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New guy with PCV system question


 
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granda
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Joined: 13 Nov 2006

PostPosted: Mon Nov 13, 2006 10:37 am    Post subject: New guy with PCV system question Reply with quote

I just got a 1990 cherokee with the 4.0 six and I have some questions.
According to my Chilton manual I have a CCV system instead of a PVC system, I pulled the CCV fitting from the rear grommet in the valve cover with the engine running and there was no suction so I pulled the fitting and tubing off and cleaned it all out. It was plugged pretty bad. Now that it is cleaned it passes air from both directions unlike a PCV valve. Is this normal or is there supposed to be a check valve in there? Also the manual says there should be suction from the rubber elbow at the front top of the valve cover but I have none. There is a reference to a "metered orifice fitting" but I don't know what or where that is. It looks to me that the rubber elbow at the front top of the valve cover goes right into the air cleaner box. I don't see any"metered orifice fitting" Any help is appreciated, Thanks!
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Tardis
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Joined: 07 Aug 2004
Location: Ohio

PostPosted: Mon Nov 13, 2006 8:11 pm    Post subject: Reply with quote

Quote:
According to my Chilton manual I have a CCV system instead of a PVC system,...Is this normal or is there supposed to be a check valve in there?

That's correct. 2.5 & 4.0L motors have CCV(Crank Case Vents). They don't have check balls/check valves. The front hose is the fresh air feed from the air cleaner, the rear hose is the CCV feed to the fitting on the intake.
Quote:
There is a reference to a "metered orifice fitting"

The fitting is on the intake. The metering orifice is the small hole drilled in the fitting.
Quote:
Also the manual says there should be suction from the rubber elbow at the front top of the valve cover but I have none.

The valve cover, intake ports, fresh air/CCV hoses, CCV fitting could be plugged with carbon/sludge; blocking the ports, and hoses etc. Check for sludge build up. You might have to take the valve cover off and unblock the ports. My friends 88 XJ had this problem. A blocked fresh air hose and valve cover ports caused the problem. After cleaning the valve cover port, and replacing the hose, everything worked fine.
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98' TJ, 99' XJ
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granda
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Joined: 13 Nov 2006

PostPosted: Tue Nov 14, 2006 3:04 pm    Post subject: I pulled the valve cover off Reply with quote

and everything was was gummed up but nothing was restricted. I cleaned the valve cover,took apart the baffles and cleaned them and then cleaned the rocker arms and oil passages with carburetor cleaner. Everything was reassembled but still no suction at the front rubber hose that goes to the air cleaner. I changed the engine oil and filter as well. It sure seem to run better. Thanks for the reply
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pipxj
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Joined: 22 Jan 2006

PostPosted: Fri Nov 17, 2006 3:57 am    Post subject: Reply with quote

My 2.5 has a small brass fitting that connects a hose from the filter box at the front of the valve cover. I found that this was clogged. After unclogging it with carb cleaner I have good suction.
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