Why Does Vehicle Exhaust Exceed Standards?

[EverlyDella]

Here is an introduction about excessive vehicle exhaust: 1. Vehicle aging: If a car has traveled more than 450,000 kilometers or been in use for over 15 years, its components will exhibit significant aging, poor contact, weak sealing, and insufficient pressure. 2. Failure of the catalytic converter: The malfunction of the catalytic converter is the primary reason for excessive vehicle exhaust. The catalytic converter, installed in the vehicle's exhaust system as the most crucial external purification device, transforms harmful gases such as CO, HC, and NOx emitted from the vehicle exhaust into harmless carbon dioxide, water, and nitrogen through oxidation and reduction reactions. When high-temperature exhaust passes through the purification device, the catalyst in the converter enhances the activity of CO, HC, and NOx, promoting specific oxidation-reduction chemical reactions. CO oxidizes at high temperatures into colorless, non-toxic CO2 gas; HC compounds oxidize into water (H2O) and CO2; and NOx reduces into nitrogen and oxygen. These three harmful gases are converted into harmless ones, thereby purifying the vehicle exhaust. 3. Abnormal engine operation: The engine may experience misfiring, spark plug oil leakage, or oil mixing. When accelerating, the engine does not run smoothly and powerfully.