Your Mitsubishi’s IAC (Idle Air Control) valve can become dirty and clogged over time. If your Mitsubishi stalls frequently or begins to have a strange idle, it’s time to clean the IAC valve. A dirty IAC valve cannot control the engine's idle speed very efficiently--hence the poor idle and frequent stalling. Cleaning the IAC valve involves a few easy steps.
Locate the IAC valve. It is a cylindrical unit that's about three to four inches long, located on the throttle body. Refer to your owner’s manual for its exact location on your Mitsubishi.
Detach the IAC valve harness. Remove the two bolts that secure the valve into the mount using a socket wrench. Pull the IAC valve out of the mount.
Use throttle body cleaner to clean the inside of the holes on the valve. Clean any built-up debris using a wire brush and rag.
Insert the IAC valve onto the mount and replace the bolts, using the socket wrench to tighten and secure them. Reconnect the harness to the IAC.
