VVIS vacuum resevior location?

Gasman81 · Post by **Gasman81** » 02 Nov 2010, 00:37

Hi Guys, I'm new on here. I have had my handed down '94 850 sedan for a while and upon fixing up another '94 850 wagon and tracing my vacuum diagram in my sedan for the 5th time came across the VVIS system. I have had a vacuum line coming up from under the intake manifold behind the EGR valve for a while with nowhere to connect to up top. Now I know, I can't seem to locate where the vacuum resevoir is located.

Thanks

Volgrrr · Post by **Volgrrr** » 02 Nov 2010, 01:16

The 'reservoir' you talk about is actually the engine i.e. when it is running the induction process within the engines 4 stroke cycle creates a vacuum if it is in good condition.

The only vacuum 'reservoir' is at the rear of the maser brake cylinder and all it does is provide some boost to lessen the amount of pedal pressure the driver has to apply.

Gasman81 · Post by **Gasman81** » 02 Nov 2010, 16:05

Hi, thanks for the reply, I actually had a chance to look at another 850 today and followed the vacuum line. It goes down under the Drivers fender. The resevior is next to the secondary air pump. I guess I anserwered my own ?

It is my understanding that the engine does indeed provide vacuum, but behind a 1 way vacuum valve the vac hose goes from the soleniod to a vacuum resevior, on it's way there, it "Y"s off and that is where it connects to the intake tree with other vacuum lines.

Thank you again!