Rough idle around 1000 - Update 1/16/08, Wasn't PCM. - 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 12-30-2007, 11:58 AM   #21
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I may be on to something, I think the MAF may be bad. Should I unplug the MAF while running, or before I start it?
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Old 12-30-2007, 12:15 PM   #22
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...Technical Ted came down to help me with mine and we unplugged it when the car was off. Then..it wouldn't even stay running. It didn't make sense based upon what other'* have said here... but regardless, once I put the new one on, no more problems.
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Old 12-30-2007, 12:28 PM   #23
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William,

I think we are basically troubleshooting the same type problem. I pulled the connector off the MAF when the car was idling. The idle will jump up when you first remove the connector and then the idle will go down a little when you reconnect it., but just for a short second. If it acts this way, then your MAF is prob good. I read through your post quickly, and I didn't see if you have cleaned your MAF sensor. I would recommend that before you do anything else. I cleaned mine and it didn't change anything. The info to clean the MAF is in techinfo. BTW, I think my problem is my MAP sensor. I'll know in afew minutes.

Good luck.
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Old 12-30-2007, 12:32 PM   #24
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Mine'* ok. I unplugged it while running, no change in idle or how it was running. Then I unplugged it with the car off, started right up. So, my MAF is ruled out of this. Yes, it'* been cleaned, when I put my supercharger back on.
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Old 01-02-2008, 12:10 PM   #25
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Checked for vacuum leaks with the starting fluid. Seems to be no leaks. :(

I have thought of everything possible for a bad idle. Also need to mention that the car is sometimes hard to start first thing in the morning, even with alot of gas in it, yet the fuel pressure is fine, and the FPR is good, no smell of fuel in the line.
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Old 01-02-2008, 02:21 PM   #26
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Quote:
Originally Posted by Bonneville92V688
I never really mentioned this, but I do also have hard starting when first starting in the mornings, sometimes it happens, sometimes it doesn't. Fuel pressure is in spec also.
I just fixed this on my 96 se. BAD ECT sensor. I'm not sure if you have one on your year of bonny, but if you do I would be willing to bet thats your problem. when your car is cold in the morning ohm out the sensor before you start your car.. Depending on what the temp is outside the sensor should have a certain resistance reading. See the table here http://www.bonnevilleclub.com/forum/...e=article&k=24

Hope this helps.
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Old 01-02-2008, 03:43 PM   #27
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You might be on to something. This just may explain my stinky exhaust and terrible gas mileage. I am going to test the ECT and see if it'* the culprit. I know my ECT for the gauge is fine.
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Old 01-05-2008, 12:29 PM   #28
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where is the ECT?
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Old 01-05-2008, 09:28 PM   #29
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Hmm, a little interesting thing to add to this. Turned onto a road today and opened it up to about 40, let off the gas quickly, and it STALLED. Yes, stalled. Tach fell to 0, and was dead. Pulled over and it started right back up. Good thing too, I would have got hit by the semi behind me. Now what? :(
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Old 01-05-2008, 09:55 PM   #30
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you said fuel pressure was good, but did you check the fuel pressure regulator? that wouldnt explain the idle i dont think, but that is what solved my stalling problem (like you mentioned)
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