October 30: LEMON manuals on a temporary server, it is slow and having issues, download the manuals you need! Later in November we will switch back to the fast server.

Idle Air Control (IAC) (Fuel Injected Models, Except CADILLAC 4.1L V8)

The IAC valve is an electrically-driven actuator which changes the idle air flow around the throttle plate according to commands from ECM. The IAC controls air flow in a similar manner as the ISC to maintain low idle speeds while preventing stalls due to engine load changes.