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 V8 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 @ RPM |
|---|---|
| 4.6L & 5.0L | (1) 10 @ 575-725 |
| (1) On 4.6L engine, ignition timing is not adjustable. | |
| (1) | On 4.6L engine, ignition timing is not adjustable. |
BASE IGNITION TIMING