Originally Posted by SgtB,Feb 7 2009, 12:04 PM

The Idle Air Control Valve is located on a small passage around the throttle plate. If you pop your intake off you'll see a couple holes in front of the throttle plate. One is the iacv port. When the ecu sees a cold temp it cycles the iacv open and closed very quickly to allow a metered amount of air in. This small amount of air is plenty enough to raise the idle under no load.