Whats wrong w my xj??? Please help
#1
Seasoned Member
Thread Starter
Join Date: Jun 2011
Location: Van Buren Arkansas, was Joplin Missouri
Posts: 276
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1990
Model: Cherokee
Engine: 4.0L
Whats wrong w my xj??? Please help
My xj 4.0 is pumping oil into the air filter box. Soaking half the air filter w oil and puddling up in the intake box. What causes this. Was told the 4.0 does this a little bit but omg this isn't just a little bit of oil. It's coming from a tube from the front part of the valve cover just in front of the oil fill cap and runs into the airbox. Please help me out.
#2
CF Veteran
Join Date: May 2009
Location: Glen Burnie, MD
Posts: 1,844
Likes: 0
Received 3 Likes
on
3 Posts
Year: 1994
Model: Cherokee
Engine: 4.0 H.O. K&N, Borla headers, custom down pipe, magnaflow hi-flo cat, flowmaster to turn down tip
yes a little is normal, but it sounds like you are spitting to much. take the little tube off of the valve cover and make sure your baffle is still there.
#3
Seasoned Member
Thread Starter
Join Date: Jun 2011
Location: Van Buren Arkansas, was Joplin Missouri
Posts: 276
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1990
Model: Cherokee
Engine: 4.0L
I have the valve cover off to see what's going on under there and these r just gummed up w nasty deposits so I took them off to clean it
#4
Senior Member
Join Date: Nov 2008
Location: south bend indiana
Posts: 953
Likes: 0
Received 7 Likes
on
6 Posts
Year: 1993
Model: Cherokee(XJ)
Engine: 4.0 i six H.O.
also make sure your back tube and connectors are not clogged either and theres vacuum on the intake port. no vacuum means it'll blow out into your air filter. i did mine a couple of months ago.
#5
Senior Member
Join Date: Oct 2010
Location: Everett, WA
Posts: 842
Likes: 0
Received 4 Likes
on
4 Posts
Year: 1996
Model: Grand Cherokee
Engine: 5.2L
actually its not "normal", but its common. when I bought my XJ, there was a quart of oil in the airbox. turns out the vac line going from the valve cover to the TB was clogged, so the oil was blowing into the airbox. I got rid of that tube, put a double barb fitting in the VC, and ran some vac hose. problem solved.
#7
Seasoned Member
Thread Starter
Join Date: Jun 2011
Location: Van Buren Arkansas, was Joplin Missouri
Posts: 276
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1990
Model: Cherokee
Engine: 4.0L
The tube in the back is new( like 1 1/2 months ago) but the oil is coming thru this pipe. WTF is this? Lol not sure what it does. And where can u buy it. Oreilly's here don't sell it neither does autozone. They say the dealer. I'm not sure so... This thing is getting the best of me.
Trending Topics
#10
Senior Member
Join Date: Nov 2008
Location: south bend indiana
Posts: 953
Likes: 0
Received 7 Likes
on
6 Posts
Year: 1993
Model: Cherokee(XJ)
Engine: 4.0 i six H.O.
The tube in the back is new( like 1 1/2 months ago) but the oil is coming thru this pipe. WTF is this? Lol not sure what it does. And where can u buy it. Oreilly's here don't sell it neither does autozone. They say the dealer. I'm not sure so... This thing is getting the best of me.
#11
Member
Join Date: Aug 2009
Location: Centinnial, CO
Posts: 137
Likes: 0
Received 2 Likes
on
1 Post
Year: 2004
Model: Grand Cherokee
Engine: 4.7L V8
The back hose is the CCV (Crank Case Vent) hose on a 1990 some refer to it as a PCV but it is not the same as a PCV Valve, it should be a hard line like the other vacuum lines coming off of that connector by the large hose you are talking about. using a soft line will cause it to pinch from the vacuum allowing the intake to suck oil through the breather hose (the large front one) and dump it on the air filter since this is now a higer source of vacuum than the CCV is being supplied with. I was able to find a new CCV with grommet at checker for $7. it is made by Dorman part number 46005. when I pulled off the old grommet and the soft line installed by the PO and installed the new hard line the problem went away. You may have to have this part special ordered or try and find it online. do not leave the old grommet in just because it it a PITA to get out, do it correctly.
#13
Senior Member
Join Date: Oct 2010
Location: Everett, WA
Posts: 842
Likes: 0
Received 4 Likes
on
4 Posts
Year: 1996
Model: Grand Cherokee
Engine: 5.2L
The back hose is the CCV (Crank Case Vent) hose on a 1990 some refer to it as a PCV but it is not the same as a PCV Valve, it should be a hard line like the other vacuum lines coming off of that connector by the large hose you are talking about. using a soft line will cause it to pinch from the vacuum allowing the intake to suck oil through the breather hose (the large front one) and dump it on the air filter since this is now a higer source of vacuum than the CCV is being supplied with. I was able to find a new CCV with grommet at checker for $7. it is made by Dorman part number 46005. when I pulled off the old grommet and the soft line installed by the PO and installed the new hard line the problem went away. You may have to have this part special ordered or try and find it online. do not leave the old grommet in just because it it a PITA to get out, do it correctly.
#14
Senior Member
Join Date: Oct 2010
Location: Everett, WA
Posts: 842
Likes: 0
Received 4 Likes
on
4 Posts
Year: 1996
Model: Grand Cherokee
Engine: 5.2L
lol thanks, it was a mess when I bought it but I stripped it down to the longblock and replace the gaskets and painted everything, pretty sure most of the paint on the block is just covering grease
#15
Seasoned Member
Thread Starter
Join Date: Jun 2011
Location: Van Buren Arkansas, was Joplin Missouri
Posts: 276
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1990
Model: Cherokee
Engine: 4.0L
Well it's all back together now, put in a k&n filter this time, now I'm gonna run it a few days pretty hard then check the filter and see if she has oil back in the air intake box.