Explorer 2WD V6-245 4.0L VIN X SFI (1999)
Hitachi Type With Air-Assist Injectors
Idle Air Control Valve
The idle air control valve assembly controls engine idle speed and provides a dashpot function. The IAC valve assembly meters intake air around the
throttle plate through a bypass within the IAC valve assembly and throttle body. The PCM determines the desired idle speed or bypass air and signals the
IAC valve assembly through a specified duty cycle. The IAC valve responds by positioning the IAC valve to control the amount of bypassed air. The
PCM monitors engine rpm and increases or decreases the IAC duty cycle in order to achieve the desired rpm.