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PCV System (4.7L)

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. Disconnect hose from PCV Valve on engine oil filler tube. Rotate PCV Valve downward (counter-clockwise) until locating tabs on PCV Valve align with slots on filler tube. Nipple on PCV Valve should now be pointing downward. Remove PCV Valve by pulling straight out from filler tube. Check condition of PCV Valve "O" ring and replace as necessary.
  2. Reconnect hose to PCV Valve. Start engine and allow it to idle. If PCV Valve is functioning properly, a hissing sound will be heard as air passes through PCV Valve. Place a finger over PCV Valve inlet. A strong vacuum should be felt at PCV Valve inlet. If vacuum is not felt, turn the ignition off and go to next step. If vacuum is felt, turn the ignition off and go to step  4 .
    3. CAUTION: DO NOT attempt to clean old PCV Valve. If it is necessary to clean the Intake Manifold vacuum fitting, use a 1/4" or smaller drill bit turned by hand to avoid removing any metal from the fitting, then blow out using shop air.
  3. Disconnect hose from PCV Valve. Check for obstructions or kinks in PCV Valve hose. If hose is okay, check for plugged vacuum fitting at rear of Intake Manifold. Clean or Replace as necessary. If no obstructions are found, replace PCV Valve.
  4. Reinstall PCV Valve. Turn PCV Valve upward until a slight click is felt when tabs have engaged cam lock. Reconnect hose to PCV Valve. Disconnect rubber hose from air fitting at left side of Air Cleaner Resonator on top of engine. Start engine and allow it to idle. Hold a piece of stiff paper loosely over opening of disconnected rubber hose. After allowing about one minute for crankcase pressure to reduce, paper should be drawn against opening. If paper is held against opening, system is functioning properly. If paper is not held against opening, check hoses/tubes and crankcase breathers for restrictions. Repair PCV system as necessary.
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