What Causes Excessive NO in Vehicle Exhaust?
1 Answers
There are many factors that can lead to excessive vehicle exhaust emissions, and specific inspections are required to confirm the exact cause. Excessive NO is primarily caused by poor combustion leading to an overly rich air-fuel mixture. It is necessary to check components such as spark plugs, fuel injectors, and high-voltage wires. Generally, it is recommended to clean the engine carbon deposits, the three-way catalytic converter, and the oxygen sensor before an emissions test to effectively reduce emissions. Below is an introduction to the causes of excessive vehicle exhaust emissions: Aging of vehicle components: This mainly applies to older vehicles, as prolonged use leads to aging of various parts. Owners can often clearly notice a significant decline in performance, and the vehicle's exhaust emissions are noticeably worse than before. Additionally, due to advancements in production technology and stricter emission standards, older vehicles that once met production standards may now easily exceed emission limits. Use of low-quality fuel: Fuel quality also has a certain impact on vehicle exhaust emissions. Imported vehicles, especially high-end models, often require higher fuel quality. However, fuel quality in some domestic regions, particularly remote areas, frequently fails to meet the required standards. Long-term use of low-quality fuel can easily lead to excessive emissions, resulting in failure during the annual vehicle inspection.
