Greetings all. I am trying to figure out what this extra, closed off vacuum port is on my truck..? I have a 2004 5.4 xcab and near the rear of the engine compartment, on the pass side, there is a strange shaped (a few right angles) red vacuum hose that isnt connected to anything and looks to be factory plugged. Does this goto / come from the main vac? What is its purpose?

I apologize if this has been answered before.

Thanks tons!

 

I'd have to see it...My 08 doesn't have such an animal on it.

 

Is your truck A 4X4 ?

 

Pics would be helpful.

 

I believe this is what the OP is talking about. I've got it on my '04 5.4 Scab as well:

 

i have the same thing on my 4.6 too.s-cab 2wd.

 

That vacuum line is for 4 wheel drive system It connects to a part that is on the passanger side right next to the pcm

 

Yes!! That is it!

Sorry about not posting pics - no mine isnt a 4x4

Its for a 4x4? Sweet! Now all I need are the rest of the part! hehe..and tires.

I tried to follow it back and think it plugs into the main vac WAAAAY in the back of the engine... sheesh.

Bug

 

It will cost a few bucks to convert your 2 wheel drive to a 4 wheel drive That vacuum line is not a PLUG & PLAY ITEM

 

Lol!

Hey.. its a nice start, and since it's already there and paid for..it will save me money