Black smoke: Fuel that has been baked into soot and discharged.
• Black smoke is often referred to as just “smoke”. Black smoke is generated when the injected fuel is poor in oxygen. As the fuel is exposed to high temperatures, thermal breakdown occurs, leaving carbon behind. Black smoke occurs when the injected fuel quantity is too large, or when the air-fuel mixture is rich due to an insufficient quantity of air.
Source of Black Smoke
1 Large Fuel Injection Quantity, Air-fuel mixture becomes rich.
2 Low Intake Air Quantity, Air quantity is insufficient due to air filter clogging.
3 Poor Fuel Atomization, The ratio of fuel to air worsens.
4 Retarded Fuel Injection Timing, Air-fuel mixing time is insufficient.
