Check eng. lt. shows P0172 code. After going through all the threads I'm looking for a vacuum leak or disconnect. The Haynes manual is useless for any vacuum info. and I do have the small diagram under the hood. I'm not sure I'm able to trace these lines 100%. Does anyone know of any pictures or other diagrams showing exactly how many vac connections there are and where they are located? The elbows I have found drop black powder when pinched but not sure that would cause the fault. 96 850 glt 93k NON TURBO. Runs great. I didn't want to change out sensors just yet,cheap way first.

 

Haynes is Quite useless for that I am afraid. I wish I had saved it, but when I was reconnecting all of mine, I wound up googling 96 850 vacuum diagram under the pictures link then used several pictures to get the best understanding of it all. One vacuum conection that is somewhat elusive is the one that is part of the PCV system that starts out under the intake manifold on the passenger side. This connection isnt readily visible and the tubing runs well out of sight beneath the manifold to connect on the opposite side to a connector on the flame trap located behind the throttle body. again this is the least obvious connection and you should be very careful not to accidentally disconnect it if you inspect it. Most other connections are quite visible and obvious to my recollection.