There's some sort of breather hose that is mean to connect to a small flared
outlet on the top of the front diff on my '87 California Syncro. Being a
flared outlet, it looks like it's supposed to be a pressure-tight seal or
some such. My hose is badly damaged and won't form a seal on this, so I
shall be replacing it this weekend. I found it this way when I swapped out
my Viscous Coupling for a rebuilt Weddle Unit. (The VC gets a thumbs up. The
new unit is just fine around town, and has already proven its lock-up
capability off-road)

So my question is, where does this hose go?

My big fear is that it joins the rest of the emissions system (Fuel vapour
and maybe the transmission breather) which then joins into the throttle
body. If this is the case then I need to fix it PRONTO, since I'd be sucking
air in past the airflow meter and idle valve, and only have the Oxygen
sensor to compensate for any anomalies. And I do have a strange
just-off-idle hesitation that hasn't been solved by replacing all the
wearing parts (Cap, rotor, leads, plugs, O2 sensor), doing the Cap fix on
the AFM and moving the guts of the AFM sensor around to make new tracks.

Does anybody know if this is the case?

Luke Plaizier