That looks like what happens to mine when I unplug the battery and plug it back and drive with the AC on. It takes time to learn. It might not be the same issue with yours though.

 

How much should IACV go out when turned on????

 

I have a pic of my bad one here :
https://www.evolutionm.net/forums/ev...ge-my-isc.html

Note: when you reset the IAC, the car will need an idle learn and driven a lot to re-learn how much to progress when coming to a stop. Most of the time it will stall for the first 3 stops,LOL.

 

I cant see those teeth.

 

I've never seen any teeth. I'm talking about the crack in the plastic.

 

Can anyone tell me???

 

This is from my DSM. Maybe the operation of the ICV is the same on an Evo, maybe different.

On a DSM, the ECU didn't keep track of where the plunger in the ICV was located. The ECU only sent raise and lower signals until the targeted rpm was achieved. When the engine was shut down the ECU didn't know where the ICV plunger was located. So, at start the ECU would command the ICV all the way to the end of travel and then run it back a certain number of steps.

 

OK, but how much should it go out??? 1/16, 1/8, 1/4 or 1/2 of an inch???

 

Its not a question of how far - that is decided by the ECU and will vary car to car. The ICV should operate quickly and not with a loud sound at start. This all has to happen while you are turning the key.

 

Lol, did you read my previous post at all ? Some have teeth some dont. Thats not the part of the IAC valve that I've ever seen go bad.

 

@ dvd mi - My car is doing the same thing. Have you found a fix for yours? Was it the IAC?

 

The best way is to read resistance of the coils

 

You mean of the pins.

 

Replaced IACV. Did not fix the problem.

 

If I take the IACV out of throttle body and turn ignition on, how much should it move (distance). How many times should it do it???