Idle Speed: Testing and Inspection

Idle Speed Inspection

NOTE:
- Leave the idle air control (IAC) valve connected.
- Before checking the idle speed, check these items:
- The malfunction indicator lamp (MIL) has not been reported on.
- Ignition timing
- Spark plugs
- Air cleaner
- PCV system

1. Connect a tachometer or the HDS.
2. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) unit the radiator fan comes on, then let the engine idle.
3. Check the idle speed without load conditions: headlights, blower fan, radiator fan, and air conditioner not on.

Idle speed should be: 700 ± 50 rpm (in Park or neutral)

4. Idle the engine for 1 minute with the heater fan switch on HI and the air conditioner on, then check the idle speed.

Idle speed should be: 720 ± 50 rpm (in Park or neutral)

NOTE: If the idle speed is not within specification, see the symptom troubleshooting.