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Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis >> External Pages >> Different car >> Section 29 (Engine Controls - Tests W/Codes - 3.3L Gasoline) >> Self-Diagnostic Tests >> Test NTC-15A - Checking Minimum Idle Airflow

Test NTC-15A - Checking Minimum Idle Airflow

WARNING: This page is about a different car, the 1995 Plymouth Voyager, 1995 Plymouth Grand Voyager, 1995 Dodge Grand Caravan, and 1995 Dodge Caravan. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn ignition off. Disconnect PCV valve hose from vacuum nipple. Install Vacuum Fitting (6457) to intake manifold PCV nipple. Disconnect 3/16" hose from throttle body. Cap 3/16" hose nipple on throttle body. Start engine. Allow engine to reach normal operating temperature.
  2. Using scan tool, actuate minimum airflow. If vehicle has more than 1000 miles on odometer, go to next step. If vehicle has less than 1000 miles on odometer and engine speed is not 650-950 RPM, replace throttle body. Perform TEST VER-2. If vehicle has less than 1000 miles and engine speed is 650-950 RPM, minimum airflow is normal. Test is complete.
  3. Engine speed should be 700-950 RPM. If engine speed is as specified, minimum airflow is normal. Test is complete. If engine speed is not 700-950 RPM, replace throttle body. Perform TEST VER-2.
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