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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 431 (Engine Mechanical - 6.5L (On-Vehicle)) >> Adjustments & Inspections >> Fuel Injection Pump Timing Adjustments >> Timing Set Procedure

Timing Set Procedure

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2002 GMC Savana Special, 2002 GMC Savana Camper Special, 2002 GMC Savana, 2002 Chevrolet RV Cutaway, and 2002 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
  1. Start the engine.
  2. Allow the engine to idle at the normal operating temperature.
  3. Install the scan tool.
  4. Use the scan tool in order to activate the TIME SET, if the TIME SET has been activated correctly, DESIRED INJECTION TIME on the scan tool will read 0.0 degree.
    5. NOTE: The actual injection TIME VALUE on the scan tool will fluctuate. The Average reading should be 3.5 degrees.
  5. The actual injection time, scan tool display, should be approximately 3.5 degrees. If not, continue to step  6.
    6. NOTE: If the engine stalls during the Time Set activation, slightly rotate the injection pump toward the driver side of the vehicle, tighten the flange nuts and repeat the Time Set (1 mm equals 2 degrees).
  6. If the injection timing needs to be adjusted, continue. If not, this indicates that the adjustment is complete.
  7. With the engine OFF, use the Injection Pump Wrench in order to loosen the left hand injection pump flange nut.
  8. With the engine OFF, use the Injection Pump Wrench in order to loosen the right hand injection pump flange nut.
  9. With the engine OFF, use the Injection Pump Wrench in order to loosen the center top injection pump flange nut.
  10. Use the Injection Pump Adjustment Tool in order to slightly rotate the injection pump.
  11. Set the actual injection time to 3.5 degrees.
    12. NOTE: It is normal for actual injection TIME VALUE on the scan tool to fluctuate. The average fluctuation of the actual injection TIME should be 3.5 degrees.
  12. Continue to repeat until the average fluctuation of the actual injection time is 3.5 degrees.
    • If the actual injection time is above 3.5 degrees, slightly rotate the injection pump towards the passenger side of the vehicle (1 mm equals 2 degrees).
    • If the actual Injection time is below 3.5 degrees, slightly rotate the injection pump toward the driver side of the vehicle (1 mm equals 2 degrees).
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