Comanche 4WD L4-150 2.5L VIN P MFI (1991)
Conventional Oxidizing Catalytic (COC) Monolithic Type Converter
CONVENTIONAL OXIDIZING CATALYTIC (COC) MONOLITHIC TYPE CONVERTER
This type of converter changes carbon monoxide (CO) and hydrocarbon (HC) into water vapor (H2O) and carbon dioxide (CO2). The catalysts in the
converter which produce the chemical change is a mixture of platinum and palladium, coated to an extruded material resembling a honeycomb.
Dual Bed (TWC & COC) Monolithic Type Converter
DUAL BED (TWC & COC) MONOLITHIC TYPE CONVERTER
This type of converter is two converters in one container. The front half is a three-way catalytic (TWC) converter while the rear half is a conventional
oxidizing catalytic (COC) converter. The rear half of the converter has a provision for ``downstream'' air injection.
As with the three-way catalytic (TWC) converter, this converter must be used in conjunction with a feedback fuel delivery system in order to maintain
high efficiency.