What Causes Black Smoke from the Exhaust Pipe?

[Joe]

Black smoke from the exhaust pipe indicates the following causes: 1. The presence of excessive carbon particles in the exhaust due to incomplete fuel combustion, primarily caused by an overly rich fuel-air mixture; 2. A clogged air filter or a faulty air flow meter; 3. Poor atomization of the fuel injector—check the fuel quality; 4. Cylinder pressure leakage or excessive carbon buildup on the valves or in the combustion chamber. Solutions for black smoke from the exhaust pipe include: 1. Regularly inspect the sealing of the cylinder block, pistons, and other components in older vehicles. If black smoke is detected, promptly visit a repair shop to prevent further damage; 2. Ensure the proper amount of engine oil is added and regularly monitor its condition. If abnormal oil consumption is observed, immediately seek inspection at a professional repair shop.