Chrysler Conquest 1988 Service Manual page 681

EMISSION CONTROL SYSTEMS
- General Information
25-9
Stoichiometric ratio
01251:
SECONDARY AIR SUPPLY SYSTEM
Control relay
6--
Function
The three-way catalytic converter removes CO, HC and NQx
most effectively in the vicinity of the stoichiometric ratio. '
The air-fuel ratio feedback control by' the oxygen sensor
controls the air-fuel mixture to the stoichiometric ratio and the
catalytic converter promotes both oxidation and reduction of
resultant exhaust gas to make it clean before it is released to
atmosphere.
Caution
The catalytic converters require the use of unleaded
gasoline only. Leaded gasoline will destroy the effective-
ness of the catalysts as an emission control device.
Under normal operating conditions, the catalytic convert-
ers will not require maintenance. However, it is important
to keep the engine properly tuned. If the engine is not kept
properly tuned, engine misfiring may cause overheating of
the catalysts. This may cause heat damage to the convert-
ers or vehicle components. This situation can also occur
during diagnostic testing if any spark plug cables are
removed and the engine is allowed to idle for a prolonged
period of time.
Fuel injector 1
-1
Secondary air
control solenoid
/
Secondary
air cleaner
Oxygen s"e;;gor
ISC motor
+@
F
ECU
Ii 1
perature sensor
II'
Ignition coil
Air flow sensor
TWC: Three-way catalytic converter
5EM059