What Causes Black Smoke from Fuel-Injected Vehicles?
2 Answers
Black smoke from fuel-injected vehicles is caused by incomplete combustion due to uneven or excessive fuel supply to each cylinder or insufficient air intake. Below is relevant information about cylinders: 1. Introduction: A cylinder is the cylindrical chamber within an engine where a piston, driven by the pressure or expansion force of the working fluid, moves. Some special types of engines may have similar, but non-cylindrical parts. 2. Types: In pneumatic transmission, cylinders are pneumatic actuators that convert the pressure energy of compressed gas into mechanical energy. Cylinders can be categorized into two types: those performing reciprocating linear motion and those performing reciprocating swinging motion. Cylinders performing reciprocating linear motion can further be divided into four types: single-acting, double-acting, diaphragm-type, and impact cylinders.
My car also had black smoke coming out before, and the mechanic said it was caused by the air-fuel mixture being too rich. There are several common reasons: the air filter is clogged, affecting the air intake, so the engine doesn't get enough air; the fuel injector's seal is not tight or the atomization effect is poor, causing too much gasoline to be injected and not fully burned; a faulty oxygen sensor can mislead the engine control unit to inject more fuel; a malfunctioning fuel pressure regulator can cause abnormal fuel pressure to rise. Another easily overlooked issue is the coolant temperature sensor—if it sends the wrong signal, making the computer think the engine is cold, it will also inject more fuel. The most troublesome issue is with the ignition system—if a spark plug is worn out and one cylinder stops working, the gasoline is directly expelled as black smoke. In this case, it's recommended to get it repaired immediately, otherwise not only will fuel consumption skyrocket, but it could also damage the catalytic converter in the long run.
