Cold Engine miss? - 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 03-18-2005, 09:54 PM   #1
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Default Cold Engine miss?

Alright, its done this since the day I bought it, but I'm just getting around to asking now.
When its cold, weather its -30 or 70 above out, makes no diffrence. Usually happens on initial start up. I start it, it idles itself up to 1200 then slowly back down to 700 or so, but u can feel it missing, its like its almost running on 5.5 cylinders, its not like pulling a plug wire off and running it like that, usually once your driving its fine, like at red lights and all. Every now and then when its hot it will idle like that, u can feel the miss shake the car slightly, my msd coils and wires didnt make a diffrence, as the stockers did the same thing...any suggestions, im going to scan it for codes as well, hopefully that might lead me somewere...any ideas though?
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Old 03-18-2005, 10:05 PM   #2
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What plugs are you running and what do you have them gapped at?
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Old 03-18-2005, 10:30 PM   #3
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they are the factory gap settings and they are the basic AC delco stock ones, there new.
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Old 03-19-2005, 02:22 AM   #4
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I seem to be having the same exact problem. On intial start up the idle sometimes will be real rough for a few seconds but when im driving or idling at a light its fine. I just changed my spark plugs too, i switched to the NGK'*. I put them in as they were gapped because I was told they are already pregapped. I didnt have this problem before I did the plugs so I am kinda short for ideas.
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Old 03-19-2005, 04:19 AM   #5
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If the issue is only there when you first start it and goes away after driving for a bit I would think it has to do with air/fuel delivery. Once its warmed up and the o2 sensor kicks in the pcm can make adjustments as necessary. But when its cold and not listening to the o2 sensor any issues will show up more.

Tough to say though, sometimes these things end up something you'd never think of. I'd suggest hooking up a scantool and watching your o2 mv. Short of that maybe go over all the hoses and bend them to check for small cracks.

Just a thought
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