would a bad o2 sensor cause a rough idle? - Page 2 - 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 02-10-2005, 11:16 AM   #11
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Have you had your car scanned?

It could just be something basic, like you needing a tune up?
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Old 02-10-2005, 12:26 PM   #12
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agreed there could be a stored code.....as said before dont just throw parts at this problem
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Old 02-10-2005, 04:50 PM   #13
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yes i have scanned the car there is no codes at all and i have just done recently a tune up on the car
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Old 02-10-2005, 04:51 PM   #14
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I strongly suggest removing the TB for a very good cleaning. With the MAF sensor removed.
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Old 02-11-2005, 01:14 AM   #15
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i did clean the throttle body today and i still have the rough idle, still i have no codes at all
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Old 02-11-2005, 03:38 AM   #16
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We need to get you hooked up with one of our members that has a scantool. Can you put your location in your profile?
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Old 02-11-2005, 07:33 PM   #17
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iam from downers grove, illinois.. i do have a scan tool that shows live data and i looked at it and everything looks good and no codes at all
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Old 02-13-2005, 05:42 AM   #18
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Check for consistant spark at each cylinder then if thats ok....
Suspect a vacuum leak. They are notorious for rough idle with no codes.
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Old 02-13-2005, 07:53 PM   #19
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And after you check everything else suggested,you might consider a stretched timing chain causing the lousy idle if the car has alot of miles on it.I'm guessing it does being a '95.
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Old 02-13-2005, 09:20 PM   #20
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Quote:
Originally Posted by popatim
Check for consistant spark at each cylinder then if thats ok....
Suspect a vacuum leak. They are notorious for rough idle with no codes.
what would be a good way to test for vacumm leaks? also where and what are the common vacuum leaks on the 3.8 series 2 engine?

ttt
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