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duramax black smoke

  1. Duramax problems!!

    General Discussion
    Sorry if this isn’t the right place to ask for help delete it if I’m in the wrong section but I’m having some issues hoping someone can give me some insight I’m new to trucks especially Diesels I recently picked up a 2007.5 GMC Sierra 2500hd duramax the truck has 252,xxx miles when I got it I...
  2. Temporary muffler delete? stove pipe?

    01-04.5 LB7 Performance Parts Discussion
    i was wondering if i could use a piece of stove piping as a temporary muffler delete until i get an exhaust?
  3. too much smoke?

    04.5-05 LLY Duramax Powertrain
    I have a stock 2005 Chevrolet 2500hd WT with the duramax. When driving for 15 or 20 miles at a constant speed of around 65, I'll notice black smoke coming from the exhaust going up small hills. I also notice a complete lack of power and I can't hear the turbo spin up, just lots of black smoke...