Idle Speed Control Unit - Revised
Number: 83-I-47Section: VIm
Date: March, 1983
Subject: REVISED IDLE SPEED CONTROL, ISC II, ON CERTAIN 1983 DUALJET CARBURETORS - 1983 3.8L V6 VIN CODE A AND VIN CODE 9
TO: ALL CHEVROLET DEALERS
Speed Control Assembly:
A revised idle speed control assembly was introduced on Dualjet carburetors for the 3.8L V6 engine (VIN Code 9), in December, 1982. Use has been extended to Dualjet carburetors used on the 3.8L V6 engine (VIN Code A). The new ISC assembly is identified by the numeral "II" on the motor housing, as shown.
The new feature is a silent throttle contact switch that does not "click" when actuated. When checking operation of the throttle contact switch on ISC II, follow present shop manual procedures.