Note. Ignition timing is not adjustable on models with distributorless ignition systems.
5.0L
- 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.
- 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.
| 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. |
| (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. |
