rough 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.

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Old 07-15-2005, 08:03 PM   #1
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my car has a rough idle... like it will idle smooth and then the rpms will drop when ever its in gear and im stopped... any ideas.?? i already changed the plugs wires
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Old 07-15-2005, 08:48 PM   #2
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The RPM'* are supposed to drop when you're in gear and stopped


As for the smoothness.......Check your vaccum lines for leaks.
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Old 07-15-2005, 11:33 PM   #3
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After checking for vacuum leaks, I would say the next step is to clean your throttle body. Does the engine stumble an excessive amount when the AC compressor kicks in?
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Old 07-16-2005, 05:53 AM   #4
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Good call JDB

If those 2 ideas fail...check your intake bolts and make sure they are tight.
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Old 07-16-2005, 03:07 PM   #5
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i dont run my ac cause im too lazy to get it recharged but like when its in park idleing it will be idling righ bout 800 rpms and then all of a sudden it will like drop to like 300 400 rpms its like idle surges
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Old 07-16-2005, 03:09 PM   #6
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Quote:
Originally Posted by 92se
i dont run my ac cause im too lazy to get it recharged but like when its in park idleing it will be idling righ bout 800 rpms and then all of a sudden it will like drop to like 300 400 rpms its like idle surges
u check ur MAF???
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Old 07-16-2005, 03:18 PM   #7
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Quote:
Originally Posted by Kennginn
Quote:
Originally Posted by 92se
i dont run my ac cause im too lazy to get it recharged but like when its in park idleing it will be idling righ bout 800 rpms and then all of a sudden it will like drop to like 300 400 rpms its like idle surges
u check ur MAF???
Kennginn, maybe you should tell him HOW and WHAT to check on the MAF, with all the proper procedures and warnings?
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Old 07-16-2005, 03:42 PM   #8
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http://www.bonnevilleclub.com/forum/...t=cleaning+maf


U can use this link to a thread to clean out you TB as JDB had mentioned, and also for cleaning the small filaments on the MAF sensor to clean them.
BE CAREFULL WHILE CLEANING THE FILAMENTS!!! THEY ARE EXTREMELY FRAGILE.
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Old 07-17-2005, 11:34 PM   #9
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im not retarded maf mass air flow sensor....and its not that
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Old 07-17-2005, 11:37 PM   #10
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Quote:
Originally Posted by 92se
im not retarded maf mass air flow sensor....and its not that
Well now that we got that out of the way.....Jeees.....

Anyways, clean your TB yet?
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