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 02-04-2004, 12:09 AM   #1
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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?
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Old 02-04-2004, 04:11 AM   #2
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Lets start simple. How old are your plug wires? They may need replacement.
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Old 02-04-2004, 07:09 AM   #3
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Try cleaning your throttle body. That did wonders for me.
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Old 02-05-2004, 02:09 PM   #4
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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.
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Old 02-05-2004, 04:08 PM   #5
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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.
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Old 02-05-2004, 10:37 PM   #6
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You bought a new TB or you cleaned it?
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Old 02-05-2004, 11:33 PM   #7
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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.
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Old 02-05-2004, 11:35 PM   #8
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JD is right on the money.
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Old 02-06-2004, 06:19 PM   #9
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Awesome... Another cheap fix I'll have to try
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Old 02-07-2004, 11:39 AM   #10
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I'll put it on my list of things to do this summer.
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