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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 08-15-2010, 10:43 AM   #1
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after i fixed the idle air control my car runs great but when i start it up the idle tends to be a little rough and loping any ideas on what could be causing it im leaning towards vacuum problem but i will have to double check cause i thought that i had replaced all the vacuum lines already, and i hope its not a worn lobe on the camshaft.
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Old 08-15-2010, 11:10 AM   #2
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Worn lobe it would be lumpy all the time. I would check you Fuel Pressure also look into changing your fuel filter. Have you changed your plugs and wires recently? Also I would test your coils. Here'* the link to do that. https://www.gmforum.com/trouble-shooting-test-procedures-141/testing-coils-spark-plug-wires-278818/
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Old 08-21-2010, 01:52 PM   #3
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I had a similiar problem with my '94 bonneville se, 3800 series 1. Idle would be about 500rpm and the car would surge alittle but clear up once i stepped on the gas. Mine turned out to be the EGR valve, once I replaced that she smoothed right out. For me about $65.00 new and about 20 minutes of wrench time.
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Old 08-21-2010, 10:59 PM   #4
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One area I found that will give you a lopy idle is a cracked EGR tube. The only way to check this is to remove it, hold it up to the light and look for a crack.
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Old 08-25-2010, 08:44 AM   #5
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wow thanks for all the suggestions and yes night i have checked all those and thanks for the info about the lobe, looks like the EGR valve is next to be checked
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Old 08-25-2010, 11:44 AM   #6
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Did you do an idle relearn when you finished installing the new IAC?
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Old 08-26-2010, 11:17 PM   #7
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what do u mean by idle relearn i dont speak greek lol probably not i was in a hurry putting it on because i had to go to work that night and only have the one car. also does my 92 bonnie even have an egr valve
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