Why there???
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Laughing Gas
Joined: Dec 2003
Posts: 752
Likes: 32
From: North Carolina
Why there???
I have an '06 Ext.cab Ranger w/5spd trans. . I have already experienced a sticky throttle due to carbon buildup on the throttle body. After cleaning, no more problem. Here's the question.
Why does Ford route the line for the PCV valve back into the intake pipe,before the throttle body?? This allows all of the vapors and mist sucked up by the vacuum draw to go right across the throttle body, and fouling it up.
Why not go straight into the intake, behind the throttle body, and keep this area a lot cleaner? Or am I just too picky??
Why does Ford route the line for the PCV valve back into the intake pipe,before the throttle body?? This allows all of the vapors and mist sucked up by the vacuum draw to go right across the throttle body, and fouling it up.
Why not go straight into the intake, behind the throttle body, and keep this area a lot cleaner? Or am I just too picky??
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Laughing Gas
Joined: Dec 2003
Posts: 752
Likes: 32
From: North Carolina
I must agree on the service bit, but they lose out on me, 'cause I do it all myself. Personally, I know that everyone is not capable or have the time to do it themselves, but if I could not do this level of work myself, I should not drive. But what the heck, if I could find another port on the intake, I would reroute it myself, I just haven't looked. This took place with only 15k on the clock, so I look forward to doing this often,as I drive about 50k a year. I'll have to to do some more looking under the hood. Thanks for the input.
Post Fiend
Joined: Feb 2003
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From: Eastern WA
Originally Posted by travlnman
Why does Ford route the line for the PCV valve back into the intake pipe,before the throttle body??
Postmaster
Joined: Jan 2003
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From: Durham, NC
Originally Posted by CowboyBilly9Mile
Ford does not route the vac line from the PCV valve to before the throttle body plate as there would not be sufficient vac to operate the PCV valve properly. You are looking at the vent line from the engine to upstream of the TB; this is part of the CCVS. Manufactures have been using this emission system (CCVS) for well over 30 years now. A new engine breaking in *might* leave a fine film on the TB plate; not much to worry about. What we're talking about here has nothing whatsoever to do with "sell service" but rather it's an emission system. Pretty basic.
Oh, and welcome back, you have been missed!!!!!!
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Laughing Gas
Joined: Dec 2003
Posts: 752
Likes: 32
From: North Carolina
Cowboy, your answer may be technically correct. However let me carry on for a minute. I understand the need to vent the engine. All engines have blowby, no matter who makes them or how old or new, so I get that. Why not route it to the intake also?? If there is too much vacuum, you could use a check valve to limit the amount of draw. When I cleaned my throttle body, there was a light brown greasy mess all over it. This is due to the fact that this line goes to the cam cover, what most call the "valve cover". When my little 4-banger is going down the highway at 3,000 rpm, there is no way that the vapor and mist that is most certainly being whipped up by the cam's, is not being sucked into this line.
It may not be a "pcv valve" by definition, but my point remains, that it could have been done better. It's no big deal, as I will continue my fanatical maintenance as I always have (600,000 miles w/no problems) I just get curious from time to time as to why things are the way they are. I guess this is just one of those things. Once again guys thanks for the input.
It may not be a "pcv valve" by definition, but my point remains, that it could have been done better. It's no big deal, as I will continue my fanatical maintenance as I always have (600,000 miles w/no problems) I just get curious from time to time as to why things are the way they are. I guess this is just one of those things. Once again guys thanks for the input.
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Post Fiend
Joined: Feb 2003
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From: Eastern WA
Ummm, if there's any doubts about my answer *maybe* being correct, I'd strongly suggest doing a bit of research and reading into how the CCVS system and the PCV system work. Your PCV is in fact routed to your intake, this is required for it to function properly (sufficient vac) . It's not about it could have been done better, but the fact that the CCVS is basically sealed to atmosphere while the engine is running. How can that be done any better? Sealed per se with engine running. No crankcase vapors escape to ambient unlesssomeone molested the system, especially if it's a blowby buggy.
*I almost wished I didn't stoke the stove..........................
*I almost wished I didn't stoke the stove..........................
Last edited by CowboyBilly9Mile; Oct 11, 2006 at 11:57 PM.
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Posting Legend
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Cowboy is correct, the vent line must go to the intake system before the throttle body. Unfortunately when the engine is stopped there are some vapors that escape thru the vent line which coat the inside of the intake and throttle body. With a worn out engine under full throttle more vapor can escape. Especially if the PCV is worn out. Just because they rattle does not mean they are any good. Replace them annually.
Hotshot
Joined: Dec 2003
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From: iowa
Bill and Eric are both correct and it's been this way since the 70s. Go look at a carbed engine with a PCV system and you will see the valve cover on the oposite side of the engine from the PCV valve has a hose that is routed up to the aircleaner. These used to cause the aircleaners (actually still do) to get coated with oil.