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PCV Reroute

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60K views 58 replies 29 participants last post by  jeremymoore_TX  
#1 ·
Hello again, I've read a lot about this reroute, but I haven't actually seen a write-up on it.
If there is one, then oh well, now there's 2. There's TSB from Ford about the original way
the PCV valve is routed. Basically the PCV dumps the oil\moisture\etc into the last 2 cylinders,
number 4 and number 8, but mainly number 8 and has caused numerous engine failures.
The TSB has us pull the upper plenum, drill a hole on the passenger side of the plenum, tap it,
and run the PCV valve to the new hole. That was entirely too much work for me, so I
decided to reroute it with the brake booster.
For those that want a link to the TSB, here ya go:
http://www.fordfuelinjection.com/files/Reroute_PVC.pdf

Tools:
Pliers (maybe? if you can't get the hose off with your hands)
Beer

Parts:
About 2.5-3 feet of hose for the PCV (I used 11/32")

To get started, pull your PCV valve, including the hose thats run to the intake Plenum, you can
see the PCV here (you do NOT need to pull your engine to do this).
Image

Save your PCV (or replace it if you want), and throw the stock PCV hose at the dog.
First, let's watch some Discovery Channel, it's mating season for the North American PCV valve:
Image

It appears to have found a mate:
Image

After a very inappropriate mating ritual, you have:
Image

Almost done! head back over to your truck and unplug your brake booster hose from the vacuum tree.
Here's a pic of how it is run normally:
Image

Here it is unplugged:
Image

Run the brake booster hose to the back of the intake plenum (where the PCV hose used
to be plugged into) and plug it in.
Image

Take your new PCV valve\hose combination and plug the end without the PCV valve attached
into the Vacuum tree.
Image

Run the hose around the back of the intake plenum and put the PCV valve back into
your valve cover.
Image

Run into the valve cover, don't mind the RTV, my gromet didn't fit quite right.
Image

Drink beer. Done!
 
#4 ·
:rockon..Nice write up and pictures, I think just swapping hoses is a simple easy way to go...I did make a quick video of my re-route on www.supermotors.net/17406 TSB re-route.

A couple of weeks ago I went and checked everything under the FI plenum and found a bit of blowby coming up the hose because the PCV wasn't sitting all the way in the valve cover hole and I didn't like the hose I had on there either, it was larger in diameter and softer and don't know what I was thinking at the time so I took it apart and I had kept the original brake booster hose which was smaller in diameter and harder, it was just long enough to reach up the FI plenum tree nicely and I clamped each end and seems to better.....

I'll check it again today..I used the Motorcraft PCV but did't use the "F" piece on it because I didn't want to struggle getting in that VC hole but the angle of the hose then can make the PCV 'tilt" because there's not enough "bend " in the hose....PITA....you'd think Ford would have left enough clearance under there so it would fit in easily and not struggle or have to lift the plenum up BUT....lol lol

I may go back and use the F piece and try to make it to work that way though I guess you could "grind" off a little aluminum right there for extra clearance ....IDK...

Good Luck ~ :thumbup
 
#6 ·
Funny thing is I'm waiting for my wife to go into labor so we have to goto Springfield (nearest hospital), just so I can goto Harbor Freight and get one. Is that wrong? hahaha
 
#10 ·
No it wont because the same amount of vacuum is supplied from the rear port in the plenum. The only reason we do this is because the stock PCV vacuum location dumps everything from the PCV into the last 2 cylinders. The new location spreads the oil and such across all the cylinders.
 
#12 ·
Apparently it'd make you horny. Look how many chinese people there are... :haha
 
#16 ·
Nothing; that would work fine as well. Just be sure to cap the original PCV vacuum port on the back of the plenum.
 
#18 ·
The TSB says its 3/8 inch pipe thread, but I haven't checked on mine. Be sure to use Teflon tape.
 
#25 ·
I dunno, lemme look up a I6 intake and see where the PCV inlet is, but I doubt it'll need to be done.

Edit: Just checked and it does not need to be rerouted on an I6, just make sure you replace the PCV when needed.

Jhowson69 said:
very nice writeup. but i saved some time and bought a breather!
Click to expand...
Thanks, but I don't see how a breather would work, or at least work anywhere near like a PCV system does. The engine vacuum sucks the oil\water\whatever from the engine itself. A breather just sits there and filters whatever comes out\goes in. The only was a breather would even remotely work would be if you have excessive amounts of blow-by...which is a VERY bad thing in itself.
 
#27 ·
PCV has nothing to do with cats or emissions. It helps keep the oil cleaner by having the water\thinner oil\dirt sucked out of the crank case. Your breather doesn't do that unless you have a bunch of blow by. There's a link that shows how the PCV system works but I'm at work right now so I'll find it later and post it.
 
J
#28 ·
let me explain why i said that. i understand the pvc valve one of its purposes is to reuse the partially burned crankcase gas and send it back to be mixed in the cylinder to eliminate crankcase emissions where as pre pcv valve days there was simply a tube letting it go into the atmosphere. I mentioned cats and emissions to state that i was not worried about emissions. I know it has a few more such as less moisture due to constant circulation. but sorry bud i should have stated it clearly and didnt mean to jack your thread.
 
#29 ·
I got this knocked out today, thanks for the post. Question though, How should we use seafoam now? is this reroute going to change from running it into the brake booster line ?
 
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#32 ·
Nope, you're good. Your truck must have been built after this TSB was produced.
 
#34 ·
You know whats funny I had bought a (new to me) upper plenum off ebay when I was doing head work and on my 96 there was no hole in the back of the plenum but there was a hole in the back of the one I had bought off ebay I plugged it up I cant remember what with though I cant remember if it was an actual bolt, now that i look at a picture i took it is not a bolt at all it is a threaded liquid end (or what ever you call it) Im a jackass. with this having an opening would it cause bad milage or oil leaks?
Image

Newer FI on right (silver) older on left (black) the reason i switched them in the first place was because I had broke the plenum flange trying to get that POS bolt threw in the middle
 
#35 ·
Well its a vacuum leak, so youd get all the consequences of a vacuum leak with it.
 
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