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Spark Advance Of Computer

NOTE: The Spark Control Computer has various spark advance schedules incorporated into its microprocessor for operation at differing engine temperatures. Therefore, be sure engine is at normal operating temperature before testing.
  1. Start engine and allow it to warm to normal operating temperature. Place transmission in neutral and set parking brake.
  2. Place a thin insulator (piece of paper) between curb idle adjusting screw and carburetor switch, or make sure screw is not touching switch. See Figure. Remove and plug vacuum line at vacuum transducer.
  3. Connect an auxiliary vacuum supply to vacuum transducer and apply 10 in. Hg vacuum for 3.7L engines or 16 in. Hg vacuum for 5.2L engines. Increase engine speed to 2000 RPM, wait one minute for specified accumulator clock up time, and then check timing.
    CAUTION: Use a metal exhaust tube for this test, as high temperatures and extended test times could cause rubber hose to catch fire.
  4. If computer fails to obtain settings, replace computer.
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