What Causes a Urea Vehicle to Emit Black Smoke?

[SanAriel]

Incomplete combustion of fuel injected into the cylinders. Long-term low engine speed: This leads to carbon deposits in certain areas, and even some parts becoming clogged with sticky, incompletely burned oil residue, further causing insufficient combustion and increased fuel consumption. Solution: Visit a professional auto repair shop to clean the engine, transmission, and fuel injectors. Some vehicles are equipped with an exhaust gas recirculation system: Normally closed during regular driving, if it malfunctions and opens while driving, it reintroduces a portion of exhaust gas into the cylinders, causing oxygen deficiency in the combustion chamber and resulting in incomplete combustion. Solution: Have the exhaust gas recirculation system repaired at a repair shop. Engine "misfiring": An engine with 6 combustion cylinders may have one cylinder not working or functioning poorly, leading to incomplete combustion and noticeable shaking while driving. Solution: Visit an auto repair shop to fix the malfunctioning combustion cylinder.