Idle Speed: Adjustments

CURB IDLE SPEED INSPECTION

Before checking the CURB idle speed, be sure:

Engine coolant temperature has reached 85-95°C (185 - 205°F)
Engine cooling fan, lights and electrical accessories are OFF
Transaxle is in Neutral (N) or Park (P)
Steering wheel is at a center position (power steering equipped vehicles)
Parking brake is applied.

Verify that the ignition timing is set to specifications. Refer to ELECTRICAL SPECIFICATIONS

Ignition Timing Adjustment:

CAUTION: Improper setting of the throttle valve opening will increase exhaust gas temperatures at deceleration, which will greatly reduce the life of the Catalytic Converter. Also, fuel consumption and engine braking will be affected.

1. Connect a tachometer to the engine speed detection terminal.
2. Start and run the engine for more than 5 seconds at 2,000 to 3,000 rpm.
3. Reduce the rpm and let the engine idle for 2 minutes.
4. Read the CURB idle speed. Refer to MECHANICAL SPECIFICATIONS.

Adjustment of the idle speed is usually unnecessary.
Idle speed on fuel injected vehicles is controlled by the MPI Control Unit through the Idle Speed Control System. For testing and adjustment procedures of this system and its components, refer to COMPUTERIZED ENGINE CONTROLS.