Where is the oil separator lower intake manifold pcv valve on a ford taurus v 6 3.0 24 valve dohc engine?

Its between the lower and upper intake manifolds. It is part of the lower intake manifold and is covered by the upper intake tubing. It's like the surfer riding the ocean with the waves curled over head. In the 3.0 dohc's case the ocean would be the lower intake, where the oil separator rides while the upper intake manifold tubing curls over the top of if. If your lucky you can see just the leading surface with a flash light. The PCV valve is here. Start at the air intake end, look under the intake for a special Ford hose assembly; its 3 piece. At the air intake theres a elbow attached to the bottom, its diameter starts at about 1-1/2" and transends to about 5/8" at the plastic or metal formed tube (year dependant). That tube goes down and under the upper manifold where it attaches to a short 2" hose, which in turn connects to the pcv valve. The valve on my 02 is a black plastic piece. It inserts into the oil separator with a quarter turn to the right. It has a square flange about 3/4" back from the valves tube opening. I used a piece of 3/4" sq alumimum tubing (it has and Inner sq of about 5/8") to remove and insert my valve. It you can find a 5/8" 8 point 1/2" socket it will also work. I am told that the rubber elbow I mentioned above is the weak link in this system. It seems that after many hot/cold cycles under the hood that its material weakens and allows the systems vaccuum to collaspe the elbow. I could find this assembly at the dealer only and for a cost of about $32. The motorcraft pcv was $6 or $7. I am told however that the dealer is asking nearly $200 to install the valve. I havent asked them, so I hope this is an urban myth. Good luck.