4.2 leaking oil out of oil fill cap?
My 4.2 is leaking oil out of the oil fill capÖ It only does it when driving, Iíve never had any indication of this at idle.
The first thing I tried was a new filler cap thinking the seal may be bad. That didnít help.
I found searching online that in many cases that it is the pcv system. So I looked at mine, and I found and fixed a large leak in the system. Now, I can feel a lot of suction on from the pcv valve when I put my finger over it with the engine running. But, thereís still oil coming out of the fill cap.
I know that there has to be extra pressure in the engine for some reason that would cause it to force oil out, but I donít know what is causing it.
Anyone have any ideas?
Thanks in advance,
"Build a man a fire, and he'll be warm for a day. Set a man on fire, and he'll be warm for the rest of his life."
1990 White YJ TBI350, SM465, NP231, SOA, RE 1.5" SOA springs, Ford 8.8, D30, 4.10's, JBConversions SYE, XJ shaft, Bilstein 5150s, jb4x4 steering, MORE SS brakelines, 35x12.50 15 MT's, '95 YJ Brake Booster, '78 Grand Marquis MC, ZJ Prop. Valve