If the exhaust emits black smoke, it indicates an overly rich fuel mixture, which is a sign of incomplete combustion; if the exhaust emits white smoke, it means there is a small amount of water in the cylinders that turns into white vapor after combustion and is expelled; if the exhaust emits blue smoke, it is a sign of burning engine oil. White Smoke from the Car: When starting the car or driving, a large amount of white smoke appears from the exhaust, and the engine runs less smoothly. Even when the engine reaches its preheating temperature, a significant amount of white smoke may still be visible. The cause of white smoke could be wear in the engine cylinder head gasket, creating a gap that allows coolant from the cooling system to enter the combustion chamber in large quantities. Since water cannot burn, it turns into steam when heated and is directly expelled through the exhaust pipe. Black Smoke from the Car: Symptoms include weak acceleration, significant engine shaking, abnormal sounds from the exhaust pipe, and black smoke emission. Black smoke is more commonly seen in carburetor-equipped vehicles because the fuel injection in such cars is not controlled by a computer but by the throttle pedal. In some cases, excessive fuel enters the cylinders and is expelled before it can fully combust, resulting in visible black smoke. Blue Smoke from the Car: When driving, the car feels sluggish during acceleration and lacks power. The engine noise increases, and the exhaust pipe frequently emits blue smoke accompanied by a burnt smell from burning engine oil. This is usually due to internal engine issues. Blue smoke occurs when engine oil enters the combustion chamber, possibly due to scratches, poor piston sealing, or severe wear in the valve area.
