Idle Speed/Throttle Actuator - Electronic: Adjustments

Fig. 3, Idle Speed Control Motor:

The idle speed control (ISC) motor Fig. 3 regulates the idle rpm on the engine as determined by the EEC-IV processor. The fast idle speed will continue to be controlled by the mechanical cam/screw arrangement. After start-up, the cam will rotate out of the way and the DC motor will control idle speeds from approximately the kickdown speed down to idle. The DC motor controls engine rpm's using instructions from the EEC-IV processor, making idle speed adjustments unnecessary.
In the fully retracted, engine-off mode, the throttle rests against a positive curb idle screw stop to prevent the throttle plate form sticking in the throttle bore.
On some carburetor applications, the maximum extension adjusting screw will have a jam nut positioned between the curve on the throttle lever and the face of the adjusting screw. It is important to tighten the jam nut to 25 in.lbs. against the curve of the throttle lever after getting the maximum extension of the screw.