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I am sorry, not sure how else to describe it. When in park and the engine on, the engine "revs" and drops, revs and drops, a rhythmic idling.... once in drive it stops.
It's also overheating but I don't know if this is related.
1988 Honda Prelude, just purchased back in April. Anyone know anything about this?
Well, the overheating wont be related I dont think. Ill ask my brother, he had the same problem on his 1990 Si. I believe it was a quick-fix. Id guess a vacuum leak, but Im not sure if that causes rythmic idling problems or not.
My son has a 96 Toyota Forerunner. When you start the car the engine 'revs' until he puts the car in gear. Is this IAC valve something a novice can check or do we need to take the car in? If so - how do you clean the carbon buildup? Thanks!
If I were you I'd buy a Haynes or Chilton repair manual and do it yourself. It's not a complicated job so pretty much anybody with somewhat basic mechanical skills can do it.
I don't think it can be cleaned but I could be wrong, it is best if you just replace it with a new one.
I replaced the one in my old '87 Trans Am myself, but it was easy to get to. When I removed it I couldn't believe what I saw, the 21 years worth of crud on there was amazing. I have heard of some people cleaning them with carb cleaner, but it's a cheap part so I recommend replacing it. I think I paid $23 for it at Auto Zone.
More than likely on a prelude it is indeed an Idle Air Control valve (IAC). Could also be a vacuum leak such as from the intake gaskets or vacuum lines. This will also cause surging. And if it surges while driving at speed then a stuck EGR could be the culprit.
Last edited by observer53; 03-28-2013 at 10:39 AM..
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