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No solution from me, Note: Sounds like your pretty familiar with the Positive crankcase ventilation (PCV). You said the valve is pulling a vacuum I am assuming it is from the intake manifold side correct? With the PCV was working sure seems like it would keep the oil from coming out of the dipstick tube. I am stumped as well, sounds almost like too much blow by from the cyclinders you already stated that with the possible broken compression rings?
could have bad pcv valve check and see if pcv getting vacuum take thumb see can you feel vacuum suction with engine running if no pcv valve bad or not getting vacuum check make sure pcv valve hose is not disconnect or broken is so replace vacuum hose.if pcv valve good and getting vacuum.problem could be your piston rings and oil control rings worn out or has too much oil in crank case.
it may be the pcv valve ( positive crankcase ventilation) that needs replaced. if a pcv valve fails, it will put oil in air cleaner or throttle body. check to be sure hose to valve is not clogged up. its only about a 5.00 part. have a good one !!
have you checked the pcv valve hose assembly? it runs from the passanger side valve cover(pcv valve) to the back of the engine in the intake manifold. the connection at the manifold gets oil saturated internally and caused the hose to **** shut. replace the whole hose assembly if so, it's a ford part only but not too terribly expensive. good luck.
On top of the valve cover there is a fresh air breather unit. Make sure the breather unit is not plugged. Also the fixed orificePCV should be clear. Find a tool that will go through the orifice and make sure it is clean. Remove the vacuum hose and check it for cracks or internal damage. With the engine running, make sure you have vacuum through the hose. Let me know when your finished cleaning the crankcase breather system. Regards,
The PCV valve can be located in several places. The most common location is in a rubber grommet in the valve cover. It can be installed in the middle of the hose connections, as well as installed directly in the intake manifold.
Once the PCV valve is located, make sure all the PCV system hoses are properly connected and that they have no breaks or cracks.
Remove the air cleaner and inspect the air and crankcase filters. Crankcase blowby can clog these with oil. Clean or replace such filters.
Oil in the air cleaner assembly indicates that the PCV valve or hoses are plugged.
Make sure you check these and replace the valve and clean the hoses and air cleaner assembly.
When the PCV valve and hose are in satisfactory condition and there is oil in the air cleaner assembly, perform a cylinder compression test to check for worn cylinders and piston rings.
A clogged PCV valve or EGR valve is what I'd think of - mainly the PCV valve. Replace it along with any hoses that feed it or that it empties into, since if the valve is bad, or sludged up, it's likely that the hoses have a coating of oil sludge inside as well. A bad PCV will cause excess pressure in the crankcase, leading to oil leaks and losses.