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Home >> Dodge and Ram >> 2001 >> Durango 5.9 Z, 4WD, Part Time >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System & Component Testing >> Emission Systems & Sub-Systems >> Positive Crankcase Ventilation
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Positive Crankcase Ventilation

NOTE: On 2.5L, manufacturer indicates engine may be equipped with a Closed Crankcase Ventilation (CCV) system or a Positive Crankcase Ventilation (PCV) system. If engine is equipped with a CCV system, it will not have a PCV valve. For more information on PCV system and CCV system, see EMISSION SYSTEMS & SUB-SYSTEMS in THEORY & OPERATION article. If engine is equipped with a CCV system, see CLOSED CRANKCASE VENTILATION SYSTEM .
  1. Disconnect hose from Positive Crankcase Ventilation (PCV) valve. PCV valve is located on engine oil filler tube. Rotate PCV valve downward until locating tabs on PCV valve align with slots on filler tube. Nipple on PCV valve should now be pointing downward. Remove PCV valve. 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 valve is functioning properly, a hissing sound will be heard as air passes through valve. Place finger over PCV valve inlet. A strong vacuum should be felt at valve inlet. If vacuum is not felt, turn ignition off and go to next step. If vacuum is felt, turn ignition off and go to step  4.
  3. Disconnect hose from PCV valve. Remove and shake PCV valve to ensure a metallic clicking noise can be heard, indicating valve is free. If valve is not free, do not attempt to clean PCV valve. Replace valve. If PCV valve is free, check for obstructions or kinks in PCV valve hose. If hose is okay, check for plugged vacuum fitting at rear of intake manifold. Repair vacuum fitting as necessary and go to next step.
  4. Reinstall PCV valve. Disconnect fresh air hose from air cleaner resonator on top of engine. See Fig 1. Start engine and allow it to idle. Hold a piece of stiff paper over fresh air hose opening. After allowing about one minute for crankcase pressure stabilization, 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.
Fig 1: Identifying PCV Breathers, Hoses & Tubes
G00010245Courtesy of DAIMLERCHRYSLER CORPORATION
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