the valve allows air to bypass the throttle plate when the throttle is closed. You have to clean it with intake cleaner to remove all the carbon build-up inside the valve.
A tip would be, when the vehicle doesn't start or if it stalls, try holding your foot on the accelerator very, very lightly, this will open up the throttle plate and allow air to come in. If the vehicle doesn't stall when you have the foot on the accelerator, you have a faulty IACV. Sometimes cleaning the valve doesn't work, and you must replace it.
Wednesday, October 28th, 2009 AT 12:00 PM