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Dear customer I am sorry that you have this kind of inconvenience, black smoke is a very important symptom of excess fuel in the combustion of the cylinders, this means that you may have problems in the fuel injection system that is injecting fuel excessively, this could mean that you have problems in the injectors or the injector pump. But also this type of problem occurs when there is little air in the mixture of the cylinders, this could mean problems in the EGR valve or turbo, I note that you have already checked the turbo and pipes but apparently you have a problem in the EGR valve while you do not solve this problem you will continue to present this smoke in the exhaust. You should also keep in mind that if you have problems in the exhaust all these problems will be taken to the intake and then to the engine through the EGR valve which means that you should check the exhaust system, you may have an excess of obstruction due to accumulated dirt.