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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 06-02-2005, 06:02 PM   #1
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Default rough idle

Hello all.

My car has suddenly started idling very roughly. Driveability is unaffected. Sometimes the car will die at least once when I cold start it. The SES light comes and goes which is indicative of an intermittent problem.

The only way I know to pull the ECM codes is going through the dealer and they want $85!

Please Help.
--Larry *.
1994 SSEi
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Old 06-02-2005, 10:28 PM   #2
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Try an AutoZone, Advance Auto, or a local friendly mechanic (they will usually scan for free). Find out what the codes are, report them back here, and a vet will jump in with some heavy advice.
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Old 06-02-2005, 10:42 PM   #3
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Maybe a vacume leak?
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Old 06-03-2005, 01:11 PM   #4
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Autozone says they can't scan the codes on a vehicle older than 1996. Is that true?

A vacuum leak was my first thought so I checked all the hoses and they look fine. If it is a vacuum leak, it would have to be a manifold gasket or something along those lines.

--Larry *.
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Old 06-03-2005, 01:27 PM   #5
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You need a better AutoZone - One with an OBD1 scanner....

Fill in your location, maybe a local memeber can help you out
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Old 06-03-2005, 01:43 PM   #6
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I'm in Hillsboro, OR.

Anyone know of a nearby autozone who can help? Last year I tried a different autozone on TV highway but the guy said the computer was unresponsive and he couldn't connect to it. This really bothers me. I'm wondering if I need a new ECM.

--Larry *.
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Old 06-03-2005, 01:46 PM   #7
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correct Autozone cant rerad the OBDII, go to Advance, they can read both but I have had trouble reading the 1/2 on my friends Century
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Old 06-03-2005, 01:58 PM   #8
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I've checked and there are NO Advance auto parts stores in the Western US.

Any other suggestions?

Thanks!
Larry *.
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Old 06-03-2005, 11:30 PM   #9
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Call whatever the local parts stores are named. Ask if they can read OBD1.
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Old 06-08-2005, 01:59 AM   #10
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check it yourself go to techinfo and type in pcm codes and they will tell u how to check on this website i do it to mine so yea... do that lol
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