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Old 09-12-2019, 09:34 AM
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Oil coming through aftermarket filter

I keep getting this oil spatter from the aftermarket filter that was already there when I bought the YJ. Is this an issue?

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Old 09-12-2019, 10:55 AM   #2
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If you care about a clean engine then yes it is an issue... If you don't then no, not so much.

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Old 09-12-2019, 11:18 AM
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Quote:
Originally Posted by Gottagofast View Post
If you care about a clean engine then yes it is an issue... If you don't then no, not so much.


Fair enough ;-). As long as itís not a warning sign about worn valves or piston rings or some other serious issue.


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Old 09-12-2019, 12:29 PM   #4
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Your '94 2.5 probably has a CCV valve on the front of your valve cover. Sometimes it's mistakenly called a PCV.
If it isn't functioning properly (plugged or not connected properly) it can cause the oil spatter that you see.
The filter that you have allows clean air to enter the crankcase and the CCV regulates the flow of air out of the crankcase to be burnt during combustion.

If the CCV is properly connected and not plugged then you might have some blowby, indicating worn rings. If that's the case, I wouldn't worry about it. Just clean your engine and add a little oil as necessary and enjoy your new rig.

Most engines have some degree of blowby. As engines wear, blowby increases to the point that crankcase pressure (blowby) overwhelms the design of the CCV or PCV system and you get some "splatter" out of the air intake.
Older or high mileage vehicles are more prone to this and most of us simply live with it. It's just a fact of life.

On my 4.2 with almost 200K miles, when I drive around town, I get a little oil mist in my air cleaner. (Unlike OP, I have the stock setup, not an aftermarket filter).
When I drive long distances at highway speeds, my air filter gets oil saturated and I have to replace it. I usually carry a spare air filter and oil. Just a fact of life with old vehicles.

Good Luck, L.M.
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Old 09-12-2019, 01:20 PM   #5
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Actually that filter is connected where the ccv should be
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Currently in the stable: .....97 tj 2.5 5 speed stock... 97 tj 4.0 5 speed stock....04 tj 4.0 auto 4" and 33's... 98 tj roller for future build... 94 yj sahara 4.5" RE and 33's... 92 yj sbc 3/4 ton axles and 38's... Cj5,7,yj,xj,ex mud dragster project

TJ dash speakers that actually rock! Kicker sub and amp in center console
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Old 09-12-2019, 01:33 PM
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Well that doesn't sound good at all. I'm going to check the FSM and make sure they didn't screw something up before I got it (wouldn't be the first thing!). Thanks!
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Old 09-12-2019, 02:21 PM   #7
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Quote:
Originally Posted by Gottagofast View Post
Actually that filter is connected where the ccv should be
On some 4 cylinder engines I remember seeing a valve on the front drivers side of the valve cover. I was under the impression that that was the CCV. Not actually a valve, but a small orifice in a plastic or brass elbow.
I could be remembering a different year or an entirely different vehicle.

If that filter is where the CCV goes, where is the air inlet to the crankcase?
I guess I could find a post by Got it at last and look in his signature for the link to the Factory Service Manual for OP's Jeep. I'll leave that to OP though, since he needs to know about the CCV plumbing more than I do.
Look in the 2.5 engine section or the emissions section.

Good Luck, L.M.
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"Wrangler....It's not just a vehicle, It's a lifestyle".
.................................................. ........................
1987 YJ-4.2L-Standard Shift- Re-manufactured Carter Carb-2" body Lift-31X10.5X15 BFG KOs-190K Miles No back seat.
HEI distributor with computer and all related relays and wiring removed.
12K Badlands winch with dual batteries.
Warn front bumper. Matching imitation Warn bumper on the rear.
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Old 09-12-2019, 02:23 PM
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Checked the FSM and that is the correct location of the clean air intake for the 2.5L. Just need to make sure the vacuum pipe to the throttle body is clear now. Thanks guys!


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Old 09-12-2019, 02:31 PM   #9
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I could have sworn the line to the intake was on the back and line to air cleaner was on the front... oh well...
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Currently in the stable: .....97 tj 2.5 5 speed stock... 97 tj 4.0 5 speed stock....04 tj 4.0 auto 4" and 33's... 98 tj roller for future build... 94 yj sahara 4.5" RE and 33's... 92 yj sbc 3/4 ton axles and 38's... Cj5,7,yj,xj,ex mud dragster project

TJ dash speakers that actually rock! Kicker sub and amp in center console
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Old 09-12-2019, 02:47 PM   #10
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No actually, the elbow with the filter on it is supposed to have a hose going to the airbox. The small connection on the front driver side goes to manifold below the throttle body.
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Old 09-12-2019, 03:54 PM   #11
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Quote:
Originally Posted by 12b View Post
No actually, the elbow with the filter on it is supposed to have a hose going to the airbox. The small connection on the front driver side goes to manifold below the throttle body.
^^^This is how I remember the 4 cyl setup as being. I wouldn't worry about the filter or the elbow that's usually there being connected to the air box. Just as long as the crankcase can inhale filtered air.
That said, I would rather have everything as close to factory as possible unless I had a good reason for it to be different from factory. If OP has the factory air box, he might be able to return the crankcase air to original factory configuration. It's easier to wipe down the inside of the air box than clean the valve cover or the entire engine if he continues to get spatter.
Plus, it'll be easier to find a stock air filter at any small town parts store than to find a replacement filter that he currently has.

Good Luck, L.M.
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1987 YJ-4.2L-Standard Shift- Re-manufactured Carter Carb-2" body Lift-31X10.5X15 BFG KOs-190K Miles No back seat.
HEI distributor with computer and all related relays and wiring removed.
12K Badlands winch with dual batteries.
Warn front bumper. Matching imitation Warn bumper on the rear.
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Old 09-12-2019, 03:58 PM   #12
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Quote:
Originally Posted by jhendry View Post
Checked the FSM and that is the correct location of the clean air intake for the 2.5L. Just need to make sure the vacuum pipe to the throttle body is clear now. Thanks guys!
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There should be a small opening somewhere in the fitting that attaches to the valve cover. If you can get the hose off easily, you might be able to poke the orifice with a round toothpick or similar instrument.
I haven't done this so I'm simply speculating.

Other posters with 2.5 engines that have cleaned or replaced their CCV should chime in.

Good Luck, L.M.

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"Wrangler....It's not just a vehicle, It's a lifestyle".
.................................................. ........................
1987 YJ-4.2L-Standard Shift- Re-manufactured Carter Carb-2" body Lift-31X10.5X15 BFG KOs-190K Miles No back seat.
HEI distributor with computer and all related relays and wiring removed.
12K Badlands winch with dual batteries.
Warn front bumper. Matching imitation Warn bumper on the rear.
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