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Minimum Airflow Tests: 3.0L

  1. Ensure engine is at operating temperature. Connect timing check device and tachometer. Disconnect engine coolant temperature sensor.
  2. Set basic timing to 10-14° BTDC. Shut off engine. Reconnect engine coolant temperature sensor. Disconnect PCV hose from PCV valve.
  3. Plug PCV valve nipple. Disconnect idle purge hose at tee fitting. Attach Orifice (6457) to intake purge hose. Orifice size is .125" (3 mm).
  4. Connect Diagnostic Readout Box II (DRB-II). Start engine. Let engine idle for at least one minute.
  5. Using DRB-II, access MINIMUM AIRFLOW IDLE SPEED mode. When this mode is accessed, AIS motor will fully close, spark advance will be fixed and engine RPM will be displayed on DRB-II.
  6. Check idle RPM with tachometer. See MINIMUM AIRFLOW IDLE SPEED  table. If minimum airflow idle speed is not to specification, replace throttle body. Disconnect all test equipment.
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