Ignition Timing: Adjustments
IGNITION TIMING ADJUSTMENT1. The vehicle should be prepared as follows before the inspection and adjustment.
- Engine coolant temperature: 85 - 95°C (185 - 205°F).
- Lights, electric, cooling fan, and accessories: OFF.
- Steering wheel: Neutral position.
- Transaxle: Neutral (N or P for A/T).
2. Insert a paper clip from wire side of the connector, and connect a tachometer to the paper clip.
NOTE: Do not use multi-use tester. It the multi-use tester is connected to the diagnosis connector, the ignition timing delivered is not standard ignition timing but ordinary timing.
Timing Connector:
CAUTION: The paper clip should be inserted as shown in the illustration.
3. Connect a timing light.
4. Start and run the engine at curb idle speed.
5. Check curb idle speed. Curb idle speed: 750 +/- 100 rpm.
NOTE: For rpm, one-half of the actual engine rpm is indicated, so the actual engine rpm in two times the indicated value shown by the tachometer.
6. Turn off the ignition switch.
Ignition Timing Adjustment Connector:
7. Connect a jumper wire to the terminal for ignition timing adjustment, and ground it.
NOTE: Basic ignition timing is obtained by grounding the ignition timing adjustment terminal.
8. Start and run the engine at curb idle speed.
9. Check basic ignition timing and adjust if necessary. Basic ignition timing: 5°BTDC +/- 2°.
10. It not within the standard value range, loosen the crank angle sensor mounting nut. Turning it counterclockwise retards timing, and clockwise advances it.
11. After adjustment, tighten the mounting nut while using care not to move the crank angle sensor.
12. Stop the engine.
13. Disconnect the lead wire connected at step 7.
14. Start and run the engine at curb idle speed.
15. Check to be sure that the idling ignition timing is the correct timing. ACTUAL IGNITION TIMING: Approx. 8°BTDC.
NOTE:
1. Ignition timing is variable within about +/- 7°, even under normal operating conditions.
2. And it is automatically further advanced by about 5° from 1O°BTDC. (8°BTDC at higher altitudes.)