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Unread 06-18-2013, 02:20 PM   #1
geusey
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1992 YJ Wrangler 
 
Join Date: Jun 2008
Location: Morton, Texas
Posts: 242
4.0 blowby question...

First of all, this isn't just another "why is there oil in my air filter?" thread.

I've known about the air filter, PCV valve issues for a while now. After going over the PCV system, replacing all the grommets, tubes, and clearing them of oi, my problem is that it STILL blows oil into the air filter. I know the line is clear of oil because I can feel suction in the line and the grommet going into the valve cover is brand new and free of oil.
I read somewhere that if it is still doing this after fixing the valve cover issues, then I have excessive blowby and my piston rings are shot. Is this true? Could I be missing something?

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Unread 06-18-2013, 02:41 PM   #2
idaholtby
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1991 YJ Wrangler 
 
Join Date: Apr 2008
Location: Meridian, Idaho
Posts: 2,554
Quote:
Originally Posted by geusey View Post
First of all, this isn't just another "why is there oil in my air filter?" thread.

I've known about the air filter, PCV valve issues for a while now. After going over the PCV system, replacing all the grommets, tubes, and clearing them of oi, my problem is that it STILL blows oil into the air filter. I know the line is clear of oil because I can feel suction in the line and the grommet going into the valve cover is brand new and free of oil.
I read somewhere that if it is still doing this after fixing the valve cover issues, then I have excessive blowby and my piston rings are shot. Is this true? Could I be missing something?
Did you remove the valve cover, flip it over, remove the two "splash" towers attached to the inside of the cover and then clean the baffles out as well? I ask as you did not specifically state this, plus your rig does not have an actual PCV valve, it is a simple restricted orifice elbow, no valve. Looks identical to a PCV valve, but not. These baffles will clog over time and cause this issue.
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Unread 06-18-2013, 02:49 PM   #3
geusey
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1992 YJ Wrangler 
 
Join Date: Jun 2008
Location: Morton, Texas
Posts: 242
Quote:
Originally Posted by idaholtby View Post
Did you remove the valve cover, flip it over, remove the two "splash" towers attached to the inside of the cover and then clean the baffles out as well? I ask as you did not specifically state this, plus your rig does not have an actual PCV valve, it is a simple restricted orifice elbow, no valve. Looks identical to a PCV valve, but not. These baffles will clog over time and cause this issue.
Yes I did. It's perfectly clear, thanks for asking. i forgot to include that I did that.
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Unread 06-18-2013, 03:00 PM   #4
idaholtby
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1991 YJ Wrangler 
 
Join Date: Apr 2008
Location: Meridian, Idaho
Posts: 2,554
Quote:
Originally Posted by geusey View Post
Yes I did. It's perfectly clear, thanks for asking. i forgot to include that I did that.
Well, usually this will fix these type of issues. I would suggest that your next move would be to perform a compression test so that you know what you are dealing with.
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