Ignition Timing
NOTE:
Some engines are equipped with a receptacle for a magnetic probe timing light, located 9.5° ATDC. Do not use this location for timing with a conventional light.
Ignition timing procedures will vary with vehicle model and component application. Refer to Emissions Control Decal in engine compartment for correct adjustment procedures and proceed as follows:
To check ignition timing, connect a timing light to engine and disconnect 4-wire EST connector at distributor. With engine running at normal operating temperature, note engine timing.
Ignition Timing (Degrees BTDC @ Idle)
| Application | Man. Trans. | Auto. Trans. | ||||
|---|---|---|---|---|---|---|
| 4.1L (250") | 10 | |||||
| 4.3L (2.60") | (1)20 | |||||
| 4.4L(267") | 2 | |||||
| 5.0L (305") 4-Bbl. | 6 | 6 | ||||
| 5.0L (305") EFI | (2) | (2) | ||||
| 5.0L (307") | (1)20 | |||||
| 5.7L (350") | 6 | |||||
| 6.0L (368") | 10 | |||||
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