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steele13 1/5/2013
1988 Honda Prelude 2.0 Si 4WS 4 Cyl 2.0L - Engine
The idle on my vehicle revs up and down repeatedly when it reaches operating temp. What could it be?
I believe it is the electronic Air Idle Conrol Valve but wnt to see if anyone has come across this problem and may know exactly what problem may be.
1 Answer
  • Jimm
    Jimm 1/5/2013
    Quite possibly the IAC valve is faulty, may also be related to a simple engine vacuum leak or hose connection. Check these things first before replacing the IAC valve.
    Try the many on-line auto parts sources, such as; or for the replacement parts. For example, they (RockAuto) list the IAC valve for around $146.00 for your vehicle.
    They (Rock Auto) list the

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