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Thread: IACV Problems
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Old 04-28-2018, 10:18 AM
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Re: IACV Problems

Originally Posted by Eclipse99fwb View Post
Also you should let the ecu relearn its idle after you check for leaks, throttle cable, etc.
Fix problems first:
- find & fix any vacuum leaks
- clean the throttle body bore & throttle plate
- clean the IACV (skip since you replaced and if you know it is activating by testing solenoid like i mentioned above)
- make sure the throttle plate closes completely
- - (mechanical stop-screw is only used to prevent it from wedging stuck closed)
- make sure the throttle cable goes a bit slack
- - (throttle cable is never used to adjust idle)
- make sure the cooling system has no air pockets (they confuse the system) should be okay since you bled the system but never hurts to do again.

Find the parts first. (For anyone else in the future)
- Idle-Air Control Valve (IACV) is usually bolted to the back of the intake manifold
- Idle-Air bypass screw is just above the throttle bore, recessed in a hole in the throttle body, it's usually a brass screw with a straight slot for a screwdriver

- Warm the engine up completely.
- Turn off all loads (AC, blowers, defoggers, stereo, EVERYTHING)
- Unplug wire harness from IACV (engine will almost stall)
- Adjust the idle-air bypass valve for 550 RPM (keep in mind the first notch after 0 on our tach is 500rpm not 250)
- - (PLEASE anyone with specific RPM for certain years chime in)
- Turn the engine off & plug everything back in

Now you should force the system to re-learn the idle behavior:
- Allow the engine to cool down completely
- Reset your ECU (different years pull various fuses) i cant remember the exact fuse on ours but i know its in the fuse box on the passenger side dash i think its the clock fuse.
- Start the engine without touching the gas pedal
- Allow it to run & warm up completely without touching the gas pedal
I didn't get alerts to this post, just seeing this now. I went ahead and bought a used ECU from ebay for $60 and very skeptically and painfully paid a locksmith $60 to reprogram my key to work with the new ECU. A few short moments later we cranked the engine over and I heard a smooth idle for the first time, IT'S FIXED! Thanks for the input and help on this.
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