Ignition Timing: Adjustments

1. Pre-condition the engine as follows:
a. Engine coolant temperature is at operating temperature, 85-95°C (185-205°F).
b. Lights, electrical accessories, and cooling fan are OFF.
c. Transaxle is in NEUTRAL.
d. Front wheels are in a straight-ahead position.


2. Connect a timing light to the number one cylinder according to manufacturers instructions.

Ignition Timing Adjustment:

3. Insert a paper clip into the back side of the engine tachometer terminal and connect a tachometer to the paper clip.

CAUTION:
^ The connector should not be disconnected.
^ The paper clip should be inserted along the terminal surface at the correct side. If it is inserted incorrectly, the paper clip may become caught and cannot be removed without damaging the connector.
For a male pin: insert to the lock tab side.
For a female pin: insert to the side opposite the lock tab.

4. START and run the engine at idle. Verify that Curb Idle Speed is 700 rpm ± 100 rpm.

Ignition Timing Adjustment:

5. STOP the engine, and disconnect the ignition timing adjustment terminal. Using a lead wire with alligator clips, ground the terminal.
6. START and run the engine at idle.

Timing Mark:

7. Verify that Basic Ignition Timing is 5 ° ± 2 ° BTDC.

Basic Ignition Timing Adjustment:

8. If timing is not within specification, loosen the distributor flange mounting nut and adjust by turning the distributor.
9. After adjustment tighten the nut, being careful that the distributor does not move.
10. STOP the engine. Disconnect the lead wire and remove the paper clip.
11. START and run the engine at idle. Recheck ignition timing to ensure that it advances from basic to 15° BTDC, actual timing.
NOTE:
^ Actual ignition timing may vary, depending on the control mode of the Engine Control Unit.
^ At altitudes more than 700m (2300 ft) above sea level, the ECU may further advance the actual ignition timing.