Ignition Timing

NOTE: Timing instrument should be connected to number one spark plug wire using a suitable adapter or snap-on connector. Do not puncture spark plug wire or boot to make connection.

Clean front damper surface and make white mark on proper degree line of damper and pointer. Turn A/C off and de-energize throttle solenoid positioner (if equipped). Disconnect and plug vacuum lines from distributor.
If equipped with dual mode timing ignition module, disconnect the 3-pin switch assembly from ignition module.
On all models, connect timing light to No. 1 spark plug and a tachometer to engine.
NOTE: Magnetic probe timing device may be used if instrument is available and engine is so equipped. Timing probe offset is 52 1/2 ° ATDC on 2300 cc engine.

NOTE: On Dura Spark II ignition systems, use only a clamp-on type inductive pickup timing light and tachometer rated for this system.
With engine at normal operating temperature, adjust ignition timing idle speed to specification. Check initial timing. If within ±2° of specification, do not adjust.
If more than ±2°, loosen distributor hold down bolt. Adjust ignition timing to specifications by rotating distributor to align marks on damper and pointer. Tighten hold down bolt and recheck timing.

For vehicles with dual mode ignition timing module, reconnect the 3-pin switch assembly connector to module and check its function as follows: Disconnect and plug vacuum line to switch. Using a vacuum pump, apply a minimum of 12 in. Hg vacuum to switch, timing should be to specifications. Apply zero vacuum to switch, timing should be 3-6° less than specifications. If not, replace unit.

Ignition Timing Specifications (Degrees BTDC@RPM)

Application

Man. Trans.

Auto. Trans.

2300 cc

Federal

6@550

⁽¹⁾6@600

Calif.

6@650

12@600

Turbo

Federal

6@550

10@600

Calif.

2@600

10@600

⁽¹⁾	(1) - Calibration No.'s 0-21A-R0, 0-21B-R0, 0-21B-R10; Timing is 17@650. Calibration No. 9-21 B-R10; Timing is 20@600.