The symptoms are constant smoke at idle and gaining fuel in the oil. ![]() The original injectors that came in these trucks had all sorts of issues with cracking. Injectors – It’s hard to have a conversation with any LB7 owner without the topic of injector issues coming up. Over the years these trucks have been really good performers, but they do have some common problems that we see over and over again. If you have a 2001-2004 Duramax 6.6 LB7 diesel pickup or are looking to buy one, here are some common issues and problems we have run into in our shop. GMC and Chevy Duramax LB7 6.6 Diesel Common Issues and Problems
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