Mirage L4-1597cc 1.6L DOHC (1990)
Idle Speed: Adjustments
Idle Speed Adjustment
Fig. 47 Connecting Tachometer To Engine Speed Terminal
1. Confirm initial inspection conditions:
a. Engine coolant temperature is 185 - 205°F.
b. Lights, cooling fan and all accessories are OFF.
c. Transaxle is in neutral or park.
d. Steering wheel is in straight-ahead position, (on vehicles with power steering).
2. Check the ignition timing and adjust, if necessary. (Refer to procedure)
3. Connect a tachometer to the engine speed detection terminal. Fig. 47
4. Maintain engine speed at 2,000 - 3,000 RPM for 5 - 10 seconds.
5. Allow engine to idle for 2 minutes.
6. Check the engine idle speed. If it is NOT within specifications, check the idle speed control system.
Curb Idle Speed:
750 ± 100 RPM
7. Stop engine and disconnect tachometer. (Leave tachometer connected, if further adjustments are required).
Fig. 48 Ignition Timing Adjustment Connector
IDLE SPEED CONTROL (ISC) SYSTEM
1. Connect a tachometer to the engine speed detection terminal.
2. Remove the waterproof plug from the connector for ignition timing adjustment and ground the terminal using a jumper wire. Fig. 48
3. Connect terminal 10 of the self-diagnosis connector, (located under the LH side of instrument panel), to ground with a jumper wire.
4. Start the engine and let it run at idle.
5. Compare the engine speed to the basic idle speed specification.
Basic Idle Speed:
750 ± 50 RPM