Chrysler Conquest 1988 Service Manual page 678

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25-6
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EMISSION CONTROL SYSTEMS - General information
To purge
control valve
Injection
mixer
Thermo sensor
GEMOK
) To overflll limiter
From fuel tank
WE5 1 I
?ellef valve
/c-r==?
F
ket
THERM0 VALVE
NZlHBFA
The therm0 valve, for sensing the engine coolant temperature
at the intake manifold, closes the purge control valve when the -
engine coolant temperature is lower than the pre-set value in mm
order to reduce G!!and HC e_missions under eggine~warm-up I,
conditions, and opens the purge control valve when
the
engine
~
coolant temperature is above_ the pre-set temperature.
-
FUEL CHECK VALVE
N25HBGA
The fuel check valve is used to prevent fuel leaks, should the
car suddenly roll over. This~vaEe is connected in the fuel vapor
line (between fua tank and oyerfill limiter) and is insTalled on
the fuel tank.
The fuel check valve contains two balls as show.0 in the .I
illustration. Under normal conditions, the gasoline vapor pas-
sage in the valve is opened, but if roll-over occurs one of the I
balls closes the fuel passage, thus preventing fuel leaks.
FUEL FILLER CAP
N25HBHA
Fuel filler cap is~ equipped
tiith
relief valve to prevent the _
escape of fuel vapor into the atmosphere.
= EXHAUST EMISSION CONTROL SYSTEM
N25HCAC
Exhaust emlsslorrs (CO, HC, NJx) are controlled by a combrna- ~~
tlon ot engine mudificatlons and the addition
at
special control
02mponents. ~_
Modifications to.. the combu&on chamber. Intake manifold, ;
camshatt, carburetor and ignltron system torm the basic control
system.
AddItional control devices include a jet air system, an exhaust
qas recrrculatlon (tGR) system, dual catalytic converters, a
secondary ait- supply system,-a dash pot, a heated atr intake I
system and hig h altitude compensation system.
These systems -have been Integrated Into a highly effective L
system whrch controls exhaust emlssrons while majntaining -
good dnveability and fuel economy.