Does anybody know what this hose is

[Docflo79]

Hi, I removed the intake manifold and I found a hose back by the firewall that is capped off with what looks like one of those plastic push retainers that usually hold plastic/rubber panels and stuff. Does anybody know what it is? If its supposed to be capped off? Thanks
05 explorer eddie v8 4.6

 

[kydirtscooter]

That is in the same location as my transmission vent tube. It should not be plugged, but usually they have a clip and the hose turns back towards itself. Where does it end up plugging into?

Are you doing intake manifold and if so, is it original?

 

[BrooklynBay]

Check the vacuum diagram under the hood. It could be the DPFE sensor.

 

[kydirtscooter]

The DPFE was integrated into the EGR valve block with the move to CAN Bus in the 04 MY for the 4.6. 02-03 had a different EGR setup with the DPFE sensor and EGR valve block being two separate entities.

The 02-03 setup would have two stubby hoses coming off the small tubes running to the main EGR pipe.

The 04-05 setup only has the main pipe no hoses or small tubes.

 

[kydirtscooter]

Is there a chance you can snap a pic of one of the intake ports showing carbon buildup and the corresponding intake valve? I am curious on buildup of carbon.