Bad Idle (gonna fix this once and for all) - 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 04-08-2007, 01:01 AM   #1
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Default Bad Idle (gonna fix this once and for all)

and before Bandit screams "fuel pressure" , I'm just trying to eliminate the simple things, and this is why I ask:
I have:
Cracked Manis (badly)
AND
Bad alternator bearings
Which I know contribute to KR. So, can it?
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Old 04-08-2007, 01:03 AM   #2
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well if the exhaust is Loud enought for the Nock sensor to pick it up at idle im sure t can make it not run right.
also If there is Clean air getting in at idle it can mess up the O2 readings and make the PCM adjust the Air Fuel mis Wrong
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Old 04-08-2007, 01:03 AM   #3
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No.

Your engine can't possibly be bad enough to have KR at idle. Nobody here does.
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Old 04-08-2007, 01:06 AM   #4
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ok i was wrong about the it at idle.

But what about my second thought?
i know iv herd others talk about that.
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Old 04-08-2007, 01:07 AM   #5
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I think it'* his cat. I rode in the car on the freeway and on hard accelerations. I could distinctly smell rotten eggs driving on the freeway and after a couple hard runs, also when he pulled away when he left to go home, I got a strong whiff of it. Also his EMs are VERY cracked, as when we did the seafoam, we had smoke barreling out from under the hood when we started it.
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Old 04-08-2007, 01:07 AM   #6
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Quote:
Originally Posted by bandit
well if the exhaust is Loud enought for the Nock sensor to pick it up at idle im sure t can make it not run right.
also If there is Clean air getting in at idle it can mess up the O2 readings and make the PCM adjust the Air Fuel mis Wrong
Not to get off topic, but has anyone with cracked manis had bad idling problems?
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Old 04-08-2007, 02:06 AM   #7
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It would seem to be obvious. Exhaust leaks before your O2 will skew your O2s and ruin your LTFT and STFT, Thereby causing a rough idle.
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Old 04-08-2007, 02:54 AM   #8
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I disagree. There isn't enough gasses flowing at idle for it to have an effect. My car purred like a kitten at idle with horribly cracked manifolds.

Poor idle is either ignition related or a vacuum leak typically. Or a dirty TB.
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Old 04-08-2007, 02:32 PM   #9
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TB has been cleaned, Ignition has been checked, Vacuum lines have NOT been checked, and it seems like that could be the issue, since I'm not running rich or lean (I don't think) and I've taken them off so many times. I'll get a pressure tester and I'll see what I find
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Old 04-08-2007, 03:17 PM   #10
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Make sure you have no leaks in the EGR stovepipe from the base of the EGR adapter into the SC also.
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