Breather Filter
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Elder User
Joined: Feb 2004
Posts: 500
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From: Oregon
Breather Filter
Can someone enlighten me on why Ford put a breather filter in the airbox on my 1992 5.8? It runs from the filler neck on the valve cover through a hose into the side of the airbox. In there lies a filter in which hot air is coming out of! Why? This is only the second EFI Ford I've owned and my '96 4.9 doesn't have that.
I'm planning on correcting that by completely removing the stock filler neck, and just setting a breather directly on the valve cover.
Oh, one more thing, are all PCV valves created equal? I mean I know they will differ slightly from vehicle to vehicle to allow a certain amount of air out right? I had bought one for my 5.8, which had two male ends. When I replaced it, I bought one not for my vehicle, but it only had one end on it, which is all I need. Will it really matter?
Thanks
I'm planning on correcting that by completely removing the stock filler neck, and just setting a breather directly on the valve cover.
Oh, one more thing, are all PCV valves created equal? I mean I know they will differ slightly from vehicle to vehicle to allow a certain amount of air out right? I had bought one for my 5.8, which had two male ends. When I replaced it, I bought one not for my vehicle, but it only had one end on it, which is all I need. Will it really matter?
Thanks
Last edited by threefiftyone; May 31, 2004 at 04:50 PM.
Lead Driver
Joined: Nov 2002
Posts: 9,557
Likes: 44
From: Concord, NC
I've always been told to get the PCV valve from the dealer, so you know it is the exact one for your vehicle, and not a generic one. The '96 doesn't have the breather because it is mass air, and pulls the crankcase vent from the incoming air stream after the MAF meter. All non-MAF Ford trucks have the breather in the air filter housing. There shouldn't be any air coming out of this though if your PCV system is working correctly.
Senior User
Joined: Feb 2004
Posts: 453
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From: RI
Someone will probably correct me as I don't fuly understand the system, but I believe the breather element is there to allow air from the air cleaner housing (fresh air) into the engine/crankcase through that tube to the valve cover. I think the rationale is to have continuous circulation of air through the crankase, entering through the breather element, passing through the crankcase, and exiting through the pcv valve.
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