Originally Posted by thebettersol

Its attached to the bottom of the throttlebody, has 2 coolant lines connected to it. You will notice on the right side of the valve (it will be the side pointing at you and it is the more round side), there will be 2 small cap screws holding the cap on. pull the cap off and you will see the white plastic plunger with the ring around it. The ring has a notch in it. That is what you tighten.

Go ahead and clean the IAC valve screen though just to be safe.