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Fuel Emission and Exhaust System
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DECELERATION CONTROL
DESCRIPTION AND OPERATION
During deceleration, a high manifold vacuum is
created behind the closed throttle plates and lean
condition occurs due to the loss of air flow through
the air flow sensor. To eliminate this lean condition
which causes high hydrocarbon emissions, a by-
pass valve is located in each throttle plate.
The by-pass valves open when the manifold
vacuum is above the normal idling vacuum. This
allows enough air flow to by-pass the throttle
plates and permit continued fuel injection. Fig. 45.
ENGINE
Fig. 45 ;
-AIR
Bypass valve
Throttle plate
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