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Test NTC-17A - Checking Minimum Idle Airflow

NOTE: Perform TEST NTC-15A before proceeding.
  1. Turn ignition off. Disconnect PCV valve hose from PCV valve. Plug PCV valve hose. Disconnect 3/16" idle purge hose from throttle. Install Orifice (6457) (orifice size is .125") to purge nipple at throttle. Go to next step.
  2. Start engine. Allow engine to reach normal operating temperature. Using scan tool, actuate minimum airflow. See MINIMUM IDLE AIRFLOW SPECIFICATIONS table. Go to next step.
    MINIMUM IDLE AIRFLOW SPECIFICATIONS

    Application RPM
    Less Than 1000 Miles 450-1100
    1000 Miles Or More 500-1100
  3. If throttle minimum airflow idle RPM is within specification, throttle is okay. Perform TEST VER-2A. If throttle minimum airflow idle RPM is not within specification, go to next step.
  4. Remove throttle. With throttle fully open on throttle, clean throttle with parts cleaner. Using soft brush or pad, ensure throttle bore and throttle plate are clean. Dry throttle with compressed air.
  5. Reinstall throttle. Recheck throttle minimum airflow. If throttle minimum airflow idle RPM is within specification, throttle is okay. Test is complete. Perform TEST VER-2A. If throttle minimum airflow idle RPM is not within specification, replace throttle. Perform TEST VER-2A.
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