Granada L4-140 2.3L VIN A 2-bbl (1982)
system to intake manifold are blocked by a valve which is opened by vacuum and closed by spring pressure.
Fig. 42 EGR valve with integral back pressure transducer
Two types of back pressure valves are used. The integral back pressure transducer valve, Fig. 42, cannot be opened by vacuum until the bleed hole
is closed by exhaust back pressure. When open, the valve oscillates at a level dependent on the exhaust back pressure flowing through the orifice.
Valve opening increases as signal vacuum and exhaust back pressure increases.
Fig. 43 EGR valve with remote back pressure transducer
Some vehicles use an EGR valve with a remote back pressure transducer, Fig. 43. This assembly operates the same as the EGR valve with integral
back pressure transducer valve and is serviced only as an assembly.
