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The PCV valve is located on the back valve cover. Below are the directions for both 3.0L engine that Ford used in the 2005 Ford Taurus.
The two valve 3.0L has the PCV valve in the back valve cover just to the passenger side of the intake manifold on the top near the serpentine belt.
The four valve 3.0L has the PCV valve located on the drivers side of the rear valve cover mounted sideways.