C 2500 Truck 2WD V6-262 4.3L VIN Z (1992)
Idle Speed/Throttle Actuator - Electronic: Description and Operation
Idle Air Control (IAC) System
Idle Air Control Valve
IAC System
PURPOSE
To control engine idle speed and prevent stalling due to changes in engine load.
OPERATION
All engine idle speeds are controlled by the control module through the Idle Air Control (IAC) valve mounted on the throttle body. The control
module sends voltage pulses to the IAC motor windings causing the IAC motor shaft and pintle to move "IN" or "OUT" a given distance (number
