I just cleaned my IAC valve and could not remember ever replacing it, so it may be the original. Do these thing wear out or go bad???

 

Sure they go bad...but ususally thy die and don't move in/out. Can m\be monitored easily enough with a scan tool by watching the IAC counts.

PS...if it's still out, do not appply voltage to it, unless you're in a really confined area and you can locate the pintle

Also, clean the passage ways and seat in the TB as well.

 

I think the count is controlled by the ECM and what you are seeing on the scanner is what the ECM wants. I dont think the count can be used to verify that the pintle is actually moving, only that the ECM is commanding the pintle to move.

 

No, the IAC motor is a phase motor, I/e "stepper count" and what you read from a scanner is the counts off the motor, and it's current location/postion (as it tells the ECM where it is at)

 

if you take it out and there is "slop" or play in it when you try to move it, get a new one. And you'll notice smoother idle and shifts on a stick car.

 

Thanks for all the input.

 

My TA started normally. but after it warmed up it would idle high. So I checked the IAC and it was broken. So I replace it and set it and now it won't start and stay running without giving it a little gas for a few minutes. After it is warm it seems to idle pretty smooth.

Does anyone know if the ECM is different for a stick car? Even in neutral the idle still doesn't want to come down til a complete stop. I'm a t-56 conversion on an original T-5 but I pulled the ECM the other day and it was a reman from 1995 with a jet chip from 1991. Anyone in J-ville FL have all this tuning equipment they would like to rent? Anyone want to get together and help each other rebuild a couple T-56's?