What Causes Excessive Vehicle Exhaust Emissions?

[PenelopeFitz]

Excessive vehicle exhaust emissions can be attributed to the following reasons: Abnormal engine operation: The engine may experience issues such as cylinder misfire, spark plug oil leakage, or oil blow-by. When the throttle is increased, the engine runs unevenly and lacks power. Dirty vehicle three major systems: This situation usually occurs when the vehicle is relatively new, but the test results show excessive emissions, or the excess is minor (just a few percent or fractions of a percent). This indicates that the vehicle's exhaust treatment system (including the three-way catalytic converter and oxygen sensor) is not significantly faulty. The cause of excessive emissions may be due to the three major systems (intake system, exhaust system, and fuel system) being excessively dirty. Three-way catalytic converter failure: Three-way catalytic converter failure is the primary cause of excessive vehicle exhaust emissions. The three-way catalytic converter is the most important external purification device installed in the vehicle's exhaust system. It converts harmful gases such as CO, HC, and NOx emitted by the vehicle into harmless carbon dioxide, water, and nitrogen through oxidation and reduction reactions.