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.

Rough Idle

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Old 02-03-2004, 11:09 PM
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Default Rough Idle

My 97 has a little bit of a rough idle, usually when its cold/warming up. Anyone have ideas to what it could be?
Old 02-04-2004, 03:11 AM
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Lets start simple. How old are your plug wires? They may need replacement.
Old 02-04-2004, 06:09 AM
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Try cleaning your throttle body. That did wonders for me.
Old 02-05-2004, 01:09 PM
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I gained a rough idle after I put in my K&N. I have new O2, plugs, wires, and I use injector cleaner often. I always use 89 or higher gas too. Can't get rid of it. So I am just leaving it rough idle and learning to live with it.
Old 02-05-2004, 03:08 PM
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I'd buy the throttle body. I had the same problem at 75k miles. That did the trick for me. But to get it REALLY clean, you need to remove it.
Old 02-05-2004, 09:37 PM
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You bought a new TB or you cleaned it?
Old 02-05-2004, 10:33 PM
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No i bet he meant clean it. It takes about an hour to take it off, clean it, and put it back on. Fun task for a shadetree mechanic like me. Once i got the TB out, i removed all the electrical stuff--TPS, MAF sensor, Idle control valve, and put it in a bucket of gas and just scrubbed till it shone like new.
Old 02-05-2004, 10:35 PM
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JD is right on the money.
Old 02-06-2004, 05:19 PM
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Awesome... Another cheap fix I'll have to try
Old 02-07-2004, 10:39 AM
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I'll put it on my list of things to do this summer.


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