zebvance

ok so I guess what I am Mainly confused about Is what part is causing the blockage, that is intern is causing me to have oil going into my oil filter?

salad

It is likely the tubing from the rear CCV elbow to the manifold, or the elbow itself. Once these guys get clogged with oil, then the only path out of the valve cover is via the front tube which runs to the air box.

freegdr

ac has nothing to do with these line napa sell the vacuum assembly that should be on your year......https://www.cherokeeforum.com/f2/87-...-issues-61900/

1stTimeComancheOwner

The orifice rear grommet looks new. How did ya get that? I'm looking for replacement grommets for the valve cover.

Koin

I know this is thread resurrection, but as I probably won't be the only one looking this up in the future for a solution- I felt compelled to write a better explanation based on my findings.

The engineers designed it this way because of a couple reasons.

During idle, you have higher vacuum at the intake manifold, which is the rear tube. It is smaller, because less venting is needed due to the lower rpm creating less pressure.

During times of higher rpm, you have less vacuum at the intake manifold (rear hose), yet a much higher pressure. The large tube in the front is sized to accommodate the increased pressure at higher rpm. You do have more vacuum in the air box from air passing by into the intake, but the reason it is here is to circulate the fumes back into the intake. The high pressure and low flow of the back tube creates the situation to flow forwards into the front tube.

This is all designed to regulate the flow based on the rpm, not to create a constant direction of flow! So, this is why it is said to cut 1" off the valve cover tubes (inside the VC) to help resist sucking up oil, and not change the diameter or locations of where the tubes run.

If the guy in this thread with the MJ cut those tubes, that is probably why it isn't oily. Not necessarily because it's only flowing in one direction towards the back. However, because of this he may not be recirculating the gasses reducing efficiency and increasing pollution from a less complete burn.

I don't think there is a very good solution to this problem. On another thread a guy mentioned incorporating a catch can for any oil that does flow into the lines- I believe this is probably the best option along with cutting down the internal tubes. I was going to do the small filter option until I learned about why there is different sized tubes and how the flow is meant to move in both directions based on rpm and vacuum.