Originally Posted by AZ Jeff
If you are using the front opening the valve cover to vent crankcase vapors, WHERE is your inlet for fresh air into the crankcase?
The crankcase ventilation system needs an inlet and an outlet. Sounds like you turned your inlet into an outlet, so where is the new inlet?
Originally Posted by BB1980
The way it was designed was to allow fresh filtered air to enter the valve cover on the front connection
That is the inlet. The front is the inlet that should let fresh air IN to the crankcase, and the rear vents it into the intake. The problem comes when the rear gets clogged and it trys to vent through the front into the airbox and gets oil into the filter and can get up to the throttle body as well due to engine suction. I was trying to put a PCV in line to not allow the front to vent backwards into the airbox, but found out tonight that when the rear gets clogged, the crankcase gets pressurized and the jeep started sputtering in high gear under load. There was oil trying to push past the oil fill cap to vent out.
A better fix would probably be to allow the front to go both ways but to put a catch bottle inline that would collect the oil and be able to be drained.
This link is for an XJ Jaguar I found while searching, but looks interesting.