The main restriction is the turbo air inlet manifold. Unfortunately while this turbocharger provides significant air-flow, the LLY Duramax has several components that are extremely restrictive, resulting in problems because of it. This makes it a prime candidate for aftermarket upgrades like a tuner. The LLY Duramax utilizes a Garrett variable vane turbocharger (VVT) that has a bigger turbo compressor wheel and taller vanes than other Duramax generations. If you want to jump to a specific section, simply click on any of the bullet point links below. LLY Duramax Submitted From on Instagram What Are the Most Common 2004.5-2006 6.6L LLY Duramax Problems And How Do You Fix Them Most Common LLY Duramax Problems Here is a list of the 11 most common LLY Duramax problems and how to fix them.
So, if you’re looking to improve your LLY Duramax in more ways than one, you’ve come to the right place. Solving many of these problems will not only improve longevity and durability, but they can often improve performance too. You just need to have a little mechanical know-how. Thanks to the aftermarket, most of these problems can be solved relatively easily. In fact, a number of other common 6.6L LLY Duramax problems exist. These two components aren’t the root of all LLY Duramax Problems though. Like every other diesel out there, the emissions additions result in problems and lesser reliability. For that reason, they had to include a problematic EGR system to comply with emissions regulations. The LLY Duramax also came at a time when emissions regulations began to become stricter. Much of this superior performance is attributed to its massive variable vane turbocharger, the biggest turbo ever found on a Duramax truck. Some of these 6.6L LLY Duramax engine problems stem from the fact that it has significantly more horsepower and torque compared to the original Dmax. Thankfully, the LB7 injector problems were resolved, but some new problems revealed themselves. It can last hundreds of thousands of miles, but it still has its fair share of issues. The LLY Duramax engine found on 2004-2006 Chevrolet/GMC HD trucks is the second generation of the Duramax line. Identifying Problems Early and Bulletproofing 2004-2006 Chevy HD/GMC Diesel HD Trucks
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