sudden loss of boost?

[h100vw]

What about the airflow through the ports, it will be different in the 2 positions. Google a diagram of the guts of the N75 and see what happens.
Gavin

[Anth1223331]

What about the airflow through the ports, it will be different in the 2 positions. Google a diagram of the guts of the N75 and see what happens.
Gavin

Well just tried it then, valve is holding pressure in the nipple that is closed. When switch opened, other nipple holds pressure. The ones that you can blow through flow easily turned off and on... (hopefully that makes sense) So something else must be the cause of the problem?
Thanks heaps for your help.

EDIT: Cleaned MAF pretty well with a can of electrical contact cleaner last night and left it to dry till this morning, didn't change anything, still cant get past 6-7psi.