How to Solve Black Smoke from Diesel Vehicles?

1 Answers
Norah
07/29/25 8:05pm
Diesel vehicles emitting black smoke require inspection or replacement of the air filter, cleaning of the fuel system or adding fuel cleaner, and checking the fuel injectors. The following are the causes of black smoke from diesel vehicles: 1. Dirty air filter: Remove the air filter and observe the exhaust smoke color. If the black smoke condition improves, it is caused by severe dirtiness of the air filter; 2. Excessive fuel supply in a cylinder: During engine operation, conduct a cylinder-by-cylinder fuel cut-off test. When a cylinder is cut off, the engine speed decreases, black smoke significantly reduces, and knocking sound weakens or disappears, indicating excessive fuel supply in that cylinder.
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