[Daithimac]

BLack hose behind air inlet manifold ,it goes to a t junction .Then one black tube goes back into engine blaoc other goes into a cream coloured "plug" could be a sensor ,but no electrical connector there. 1.6 V zetec engine '99
No. on tube is 96MF-6C342-CBC72GA..Any one any idea what this pipe does .

 

[iminhell]

How big is the tube?

Sounds like it would have to do with the PCV or breather system.