The Bosch CP3 fuel pump was integral in creating the extra pressure. In higher-power applications, the pistons were very prone to cracking. LBZ Duramax upgrades with larger injectors and a larger turbo caused the majority of failures. The cracks almost always occurred on the centerline of the lower wrist pin.
Symptoms of a cracked piston were very obvious with exhaust smoke and a bad misfire. The LBZ stock turbo was known for occasional sticking due to the accumulation of corrosion and carbon. Energetic acceleration sometimes helped the turbo to unstick, but the best way to fix it was to remove the turbo and clean it. Another issue came with the plastic impeller water pumps.
They were prone to failure on higher mileage engines and sometimes caused overheating while cruising. Despite this, most of the water pumps still lasted between , and , miles. Although the LBZ engine had a few weak links, overall it improved greatly on previous Duramax engines. It corrected previous issues with the LLY and LB7 engine and did not employ heavily restrictive emissions technology that often killed power and reliability in future engines.
If your factory radiator is falling apart or just not meeting cooling demands, check this thing out! For LLY Dmax trucks, Mishimoto makes an upgraded performance radiator offering even better performance.
If you need a new radiator, consider upgrading with this one from Mishimoto. Upgraded intercoolers provide your LLY Duramax engine with cooler, denser air. This results in cleaner combustion, lower EGTs, and gains in performance. During the EGR process, coolant is used to help lower these exhaust gas temperatures even further. At higher EGTS, coolant can experience breakdown.
Lowering EGTS helps reduce coolant breakdown and it also has a ton of other benefits too like increased fuel economy. Together, these products reduce restrictions caused by poor OEM designs and greatly improve air flow. The result is more power, greater fuel efficiency, and improved reliability. If you want cooler, denser air for your late model LLY Duramax, this is the kit for you.
For The EGR system, or exhaust gas recirculation system lowers emissions by re-introducing exhaust gasses back into the engine. The EGR Valve regulates the amount of exhaust being recirculated and also controls when recirculation occurs. The Cooler is responsible for cooling these exhaust gases before they are re-routed into the engine. EGR coolers use coolant to reduce the temperatures of these exhaust gases.
While this system does successfully reduce NOx emissions, coolant degradation can occur from the extreme heat of the exhaust temperatures. This can result in outright failure. These issues are nowhere near as common as they are in the 6. They still do occur however, especially in higher mileage engines. If your EGR system is acting up, it could be time for an overhaul. EGR Delete kits are an easy, inexpensive solution but they are not legal modifications on street driven, registered vehicles.
They are allowed on race trucks though! The parts tend to last quite a long time! There are some really good aftermarket alternatives however, that have proven themselves.
The factory glow plug controllers have been found to overcycle the glow plugs which could result in glow plug damage. The tips of the glow plugs can actually break off inside the engine, resulting in a worst case scenario of catastrophic engine damage. There is no way of suspecting damage until this issue actually occurs though. Fortunately for us, the likelihood of this happening now is very slim.
GM fixed the issue by reprogramming factory glow plug controllers to prevent this issue from happening. If you have bought a truck that has extremely low in mileage, it may be worth bringing the truck in to the dealership just to verify that the reprogramming has occurred.
The FPRV is a plug that utilizes a small spring to relieve fuel rail pressure when it gets too high. This is a great safety measure GM implemented, but over time, especially if your vehicle has power levels greater than stock, the FPRV can become a problem. After repeated use, the spring becomes weaker and weaker, until it gets to a point where it can no longer sustain even stock pressures.
This part wears even faster on modified trucks or even just LLY Duramax trucks with a tuner. Here are some common symptoms of a weak FPRV. Thankfully, this is a relatively cheap fix. There are three relatively inexpensive ways to solve a poorly working Duramax fuel pressure relief valve. The cheapest way is by installing a shim kit that adds shims to the factory FPRV.
It will restore the factory FPRV to hold up to pressure at or above its original levels. It will also still retain the FPRV as a safety measure to prevent damage from occurring on your truck. This is also an easy fix and involves removing the factory FPRV and replacing it with a plug that will not derate or release pressure at all. This is another kit that comes with an O-Ring too! This is another easy fix, but if your truck is heavily modified you will be doomed to the same problem eventually!
Like other Duramax generations, the LLY Duramax has an independent front suspension and is susceptible to common problems associated with this front end type. Independent front suspensions have their fair share of issues and weak points. They become especially prevalent once you put bigger tires, wheels, or modify the factory suspension.
Even a leveling kit can cause these issues. So what exactly are these issues? Luckily enough, there are aftermarket solutions for just about all these problems! Broken tie-rods are a common Duramax problem. The factory tie rods are built extremely thin and not suitable of a heavy duty truck. Off-roading or even just normal wear and tear can cause the factory tie rods to fail.
The best way to address the factory tie rods is by replacing them with aftermarket ones. If you compare the two side-by-side you will find the factory unit has a fraction of the thickness of any aftermarket replacements. Cognito and Kryptonite are two companies that offer quality aftermarket tie rod kits. The Cognito Alloy Series Tie Rod Kit improves tie rod durability and also offers more articulation than factory units. Photo taken from Cognito Motorsports Website.
Adding a leveling kit may give you some extra clearance, but it could also severely reduce ride quality and cause premature wear and tear on your front end components. This could result in ball joints and other components failing way faster than normal.
How do you fix steering geometry issues and bring back ride quality? Replacing the upper control arms on your LLY can bring back everything into factory specs and improve ride quality. If you are thinking about leveling your LLY, or if it is already leveled, you should definitely invest in a set of upper control arms.
Cognito and Kryptonite both make quality upper control arms that are a huge improvement over stock. Many people also choose to upgrade their shocks at the same time for superior dampening control. Fox and Bilstein shocks both make quality shocks that pair very well with these kits. They also have a heavier-duty ball joint for longer lasting life!
The 3. The Ram is another diesel-power pickup truck that knows how to make the most out of every gallon. The EPA says the 3.
When it comes to the argument of which is better between the Duramax or Cummins engine can be subjective. Some consumers are diehard fans of one or the other, so getting them to sway to the other side is a losing battle. They both serve the purpose of being a work vehicle that can tow heavy loads. The Cummins engine can tow the most for commercial drivers.
Both modern Cummins engines are quite capable of pulling what you need when hauling things like trailers. Diesel engines produce more than twice the torque of gas and hybrid engines. You can get even higher levels of power from Duramax and Cummins diesel. These numbers vary greatly depending on the engine type. When choosing between the two, you will also need to look at other factors. These factors include driveability, cabin space, and fuel mileage.
Compare them side by side before making a buying decision. Overall, a properly cared for Duramax engine should last over , miles. Nonetheless, proper maintenance is a must to increase the life expectancy of your engine. Tags: buying a vehicle , Chevy Silverado. November 2,
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