K 3500 Truck 4WD V8-454 7.4L VIN N TBI (1995)
Idle/Throttle Speed Control Unit: Adjustments
Idle Speed Control Actuator Adjustment
Procedure:
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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.
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Remove vacuum hose on ISC actuator on warm engine.
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Adjust ISC actuated idle speed to 1300 +/- 50 rpm. See image VIEW B.
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Install vacuum hose.
