Idle Speed: Adjustments

IDLE SPEED

NOTE: Pull the parking brake lever up.

Idle Air Control (IAC) Valve:

1. Start the engine and let it warm up to normal operating temperature (the cooling fan comes on).
2. Connect a tachometer.
3. Disconnect the 2P connector from the IAC Valve.
4. Check the idle speed in the no load condition, with the headlights, blower fan, rear defogger, radiator fan, and air conditioning OFF. (Canada: Turn the ignition switch OFF. Then pull the parking brake lever up and start the engine).

Idle Speed Should Be:
Manual: 550 ± 50 rpm
Automatic: 550 ± 50 rpm ("N" or "P")

Idle Speed Adjusting Screw Location:

5. Adjust the idle speed, if necessary, by turning the adjusting screw on the throttle body.


6. Turn the ignition switch OFF, reconnect the 2P connector to the IAC Valve, remove the BACK UP fuse in the underhood relay box for 10 seconds to reset the ECM.
7. Restart the engine, set the steering in the straight forward position and check the idle speed in the no load conditions in which the headlights, blower fan, rear defroster, cooling fan, and air conditioner are not operating.

Idle speed should be:
Manual: 700 ± 50 rpm
Automatic: 700 ± 50 rpm ("N" or "P")

8. Idle the engine for one minute with headlights (Hi) and the rear window defogger ON and check the idle speed.

Idle speed should be:
Manual: 770 ± 50 rpm
Automatic: 770 ± 50 rpm ("N" or "P")

9. Idle the engine for one minute with heater fan switch at HI and air conditioner on, then check the idle speed.

Idle speed should be:
Manual: 770 ± 50 rpm
Automatic: 770 ± 50 rpm ("N" or "P")

NOTE: If the idle speed is not within specification, see COMPUTERS AND CONTROL SYSTEMS