4.0 ccv issues
 

Ok..I've read the threads...talked to friends...been to the parts store.
So here is my issue...I have an 88 XJ the front vent elbow broke so i replaced it with a breather cap...shouldn't be a problem right?
Now I have oil all over the valve cover..STOP! I have checked the rear ccv and it appears clear (I blew through and no obstructions)...
I have pulled off the breather cap and started the engine to see if there was any vacuum pulling through the system...NO! there is vacuum at the manifold but no pull...what could be causing the positive pressure in the valve cover to push out oil.

i always wonder what was going on b4 it broke? was it all normal?.

can you get it back to the original state?

Seemed to be working just fine... front grommet got wasted and broke...that is why i figured the cap would work.

the problem about getting it back to the original state is finding parts

probably every junkyard in usa has jeeps, lots of parts/

did you check to see if your air filter box has oil in it? was it doing this b4?

I'm gonna leave this here for the CCV harness info, and this here for help with the oil soaked valve cover, and this here for just general good information. It's highly recommended to do tips 1-5 on an '88 Cherokee.
Cruiser is an active member on here and I'm sure will happily answer questions.

LOL, PNW, you saved me a lot of time!!!

Cruiser54 walks on water

Only in the shower.......

You've helped me out many a time, least I can do is lighten the load for you.

On another note, I recently came across another thread on here about swapping out the valve cover with one from a newer 4.0 with better CCV grommets. Basically 91+ has better CCV fittings, but every couple years has something a little different. Here is the post