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Unread 03-18-2010, 11:16 AM   #1
boostjunkie
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WJ massive oil consumption

It's a 2000 limited with around 120k on the clock.
I bought this car stock with about 118k on it late last year and it was fine didn't burn oil or anything. Good running car, pretty mint. I lifted the truck right away before I even did my first oil change. I did oil change and it was fine for a while and out of nowhere started eating up massive amounts of oil, no leaks, smokes a bit but not as much as it should for the amount of oil it's going thru. I've added 4 courts this last 2500miles and as of this morning I think I'm a court or so low. The truck did develope a nasty tick at cold start up, sounds like the top half of the motor is being starved of oil until it warms up. One of my guesses if valve seals but that bad? I'm gonna do compression test this weekend. Any ideas guys?

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Unread 03-18-2010, 11:38 AM   #2
Double E
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Which engine?
Fill out your profile.

Measuring thru the dipstick, right? Certain the dipstick is seated correctly?
Smokes on start up or all the time?
Hows the antifreeze?
Do you have any mods we should know about? (remote oil cooler, oil filter mods, etc?)

Compression test is a good start... let us kow the results and answers to the above.
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Unread 03-18-2010, 12:14 PM   #3
CrazyIvan888
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I agree with E, the first thing I would inspect would be the antifreeze. Then rent a compression tester from AZ and let us know what you find out.

BTW, you killed 2 kittens with your post.

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Unread 03-18-2010, 12:30 PM   #4
boostjunkie
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Sorry it's a 4.7, dipstick is seated correctly, smokes on start up as far as i know. I have a compression tester on hand so that's not an issue, I do not have any mods motorwise.

Drain coolant to check? I haven't gotten around to changing heater core so that's messed up. Doubt it's got anything to do with it but figured I'd throw it out there.

Killed 2 kittens? Lol.. Sorry explain
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Unread 03-18-2010, 12:43 PM   #5
RevNL
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Check the crankcase breather and intake for signs of oil. Could be blowing oil out through the breather and then burning it. Bad PCV valve and/or charcoal canister? The old 4.2L sixes did that a lot. I wonder if a 4.7 might do the same.
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Unread 03-18-2010, 01:06 PM   #6
boostjunkie
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Yea I have to invest a day in going over everything I've just been real busy at work so haven't had much free time and just throwing oil into it to keep it alive.

Why would I be getting such a bad tick at start up? Oil pressure reads around 60 at start up and stays pretty close when warmed up. I have however gotten a check guage light twice and oil pressure read 0 since owning it but lasted a few seconds and came back on. Bad sensor? Oil pump?
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Unread 03-18-2010, 01:09 PM   #7
boostjunkie
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I also have a rough idle as well.. Mainly stays at around 700ish but will sometimes surge to 1200 and stay
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Unread 03-18-2010, 01:10 PM   #8
erockz
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His pooor ca... um jeep. lol. Another kittens life spared.
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Unread 03-18-2010, 02:52 PM   #9
boostjunkie
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Quote:
Originally Posted by erockz View Post
His pooor ca... um jeep. lol. Another kittens life spared.
Ahh lol noted! Thanks
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Unread 03-19-2010, 10:20 PM   #10
boostjunkie
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Ok I was able to do a compression test just now, I haven't drained oil or coolant yet but dd notice a lot of oil by the IAC housing and throttle body. I don't know the order of cylinders but I will put it down as if you were looking at the engine bay from the front.

155 145 <-- rear of motor
152 153
155 150
160 150 <-- front of motor
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Unread 03-19-2010, 10:36 PM   #11
Kruzin
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Don't need to drain the coolant.
Just open the cap and look at it. Maybe draw a sample from the radiator.
How's it look?

And how do you fit a whole tennis court of oil in there?
Mine can only hold 5 quarts.
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Unread 03-19-2010, 10:58 PM   #12
boostjunkie
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Haha very true sorry.. I really do know how to spell it, don't know why i spelled it like that. Good catch, I'm done for the night but will check coolant tomorrow, I am going to drain anyways since I will be doin the heater core of the jeep
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Unread 03-19-2010, 11:13 PM   #13
QuadraTokn
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A lifted WJ in Chicago? I wanna see it!
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Unread 03-19-2010, 11:26 PM   #14
WiCkeDuDe
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The 4.7s are very picky about oil. Ask me how I know. The hydraulic lifter valves did the same on mine and ticked then went away. It turned out though that the oil pump was going out and there was alot of crap in the passageways. Your compression seems pretty high there. Maybe you just lost some valve seals.
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Unread 03-20-2010, 12:19 AM   #15
Kruzin
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Valve seals should not cause massive oil loss.
Valve guides, maybe, but not the seals.
But bad guides will usually also produce a clattering noise.

Bad valve seals will cause some smoke out the tailpipe at startup.
But not so much once running. And generally not such a massive use of oil.

This is why we have been saying to check the coolant.
It sounds more like a bad head gasket than anything else, from the limited info we have...
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