What Did I Do - big oil leak - ???

I recently bought an 87 tc - 114k on her. Always used Mobil1. I gave her a much deserved oil change over the weekend and left her in the garage. When I changed the oil I noticed that the pvc valve coming out of the valve cover - and another tyoe of "pcv like" valve were disconected. I plugged them both back in. My son used the car last night to go to work - about a 8 mile round trip. This morning there was about a quart of mobil1 on the garage floor. I looked at the oil filter thinking that I might not have screwed it on tight but it was dry. I shock the pvc valves and they did not rattle (clogged I assume) so I unplugged both valves. Added a quart of oil and ran the car for a half an hour - no leaks or drips. Took the car to work this morning - no leaks at all. Would the clogged valves have done this? I know what the pvc valve is but can you tell me what the other valve does - it is near the altenator and plugs into a hose that goes into a black square type box. Any information would be appreceated.

Thank you.

The second PCV valve you described behind the alternator IS the PCV that all 2.3(turbo or not)have. The black box is the oil seperator to keep the PCV from drawing oil vapor into the cylinders. Sounds like someone added a second valve to your engine. And yes a plugged PCV system will cause oil leaks due to excess pressure in the crankcase, especially in a turbo engine.

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Two 1988 Turbo Coupes ..... yea one of em has a 5.0 And runs 13.3s

The valve that's in your valve cover is the breather. It should have a rubber line running to it. The one behind the alternator is the PCV.The rubber hose for the PVC turns hard after time and the PCV will fall out easily. Replace the dry and harden hoses.

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85.5 TC 5 speed, K&N filter charger, Ranger Roller cam, 3" exhaust system, manual boost valve, large VAM, SVO PE computer, front mount intercooler & sport grille, underdrive pulley, ported upper and lower intakes,flow matched injectors, ported E6 manifold, 245/45/17 wheels & Tires,140 mph speedo, under restoration

The PCV behind the alternator, if plugged allows pressure to build in the crankcase which can cause oil leaks. If it is also allowing boost to get to the crankcase, this will cause some great leaks and I have even heard of dipsticls being blown out of the tube. If you can blow through the small end of the valve, it's letting boost into the cranckcase. Use ONLY the FORD valve. Since the hoses are getting old and soft put hose clamps also

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NATO Member
88 TC X 2, 86 SVO, Main TC with K&N, 3"DP to 2.5"duals through Dynamax, Ric valve at 17+ and disconnected KS.
Elite Bodega 16" chrome wheels. Autometer pod w/ A/F and Vac/boost gauges.140 mph Motorsports Speedo New engine: Total Seal rings and TRW pistons, ported and polished head w/ cc'd chambers,1.59"exhausts, SS valves, gutted upper, knife edged lower, A-230 cam, Race Engineering Adj Cam Sprocket, Crowlers, ARP head studs, and rod bolts. Walbro 255 HP pump and Kirban adj FPR, T-3. Centerforce II, KB subs and jack rails.