Littleurb3
Active Member
- Joined
- Oct 24, 2007
- Location
- somewhereville
What does this mean when you find a small amount of oil in the air filter and box?
What does this mean?
- Thread starter Littleurb3
- Start date
3DCrawler
Well-Known Member
- Joined
- Sep 26, 2005
- Location
- Granite Falls, NC
What type of vehicle?
jeepn-jason
Well-Known Member
- Joined
- Mar 20, 2005
- Location
- Greensboro
usually either a bad pcv valve or worn out rings causing blowby.
Littleurb3
Active Member
- Joined
- Oct 24, 2007
- Location
- somewhereville
91 Jeep XJ 4.0 inline 6
- Joined
- Mar 10, 2005
- Location
- Hooterville (24171)
wrangler00
Active Member
- Joined
- Jun 16, 2009
- Location
- morganton
this is my guess
Actually, with a 4.0 I'd bet its a clogged CCV 
Pull both ends off and clean. They have a tendency to be a pain to remove and sometimes either the rubber grommets or the plastic elbows will break apart. Replacements are only a couple bucks at the dealership.
The rear one is not a real valve, just a tiny pinhole which can become clogged. I'd start with that one first. Probably won't even need to remove the front one.
Pull both ends off and clean. They have a tendency to be a pain to remove and sometimes either the rubber grommets or the plastic elbows will break apart. Replacements are only a couple bucks at the dealership.
The rear one is not a real valve, just a tiny pinhole which can become clogged. I'd start with that one first. Probably won't even need to remove the front one.
95GranZJ
Well-Known Member
- Joined
- Dec 31, 2009
- Location
- Winston Salem
^2 had a XJ that i wanted to make into a crawler, i just had to take some air and clean all the valves and box, then flip your filter to the clean side, drive it for a while then cheak again
a_kelley
mechanical fixer
- Joined
- Jan 26, 2010
- Location
- Rutherfordton
<suggested wornout rings/blowby>
to verify that, you can stick your hand over the oil cap hole and rev the motor.. if you have enough blowby, you can feel the crankcase gasses come out. could be a little blowby AND the drain ports in the head are clogged, resulting in oil not draining back to the crankcase, filling up and being blown out by just a little blowby. (that happened on mine, did head gasket and cleaned the tar (literally) out of the valve cover, rockers, and drain holes, and drain ports.. I have a picture somewhere.. shop vac was useful.
to verify that, you can stick your hand over the oil cap hole and rev the motor.. if you have enough blowby, you can feel the crankcase gasses come out. could be a little blowby AND the drain ports in the head are clogged, resulting in oil not draining back to the crankcase, filling up and being blown out by just a little blowby. (that happened on mine, did head gasket and cleaned the tar (literally) out of the valve cover, rockers, and drain holes, and drain ports.. I have a picture somewhere.. shop vac was useful.