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PCV System

NOTE: For component location, see COMPONENT LOCATIONS  . For connector identification, see CONNECTOR IDENTIFICATION  . For circuit identification and wiring diagram, see WIRING DIAGRAMS article. After each repair procedure has been completed, reconnect all components.
  1. Turn the ignition off. Ensure throttle plate and linkage are not binding. Repair throttle plate and linkage as necessary before continuing. If throttle plate and linkage are okay, go to next step.
  2. Start engine and allow it to idle. Check engine, Brake Booster and vacuum hoses for leaks. Ensure PCV system is functioning properly. Repair vacuum leaks as necessary. If PCV system is okay and no vacuum leaks exist, go to next step.
  3. Turn the ignition off. Disconnect vacuum hose from PCV Valve. Install PCV Adapter (6714) into disconnected vacuum hose in place of PCV Valve. PCV adapter is a .185" (4.70 mm) air metering orifice. Disconnect purge hose from Throttle Body fitting and cap the fitting. Purge hose is located on front of Throttle Body next to Manifold Absolute Pressure (MAP) Sensor. Start engine and allow it to idle. Ensure all accessories are off. Allow engine to reach normal operating temperature. Using DRB-III(R), actuate the MINIMUM AIR FLOW TEST. If engine speed is 500-900 RPM, no problem is indicated at this time. Test is complete. If engine speed is not 500-900 RPM, go to next step.
  4. Turn the ignition off. Remove Throttle Body. While holding throttle open, spray entire Throttle Body bore with appropriate cleaner. Using a soft scuff pad, clean Throttle Body bore and throttle plate. Using compressed air, dry Throttle Body. Install Throttle Body. Ensure PCV adapter is still installed and Throttle Body fitting is capped. Start engine and allow it to idle. Ensure engine is at normal operating temperature. Using DRB-III(R), perform MINIMUM AIR FLOW TEST. If engine speed is not 500-900 RPM, replace Throttle Body. If engine speed is 500-900 RPM, no problem is indicated at this time. Test is complete.
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