![]() ![]() ![]() While most known Duramax problems are associated with specific model years, fuel system issues plague all model years. DMAX fixed the issue after the 2004 model year. The problem was with the injector design. If you have an LB7, you want to be aware of them. Some 2001 to 2004 Duramax models have injector issues. Faulty injectors can cause dirty emissions. If you notice white smoke, it means your emissions are dirty. Injectors are a potential source of that leak. If you smell fuel inside your cabin, it indicates a leak somewhere in the fuel system. There are some non-performance indicators of injector problems, too. Of course, fuel efficiency is another problem. Misfiring is another sign of injector problems. Even if the truck starts, you may have to crank it repeatedly before it starts. You may not be able to start the vehicle. When your injectors stop working correctly, you can get a range of problems with your engine performance. Before it does, it pressurizes that fuel. Injectors are what get the fuel into the combustion chamber. Over time, the defective plug may become misshapen, increasing the chance it will break. If you have not handled the recall, take care of it as soon as possible. GM has recalled them because the plugs are faulty. Both the 2006LLY and LBZ models are known for their glow plug issues. Instead, you want to beware if you have a 2006 model. Not all Duramax 6.6L models have glow plug problems. If your smoke is white or black instead of thin and gray, you could have a problem with your glow plug. ![]() Your exhaust can also give you a clue like other potential diesel problems. Your truck may also have engine misfiring, rough idling, or hard starting. One big sign is you notice a drop in fuel efficiency. When glow plugs start to fail, you can experience many problems. They heat fuel and air to improve your engine’s combustion efficiency. You can find this engine in two GM pickup models, the GMC Sierra and the Chevrolet Silverado HD. DMAX produces the Duramax 6.6L V-8 turbo-diesel engine for the American market. General Motors owns 60% of DMAX, while Isuzu Diesel Services of America owns 40%. You may think of the Duramax as a General Motors engine. The earlier you can spot a problem with your engine, the more likely you will avoid serious trouble. Knowing about them ahead of time will help you spot problems early. However, there are some problems you may encounter with them. We think Duramax still makes a great engine. However, while Cummins engines may continue to edge out Duramax in terms of overall reliability, Duramax fans love their higher horsepower. Each model year is associated with problems, especially when the engines reach 100,000+ miles. Duramax Engines have an excellent reputation for reliability. ![]()
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