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Unread 05-18-2013, 06:54 PM   #1
codenameanimal
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1993 YJ Wrangler 
 
Join Date: Jun 2011
Location: Chambersburg, PA
Posts: 19
93 Jeep Wrangler 4.0l oil issue

Hi,
all i have been having an issue with loosing oil from my 4.0 engine in the 93 wrangler. This past fall i replaced the oil pan and rear main seal gaskets and still no fix. I know that with those two the other common leak is the valve cover, but the thing is i can never find oil ever leaking nor by the valve cover. About once a month I have to add a quart of oil. I did notice though on the last oil change there was oil residue in my air filter. So I was wondering if anyone may know what is causing this. The engine seems to run fine it is just annoying to have to add the quart every month plus not easy on the wallet once it starts to add up.


Thanks for any info

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Unread 05-18-2013, 07:00 PM   #2
disarm6565
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1993 YJ Wrangler 
 
Join Date: May 2004
Location: Austin, TX
Posts: 268
Blow by, either a vacuum issue or head gasket leak. Possibly burning oil too.
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1993 4.0 AX-15
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Unread 05-18-2013, 07:08 PM   #3
codenameanimal
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1993 YJ Wrangler 
 
Join Date: Jun 2011
Location: Chambersburg, PA
Posts: 19
Quote:
Originally Posted by disarm6565 View Post
Blow by, either a vacuum issue or head gasket leak. Possibly burning oil too.
Yeah I think that is where my oil has been burning since I cannot seem to find any leaks. The vehicle itself feels like it always has and doesn't seem like a head gasket leak plus my oil doesn't look milky either. Any suggestions as to what vacuum lines could cause this so I can look at that tomorrow
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1993 Jeep Wrangler 4.0 with AX-15 mostly stock with a 2.5" pro comp lift and a 1" Daystar body lift with 30" tires With Dynaflow exhaust, with hard top and Bestop softop, and Bestop replacement seats
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Unread 05-18-2013, 07:52 PM   #4
jameslinn83
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1992 YJ Wrangler 
 
Join Date: Apr 2010
Location: Cold Spring, MN
Posts: 47
I had a similar problem on my 92 when I first got it. I replaced the valve cover gasket, oil pan, rear main seal an no luck. The problem was my pcv system was not clear and it was causing pressure in the crankcase and causing oil to come out of my dipstick from the extra crankcase pressure.
Make sure the line from the valve cover to the air box is totally clear, in fact replace it all and make sure there is a good seal on your distick.
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Unread 05-18-2013, 10:09 PM   #5
idaholtby
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1991 YJ Wrangler 
 
Join Date: Apr 2008
Location: Meridian, Idaho
Posts: 2,554
Remove your valve cover and flip it over. You will see what looks like a triangular shaped tower directly below each elbow fitting. Inside of both of these is a baffle that commonly clogs with carbon. Remove both and thoroughly clean these baffles. If clogged, this can easily cause blow bye and the oil consumption that you are experiencing.
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Unread 05-19-2013, 07:32 PM   #6
heyvern
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1994 YJ Wrangler 
 
Join Date: Jan 2012
Location: South Central Pa, Pa
Posts: 36
The larger line at the front of the valve cover is there to allow air into the block, the smaller line at rear of the valve cover running to a fitting on the intake manifold is a vacuum line. If the vacuum line is clogged, pressure will push oil out through the intake line making you air filter wet with oil. I had this problem for a while until I learned all of this here on JFK. I don't remember who posted it, but it worked for me.
By the way my '94 came from Don's in Chambersburg.
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Unread 05-23-2013, 05:13 PM   #7
codenameanimal
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1993 YJ Wrangler 
 
Join Date: Jun 2011
Location: Chambersburg, PA
Posts: 19
Quote:
Originally Posted by heyvern View Post
The larger line at the front of the valve cover is there to allow air into the block, the smaller line at rear of the valve cover running to a fitting on the intake manifold is a vacuum line. If the vacuum line is clogged, pressure will push oil out through the intake line making you air filter wet with oil. I had this problem for a while until I learned all of this here on JFK. I don't remember who posted it, but it worked for me.
By the way my '94 came from Don's in Chambersburg.
Yep I know Dons auto that is where I have had any major mechanical repair done that i didn't have time to do done by Barry Don's son and never had issues although to find a wrangler there anymore seems to be very slim now adays. Anyways thanks for all of the suggestions and I will look at the Jeep this weekend to see if I can get the think to stop guling the oil to save me some cash darn oil monster
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1993 Jeep Wrangler 4.0 with AX-15 mostly stock with a 2.5" pro comp lift and a 1" Daystar body lift with 30" tires With Dynaflow exhaust, with hard top and Bestop softop, and Bestop replacement seats
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