Missing EGR PCV
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Missing EGR PCV
I have been chasing an exhaust smell in my truck and had totally overlooked the obvious. The PO had removed the air pump and all the PCV plumbing to go with it. My question is; can I somwhat re install the PCV system or am I better off with putting filters over the fresh air intake and PCV input?
I put temp filters to try and keep dust and dirt out but am trying to see if I can get the system back the way it should be set up. Novice in this area to boot.
I put temp filters to try and keep dust and dirt out but am trying to see if I can get the system back the way it should be set up. Novice in this area to boot.
Elder User
Joined: Aug 2012
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I would junkyard a full PCV setup and install. You want the negative crankcase pressure it provides, and keeps the dirt out as a bonus. The only thing bad about using an exposed filter instead of the PCV filter in the airbox is it's vulnerable to water if it's just attached to the valve cover.
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Thanks, I ordered a new PCV valve and the truck still has the CPRV in place and even connected to the canisters. I picked up a new crankcase breather but am out of luck on the tubing as it is obsolete. I am thinking I can make one. Finding these old bodies around here are few and far between, especially with the 460. (powerstrokes were the fav here)
I was hoping to find someone that may have run into a similar situation and (fingers crossed) has some pics......
I have a very basic diagram and my book doesnt even show a 460 so I am really winging here. My engine has many miles but I want to treat it nice in its old age as it has been good to me ; )
I really appreciate the info.
Corey
I was hoping to find someone that may have run into a similar situation and (fingers crossed) has some pics......
I have a very basic diagram and my book doesnt even show a 460 so I am really winging here. My engine has many miles but I want to treat it nice in its old age as it has been good to me ; )
I really appreciate the info.
Corey
Fleet Owner
Joined: Oct 2005
Posts: 20,789
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From: Kentucky
The secondary AIR system fed by the air pump has nothing to do with the PCV system. Perhaps I am misinterpreting your statement of your issue?
Fresh air is fed to the driver side valve cover from the air box. If the truck uses a MAF meter the air in drawn in after the meter. From there air is pulled through the engine crankcase via the PCV located on the passenger side valve cover. Vacuum is applied to the PCV from a port on the intake manifold.
Fresh air is fed to the driver side valve cover from the air box. If the truck uses a MAF meter the air in drawn in after the meter. From there air is pulled through the engine crankcase via the PCV located on the passenger side valve cover. Vacuum is applied to the PCV from a port on the intake manifold.
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Thanks for the info. The small diagram that I have shows a lead to the EGR. I have never messed with this system before so that is why I have posted here. Lots of well informed folks to point me in the right direction. I am picking up some parts today at the Ford place, Ill see if they can pull a better diagram for me. I believe I have all the required pieces for the system.
Corey
Corey
Fleet Owner
Joined: Oct 2005
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From: Kentucky
There is vacuum applied to the EGR valve by way of the EGR Valve Regulator (EVR). The computer (PCM) modulates the EVR on/off to control the EGR valve. This is yet another system on the truck that should not be confused with the PCV or secondary AIR system.
Elder User
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Are ALL of the hose pieces gone? If it's like a 351w, a 90 degree elbow exits the passenger valve cover connected to a hose that routes to between the intake manifold and firewall.
This is where the PCV valve mounts into the hose with a worm clamp. A hose then routes from the PCV around to the drivers side of the intake plenum.
The only other piece of the system is a length of tubing leading from under the oil fill cap on the valve cover, to the airbox where it connects to a filter that mounts inside the box.
Use a oil resistant line, like fuel line.
This is where the PCV valve mounts into the hose with a worm clamp. A hose then routes from the PCV around to the drivers side of the intake plenum.
The only other piece of the system is a length of tubing leading from under the oil fill cap on the valve cover, to the airbox where it connects to a filter that mounts inside the box.
Use a oil resistant line, like fuel line.
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Got the exhaust smell resolved. New PCV, and plumbing on passenger side from Ford. CPRV was still there so hooked them all up and routed to TB and did a little creative work on the driver side for the crankcase air and no more smell. It amazes me how the PO just cut stuff and left it hanging in the engine bay.
I appreciate all the input from everyone, it was very helpful.
Corey
I appreciate all the input from everyone, it was very helpful.
Corey
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From: Manchester, NH
Just as reference, on my 97 460, the PCV plumbing is as follows
Vacuum line from manifold vacuum via port on backside of intake manifold (against the firewall), to a 'T' at the PCV valve in the rear of the pass valve cover, runs forward to a 'T' at the purge valve beside the pass valve cover, and then runs to the charcoal can, mounted next to the battery. Obviously, then off to the gas tank(s).
That should also be on the under hood diagram for the vacuum system.
Also, have you done a compression or leak down test on the engine? The fact that you had a noticeable exhaust smell from the crank case is a sign of ring wear.
Vacuum line from manifold vacuum via port on backside of intake manifold (against the firewall), to a 'T' at the PCV valve in the rear of the pass valve cover, runs forward to a 'T' at the purge valve beside the pass valve cover, and then runs to the charcoal can, mounted next to the battery. Obviously, then off to the gas tank(s).
That should also be on the under hood diagram for the vacuum system.
Also, have you done a compression or leak down test on the engine? The fact that you had a noticeable exhaust smell from the crank case is a sign of ring wear.
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Jul 20, 2012 04:16 PM