Ford Engine Problem. Oil spurge, or oil backup problem into my air filter box.?

1992 Ford F 150 had oil leak one day after driving it. Checked under the hood and found oil underneath my air filter box and running down the wheel well. Found out there was an oil back up into the air filter box coming from the engine breathe tube, which leads to the air filter box. So, just wondering what would cause this and if I am going to need a new engine or something. The truck runs fine now but burns a little oil and feels under powered so I think I might have a piston problem... Please any mechanics have any thoughts.

Ford Engine Problem. Oil spurge, or oil backup problem into my air filter box.?
In addition to replacing the PCV valve and the associated lines, replace the air filter as it is probably clogged with oil. Just as a follow up also check your vacuum lines and spark plug wires. Look for cracks and /or dry rot replace all bad wires and lines.


Good Luck
Reply:It sounds like wear on the rings, and the blow-by is pushing oil back up thru the breathers. When you remove the oil filler cap, you should feel a very slight vacuum. If not, check the compression on all cylinders, if one is much lower than the rest, bad news. Shoot a little oil into that cylinder. If the compression goes up, you need a rebuild.
Reply:PVC is clogged or not working.
Reply:If you've checked the PCV valve and it's OK, you're probably getting a lot of leakage past your compression rings. Take the oil cap off and see how much combustion gas is coming out. I would have to think you have quite a few miles on it and it's time for either a ring job or rebuild.
Reply:Check your PCV valve. Also check your compression on each cylinder. If you find any low cylinders put a little oil into the cylinder and recheck. If it raises the compression substanially you have a broken or worn ring. A broken ring would allow combustion gases to enter the crankcase and cause your problem with oil blowing into airbox.
Reply:replace the pcv valve and clear the line.