K 2500 Truck 4WD V8-379 6.2L DSL VIN C FI (1989)
Idle Speed: Adjustments
Fast Idle Speed
Fig. 4 Curb & fast idle speed adjustment. V8-379 engine
CV8-379 ENGINE
1. Apply parking brake, then block drive wheels.
2. Start engine and allow to reach normal operating temperature, then shut engine off.
3. Connect diesel tachometer J-26925 or equivalent, following tool manufacturer's instructions.
4. With air cleaner installed, start engine, then place transmission in Neutral on manual transmission models, in Drive on automatic transmission
models.
5. Remove connector from fast idle solenoid and connect a suitable jumper wire between battery positive terminal and solenoid, Fig. 4.
6. Open throttle to ensure solenoid plunger is fully extended, then turn solenoid hex screw as necessary to set fast idle speed to specifications.
7. Remove jumper wire and reconnect solenoid electrical connector.
