NOTE: Basic timing readings are only valid when engine idle speed and idle mixture are within specifications. For best results, manufacturer recommends ignition timing, idle CO and idle speed be checked and adjusted in that order.

Check timing advance only after determining that the basic ignition timing is adjusted to specification. With the engine running at normal operating temperature, briefly raise engine speed to above 3000 rpm, repeating this step 4 times. Then let the engine idle for at least 2 minutes.

Disconnect the coolant temperature sensor connector. Raise the engine speed to 2300 rpm, and record timing value. Reconnect coolant temperature sensor connector and briefly raise engine speed above 3000 rpm to store knock sensor information in memory. Raise engine speed to 2300 rpm and recheck timing. It should now be 30°+/-3° more advance than it was with coolant temperature sensor connected.

If timing does not advance as specified, first check knock sensor mounting bolt torque, then check knock sensor resistance and wiring. If torque and resistance are within specification and there are no breaks in wiring, then Digifant control unit is probably fault.

If connecting or disconnecting coolant temperature sensor has no effect on timing advance, check continuity of coolant temperature sensor wire. If there are no breaks in wire, then either Digifant control unit or temperature sensor is faulty.

Engine oil temperature must be 176° F (80° C). Connect timing light and tachometer. Start engine and allow to idle. Check ignition timing at 800-1000 RPM.

NOTE: Before checking engine timing, raise engine speed above 2100 RPM at least 4 times. This must be done each time ignition is turned off and restarted to clear ECU memory and by-pass hot-start, fast-idle function.

If an adjustment is needed, turn ignition off and loosen distributor hold-down bolt just enough to move distributor by hand. Remove connectors from idle stabilizer by squeezing connectors then pulling apart. Plug idle stabilizer connectors together.

Start and allow engine to idle. Turn distributor until notch on V-belt pulley matches separation in case. Set timing and RPM. Reconnect electrical connectors to idle stabilizer. Tighten distributor clamp bolt.

IGNITION TIMING TABLE (Degrees BTDC @ RPM)
Application	Checking	Adjusting
2.1 Liter	4-8 @ 800-900	5-7 @ 800-900