### Idle Speed

#### ADJUSTMENT

NOTE: The engine should be in good mechanical condition and all electrical connectors and vacuum hoses connected before making this adjustment.

1. Start the engine and let it warm up to normal operating temperature.
2. Check the ignition timing and adjust if needed.
3. Run the engine under no load at 2,000 rpm for about two minutes. Rev the engine two or three times and let it idle for one minute.
4. Check the idle speed and compare to the specifications:
5. If adjustment is required, disconnect the throttle position sensor connector for Non-turbo or disconnect the idle air control valve for turbocharged vehicles.
6. Run the engine under no load at 2,000 rpm for about two minutes. Rev the engine two or three times and let it idle.
7. Adjust the idle speed using the idle speed adjusting screw to the specifications earlier.
8. Connect the throttle position sensor for Non-turbo or connect the idle air control valve for turbocharged vehicles.
9. Run the engine under no load at 2,000 rpm for about two minutes. Rev the engine two or three times and let it idle.
10. Check the idle speed for the proper specification. If not, check the IACV-AAC (idle air control valve) valve or related wiring.
11. If the idle speed is still not correct, substitute a known good ECM.

    NOTE: The ECM may be the cause of the problem, however this is rarely the case.

    Fig. 1: Idle speed adjusting screw — 2.0L (SR20DE) engines