B Series Truck 2WD L4-2184cc 2.2L 2200 2-bbl (1990)
Catalytic Converter: Description and Operation
Carbureted
Exhaust System
To reduce CO, HC, and NOx emissions, two three way catalytic converters are used on these vehicles. The first catalytic converter oxidizes CO and
HC and reduces NOx by a chemical reaction. The active materials in the front converter are platinum and rhodium and it has a volume of 1100 cc (67.1
ci). The second catalytic converter is an oxidizing converter. The active material in the second converter is palladium and it has a volume of 1600 cc
(97.6 ci).
If the fuel system maintains an optimum air fuel ratio, with oxidation of CO content and HC, the catalytic converter reduces the emission of NOx. The
exhaust emitted by the car to the atmosphere consists mainly of CO2, H2O, and pure nitrogen.
