Injection Timing - Dynamic Timing

Ensure idle speed and injection timing are set to specification. See the DYNAMIC INJECTION TIMING table. For adjustment procedures, refer to the ADJUSTMENTS - DIESEL article in this section. Ensure all accessories are off and transmission is in Park or Neutral. Set parking brake. Ensure vehicle front wheels are in straight-ahead position and idle speed is correct.

NOTE: Always refer to Emission Control Label in engine compartment before attempting service. If manual and label differ, always use emission label specifications.

DYNAMIC INJECTION TIMING SPECIFICATIONS ⁽¹⁾

Fuel Cetane

Calibration 4-68J ROO

Calibration 4-68X ROO

38-42

3.8° ATDC

4.5° ATDC

43-46

2.5° ATDC

3.5° ATDC

47 or Greater

1.5° ATDC

2.5° ATDC

⁽¹⁾	Tolerance is +/- 1°. Service limit is +/- 2°.