1988 chevy k5 blazer tbi 350ci. Won't idle down even after being warmed up. Changed coolant temp sensor made no difference. What next? Need to smog this beast so I'm a little perplexed.

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Asked by May 27, 2014 at 12:22 PM

Question type: General

Will not go to closed loop. Runs fast and smells a little rich which I figure that the cpu is being told the engine is cold. I haven't yet checked the timing but I'm not sure that will tell me anything. Did throw a code for egr. I cleared it and am waiting to see if it returns. Yet still I don't think this will cause the fast idle problem. I never seen that cause this condition. Anyway I could be wrong but any suggestions would be nice. Thanks, Jack

2 Answers

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Dam- clearing CLEARING A CODE OR REPLACING A SENSOR FIXES NOTHING!!!!

10

dude im having the same problem with mine. i have a idle around 1150, which is rediculous. ive replaced my EGR, ive replaced my air filter (doesnt really effect it) but ive redone most my vacuum lines and ill be redoing the rest of them today. ive heard it could be the IAC valve, but i wouldnt know from xp. i have an 88 k5 as well. let me know if you solve the problem

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