C 30 P/U 2WD V8-379 6.2L DSL (1985)
Idle Speed: Adjustments
Idle Speed
Idle Speed Setting Procedure
1. All idle speeds are to be set within 25 RPM of specified valve.
2. Set parking brake and block drive wheels.
3. Engine must be at normal operating temperature. Air cleaner should be on and all accessories should be turned off.
4. Install, tool J-26925, diesel tachometer or equivalent per manufacturers instruction.
5. Adjust low idle speed screw on fuel injection pump to an engine speed of 650 RPM in neutral or park for automatic transmission and for manual
transmissions.
6. Adjust fast idle speed as follows:
a. Remove connector from fast idle solenoid. Use an insulated jumper wire from battery positive terminal to solenoid terminal to energize
solenoid.
b. Open throttle momentarily to ensure that the fast idle solenoid plunger is energized and fully extended.
c. Adjust the extended plunger by turning the hex head to an engine fast idle speed of 800 RPM in neutral.
d. Remove jumper wire and reinstall connector to fast idle solenoid.
7. Remove tachometer.
