Ford VSG-411 Service Manual page 70

03A-6 Emission Control System 03A-6
DESCRIPTION AND OPERATION (Continued)
COLD ENGINE WARM ENGINE
O-RING IS HELD
SEATED TO BLOCK
" 9 PORT CONNECTED
TO VACUUM SOUF
TEM
WHEN ENGINE WARMS, SENSOR
EXPANDS TO PUSH PLUNGER UP
FLOW
IH VALVE
The two-port PVS senses engine coolant temperature so
that it can cut off vacuum to the EGR valve when the
engine is cold, and connect vacuum to the EGR valve
when the engine is warm.
Crankcase Emission Control System
The Crankcase Emission Control System consists of an oil
filler cap (including PCV valve) with two connecting hoses,
one of which passes to the inlet manifold and the other to
the air cleaner. The result is a closed ventilation system in
which the fumes from the crankcase pass back via the inlet
manifold into the cylinders for combustion.