WhiteAP1ftw

So I was doing some other things under the hood (starter replace + compressor replace) and I figured while the car was down I would clean out the IACV. I had had the "RPM drop and almost stall" problem on about 1/15 stops while driving.

Either way I pulled off the IACv and sprayed it with TB cleaner from Honda. I did not separate the black plastic part from the metal, as I didn't have a 5star bit (never even seen one before). So it was kinda a half ass job. I used Qtips and cleaned out as much of the carbon build up as I could. I let it all dry and when I started the car it started idle bouncing from 1500-2500 and won't stop.

I cleaned it a second time (same way) and let it dry. It is still idle bouncing and won't stop. Anyone out there know what is goingon or have suggestions on how to try and fix it? I reset the ECU each time too....

Please help. I would rather not buy a new iacv if I don't need to...

Billman250

In cleaning it, you actually bound up the rotary shaft.

Take the black half off, and spray the rotary shaft with wd40. Then spin it with you fingers until it spins really free. Some people cut a slit in the bolts to get them out with a flat screwdirver.

Your idle will be fine after.

WhiteAP1ftw

That's what I was afraid of...

I would rather not cut the screws to use a flat head. I work at a car dealership. I will stop by there and see if anyone has a 5star key first. As always, Billman to the rescue.

PM me your shops address so I can send a thank you for being such a great asset to the s2000 community. Please.

MikeO

WhiteAP1ftw

So I took the IACV apart and just as you said Billman, the shaft was sticky when I tried to turn it. After spraying with wd-40 it loosened up alot. It spins much nicer but I can still feel resistence/scraping or something inside that upper bearing.

Billman, would you reccomend buying a new one, as I may have "cleaned" all the bearing grease out by cleaning it so much? Is it okay to feel a bit of roughness when you spin it with your fingers?

Thanks again Billman.

Billman250

Spray both bearings if you can see em, and the shaft part that is in the IAC rectangle windows. Whip that shaft around with your finger like you were spinng a top. It should completely free up.

It likely a piece of hard carbon or contaminant on the shaft window itself, bearings are likely fine.

WhiteAP1ftw

Thanks Billman. I will try spraying the crap out of the bearings more and spinning it harder. It is 95% smooth compared to how gummed up it was when I first got it apart. Just feel a little resistance.scraping feeling when I turn it slowly by hand.

You are great!

WhiteAP1ftw

FIXED


Thank you Billman250! Still waiting on instructions to send you a gift...

Billman250

Thanks for the many cups of coffee!

SgtB

Hey Bill, have you ever found a IACV rotor that has a burr on the sealing edge? I have one for some reason that barely catches about 1% of the time when I spin it by hand. Car idles fine, but I just though it was strange.

Mike G

i know its an old thread, but my idle was bouncing around after cleaning the iacv. turns out it was the shaft as billman mentioned. thank you.