OBJECTIVES. After studying Chapter 29, the reader will be able to: Prepare for ASE Engine Performance (A8) certification test content area “D” (Emission Control Systems). Describe the purpose and function of the catalytic converter.
After studying Chapter 29, the reader will be able to:
first separates the NOXinto nitrogen and oxygen and then converts the HC and CO into harmless water (H2O) and carbon dioxide (CO2).
A cutaway of three-way catalytic converter showing the air tube in the center of the reducing and oxidizing section of the converter. Note the small holes in the tube to distribute air from the AIR pump to the oxidizing rear section of the converter.
The waveform of an O2S downstream from a properly functioning converter shows little, if any, activity.
A partially melted catalytic converter that tested okay at idle but had excessive back pressure at idle speeds.