520i L-JETRONIC pressure switch. What does it do?

[heminglopez]

I have been trying to find out what the pressure switch 13621287760 purpose is, on my 520i  L-JETRONIC. 
Its does not do any difference when i unplug the connector, or remove the vaccum from the manifold.
Will someone please explain, thanks.
 

[Aldo525]

Not 100% sure but earlier M20 engine have a "gases emision control" system, see the link

https://www.bimmerforums.com/forum/show ... r-(M20B23)

 

[heminglopez]

Well it could be, its just weird that something like that is not mentioned at all anywere.
Its not a cheap part, so i was hoping it might do something

Thanks for the reply