oil in my airfilter box - Off-Road Forums & Discussion Groups
Jeep-Short Wheelbase All discussion of short wheelbase Jeeps: CJ, TJ, YJ and JK

 
LinkBack Thread Tools Display Modes
post #1 of (permalink) Old 03-12-2005, 10:53 AM
larry2c
Guest
 
Posts: n/a
oil in my airfilter box

Hope somebody has an idea on this one because I'm stumped. My '89 YJ has the 2.5L engine and lately I have been having a problem with oil being blown back into the aircleaner through the vent tube that runs from the valve cover into the aircleaner box.

This only seems to happen when I have been doing some extended highway driving. If I am just running around town or out on the trails it doesn't appear to be happening, but if I go on the freeway for around 10 miles or more (more rev's) I will find oil in the bottom of the aircleaner box.

The engine has about 118K on it, but it seems to run strong and there is never any evidence of smoke coming out of the tail pipe. The pcv valve seemed to be working fine, but I replaced it anyway just in case. No difference. If I pull the breather tube out of the valve cover and hold a thumb over it while revving the engine, it doesn't feel like there is any pressure there.

I'm stumped and getting kind of tired of coming home from a run and having my Jeep bleed all over everything. Anybody got any ideas?
[img]images/graemlins/confused.gif[/img]
Sponsored Links
Advertisement
 
post #2 of (permalink) Old 03-12-2005, 01:37 PM
Moderator
 
Jim_Lou's Avatar
 
Join Date: Dec 2001
Location: Belleville, Illinois
Posts: 11,485
Thanks: 15
Thanked 22 Times in 17 Posts
         
Re: oil in my airfilter box

You've probably got more blowby at highway speeds that the PCV valve can handle. Try a new PCV valve. If that doesn't cure it, run a compression test. It might be that you'll have to live with it or rebuild the engine.

I had that problem once and made a manifold that allowed me to put two PCV valves in parallel. That helped some but didn't cure it.
Jim_Lou is offline  
post #3 of (permalink) Old 03-12-2005, 02:52 PM
I Might Just Know What I'm Talking About
 
Raduckal's Avatar
 
Join Date: Sep 1999
Location: Owensboro, KY
Posts: 1,905
Thanks: 3
Thanked 4 Times in 4 Posts
 
Re: oil in my airfilter box

Larry,
This subject has been beat to death and lots of info can be found on here, if you are patient. Our search function is having some problems.

Personally, I've had great luck with blow-by by adding an oil additive called Restore.
Raduckal is offline  
Sponsored Links
Advertisement
 
post #4 of (permalink) Old 03-13-2005, 06:00 PM
larry2c
Guest
 
Posts: n/a
Re: oil in my airfilter box

You're right, I wasn't patient. My first search returned a lot of threads that were'nt what I was looking for and I didn't feel like "waiting" until I could do another search. I'll try to be more patient.

Meanwhile, I have borrowed a compression tester from a friend and I will be checking the cylinders this week. I have replaced the PCV valve and that made no difference.

I am also thinking about creating a "catch can" to run the vent hose into. THis would allow me to avoid the oil all over my air filter and leaking out of the box until I can pull the engine out (if that's what it needs). Any thoughts on that idea?
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Off-Road Forums & Discussion Groups forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome