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2007 cateye duramax5/31/2023 This lack of a fuel lift pump puts some extra strain on the CP3 injection pump. While the CP3 has proven itself as reliable, it’s not only responsible for pressurizing the fuel before it’s sent to the injectors, but also for drawing fuel from the tank. A major part of this fuel injection system is the CP3 fuel injection pump. The 6.6L LB7 Duramax uses a high pressure common rail fuel system with direct injection. These lines can become contaminated and cause fuel quality issues. While you’re working on your LB7 you may want to think about replacing the fuel injection lines as well. It’s often too difficult for a novice mechanic and should be left for more experienced diesel mechanics. Replacement of LB7 injectors takes a long time because the injectors are located underneath multiple vehicle components. Most shops will charge you 10-16 hours of labor with a total injector overhaul costing over $3000 after paying for parts, labor, and taxes. For that reason, it makes sense to go ahead and replace all of the injectors, even if you’re not having problems with all of them. When you’ve found a faulty injector, it needs to be replaced and unfortunately, it isn’t cheap. Unfortunately, there is no good way to fix the factory LB7 Duramax injectors other than replacement. When fuel is present, you can often smell it. 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. What Are The Most Common 6.6L LB7 Duramax Problems?
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