PCV valve
Fleet Mechanic
Joined: Aug 2001
Posts: 1,526
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From: Round Rock, TX
Originally Posted by oldmarine
Great thread. For what engines would this fix be applicable? I have a 1990 F-350 w/ 7.5 efi
Elder User
Joined: Sep 2004
Posts: 941
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There is a Ford TSB on this subject. I think I found it elsewhere on this site.
The Ford proposed fix is to plug PCV takeoff near the #8 runner and to drill and tap the center of the manifold. Then a new PCV port is screwed into the new hole. This basically retrofits the design to the current production version, albeit probably with more work and expense than just a tee to an existing vacuum line.
Ford probably didn't take the route of "tee'ing" an existing vaccuum line due to wories about the PCV flow potentially clogging and interfering with other vaccuum operated systems. But anyone reading this forum should be capable of checking for this potential condition every other oil change or so.
The Ford proposed fix is to plug PCV takeoff near the #8 runner and to drill and tap the center of the manifold. Then a new PCV port is screwed into the new hole. This basically retrofits the design to the current production version, albeit probably with more work and expense than just a tee to an existing vacuum line.
Ford probably didn't take the route of "tee'ing" an existing vaccuum line due to wories about the PCV flow potentially clogging and interfering with other vaccuum operated systems. But anyone reading this forum should be capable of checking for this potential condition every other oil change or so.
Posting Guru
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From: Remsen, NY
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Senior User
Joined: Dec 2001
Posts: 220
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From: MN
Ford must have changed something in the '94 F150's too because my truck's PCV valve doesn't hook up to the rear of the upper intake. Referring to bigric's photo, my vacuum tree is located one runner toward the rear of the engine from where his is and my PCV valve is hooked to it's own fitting located where his vacuum tree is. Anyone else's look like mine?
Senior User
Joined: Jun 2002
Posts: 117
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From: SC
Originally Posted by bigric
Here's a picture for those of you who asked:
Heck, I even had a spare 3/8" cap to put on the old vac fitting on the back of the intake!Thanks for the pic bigric, and for the info fellas!!
Wade
Fleet Mechanic
Joined: Aug 2001
Posts: 1,526
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From: Round Rock, TX
For more fun, if you've got a problem with oil getting sucked through your PCV system, try this:
The BF412 filter comes from Autozone, and the PCV valve is the standard one but without the tree installed.
The BF412 filter comes from Autozone, and the PCV valve is the standard one but without the tree installed.
Senior User
Joined: Jan 2004
Posts: 342
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From: British Columbia
bringing back an old thread
Originally Posted by TexasGuy001
I have a 95 F150 with a 302 and automatic. I've heard that disconnecting the pcv valve and connecting it to the vacuum tree on the plenum will increase the life of the engine and could make the truck run better. Anyone else heard this too?? If so, does it actually do any good or will it cause harm??
Thanks
Thanks
New User
Joined: Apr 2009
Posts: 1
Likes: 0
95 150 oil
Hi there,
I have a 95 F150 w/5.0 in it with auto trans.
It runs smooth and has pwr but it burns oil.
There is no blow-by, does not leak, however, ther is oil in the upper intake and egr valve. I also noticed oil in the back of the engin on the firewall. not alot. It smokes blue when you first start it up and then goes away while driveing. Is it the pcv system. I can't find the valve on this engine. Do you think that is where the oil on the firewall is comming from? Thanks
I have a 95 F150 w/5.0 in it with auto trans.
It runs smooth and has pwr but it burns oil.
There is no blow-by, does not leak, however, ther is oil in the upper intake and egr valve. I also noticed oil in the back of the engin on the firewall. not alot. It smokes blue when you first start it up and then goes away while driveing. Is it the pcv system. I can't find the valve on this engine. Do you think that is where the oil on the firewall is comming from? Thanks
Junior User
Joined: Dec 2009
Posts: 56
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well i just preformed this mod and luckily i had the plenum tree with an extra vacuum connection on it thanks on the mod i already lost an engine due to lack of compression in #8 cylinder hopefully this keeps her running the idle smoothed out but when i rev it and let go the engine kinda goes vvvvrrroooooommmm pop pop that has nothing to do with the mod rite just my exhaust leak?
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