Hi, I'm looking for leaks in the intake manifold. Bentley's doesn't give
a procedure for checking intake manifold vacuum so I'm winging it. I let
the engine warm up so that aux air regulator thing is closed, and then I
  pulled one of the hoses going to the vacuum unit on the dizzie and
connected it to my fine Harbor Freight vacuum gauge.

This is a 1.9L engine and the hose I'm using is the hose labeled "2" on
the left hand photo on page 24.25 in Bentleys.I don't know how
appropriate this hose is, but it has fewer bits connected to it than the
other one. There's also a hose going to the fuel pressure regulator,
maybe it's a better choice?

ANYWAYS, when the hose is disconnected from the vacuum unit, the idle
hunts up and down. The vacuum gauge shows around 18psi -- depending on
engine rpms. I can open the throttle and the vacuum might drop to 10psi,
then climb back up . . . I really have no idea how one goes about
measuring vacuum.

--

Mike "Rocket J Squirrel" Elliott
71 Type 2: the Wonderbus
84 Westfalia: Mellow Yellow ("The Electrical Banana")
74 Utility Trailer. Ladybug Trailer, Inc., San Juan Capistrano
KG6RCR