Black smoke and acceleration problems on Mini Paceman Diesel

Hello everyone, I own a 2010 Mini Paceman with a diesel engine and 132,000 km on the odometer. I've noticed that my car emits black smoke from the exhaust when accelerating, especially at low speeds. It also produces a 'machine gun' sound and sometimes accelerates suddenly. The orange engine light comes on from time to time. The first problems appeared last June. My mechanic checked the injectors without finding any problems and replaced the solenoid valve, but that didn't change anything. This winter, the problems subsided, but since February they have started again. My garage added a cleaning product to the diesel fuel and advised me to push the engine between 3000 and 4000 rpm. Even the Mini dealership doesn't know what to do. Would you have any advice or solutions to offer me? Thank you in advance for your help!

(Translated from French)

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