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08-05-2008, 05:42 PM
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Location: in my mind
2,743 posts, read 13,930,976 times
Reputation: 1624
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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?
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08-05-2008, 06:13 PM
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Location: Phoenix metro
20,004 posts, read 74,933,302 times
Reputation: 10326
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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.
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08-05-2008, 07:24 PM
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Location: Middleton, Wisconsin
4,229 posts, read 17,011,294 times
Reputation: 2314
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Blown valve?
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08-05-2008, 07:57 PM
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Location: Floribama
18,576 posts, read 40,141,125 times
Reputation: 18124
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Check the Idle Air Control Valve (IAC), sometimes they get clogged with carbon buildup.
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08-06-2008, 05:18 AM
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Location: Incognito
7,004 posts, read 20,510,346 times
Reputation: 5504
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Quote:
Originally Posted by southernnaturelover
Check the Idle Air Control Valve (IAC), sometimes they get clogged with carbon buildup.
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I was going to suggest this! lol |
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08-06-2008, 06:35 AM
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3,248 posts, read 5,157,806 times
Reputation: 9279
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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!
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08-06-2008, 07:17 AM
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Location: Incognito
7,004 posts, read 20,510,346 times
Reputation: 5504
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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.
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08-06-2008, 10:04 AM
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Location: Floribama
18,576 posts, read 40,141,125 times
Reputation: 18124
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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.
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08-06-2008, 07:49 PM
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Location: Eastern Washington
16,418 posts, read 53,656,030 times
Reputation: 16831
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Do you have a Check Engine Light? Any good manual on the car will say how to read the code, or Pep Boys etc. will usually read it for you.
This probably is the IAC, generally they are not hard to change.
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01-14-2013, 07:55 AM
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Location: Detroit, MI/St. David, AZ
205 posts, read 535,816 times
Reputation: 284
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by request
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 11:39 AM..
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