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Home › Ford › 1988 › Bronco II 4WD, Standard, M5OD-R1 › Repair and Diagnosis › Engine Performance › System › EEC-IV CEC System › Quick Test › Timing Check

Timing Check

  1. Turn key off, wait 10 seconds. Start engine. Activate KEY ON ENGINE RUNNING (KOER) SELF-TEST  . After the last service code has been displayed, the timing will remain fixed for 2 minutes, unless SELF-TEST is deactivated.
  2. Correct SELF-TEST timing equals base ignition timing (10 degrees BTDC on all engines) plus 17-23 degrees BTDC. If timing is not 27-33 degrees BTDC, go to TEST D13  . If timing is 27-33 degrees BTDC, proceed with KEY ON ENGINE RUNNING (KOER) SELF-TEST.
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