11. Cleaned Ignition Control Module and it tested fine...went to Napa

I got a new O2 sensor that I'm going to put on there, if that doesn't help then I'm going to look at the cam sensor. Fuel pressure is great...getting plenty of fuel.

and if you're not getting an SES light, you don't have a problem with your cam sensor. if you do have an SES light, you can get the codes by following the procedures listed in Techinfo.

also, pull off your battery cables, check them for corrosion, clean them very well, including under the boots, you can pull them right off, and then reinstall them with dielectric grease inside the boots and coating the connections to the battery. after that is done, leave the negative cable disconnected overnight and report any differences in the morning.

Anything I've missed?
alright, there may be something more to this as well...

what plugs did you use and what ignition wires did you use?

and what brand is this o2 sensor that you just got. don't install it until we know, because its important.
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Old 02-17-2008, 05:07 AM   #22
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The rough idling started prior to changing everything, hence me changing everything. I don't recall the plugs and wires I put in, I do know that I got the lifetime warrenty on the wires. As for the O2 sensor, it is the Bosch brand. I did clean the MAF with alcohol as suggested and it did a little better. Hell everything I've done, so far, as made it a little better, but not quite there yet
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Old 02-17-2008, 05:10 AM   #23
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Oh yeah, as for the battery, one of the previous owners converted it to a standard battery. I put new post connectors on and there is very little corrosion on the positive side, which I cleaned, and there was nothing on the negative side
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Old 02-17-2008, 01:54 PM   #24
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As everyone else is gonne tell you, take the bosch o2 sensor back and get the delco, because bonnevilles dont like bosch sensors. Im pretty sure that you have the two wire type sensor located on th eback side of your exhaust manifold just below your blower housing. spray the old o2 sensor with some penetrating catalyst and let it soak overnight if you can. and of course make sure the engine is cool when you take it out. I had a 92 lesabre with the same engine and it idled like crap till i changed the o2 sensor (with a bosch coinsedentially) and it completely fixed my problem
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Old 02-17-2008, 06:22 PM   #25
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I have only the single wire for my O2 sensor, does that make a difference?
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Old 02-18-2008, 01:58 PM   #26
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Im sorry, Your right it was a single wire on those years. my bad. So have you changed it yet?
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Old 02-18-2008, 05:33 PM   #27
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It would be helpful if you can describe more precisely what is happening. It sounds like you are idling at 800 rpm and then the engine dies. When it idles at 800 rpm, how is the idle quality? smooth? rough? Does it die as if you turned off the key, or does it begin to cough and sputter and slow down until it stops? Any check engine light?

A detailed description will help narrow down the list of components likely to be causing the problem and save you time and money.

Suddenly stops as if you turned off the key - electrical problems including a bad PCM, ICM, CPS, bad grounds, corroded battery cables, worn ignition switch.
Coughing, rough idle - vacuum leak, MAF, O2 sensor, low fuel pressure
Idle with miss - plugs, wires, coils, injector
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Old 02-18-2008, 07:08 PM   #28
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No, I have not changed it yet, but I need to do it regardless if it'* a Bosch or not. I can pick up a Delco one when I get paid agian. Even if it temporatily fixes it, until I get it

Bill - please read all of the post to see what I've done. But let me see, it will just idlle and die, NO check engine lights, no nothing just stops
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Old 02-18-2008, 08:35 PM   #29
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Ok it does look like it'* the O2 sensor, the wiring is loose on the top of the sensor. I don't have the proper socket to take it off, any other suggestions??
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Old 02-19-2008, 01:53 AM   #30
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Quote:
Originally Posted by krisfulton
Bill - please read all of the post...
Yep, did that before I posted, Kris. That'* why I asked you for specifics.

Quote:
Originally Posted by krisfulton
...it will just idlle and die, NO check engine lights, no nothing just stops
So, I would look at: internally corroded battery cables, grounds, worn ignition switch, crank position sensor, ignition control module, and powertrain control module.

I realize you have already addressed some of the items mentioned above, but I included them in my advice because other folks may want to know what to look for if they are experiencing a similar problem. And, sometimes we don't always get things fixed right the first time we try.
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