What Causes a Diesel Engine to Emit Black Smoke When Accelerating?

[LaEverly]

Diesel engine emitting black smoke when accelerating can be caused by the following reasons: 1. Clogged air filter. 2. Fuel injector dripping instead of spraying. 3. Ignition timing issues, generally with minimal impact from spark; early fuel supply timing results in crisp sound and blue smoke, while late timing causes rough running or backfiring with white smoke. 4. Problems with the fuel pump, insufficient plunger pressure. 5. Loose screws on the vacuum tube connecting the turbocharger to the fuel pump, or loose tubes on the turbocharger's intake side. 6. Check if the engine is air-cooled; a dirty air-cooling system can also lead to lack of power and black smoke. Solution: Adjust the fuel injection advance angle, which can be resolved by contacting their after-sales service department.