IAC motor testing

[sb3854]

Does anyone know how to test the IAC motor? My 5.0 surges at idle. I have looked at the motor and it is clean with no obvious problems.

[quick5pnt0]

I've never heard of a way of testing them and a local dealer once told me that they don't test them they just replace them...LOL

[87hybrid]

The only "test" is to unplug it. If there's no change in the idle performance, then change it. They can be cleaned once or twice, but this is a temporary fix. I would try the battery disconnect/idle re-learn trick first.
http://www.muscularmustangs.com/idlereset.php

[cabldawg]

My idle is fine most of the time, but sometimes will act up. I have also noticed that when running my A/C it has a consistent 100 rpm surge. What would cause this?

[quick5pnt0]

Do you mean that the idle jumps when you turn the AC on? That is normal.

[cabldawg]

No. the idle will have a constant 100rpm up and down surge with the a/c on. If I turn it off it will sit there and idle steady. At times my rpm's will go crazy jumping up to 2000 or so and hunting. I can usually turn the car off and restart it and it will level back out.