big engine problem

[jrwnova]

im having some big engine problem and i can't figure it out and everyone tell me different...i have a 258ci with about 140000miles on it, i noticed im getting blowby into my breather filter and oil is getting sucked into my air filter i just changed the timming chain, cover, and oil pan gasket but i've been told that doesn't matter i did a compression test and all 6 cyl was near if not perfect any ideas?

[dmxjg35]

do a search over on jeep forums there is a few things it can be, i dont remember off the top of my head but i know there was a post on jeep forum that listed everything

didnt relize the seach was down on jf but i did a little searching and found these links that should help you out

OIL IN AIR FILTER (BLOW BY) FIXES
www.off-road.com/jeep/cherokee/xjtech/engine/40ltr/blowby.htm
www.off-road.com/jeep/cherokee/98/04_apr/valvecover/cover.html
www.madxj.com/MADXJ/technical/technicalfiles/JAvalveCover/ValveCover.htm

[ROCKREADYXJ]

im having some big engine problem and i can't figure it out and everyone tell me different...i have a 258ci with about 140000miles on it, i noticed im getting blowby into my breather filter and oil is getting sucked into my air filter i just changed the timming chain, cover, and oil pan gasket but i've been told that doesn't matter i did a compression test and all 6 cyl was near if not perfect any ideas?

to check for blowby you need to do a cylinder leak down test different then a compression test. but what were your readings on all the cylinders?and did you do it with all the plugs out or in?

[tj4xfun]

heres my take. if you have good compression and the engine runs strong i would first check the valve cover pcv valve system. i've noticed in the past the vacume port on the intake gets clogged or the vacume line from the port to the pcv valve colapses. your engine needs to breath and thats what the pcv (positive crankcase ventilation) system does. with the high miles and the symptoms you've described it sounds like a clogged pcv system to me. first trace the vacume line from the pcv valve to the intake manifold and unplug it at the manifold while its running, the engine rpm should go up and a vacume leak should be very obvious. if not its a clogged vacume port at the manifold. if there is really good vacume at the port check the line and the pcv valve. the lines break down over years and colapse and pcv valves clog. most mechanics dont replace pcv valves as part of a tune-up anymore, theres a good chance its original. good luck and let us know what you find.

[mv420xx]

check my thread...

http://www.tri-state4x4.com/forums/showthread.php?t=1072&highlight=filter

[jrwnova]

well i want to thank everyone with all of there help and i'll get on all the info i was given...when i did a compresion test i did leave all of the plugs in and with it they all were pretty close to perfect if anyone else has more information that would be great thanks

[tj4xfun]

anything yet? i'm anxious to see what the fix is. let us know.

[mv420xx]

a fix would be to rebuild the engine...

[ROCKREADYXJ]

well i want to thank everyone with all of there help and i'll get on all the info i was given...when i did a compresion test i did leave all of the plugs in and with it they all were pretty close to perfect if anyone else has more information that would be great thanks

what were your readings? oh yeah was that wet or dry?

[jrwnova]

i tried a few things and nothing really helps...my reading were between 145-149 with the spark plugs in and dry

[jrwnova]

ok i redid my compession test on my jeep with all of the sparkplugs out and these are the reading i got....#1-165 #2-165 #3-165 #4-180 #5-165 #6-170 i don't know why they are so high now, now what should i do?