Unfortunately, this led to the injection pump becoming a ticking time bomb. To get this type of power without compromising emissions, GM had to increase the fuel system pressure. The power was increased for this year to almost 400 horsepower and 765 pound-feet of torque. The LML was completely redesigned for its debut in the 2011 model year. This causes hot spots to form on the weakest part of the piston, which can lead to cracking. The LMM had six, which meant that two streams of fuel came out in opposing directions over the piston wrist pin. However, the LMM pistons were liable to break even easier.
Installing ppe fuel pump duramax mods#
That was one area of problems, but the other area was with the pistons.Īs mentioned above, excessive mods to get more than 600 horsepower can cause the LBZ pistons to crack. Mechanically, the LMM Duramax was almost exactly the same as the LBZ, but it included emissions control parts that the LBZ didn’t have. The debut of the LMM engine coincided with new requirements for emissions control parts. Provided you spend $20,000 in mods to exceed 600 horsepower, you might encounter an issue with pistons cracking. The only other minor issue is one found by expert tuners. Fortunately, it’s one of the Duramax diesel parts that can be added easily without spending a ton of money. The only real issue is something that GM simply didn’t install: a factory lift pump. First Duramax to come with a six-speed Allison transmissionĭid the LBZ have any problems at all? For the most part, it really didn’t.GM worked out the bugs of previous engines.It gets this designation for a few reasons: Other Duramax LLY problems included the following:Īs mentioned in our look at the best Duramax engine, the LBZ is generally accepted as the greatest Duramax engine ever built. The ideal fix is to use Duramax aftermarket parts like a cold air intake and either an aftermarket turbo inlet or one from a stock LBZ engine. The original turbo mouthpiece was too restrictive, which contributed to the engine running hotter. The stock air intake system was one of the culprits. Instead, the LL7 had issues with overheating when towing heavy loads or driving in hot temperatures. GM had fixed the injector problems by the time this engine came out. It was nearly identical to the LB7 engine and emissions control parts continued to be absent.
The LLY Duramax engine was only in production for a short time. Other significant problems with the LB7 included: If it does, you know a replacement job is in your future. When you go to buy a used LB7, it’s important to find out if it still has the original factory injectors. GM even recognized the problem as they eventually corrected the original design and offered a 200,000-mile warranty on the updated Duramax parts. Injector failure was a common problem on the LB7 engines. However, as the first models hit the 100,000-mile mark, some issues cropped up. In general, it’s a very durable and reliable engine. LB7: 2001 – 2004Īs the original Duramax model, the LB7 is still extremely popular with diesel enthusiasts due to its lack of emissions control parts. However, some Duramax engines have significant weak points that outweigh the strong points. As previously mentioned, every Duramax engine has strong points and weak points. Last time we looked at the best Duramax engine, now we look at the different problems in each engine to find out which one might be tagged as the worst.
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