What are the symptoms of a car without a catalytic converter?

[DiLaila]

The symptoms of a car without a catalytic converter are: shortly after the vehicle starts, a noticeable red burning phenomenon occurs from the exhaust manifold to the catalytic converter, and a hissing sound of air leakage and gurgling noise can be heard when accelerating. Below is relevant information about automotive catalytic converters: 1. Working principle: When high-temperature exhaust gases pass through the purification device, the purifying agent in the catalytic converter enhances the activity of CO, HC, and NOx gases, promoting certain oxidation-reduction chemical reactions. CO oxidizes into colorless, non-toxic carbon dioxide gas at high temperatures. HC compounds oxidize into water (H2O) and carbon dioxide. NOx is reduced into nitrogen and oxygen. These three harmful gases are converted into harmless gases, thereby purifying the vehicle's exhaust. 2. Inspection method: Check whether the catalytic converter is damaged or overheated during driving. After lifting the vehicle, observe the surface of the catalytic converter for dents. If there are obvious indentations or scratches, it indicates that the carrier of the catalytic converter may be damaged.