Is It Normal to See Black Smoke When Accelerating Hard?

[VonLucy]

Seeing black smoke when accelerating hard is not normal. The possible causes and inspection methods are as follows: Overly Rich Air-Fuel Mixture: Check if the oxygen sensor has failed. If the oxygen sensor fails, the vehicle loses its ability to automatically adjust the fuel injection volume, making it easy to produce black smoke when accelerating hard. Excessive Fuel Impurities: If low-quality fuel is used, gasoline will produce many impurities after combustion. Decreased or Failed Spark Plug Performance: Spark plugs are components that ignite the combustible mixture. If the spark plugs age, they cannot effectively ignite the gasoline, leading to incomplete combustion. In this case, the only solution is to replace the spark plugs.