1997 Expy 5.4 PCV Valve to Where?

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Hi,
1997 Expy 5.4 1st Gen
The PCV valve vacuum hose has presented me with a problem. I just finished replacing the plugs on the passenger side and was putting wires and hoses back on when I got to the PCV valve. I pushed the vacuum hose back on the PCV valve at the valve cover but the other end of the hose appeared to be ducktaped to a funny looking plastic pipe right at the firewall that goes to what looks like some kind of regulator. What the heck?
I don't have a diagram at hand. I'll attach pics.
Anybody know?

 

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1st pic shows PCV hose attached to PCV.

2nd pic shows the deteriorated rubber boot on the other end of the PCV hose.

3rd pic shows the metal manifold vacuum fitting on the manifold.

4th pic shows the plastic tube that the disintegrating PCV hose was ducktaped to (tube coming from the unknown unit at the back of the intake manifold).

 

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pic 4:
The deteriorated rubber end of the PCV hose appeared to have been stuffed into that tube and ducktaped.
Strange but true. What the?

 

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Am I all alone on this thread?

 

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The homemade fitting was the rotted rubber boot (just like jelly) of the PCV hose stuffed into the clear tubing that was on the metal vacuum fitting at the back of the intake manifold.
Amazing contraption; it was still able to run well but was not breathing. I suspect it caused a lot of pressure, and sludge to collect inside the engine, and probably is the reason for oil seeping from the valve cover gaskets etc..
People don't give the PCV system enough respect.

 

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... but I forget what came off of the vacuum fitting under the throttle body area (visible in the 3rd pic)?? I can't find anything that lives there.

 

[Hamfisted]

You can still find the OEM assembly on Amazon. 97-98 Ford 5.4L PCV Hose Assembly on Amazon

 

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I decided to build a PCV hose out of the old one. You can see I put a smaller hose inside the 5/8 hose which fits the fitting on the back of the intake manifold.
I then fit a plastic PVC valve elbow I had in my stuff into the 2 hose piece. Then fit a little larger diameter hose over the fat end of the elbow. The original black tube then fits tight into that hose.
I used a heat gun and some spray to make assembly easier.
Voila.
I put a rubber plug over the 'mystery' vacuum fitting at the base of the throttle body. All I can think of is it is used with a heated PCV configuration. The original plug may have gotten knocked off when I was wrestling with the plugs and COP coils?

 

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I

You can still find the OEM assembly on Amazon. 97-98 Ford 5.4L PCV Hose Assembly on Amazon

I don't have time to wait for new hose but thanks for that.
The mystery remains... What is that vacuum fitting used for?

 

[Hamfisted]

Some of the 5.4 motors that had the engine cold weather package used that nipple as a secondary vacuum source for the PCV system. You can plug it if you're not going to use it. The main vacuum source is the larger nipple on the back of the intake manifold.




If your vehicle had come with the cold weather package it would've used this tube assembly.... Ford F85Z-6C324-AA










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Some of the 5.4 motors that had the engine cold weather package used that nipple as a secondary vacuum source for the PCV system. You can plug it if you're not going to use it. The main vacuum source is the larger nipple on the back of the intake manifold.




If your vehicle had come with the cold weather package it would've used this tube assembly.... Ford F85Z-6C324-AA

View attachment 70321








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EXCELLENT! Thanks Hamfisted! You varified my suspicion. The 'cold weather' PCV package is what I was calling the heated PCV config. I suppose I could put that cold weather hose on there? Calgary gets cold enough for that I bet
Thanks again.
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... Or is there more to the cold weather pvc system than simply changing to the double pcv hose config?

 

[Hamfisted]

There's some hot water plumbing that runs from the heater hose to the PVC valve. It's a complete waste, and just another item to fail under the hood. Nobody needs it except the federal government.

 

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There's some hot water plumbing that runs from the heater hose to the PVC valve. It's a complete waste, and just another item to fail under the hood. Nobody needs it except the federal government.

I get it. Thanks for that. Government is a 10 letter word
Thanks Hamfisted