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Home >> Ford >> 1991 >> Bronco 4.9 Y, Standard, M5OD-R2 >> Repair and Diagnosis >> Engine Performance >> Engine Controls - Adjustments >> Adjustments >> Ignition Timing >> Initial Timing (TFI-IV)
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Initial Timing (TFI-IV)

  1. Place transmission in Park or Neutral. Ensure A/C and heater are off. Connect inductive timing light and tachometer to engine. With engine off, disconnect the single-wire in-line spout (Yellow/Light Green wire near distributor) connector or remove shorting bar from the double-wire spout connector. Start and warm engine to normal operating temperature.
  2. With engine at idle speed, check/adjust initial timing to 10 degrees BTDC. Turn engine off and reconnect the single-wire in-line spout connector or reinstall shorting bar on double-wire spout connector. Start engine and check timing advance to verify distributor is advancing beyond initial setting. Remove test equipment and reconnect all disconnected components.
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