cheapcherokee93
<----boat-manche
- Location
- Guadalahabra, CA
okay, so there is some background to this issue. the original engine in my 88 MJ was leaking horribly out of everywhere, never could figure it out. well eventually it started knocking so i replaced the engine with a working lower mileage unit. took the old one apart to find a hole in piston #6. i assume that it started as a crack or a small hole so it was pushing pressure through the piston and into the crank case causing the oil to leak out of every seal.
so after i replaced the engine i didn't have the issue any more, problem solved right? nope.
before, i was also getting oil through the CCV? hose (the largest one towards the front of the valve cover, which goes to the intake box) and it was so bad that i would leave puddles of oil everywhere from the air box. before the problem was solved (the new engine) i purchased new vacuum line loom set, including the small line towards the back of the valve cover that feeds into the intake manifold, and that slowed down the problem. the problem has now surfaced back to my new engine, and i cannot comprehend why.
I have been driving on the new engine for a few months now, including lots of highway driving. it wasn't until last week when i went wheeling when it started getting oil in the intake again.
the new engine is not completely stock, so i will list the non-stock things in it that might be contributing?
-mild comp cam
-bosch type 3 injectors
-melling high volume oil pump
-pacesetter header
thats really the only direct engine mods I've done. still running stock intake and full exhaust w/cat. I'm also running 10w-40 oil (don't have to worry about the cold here in SoCal).
one more note. since i have no idea if this could be linked, but i'll put it in here anyway. we went wheeling in a rather high elevation (10,000 ft) and i noticed that it seems to idle low (300 rpms) while in the high altitude. there were 4 other XJs w/4.0s there that did not see this affect while up there. i think it might not be adjusting to the high altitude properly?
so, if anyone has any ideas/theories/hunches as to what could be causing this problem to resurface, please reply!
edit: i should note that it only leaks with constant highway driving. around town and while wheeling it leaks much much less
so after i replaced the engine i didn't have the issue any more, problem solved right? nope.
before, i was also getting oil through the CCV? hose (the largest one towards the front of the valve cover, which goes to the intake box) and it was so bad that i would leave puddles of oil everywhere from the air box. before the problem was solved (the new engine) i purchased new vacuum line loom set, including the small line towards the back of the valve cover that feeds into the intake manifold, and that slowed down the problem. the problem has now surfaced back to my new engine, and i cannot comprehend why.
I have been driving on the new engine for a few months now, including lots of highway driving. it wasn't until last week when i went wheeling when it started getting oil in the intake again.
the new engine is not completely stock, so i will list the non-stock things in it that might be contributing?
-mild comp cam
-bosch type 3 injectors
-melling high volume oil pump
-pacesetter header
thats really the only direct engine mods I've done. still running stock intake and full exhaust w/cat. I'm also running 10w-40 oil (don't have to worry about the cold here in SoCal).
one more note. since i have no idea if this could be linked, but i'll put it in here anyway. we went wheeling in a rather high elevation (10,000 ft) and i noticed that it seems to idle low (300 rpms) while in the high altitude. there were 4 other XJs w/4.0s there that did not see this affect while up there. i think it might not be adjusting to the high altitude properly?
so, if anyone has any ideas/theories/hunches as to what could be causing this problem to resurface, please reply!
edit: i should note that it only leaks with constant highway driving. around town and while wheeling it leaks much much less