Check Dipstick look for a surplus of oil or even smell the dipstick. Here are common issues experienced when you have bad injectors. You’ll also experience loss of power, excessive smoke, rough idling, and engine misfiring. This can lead to more serious problems, as diesel fuel doesn’t offer the same lubrication properties as oil. Both of these issues result in fuel leaking from the injector which can then enter the crankcase. The ball seat can deteriorate over time, resulting in an incomplete seal, and ultimately, injector leaking. The ball seat inside the injector can also become faulty over time. This can occur at anytime on the injector bodies themselves. What exactly were the issues of the original LB7 Duramax injectors? Well, for starters, the injectors themselves are vulnerable to cracking. When you pull up a vehicle’s Carfax, you can often also see it’s service history and get information on any major mechanical overhauls. If you don’t know the original owner, i’d recommend looking through the paperwork you received when you bought it, or you can look up it’s service history online. If you recently purchased your LB7 and it has lower mileage, it could still have the original injectors. That doesn’t mean the LB7 Duramax you own has this problem corrected though. Even GM acknowledged their problems when they corrected the original injector design and issued a 200,000 or 7-year warranty on the updated model. The most notorious LB7 Duramax problem is their original injectors. Here is our guide to the 7 most common 6.6L LB7 Duramax problems and how to fix them. With some aftermarket solutions, you can fix most of the 6.6L LB7 Duramax’s most common problems. That doesn’t mean the LB7 Duramax isn’t a great truck though. As with anything brand new, there were some kinks that needed to be worked out. As successful as the 6.6L LB7 Duramax was however, they do have their fair share of problems. These diesel engines are where the Duramax started, and they have been so successful that the Duramax are still used in GM HD trucks today. The LB7 Duramax engine made its debut on Chevrolet and GMC HD trucks in 2001. Certain engine packages include upgrades like ARP head studs and forged internals, allowing them to handle far more power than the original setup.What Are The Most Common 6.6L LB7 Duramax Problems? These engines have all been remanufactured to factory specs using some of the top brand name parts in the industry and meet or exceed OEM specifications. Complete crate engines are the most turnkey of all the engine alternatives, containing components such as intake and exhaust manifolds, fuel injectors, and even a turbocharger. A long block takes the base small block package and adds top-end components such as a camshaft, valvetrain, and complete cylinder heads. The block and rotating assembly with a crankshaft, connecting rods, and pistons make up what is referred to as a small block. ![]() XDP has the exact Duramax you need for your truck, whether you want a short or long block. XDP offers engines from industry leading brands such as Diamond Advantage and DFC. Whether you use your truck for towing and hauling heavy loads or as a daily driver, XDP has the perfect engine for you. Crate engines are available for the Chevrolet Silverado 2500HD/3500HD, GMC Sierra 2500HD/3500HD, as well as the GM Express/Savana Vans. XDP offers a wide selection of remanufactured 2006-2007 GM 6.6L Duramax LLY/LBZ engines to choose from. ![]() Don’t wait a few weeks or months for your local machine shop to rebuild your tired or failed engine.
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