Honda-Tech - Honda Forum Discussion - Revs up and down when cold

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Roddgunn

05-07-2007 03:22 AM

Revs up and down when cold

I have a 93 Honda civic GLI stock standard. Some days but only on cold ones my revs will constantly go up then down. Even when the engine has warmed up. does anyone know what cold be causing this. Thanks

homicydalboy

05-07-2007 03:30 AM

Re: Revs up and down when cold (Roddgunn)

IAVC (idle air control valve) it is on the back of the intake manifold and has either been clooged gotten dirty or went bad.

TPS (throttle position senson) out of adjustment found on the back of the throttle body.

BAVL (bad ass vaccum leak) self explanitory

loup05

05-08-2007 08:54 AM

Re: Revs up and down when cold (homicydalboy)

i agree check the iacv most of the time thats the case if not a vacuum leak

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