Ignition Timing: Adjustments

Overall Inspection Sequence:

WARNING:
- Before selector lever is shifted to "D" position, apply parking brake and block both front and rear wheels with chocks.
- Depress brake pedal while racing the engine to prevent forward surge of vehicle.
- After the adjustment has been made, shift the lever to the "N" or "P" position and remove wheel chocks.

PREPARATION
1. Make sure that the following parts are in good order:
- Battery
- Ignition system
- Engine oil and coolant levels
- Fuses
- Engine Control Module (ECM) harness connector
- Vacuum hoses
- Air intake system (Oil filler cap, oil level gauge, etc.)
- Fuel pressure
- Engine compression
- Exhaust Gas Recirculation (EGR) valve operation
- Throttle valve

2. On air conditioning equipped models, checks should be carried out while the air conditioning is "OFF".
3. When checking idle rpm, ignition timing and mixture ratio, checks should be carried out while shift level is in "N" position.
4. When measuring "CO" percentage, insert probe more than 40 cm (15.7 in) into tail pipe.
5. Turn off headlamps, heater blower, rear defogger.
6. Keep front wheels pointed straight ahead.
7. Make the check after the cooling fan has stopped.


SPECIFIC INSPECTION PROCEDURES

Idle Speed/Ignition Timing/Mixture Ratio Inspection:

CHART 1 of 4

Idle Speed/Ignition Timing/Mixture Ratio Inspection:

CHART 2 of 4

Idle Speed/Ignition Timing/Mixture Ratio Inspection:

CHART 3 of 4

Idle Speed/Ignition Timing/Mixture Ratio Inspection:

CHART 4 of 4