The combustion reaction caused by the catalyst
releases additional heat in the exhaust system, caus-
ing temperature increases in the area of the reactor
under severe operating conditions. Such conditions
can exist when the engine misfires or otherwise does
not operate at peak efficiency. Do not remove spark
plug wires from plugs or by any other means short
out cylinders, if exhaust system is equipped with a
catalytic converter. Failure of the catalytic converter
can occur due to temperature increases caused by
unburned fuel passing through the converter. This
deterioration of the catalyst core can result in exces-
sively high emission levels, noise complaints, and
exhaust restrictions.
The use of catalysts also involves some non-auto-
motive problems. Unleaded gasoline must be used to
avoid poisoning the catalyst core. Do not allow engine
to operate above 1200 RPM in neutral for extended
periods over 5 minutes. This condition may result in
excessive exhaust system/floor pan temperatures
because of no air movement under the vehicle.
CAUTION: Due to exterior physical similarities of
some catalytic converters with pipe assemblies,
extreme care should be taken with replacement
parts. There are internal converter differences
required in some parts of the country (particularly
vehicles built for States with strict emission
requirements).
Fig. 1 Exhaust System
1 – V-BAND CLAMPS
2 – BAND CLAMPS
3 – FRONT RESONATOR
4 – EXHAUST MODULE: INTERMEDIATE PIPE
5 – MUFFLER
6 – BAND CLAMP
7 – REAR RESONATOR/PIPE ASSEMBLY
8 – CATALYTIC CONVERTERS
Fig. 2 Catalytic Converters
1 – V-BAND CLAMPS
2 – BAND CLAMP
3 – EXTENSION PIPE
4 – CATALYTIC CONVERTERS
11 - 2 EXHAUST SYSTEM LH
DESCRIPTION AND OPERATION (Continued)
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