Oil back pressure into the Air filter

FORD F-150
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ENRIQUEPAGAN
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F150 1990 5.0 efi 386k miles, 2WD Reg. Cab. I am getting oil backing up from the valve cover plastic vacuum hose into my Air Filter. any suggestions on what can be causing this. I was thinking oil pump any suggestions would be greatly appreciated.
Aug 29, 2007 at 3:41 PM
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MERLIN2021
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Take the filler cap off and inspect it...any whitish foamy stuff? if yes change the PCV. With the cap off start the truck, any blue smoke there?, and lastly do a pressure test if need be.
Aug 29, 2007 at 4:15 PM