What does it mean when the exhaust pipe emits black smoke?
2 Answers
Reasons for the car engine light flashing: 1. Excessive carbon deposits: Too much carbon buildup in the throttle or inside the engine. 2. Imbalanced air-fuel mixture: Malfunction of the oxygen sensor leading to an imbalanced air-fuel mixture. This phenomenon often occurs when driving at low speeds in urban areas for extended periods. 3. Fuel injector leakage: Leakage in the fuel injector causes it to continue supplying fuel even after releasing the accelerator, resulting in an overly rich mixture during low-speed driving and unstable idle speed after releasing the accelerator. In severe cases, the engine may stall directly. 4. Oxygen sensor poisoning: Using low-quality gasoline with excessive metal content, which poisons the oxygen sensor. The solution is to switch to a different gas station.
I've seen black smoke coming from the exhaust pipe many times, which is usually caused by incomplete combustion of gasoline. The most common reasons include fuel injectors leaking and spraying too much gasoline with insufficient air intake, resulting in a rich fuel mixture; or a clogged air filter with excessive dust; aging spark plugs with weak ignition may also prevent fuel from burning properly. If the oxygen sensor fails, the engine computer can't adjust the mixture ratio correctly. Black smoke not only wastes fuel but also accelerates engine wear. Long-term neglect may even damage the catalytic converter. It's recommended to first check if the air filter is dirty and replace it if necessary, and inspect the spark plugs for carbon buildup. If the problem persists, take your car to a repair shop immediately to scan for trouble codes. Avoid driving on highways to prevent breakdowns. These small actions can save you money and hassle.
