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carbon build up

  1. Anyone experience black exhaust from carbon build up?

    F150 Ecoboost Chat
    I have a 2013 Eco with 26,500 on it. I have noticed excessive exhaust for a newer vehicle on a cold startup for a while. A week ago a friend was following me and said he saw a cloud of black exhaust twice. I took it in today and Ford says it's common for direct injection engines to build up...