I'm suspecting it is a diesel you are reffering to. Excessive black smoke is due to unburned fuel. You may have an injector issue where one or more is leaking. Very doubtful as to a turbo problem causing this. I would suggest a strong diesel fuel treatment in the fuel be tried first ( possibly several applications ) to see if it helps. Injector replacement is expensive
Testimonial: "Thank you Paul. Will try fuel treatment. Regards Nivian"
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