Grand Caravan FWD V6-3.3L VIN 3 Flex Fuel (2002)
storage can be used as an indicator of catalyst performance. Refer to the appropriate Diagnostic Information for diagnosis of a catalyst related
Diagnostic Trouble Code (DTC).
The combustion reaction caused by the catalyst releases additional heat in the exhaust system, causing 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 excessively high emission levels, noise complaints, and exhaust restrictions.
The use of catalysts also involves some non-automotive 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.
The flex joint allows flexing as the engine moves, preventing breakage that could occur from the back-and-forth motion of a transverse mounted
engine.
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) and between model years.
