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Written By: Lawrence "LT" Tolman Whether you currently own a 6.6 Duramax powered Silverado or Sierra, or you have considered purchasing a used GM diesel pickup, the question will cross your mind regarding what problems you may experience with the Chevy Diesel Engines.
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#1 ยท Jan 29, 2021 Severe gas mileage issues. My 2019 with same 6.6L engine got 26mpg hwy 19 mpg cityand had 8 speed trans. Brand new 2021 2500hd diesel gets 16mpg hwy and 13 city with the 10 speed Alision. Seems like it doesn't go over 6th gear. I tested with rpm gauge at 60 mph on flat highway in Drive.
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2020 duramax. I just bought a 2020 Gmc 2500 Denali with the 6.6 duramax I've put about 3000 miles on it and noticed a knock noise it sounds just like a main bearing knocking so I brought in to let the dealership look at it and there telling me that the knocking sound is coming from the return oil pump and that is normal.
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The 6.6-liter Duramax diesel engine is one of the main motors you will find in General Motors (GM) trucks. While these engines are extremely durable and reliable, they do have some problems. Here are some common Duramax diesel engine problems and what can be done to fix them. Most Common 6.6-liter Duramax Problems 1. Issues With the Fuel Lift Pump
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1. Snapped Crankshaft Perhaps the most devastating of all Duramax failures is a broken factory crankshaft. Not only does this mean game-over for the engine, but it results in a truck that's down for weeks (if not months) and a huge chunk of change missing from your wallet.
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The Detroit News reports that GM is now facing a class-action suit alleging its 6.6-liter Duramax engine found in 2011-2016 Chevrolet and GMC models is not compatible with US diesel fuel.
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June 17, 2022 Although the 6.6-liter Duramax is sometimes called the best diesel engine in the Chevy lineup, we often get bad reviews and opinions from very irritated owners. We've decided to write a full article describing the most common issues and problems your Duramax diesel engine may have.
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Just the 2006 LLY was a detuned LBZ. Now it is different from the 2004.5 to 2005 LLY. Different generation completely. In 2006 CanBus interface was the standard for the OBDII interface.\. Brian. 2007.5 GMT-900 Chevrolet Silverado 2500HD CC/LB LTZ 4x4 Summit White. 4-18-2007. Powered by the LMM Duramax 365hp/660tq coupled to the MW7 Allison 1000.
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The 6.6-liter GM Duramax diesel engine has been a proven winner for heavy-duty trucks. But there are common problems that san the life of the engine. by Thom Taylor Published on May 26, 2022 3 min read The Chevy/GMC Duramax 6.6-liter diesel engine has proven to be a powerful and reliable workhorse since introduced in 2001.
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The 6.6-liter "DMAX," as it's commonly referred to by owners, stood strong against the competition from its debut in May 2001 through October 2016, when it was replaced by the all-new.
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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. Much of this superior performance is attributed to its massive variable vane turbocharger, the biggest turbo ever found on a Duramax truck.
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The most common problem with the water pump in the Duramax diesel 6.6L engine is total failure, and this spells serious trouble for you. We won't candy-coat it, the water pump's design is flawed. Consequently, you'll likely need a new water pump after 80,000 to 100,000 miles of driving.
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Duramax 6.6 Technical. Duramax Hard Parts. L5P . 1; 2; Next. 1 of 2. They started building mine this week. I really want this truck but if the problems persist I'll pass on it. NC-smokinlmm << 1) CP4.2 Injection Pump Failure Duramax "upgraded" the injection pump for the LML models, going from the Bosch CP3 to the CP4.2. The new CP4.2 pump actually flowed 20% less fuel than the CP3. This makes the CP4.2 highly incapable of handling additional horsepower without the addition of a lift pump. The Duramax V8 engine is a 6.6-liter Diesel engine produced by DMAX, a combined effort between General Motors and Isuzu. The Duramax debuted in 2001 as the successor to the 6.2L and 6.5L Detroit engines. It proved to be a powerful and great contender in the light diesel market. Six Problems Often Found in Duramax 6.6L Engines Duramax Engines have an excellent reputation for reliability. Each model year is associated with problems, especially when the engines reach 100,000+ miles. However, while Cummins engines may continue to edge out Duramax in terms of overall reliability, Duramax fans love their higher horsepower.
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