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Old 04-10-2008, 08:37 PM   #1
theniceguy26251
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88 rough surging idle

2.9L MPI - Will die on cold start unless you bump the gas for a few seconds and keep the idle up around 2K. Later, will often surge and a stop, or just idle rough.
Replaced plugs (suspect), wires, IAC valve, checked intake for leaks. I suspect the plugs because I bought these fancy platinum no-gap plugs. I think I changed too much at once. Ideas?
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Old 04-11-2008, 02:54 PM   #2
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Re: 88 rough surging idle

Welcome to AF, general symptoms, but this is a 2.8 Chevy correct? Check for fuel pressure at the rail, also major vacuum leaks. Check for both injector fuses being good also.
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Old 01-10-2012, 12:50 PM   #3
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Re: 88 rough surging idle

I know this post is 4 years old, but did you figure the problem out?
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Old 01-10-2012, 04:03 PM   #4
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Re: 88 rough surging idle

If you have the same issue be sure to look at the egr also, that was common for not seating causing stalls and hesitation. with the 2.8.
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Old 01-31-2012, 03:46 PM   #5
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Re: 88 rough surging idle

Thanks for the suggestion. The EGR was relitively clean, and I cleaned the IAC valve as well. The problem remained..BUT, I obtained a shop manual and I figured it out.
It seems that the power steering pressure has a lot to do with the idle control when the engine is at operating temp. I found leaking and cracked power steering hoses, as well as power steering pump seals. I replaced them all, and my surging idle issue is gone.
My Cimarron is an '86, lets see if these new hoses and seals last another 26 years.
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