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  #1  
Old 10-19-2010, 10:40 AM
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Jeep WJ oil dissapearing, not leaking

Hey guys, I have an 02 WJ Limited w/4.7L high output V8. For the last 4-6 months, i have been having to add about 1-1 1/2 quarts of oil about 2.5k miles after an oil change. The engine in my jeep only has about 40k miles on it, and i replaced the pcv about 8 months ago, simply because i never had and its recommended to do every so often. After replacing the pcv, i had to replace the short rubber hose connecting the pcv to the plastic breather tube about 4 times because it kept getting oil saturated and sucking closed, causing oil loss. Now i have a hose with a hard plastic inner shell to keep it from sucking closed, but i am still losing oil somehow. There is oil residue on the TB and in the resonator box, so i know it has to be pcv related. There are no external leaks, and the engine does not use oil, but the oil has to be going SOMEWHERE. Someone please help me; the pressure gauge usually reads about 3/4 in normal conditions, but stays at a constant 1/2 when the oil begins running low. Also, when the oil level gets low, an engine speed relative ticking sound can be heard (im assuming valvetrain related due to low oil), but as soon as more oil is added the ticking goes away. When i notice this ticking sound, there is usually just enough oil to barely show on the bottom of the dipstick (about 1/2" to 3/4" below the "add" word/line). I need some help if anyone knows what could be causing this or knows of any fixes, should i replace the pcv valve again? or the rubber hose? the breather nipple things on the back of the heads? if anyone else has had this problem or knows of ANY way to help me, please PLEASE help me out, im at my wits end right now lol
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2002 Jeep Grand Cherokee Limited 4.7L H.O., 6" lift with 35" Fierce Attitude MT tires mounted on 17x9 KMC XD Series Hoss wheels, 4.56 gears sitting in the garage until I find the time, Superchips Flashpaq, Ram air, Straightpiped exhaust, Full sound system, Full metal ARB front bumper w/Smittybilt XRC8 winch, Lots of other goodies, and a nice ~2" fender trim front and rear :)
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  #2  
Old 10-20-2010, 01:16 AM
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Re: Jeep WJ oil dissapearing, not leaking

Have the same problem on my 4.7. Never had to add any oil in between the regular oil change intervals and then suddenly just before the last oil change i also saw that the level was below the normal servicing band. No external leaks. Mine has 130.000 Km. Had to add 1+ Ltr to be at the upper side of the band.
I had changed my PCV as well some 4 months ago and have ordered again a new one to see if this will solve my problem. If the PCV gets stuck or doesnīt function right, it can cause oil use. On mine the PCV is connected to a line which connects downstream of the TB, so any excess oil use will not be shown on the TB itself. The 2 cylinder head breathers connect directly to the resonator box and cause the oil fouling of the TB. When the TB never has been cleaned, it can become quite messy, but doesnīt necessarily mean that this is the point where the oil disappears.
I hope the PCV will come in next week ( takes ages overhere to get something)and will report back if this solved the problem some 2 weeks later, after i have driven enough Kmīs to see the result.
If this doesnīt help, i will pull the plugs to see if there is any oil fouling of the plugs.
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Old 10-21-2010, 01:00 PM
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Re: Jeep WJ oil dissapearing, not leaking

If this all started after you replaced the PCV valve, then I would suspect that you got a defective one.

I would start by getting another new PCV valve or if you kept the original one, try putting it back and see if your oil problem goes away.

Oh and don't let it get low enough to start making noise in the valve train. Check the dipstick every so often and when it gets down to close to the add mark then put some more oil in.
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Old 11-29-2010, 06:56 PM
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Re: Jeep WJ oil dissapearing, not leaking

Any update from your side 02grandcherokee?
I had changed the PCV valve some 2 weeks ago and have driven 1200 Km since and didnīt see the oil level going down sofar. Keep my fingers crossed, but it seems that the PCV valve change did the trick.
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Old 01-26-2011, 09:21 AM
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Re: Jeep WJ oil dissapearing, not leaking

sorry for the late reply guys... well i found a few weeks ago that both the large curved breather tubes attached to rear of the heads were "banana peeled" and completely disconnected, so i replaced those and it slowed down the leak, but im still losing a little bit somewhere... I'm gonna replace the gasket between the filler neck and head soon and see if that helps, i pulled it off last night and its flat as can be and there was a good little bit of oil that i could tell had squeezed by
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Old 01-26-2011, 09:21 AM
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Re: Jeep WJ oil dissapearing, not leaking

Quote:
Originally Posted by Frango100 View Post
Any update from your side 02grandcherokee?
I had changed the PCV valve some 2 weeks ago and have driven 1200 Km since and didnīt see the oil level going down sofar. Keep my fingers crossed, but it seems that the PCV valve change did the trick.
-Hope this fixed it for you! haha it sucks not knowing what needs to be replaced to fix it
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Old 01-31-2011, 02:26 PM
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Re: Jeep WJ oil dissapearing, not leaking

Anybody else have any input? This is still driving me crazy lol, I replaced the filler cap neck gasket because I know that you always start looking for the leak at the highest and furthest foward place (on the engine) that there is oil visible where its not supposed to be, because obviously gravity pulls oil down and when your driving fast enough for the wind to blow oil, it blows it towards the rear . Little bit o logic there
I have noticed though that there seems to be oil coming from somewhere above the passenger side engine mounting bracket, and looks like it could be running down a few wires near that area onto my steering stabilizer and track rod... as well as a miniscule amount running down the block and collecting just below the very bottom of the timing case cover (not nearly enough for me to suspect the cover gasket or front crank seal though)
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Old 01-31-2011, 03:36 PM
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Re: Jeep WJ oil dissapearing, not leaking

Unfortunately the oil consumption is also still there on my WJ. Its less than before, but in 7000 Km i still had to put 3 Lts extra, and before this whole story i didnīt had to put any oil in between the servicing intervals. When i have some time, i will remove the breather lines on top of the cilinder head covers and see if there is something wrong overthere. There seems to be some checkvalves in those lines. When i took the line from the resonator box, i didnīt feel any flow coming from the cilinder head side. Donīt know if this is normal though.
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Old 04-13-2011, 08:34 AM
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Re: Jeep WJ oil dissapearing, not leaking

Quote:
Originally Posted by Frango100 View Post
Unfortunately the oil consumption is also still there on my WJ. Its less than before, but in 7000 Km i still had to put 3 Lts extra, and before this whole story i didnīt had to put any oil in between the servicing intervals. When i have some time, i will remove the breather lines on top of the cilinder head covers and see if there is something wrong overthere. There seems to be some checkvalves in those lines. When i took the line from the resonator box, i didnīt feel any flow coming from the cilinder head side. Donīt know if this is normal though.
yeah i ended up printing the pcv test procedure off from all data and performed in my garage at the house... turns out that it doesnt have anything to do with the pcv, or it would at least seem that way being that it passed the inspection with flying colors lol... I'm beginning to wonder if it could possibly be the valve cover gaskets... you tried anything since january frango?
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Old 04-13-2011, 09:10 AM
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Re: Jeep WJ oil dissapearing, not leaking

If it would be the valve cover gasket(s), you would see some oil stains or leakage.
Iīm now running 5W40 synthetic in the engine and didnīt see any significant drop in the level since 2500 Km. I did remove the valve cover breather lines and restrictor valves before, but didnīt notice anything wrong there. There is only quite some oil in the PCV line. Iīm looking for a catch can to put in there, because all this oil will be fauling the intake, valves and cylinders.
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