Idle Speed (6.5L Diesel)

Idle speed is adjustable on 6.5L diesel (L57) only. L57 engine uses mechanical fuel injection. All others use electronic fuel injection in which PCM controls all fuel delivery modes based on inputs from AAP, ECT and BARO sensors. Adjust idle speed on L57 engine by turning low idle speed screw on injection pump to curb idle speed specification shown on emission control information label.