Test Procedure
WARNING: This page is about a different car, the 2006 Mercury Mariner and 2006 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
- HG1 VISUAL INSPECTION OF THE PCV VALVE
- Check the PCV valve, hoses and connections for leaks or restrictions.
- Verify the proper PCV valve part number.
- Verify the PCV valve is clean.
- Verify the fresh air tube and related hoses are clean and routed correctly.
Are there any concerns found during the visual inspection?
Yes No REPAIR as necessary. GO to HG2. - HG2 STUCK PCV VALVE CHECK
- Disconnect the PCV valve from the valve cover.
- Shake the PCV valve.
Does the PCV valve rattle when shaken?
Yes No GO to HG3. INSTALL a new PCV valve. - HG3 PCV SYSTEM CHECK
- Install the PCV valve.
- Start the engine and warm it until engine temperature is stable.
- Disconnect the closure (fresh air) hose from the remote air cleaner or air outlet tube (the tube connecting the mass air flow sensor and the throttle body).
- Place a stiff piece of paper over the hose end. Wait 1 minute.
Does vacuum hold the paper in place?
Yes No The PCV system is OK. CHECK for vacuum leaks/obstruction in the PCV system (such as oil cap, PCV valve, hoses, cut grommets, valve cover bolt torque/gasket leak). The concern is elsewhere. RETURN to SYMPTOM CHARTS for further direction. REPAIR as necessary.