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i had the same problem in my 98 prelude, check the antifreeze in the engine and cooling system. if it is low, replace it. also, check the engine temperature on the dash, make sure it is below the middle line.
Is it revving up when the car is idling? Is the idle speed higher than it should be? If so, you either have a vaccum leak, or your idle air control valve is bad. Sounds like the second, but i'd take it by autozone and have them pull the check engine light codes to be sure. They do it for free. If they say its a vaccum leak, let me know and I'll explain how to find it.
A vacuum leak either from a hose or the intake rubber tube running to the throttle body. Any air that enter's the engine other than the throttle body, will cause this condition. This is the best case scenario, worst case would be an intake gasket.
the light will only turn off when the ABS system fault that caused the module to turn the light on is repaired, to do this u need to have the dealer test the system for fault codes, most likely one of the four wheel speed sensors will be defective.
This possible solution is also weird. I have a '91 Prelude Si also- GREAT car. Do you have anti-lock brake option? If you do, check the fluid level in the anti-lock reservoir. My Prelude did this revving thing twice, and while checking under the hood to see what the heck was going on, I discovered the brake fluid level was very low. I topped it off, and after giving up trying to figure what was wrong, I restarted the car, and no revving problem. I don't know why this is, but it worked for me twice. Countrycurt0
The problem is likely in the injection module which is located in the dash right behind the flip down tray to the right of the flip down fuse door the the left of the steering wheal.To test simply rapidly slap the fuse/vanity flip down door area while starting the car and it will start.I have had 5 preludes and all have the same problem a replacement is 150 or you can sotter all the connections on the board inside the fuel injection module.This will fix the problem as the original connections develop miniscule cracksAll preludes have this problem in really hot or cold weather