Hope this helps, can't remember where I cut and pasted from. I have had zilcho luck on finding a good diagram.
VACUM SYSTEM consists of four different vacuum harnesses.
1) On upper intake manifold on the front side near the bottom there
is a fitting screwed in with a hose barb facing the pass side. This
is the main vac harness.Soft straight connnector goes to hard line
that makes a 90° turn towards back of engine. Connects to a rubber
T that branches off to
drivers side and back of motor. A two port check valve on drivers
side brach and a three port check valve towards back of motor.
Drivers side brach turns to hard line that goes to EGR solenoid
on drivers side of motor and then from the solenoid turns to hard
line back to EGR valve. Three way branch goes two ways. Towards
back of motor it goes to a T with one branch to small hard line that
goes thru fire wall to HVAC controls and other branch to soft line
that goes all the way to front pass corner of engine compartment under
battery tray for vacuum reserve ball. Other side of three way check
valve runs to soft line that goes towards drivers side of motor to
the cruise control vac canister.
2) On the back of the upper intake manifold near the top, there is a
fitting that is screwed in with a barb that faces down. Rubber line
to a rubber T that branches off to plastic line with one line going
to the map sensor (drivers side of motor) and one line going to fpr
(pass side of motor).
3) Off the drivers side of the intake manifold near the top. Large
fitting with large vacuum hose that goes to the brake booster. This
is where people have been getting boost source for boost gauges.
(install kit available from RonG @ APE)
4) Off the bottom front of the throttle body. hose barb going straight
down. 90° rubber fitting to hard plastic U to check valve to rubber
line running past alternator to front drivers side of motor for the
EVAP system.
Cody
My email is tommyquest73@netzero.net
