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Home >> Ford >> 1989 >> Thunderbird LX >> Repair and Diagnosis >> Engine Performance >> System >> 3.8L CEC Tests W/Codes >> Quick Test >> Computed Timing Check
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Computed Timing Check

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