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Ignition Timing: 5.0L

  1. Turn all accessories off. Set parking brake, and block wheels. Connect timing light to engine. Disconnect single in-line Spark Output (SPOUT) connector (Yellow/Light Green wire) near Ignition Control Module (ICM) at distributor.
  2. Start engine and warm to normal operating temperature. Place transmission in Park (A/T) or Neutral (M/T). With engine at idle RPM, check ignition timing. See BASE IGNITION TIMING table for specification. Turn engine off. Reconnect in-line SPOUT connector. Check computed ignition timing. Computed ignition timing should be advanced beyond base timing.
BASE IGNITION TIMING

Application Degrees BTDC @ Idle
4.6L (1) & 5.0L (2) 10
(1) On 4.6L, ignition timing is not adjustable.
(2) Disconnect single in-line SPOUT connector or remove shorting bar from double-wire SPOUT connector.
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