Idle Speed: Adjustments

CANADIAN VEHICLES: Pull the parking brake lever up. Start the engine, then check that the headlights are off.

1. Start the engine and warm it up to normal operating temperature (the cooling fan comes on). Turn ignition off.
2. Connect a tachometer.

Idle Air Control Valve:

3. Disconnect the two pin connector from the Idle Air Control (IAC) Valve.
4. Start engine and check idle speed in no-load condition (the headlights, blower fan, rear defogger, cooling fan, and air conditioner are not operating).
Idle speed should be: Manual/Automatic 550 ± 50 rpm

Idle Adjusting Screw:

5. Adjust the idle speed, if necessary, by turning the idle adjusting screw.
6. Turn the ignition switch OFF.

Under-dash Fuse / Relay Box Showing ECM Back-up Fuse:

7. Reconnect the two pin connector on the IAC, then remove the CLOCK/RADIO fuse in the under-hood relay box for 10 seconds to reset the PGM-FI ECM.
8. Restart and idle the engine with no-load conditions for one minute, then check the idle speed.

Idle speed should be: Manual/Automatic 700 ± 50 rpm


9. Idle the engine for one minute with headlights (high beams on) and rear defogger ON, check idle speed.

Idle speed should be: Manual/Automatic 790 ± 50 rpm