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HOMESERVICE MANUALSCHEVROLET2001SUBURBAN C1500REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 11 (ENGINE CONTROLS - 6.5L (L65) (INTRODUCTION))REPAIR INSTRUCTIONSFUEL INJECTION PUMP TIMING ADJUSTMENT
2001 Chevrolet Suburban C1500

Fuel Injection Pump Timing Adjustment

2001 Chevrolet Suburban C1500SECTION Fuel Injection Pump Timing Adjustment
WARNING: This page is about a different car, the 2001 GMC C3500 HD and 2001 Chevrolet C3500 HD. However, it is still accessible from the selected car via links, so may be relevant.

Tools Required

This procedure should be used after an injection pump installation or when injection timing needs to be checked or adjusted. A scan tool must be used to check or adjust injection timing. A static timing mark can be used as a reference. If a static timing mark is not present on the injection pump mounting flange, one can be scribed to further assist in how far the injection pump needs to be rotated.

Injection Pump Timing Specification:  All injection pump timing averages 3.5 degrees.

IMPORTANT: There will be no change in engine performance or vehicle driveability if injection timing is advanced during the Time Set procedure. The injection timing must be set to Injection Timing Specifications. If the injection timing is not set correctly, a possible DTC P0216 may set (see DTC P0216, Conditions for setting the DTC).
  1. Start the engine.
  2. Run the engine to operating temperature.
  3. Install a scan tool.
  4. Use a scan tool to activate Time Set (if Time Set has been activated correctly, Des. Inj. Time on the scan tool will read 0.0 degrees).
    IMPORTANT: 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.
    IMPORTANT: If the engine stalls during Time Set activation, slightly (1 mm equals 2 degrees) rotate the injection pump toward the driver side of the vehicle, tighten flange nuts and repeat Time Set.
  6. If the injection timing needs to be adjusted, continue. If not, the adjustment is complete.
    7. IMPORTANT: Move the A/C compressor to the side to improve access to the injection pump lower mounting bolts.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.