D21 Hardbody 2WD L4-2389cc 2.4L SOHC (Z24i) (1988)
Catalytic Converter: Description and Operation
Three Stage Converter
The three way catalytic converter utilizes a catalyst to accelerate the recombustion of HC and CO and a catalyst to reduce NOx in the exhaust gas,
changing them into harmless CO2, H2O, and N2.
A mixture ratio feedback system maintains mixture ratios at the "stoichiometric" point--the point at which the converter works most efficiently.
In this system, an exhaust gas sensor monitors oxygen content in the exhaust and signals the ECU to alter the air/fuel mixture--maintaining the
"stoichiometric" level.