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duramax black smoke

  1. General Discussion
    Ok, so I’ve got a 03 LB7 duramax, with 402,000 miles. it has a kinda rough idle, like it’s missing on a cylinder, with a constant power surge. when you give it some gas, either in park, or going down the road, it clears up and runs great, but it black smokes like crazy. I’m talking about cars...
  2. General Discussion
    So here I want to address the 07 duramax lbz. I’m curios on if there was ever a solution to staying out of limp mode without using diodes. I’d prefer to not add diodes, but if anyone has an updated more informative diagram I’d be grateful
  3. 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...
  4. 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?
  5. 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...
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