Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET1983CAPRICE V6-229 3.8L VIN 9 2-BBLREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSIDLE/THROTTLE SPEED CONTROL UNITTECHNICAL SERVICE BULLETINSIDLE SPEED CONTROL UNIT - REVISED
1983 Chevrolet Caprice V6-229 3.8L VIN 9 2-bbl
Idle Speed Control Unit - Revised
1983 Chevrolet Caprice V6-229 3.8L VIN 9 2-bblSECTION Idle Speed Control Unit - Revised
Number: 83-I-47
Section: 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
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.
Section: 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.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.