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Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis >> External Pages >> Different car >> Section 43 (Engine Controls - Tests W/Codes - 8.0L) >> Self-Diagnostic Tests >> Test NTC-17A - Checking Minimum Idle Airflow

Test NTC-17A - Checking Minimum Idle Airflow

WARNING: This page is about a different car, the 1995 Dodge Pickup and 1995 Dodge Cab & Chassis. 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 EGR and EVAP solenoid vacuum supply hose from intake manifold. Cap 3/16" hose nipple on intake manifold. Start engine. Allow engine to reach normal operating temperature. Go to next step.
  2. Using scan tool, actuate minimum idle airflow. Wait for system to stabilize. If engine speed is 400-800 RPM, minimum airflow is okay. Stop actuation test. Test is complete.
  3. If engine speed is not 400-800 RPM, stop actuation test. Turn engine off. Using an approved cleaner, clean throttle body. Start engine. Using scan tool, actuate minimum airflow. If engine speed is 400-800 RPM, repair is complete. Perform TEST VER-2. If vehicle speed is not 400-800 RPM, replace throttle body. Perform TEST VER-2.
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