What causes black smoke from an electronically controlled diesel engine?

[Kara]

Electronically controlled diesel engines emit black smoke due to the following reasons: Issues with the diesel fuel itself: Using the wrong grade of diesel fuel, excessive viscosity, or poor-quality diesel that is difficult to ignite can cause black smoke emissions. Additionally, this can lead to carbon buildup in the combustion chamber and exhaust muffler. Solution: Use the appropriate and standard-grade diesel fuel. Excessive intake valve clearance: Excessive clearance in the intake and exhaust valves reduces valve lift. Alternatively, loose, worn, or deformed parts in the valve train, or misalignment between the camshaft gear and crankshaft timing gear can result in incorrect valve timing, leading to insufficient fresh air in the cylinders and black smoke during acceleration. Solution: Inspect the valve clearance, valve springs, and valve sealing. Uneven fuel supply: Uneven or excessive fuel supply from the high-pressure fuel pump to each cylinder can cause unstable engine speed and intermittent black smoke emissions. Solution: Adjust the fuel supply from the high-pressure fuel pump to each cylinder to ensure balance or within specified limits.