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1991 Honda Civic

Question: IDLE UP & DOWN WHEN ENGINE IS HOT

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garfield_1, Hacienda Heights, CA, April 11, 2009, 14:00
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when engein is hot idle guns up &down they tell to flush air control valve ??

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  • Answer #1

    patrick mannion from Greg Solow's Engine Room, April 11, 2009, 15:23
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     Master

    fluctuating idle speed on a Honda can be caused by low coolant in the cooling system. Cleaning the throttle butterfly and throttle housing from carbon build up may improve the idle. (remove the air intake boot with the engine off, clean the throttle butterfly with the accelerator fully depress with "Chemtool" or similar product on a cloth or by using an old tooth brush. Unfortunately there are many things that can effect or cause an erratic idle.

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