K 3500 Truck 4WD V8-454 7.4L (1994)
Idle Speed Control Motor: Adjustments
Idle Speed Control Actuator Adjustment
Procedure:
-
Before adjusting ISC actuator you must first check the minimum idle speed to be within specifications. Refer to SPECIFICATIONS/IDLE
SPEED. (ISC actuator must have vacuum applied so that it is not contacting the throttle lever.) See image VIEW A.
-
Remove vacuum hose on ISC actuator on warm engine.
-
Adjust ISC actuated idle speed to 1300 +/- 50 RPM. See image VIEW B.
-
Install vacuum hose.
