S10/T10 P/U 4WD V6-173 2.8L VIN B 2-bbl (1983)
Idle Speed Control Motor: Description and Operation
Idle Speed Control (ISC)
The ISC assembly controls engine idle speed according to ECM programming.
When the throttle lever rests against the ISC plunger, the ISC acts as a dashpot on throttle closing per second.
