How to replace the PCV Valve in a 4.6L or 5.4L V-8

The Positive Crankcase Ventilation mechanism vents petrol fumes indigenous the crankcase v the entry of the engine wherein they are disposed of through burning in the cylinder. Gas fumes in the crankcase room a organic product that blow-by, which occurs to some level in also a brand brand-new engine because a perfect seal between a piston ring and cylinder is difficult to achieve. Engines provided to vent this gas fumes into the environment through a tiny filter mounted on the valve cover(s). However, contemporary emission standards need these fumes be disposed of in a much more environmentally trusted manner, and also thus the PCV mechanism is used.


Applicable design Years: 1997 - 2010 Ford F-150, 4.6L and also 5.4L V-8 1997 - 2001 PCV valve: Motorcraft EV233 (Ford F7UZ-6A666-CA) 2002 - 2004 PCV valve: Motorcraft EV258 (Ford 2L3E-6A666-AA) 2005 PCV valve: Motorcraft EV259 (Ford 4L2E-6A666-BA) 2006 - 2010 PCV valve: Motorcraft EV279 (Ford 6W72-6A666-AA) keep in mind - there may be some crossover years w/ for to component numbers; always verify fitment.


The PCV valve is essentially a inspect valve that ensures the flow of crankcase fumes just occurs native the crankcase come the entry manifold, and not the entry manifold to the crankcase. End time, the PCV valve tends to become coked through oil and related contaminates, hindering that is operation. Symptom of a faulty PCV valve include bad idle high quality (rough idle), engine hesitation, loss of throttle response, extreme fuel in the engine oil, and also decreased fuel economy. The location and orientation the the PCV valve may vary by design year and also engine. The following procedures are based on the 2002 to 2004 version years, but lay the foundation for PCV valve instead of on any type of 1997 come 2010 Triton V-8.

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• locate the PCV valve. This 2 valve 4.6L V-8 has actually the PCV inserted into the passenger next valve cover. Some 3 valve 5.4L engines will have the PCV located on the driver next valve cover. The place is not global for every 4.6L/5.4L engines. If you"re having an obstacle locating it, referral the replacement component and map all hoses leading right into the entry manifold/plenum.


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• remove the hose at the outlet the the PCV valve. This may have actually a water tap clamp, or it may simply be a slip-fit style. Some models may have actually a heated PCV valve that needs an electric connector it is in removed.


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• top top this layout (reference image), the PCV is eliminated by transforming it respond to clockwise 90 levels with a wrench. Part PCV valves will be organized in place by 2 little bolts (3 valve 5.4L V-8s, for example). Remove the bolts and pull the PCV valve out. Some engines may also have a PCV valve that just slips into place.


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• Reinstall the PCV valve water tap and, if applicable, the water tap clamp and also wiring harness connector.

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