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Home >> Chevrolet >> 2004 >> Tracker RWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - 2.5L (LE8) (Introduction) >> Repair Instructions >> Ignition System Timing Adjustment Procedure
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Ignition System Timing Adjustment Procedure

  1. Install a scan tool.
  2. Remove the two fasteners and the ignition coil cover (2) from the bank 1 valve cover (1).
    3. Fig 1: View Of Ignition Coil Cover Fasteners & Valve Cover
    GM739064Courtesy of GENERAL MOTORS CORP.
  3. Connect an inductive timing light to the number 1 ignition coil wiring harness.
  4. Start the engine.
  5. Allow the engine to reach normal operating temperature.
  6. Perform the following checks:
    • The A/C is OFF.
    • The gearshift control lever is set in Park.
    • The parking brake lever is fully engaged.
  7. Select the Engine Output Controls feature under Special Functions of the scan tool Diagnostic menu.
  8. TURN ON the Fixed Spark mode with the scan tool.
  9. Observe that the Spark parameter on the scan tool data list displays 5 degrees, indicating that the Fixed Spark mode has been activated.
  10. Inspect with the timing light that the crankshaft pulley notch lines up with the timing pointer, indicating that the timing is correctly set at 5 degrees.
    11. Fig 2: View Of Number 1 Ignition Coil Wiring Harness
    GM677353Courtesy of GENERAL MOTORS CORP.
  11. If the timing marks are not correctly aligned, adjust the ignition timing as follows:
    1. Loosen the camshaft position (CMP) sensor housing bolts (2).
      • Rotate the CMP sensor housing (1) clockwise in order to advance the timing.
      • Rotate the CMP sensor housing (1) counterclockwise in order to retard the ignition timing.
    2. Tighten the CMP sensor housing bolts (2).
    3. Review the ignition timing with the timing light as in step 9.
  12. Repeat step 11 if the timing marks are not correctly aligned.
    13. NOTE: Refer to Fastener Notice in Cautions and Notices.
  13. Tighten the CMP sensor housing bolts (2) to the correct value.

    Tighten:  Tighten the CMP sensor housing bolt to 15 N.m (11 lb ft).

    14. Fig 3: View Of CMP Sensor Housing & Bolts
    GM677351Courtesy of GENERAL MOTORS CORP.
  14. Inspect with the timing light that the crankshaft pulley mark and the timing pointer are still correctly aligned.
  15. TURN OFF the Fixed Spark mode with the scan tool.
  16. Observe the timing marks with the timing light.
  17. The crankshaft pulley mark should now be approximately 10-13 mm (0.4-0.5 in) to the left of the timing pointer, indicating normal operation.
    18. Fig 4: View Of Number 1 Ignition Coil Wiring Harness
    GM677353Courtesy of GENERAL MOTORS CORP.
  18. Install the ignition coil cover (2) to the bank 1 valve cover (1).
  19. Secure the ignition coil cover (2) with the two fasteners.

    Tighten:  Tighten the two fasteners to 3 N.m (26 lb in).

    20. Fig 5: View Of Ignition Coil Cover Fasteners & Valve Cover
    GM739064Courtesy of GENERAL MOTORS CORP.
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