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high idle

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Old 10-23-2010, 10:46 AM
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high idle

High idle 93 Honda prelude SI H231a1 2.3 DOHC.
Need help with my high idle problem itís idle about 1500-1800 rpm (warm or cold. I have changed out the IACV and still have the same problem. I allow the car to warm up and I plug the bottom port of the throttle body which I guess is the port for the FICV there is no vacuum and no change but when I plug the top port (IACV) Rpm return to normal. If I disconnect IACV the RPMs do drop and surges. Also When I am in gear with foot on the brake the RPM is normal about 700. Need help please Thanks
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