GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Geo 🢒 1997 🢒 Tracker - 2WD 🢒 Engine 🢒 Engine Controls - 1.6L 🢒 Ignition Timing Adjustment
  1. Start the engine.
  2. Allow the engine to reach normal operating temperature.
  3. Perform the following checks:
    4. • The A/C is OFF (If equipped).
    • The gearshift control lever is set in Neutral (manual transmission) or the manual selector lever is in Park (automatic transmission).
    • The parking brake lever is fully engaged.

    Object Number: 159225 Size: SH
  4. Remove the cap from the Duty Check Data Link Connector which is located next to the battery.
  5. Connect a jumper wire from the Duty Check Data Link Connector cavity 4 to cavity 5 in order to fix the ignition timing at base.

    6. Object Number: 55673 Size: SH
  6. Connect an inductive timing light (1) to the high tension ignition wire of the No. 1 cylinder.
  7. Check the ignition timing. The correct ignition timing is 5 degrees BTDC (4-6 degrees) at 800 RPM. Refer to Vehicle Emission Control Information Label.

    8. Object Number: 55674 Size: SH
  8. Adjust the ignition timing if the timimg is not within vehicle specification.
  9. Loosen the distributor hold down bolt (1) and rotate the distributor.
  10. Repeat steps 8 and 9 until the ignition timing is within specifications.
  11. Remove the jumper wire from the Duty Check Data Link Connector and make sure that the timing advances according to engine speed.