Like the idle speed actuator and automatic choke on a carburetor, the idle air controller (IAC) helps warm up
the engine quickly with a fast idle and restricted air flow (for a richer mixture), then maintains a consistent
idle speed when the engine's at operating temperature. A failed IAC can cause a rough idle and Check Engine
light. If you've narrowed it down to the idle air control valve on your vehicle, shop Advance to find the part
you're looking for!
Back in the days of carbureted engines, the automatic choke and fast-idle cam were responsible for
restricting airflow into the carb and keeping idle speed up until the engine reached operating temperature.
Today, that's taken care of by the idle air controller. A failed IAC can result in a high idle, lumpy idle
or an idle speed that’s too low. It can also lead to stalling as the engine can't take in enough air. In
extreme cases, your vehicle won’t start. Shop Advance to find the correct OEM-quality idle
air controller for your ride.