6.6 Duramax Diesel MPG 🏎️ Does It Have An Excessive Thirst?


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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


Chevrolet Duramax 6.6 LB7 iFixit

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 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.


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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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You'll also experience loss of power, excessive smoke, rough idling, and engine misfiring. Signs of Bad LB7 Duramax Injectors Here are common issues experienced when you have bad injectors. Excessive/Constant Smoke when Idling Hard Starts Fuel in Oil. Check Dipstick look for a surplus of oil or even smell the dipstick.


Chevrolet duramax 6.6 Diesel Engines For Sale Young and Sons

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 <<

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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 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.


6.6 Duramax Diesel MPG 🏎️ Does It Have An Excessive Thirst?

The following are other common problems with the 6.6 Duramax reported over several generations of the engine: Water Pump Failure: This problem was most commonly reported in the LLY and LB7 series that came out between 2004 and 2005. To fix this problem, a larger water pump was designed and fitted in the 2006 model.


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What could possibly be wrong with the 6.6 Duramax LB7?Subscribe: http://bit.ly/SubDeboss | Merch: https://debossgarage.com/merchWatch next, "My Thoughts On T.


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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.


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Is a 6.6 Duramax Diesel a Good Engine? 6.6 Duramax Diesel Problems 01. Head Gasket Failure 02. The Turbocharger 03. Overheating 04. Injector harness chafing 05. Water pump failure 06. EGR Problems How Can I Fix EGR Problems? Lack of factory lift pump How do I Solve the Absence of a Fuel lift Pump in My 6.6 Duramax?


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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.


Duramax 6.6 Diesel Engine

#1 · 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.


Common Duramax Diesel Problems, Troubleshooting, and Solutions Diesel

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.


Chevy and GMC Duramax Diesel Forum 6.6 Duramax High IDLE question

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.