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520i L-JETRONIC pressure switch. What does it do?
Posted: Mar 25, 2025 12:45 PM
by 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.
Re: 520i L-JETRONIC pressure switch. What does it do?
Posted: Mar 25, 2025 5:29 PM
by 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)
Re: 520i L-JETRONIC pressure switch. What does it do?
Posted: Mar 26, 2025 11:40 AM
by 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
Re: 520i L-JETRONIC pressure switch. What does it do?
Posted: Apr 01, 2025 9:47 AM
by Federico
This sheet from the service manual calls it a "partial load switch". Maybe you could test it by applying vaccum and checking for continuity changes.
This is clearly a BMW add on to the basic L-Jet, so the answers are probably in one of these tech bulletins:
