Ignition Timing: Adjustments

Idle Speed/Ignition Timing/Idle Mixture Ratio Adjustment

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

2. On models equipped with air conditioner, checks should be carried out while the air conditioner is "OFF".
3. On models equipped with automatic transmission, when checking idle speed, ignition timing and mixture ratio, checks should be carried out while shift lever is in P or N position.
4. When measuring CO percentage, insert probe more than 40 cm (15.7 in) into tail pipe.
5. Turn switch OFF headlamp and heater blower.
6. Keep front wheels pointed straight ahead.