removing pvc
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Elder User
Joined: May 2002
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From: Claremore, Ok 74017
removing pvc
I was wondering if it would be alright to remove the pcv and run just a air cleaner on it. Not worried about emissions and oil keeps being sucked out of it even new.
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removing pvc
Bigbadjs, the PCV system does not affect the Air/Fuel ratio for any engine. Yes, it is routed into the intake, but is of such small quantity that is does not affect performance. The main purpose is to rid the engine of blow-by gases (combustion gases that made it past the piston rings) and evaporating oil fumes. This system is operated by a PCV valve and tubing from the air cleaner (to provide fresh air) and from a manifold vacuum source. The pcv is a weighted valve that is sucked open by vacuum to allow the crankcase to vent the vapors and recieve fresh air. The vapors are sucked into the vaccum line , into the intake and burned. Most of the vapors are already inert gasses that are not combustible (at least in an engine that has good rings), the oil fumes are not harmful to the engine.
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Elder User
Joined: May 2002
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From: Claremore, Ok 74017
removing pvc
The reason I want to get rid of is because it is leaking oil out and alot of oil gets into the intake, and a new pvc did not seem to work. Even if you could tell me a good vent cap that I could put on instead of a pvc and still pull vacumn would work. And yes the baffle is still there.
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Joined: Mar 2003
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From: Cloud USA
removing pvc
I would think the oil would be blowing out the Vent tube if the PCV isnt hooked up, Maybe you could hook up a resevoir to catch the oil that is spewed from the motor. I would leave it, if the motor isnt running poorly because of burning too much oil.
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Elder User
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removing pvc
I would not remove the system. If you are having that much oil in the air intake (under the air filter, at least mine is), you may have a lot of blow-by. You may need rings. Perform a cyclinder leak down test to check for bad rings. If you feel air from the breather hose going to the air box, you have worn rings. Check all the hoses for the PCV valve and make sure that they are all hooked up where they are supposed to be and not clogged. If every thing is correct, do you have the breather filter on inside the air filter box? Is there enough oil to leak out the bottom of the air filter box? do you have vacuum from the manifold to the valve? if so, can you measure it? should be the same as the measured from the vacuum tree.
Last edited by fishin1976; Sep 17, 2003 at 03:16 PM.
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Posting Guru
Joined: Dec 2002
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From: Billings MT
removing pvc
I guess I am kind of confused. Oil is coming out the PCV line? That means blowby. All engines have blow-by to some extent.
What do you think will happen with an element on it, and not a valve that is supposed to cycle open/closed? You will have an open valve and oil will come out it even more.
The PCV is a one way valve, out of the valve cover, not into. I would check all your vacuum lines and there should be a solenoid in the plumbing for the PCV. If that solenoid isn't shutting the vacuum off, the PCV will be open the entire time, which would be the same as a breather on it.
What do you think will happen with an element on it, and not a valve that is supposed to cycle open/closed? You will have an open valve and oil will come out it even more.
The PCV is a one way valve, out of the valve cover, not into. I would check all your vacuum lines and there should be a solenoid in the plumbing for the PCV. If that solenoid isn't shutting the vacuum off, the PCV will be open the entire time, which would be the same as a breather on it.
Lead Driver
Joined: Nov 2002
Posts: 9,557
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From: Concord, NC
removing pvc
There's no solonoid...the valve is the pcv valve. The valve itself should open and shut on its own due to changes in manifold vacuum. You said even a new valve sucked oil up? What brand was it? I'd try a motorcraft if you just had a generic pcv valve from the aftermarket.