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Bad PCV valve? '99 Taurus #5383576 03/23/20 09:59 AM
Joined: Apr 2010
Posts: 4,409
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atikovi Offline OP
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It rattles when I shake it like it's supposed to, but if I blow or suck on the hose end of it, air flows freely. Isn't it supposed to block flow in one direction?

Re: Bad PCV valve? '99 Taurus [Re: atikovi] #5383582 03/23/20 10:07 AM
Joined: Sep 2015
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mk378 Offline
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No. It's a restriction not a check valve. The restriction increases when there is high vacuum, but it never completely closes.

Re: Bad PCV valve? '99 Taurus [Re: atikovi] #5383585 03/23/20 10:09 AM
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97prizm Offline
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Mine acted like this and caused an excessive oil leak. I replaced it and now its much better.


If at first you don't succeed fail fail again. (Waldorf and Statler.)
1997 Geo Prizm...DEAD
1984 Mazda RX-7 Spec 7
2005 Dodge Neon
Re: Bad PCV valve? '99 Taurus [Re: atikovi] #5383594 03/23/20 10:16 AM
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WyrTwister Offline
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The PCV valves I have replaced have been fairly cheap . In that case , if in doubt , replace it .


Wyr
God bless
Re: Bad PCV valve? '99 Taurus [Re: atikovi] #5383601 03/23/20 10:26 AM
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atikovi Offline OP
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16 bucks for Motorcraft although aftermarket is $4 plus the hose is pretty cracked so another $13. Could this be why it goes to over 2000 rpm on a cold start for a few seconds?

Re: Bad PCV valve? '99 Taurus [Re: atikovi] #5383629 03/23/20 11:01 AM
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ragtoplvr Offline
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do not forget the hose and passage into the intake. They can have sime buildup and plug, also seen the liner separate and collapse. If you replace do not get cheap hose.

Rod

Re: Bad PCV valve? '99 Taurus [Re: atikovi] #5383680 03/23/20 12:10 PM
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Jackson_Slugger Offline
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I picked up a Motorcraft PCV for a 3.0L 24v ordering at WM for about $10...

Re: Bad PCV valve? '99 Taurus [Re: atikovi] #5383839 03/23/20 03:31 PM
Joined: Jun 2012
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oldhp Offline
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Don't use fuel line hose, too thin. When ever I've replaced hoses I used automatic transmission hose, thicker wall. If your replacing the PCV replace the hose too.


"None of us are getting out here alive.....drink that beer.....eat that pizza......drive that Hot Rod"
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