Crown Victoria V8-281 4.6L SFI (1998)
Idle Speed/Throttle Actuator - Electronic: Description and Operation
The Idle Air Control valve (IAC valve) controls engine idle speed. The idle air control valve is mounted on the intake manifold and allows air to bypass
the throttle plate. The amount of air allowed to bypass is determined by the Powertrain Control Module (PCM) and is controlled by a duty cycle signal.
