The LLY is capable of getting the largest amount of additional horsepower from tuning only versus any other Duramax engine except the most recent model in the L5P. In terms of weaknesses, the LLY traded the injector issues for overheating issues related to heavy-towing and blown head gaskets.
How long will a LLY Duramax last?
Overall, a properly cared-for Duramax engine should last over 300,000 miles. However, consumers report having Duramax’s lasting in the 500,000-mile range!
What problems do LLY Duramax have?
Head Gasket Failure is more common the LLY Duramax than any other Dmax generation. This is largely due to the huge factory turbocharger and overheating issues caused by a poor cooling system. There are other factors that can play a role too though.
Is a 2004 LLY Duramax reliable?
LB7: 2001 – 2004
As the original Duramax model, the LB7 is still extremely popular with diesel enthusiasts due to its lack of emissions control parts. In general, it’s a very durable and reliable engine.
Is the lly a good Duramax engine? – Related Questions
Which Duramax is better LLY or LB7?
The LB7 was the simplest in terms of emissions controls, while the LLY came with the largest turbocharger ever offered. The LBZ packed a host of improvements, including considerably more power, and the LMM was nearly a mirror image of it aside from its use of a diesel particulate filter.
How many miles do LLY injectors last?
Most well-maintained LLY injectors last between 150,000 to 200,000 miles.
How much horsepower does a 2004 LLY Duramax have?
The 6.6 liter LLY Duramax V8 engine was introduced during the 2004 model year as a replacement to the LB7 Duramax V8. As such, it powered Chevrolet Silverado Heavy-Duty and GMC Sierra Heavy-Duty pickup trucks through 2006, making up to 310 horsepower and 605 pound-feet of torque. Displacement: 6.6L / 403 cu.
What’s better LLY or LBZ?
Mechanically, the LBZ used the same Duramax parts as the LLY. However, the LBZ generated 360 horsepower over the LLY’s 310 horsepower. Torque increased as well, going from 605 pound-feet with the LLY to 650 with the LBZ.
Do LLY Duramax have head gasket problems?
One of the common issues we see with the Duramax engines is head gasket failures. The gaskets in all years of 6.6 Duramax pickups are a multi-layer steel style gasket.
How much does it cost to replace injectors in a LLY Duramax?
The total cost to have a mechanic replace 8 injectors on an LLY Duramax can range from $3500 – $4500 CAD, depending on what other work is performed at the same time. The good news is LLY injectors are located outside the valve covers so the task is considerably easier and cheaper than on prior LB7 models.
How much does it cost to rebuild an LLY Duramax?
Depending on on the rebuilder, a Duramax engine replacement is going to cost at least $15,000. Depending on the year and other potential issues or wishes of the customer, you could expect a range likely between $15,000 and $25,000 for Duramax engine replacement.
What are the signs of a failing injector?
Here are a few signs there might be something wrong with your fuel injectors.
- The Engine Misfires. Dirty fuel injectors may cause your vehicle’s engine to misfire.
- Idling Gets Rough.
- Your Gas Mileage Tanks.
- The RPM Needle Starts to Dance.
- Your Car Won’t Start.
Which Duramax has injector problems?
What year Duramax has injector problems? The LB7 Duramax built from 2001 – 2004.5 is known for injector failure. The good news is the replacement injectors you purchase from us incorporate several updates to help prevent repeat failures.
Which Duramax to avoid?
The Duramax has a long history. We recommend avoiding any GM vehicle equipped with the 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, and 2010 Duramax engines. In short, the newer model years show improved performance.
When did they stop making LLY Duramax?
LLY. The LLY (internally called the 8GF1) (engine code “2”) is a 6.6 L; 403.9 cu in (6,619 cc) turbocharged engine which debuted in mid-2004 and continued until the end of 2005. It is a 32-valve design with high-pressure common-rail direct injection and aluminum cylinder heads.
How long should you let a Duramax warm up?
As a general rule of thumb, if it is below zero degrees Fahrenheit, you should allow your engine up to seven minutes to warm up. If the temperature is between zero and fifty degrees, the warm-up period should be three to five minutes. Over fifty degrees will only require one or two minutes to warm up.
Is it bad to drive a diesel cold?
With winter in full swing, fleet owners may be thinking about what they should do to care for their diesel engines. The question on the minds of many this time of year is, “Should I let my diesel engine warm up?” Simply put, yes. In the colder months it’s a good idea to let your engine warm up before you hit the road.
Should you let a diesel idle before turning it off?
Unnecessary idling wastes fuel, causes air pollution and increases engine wear. An idling diesel engine produces much higher emissions than it would while using the same amount of fuel under load. Extended idling causes a build-up of soot inside the engine and results in a puff of black smoke when the engine revs.
Can you leave a diesel running all night?
It is true that diesel engines use barely any fuel while idling, far less than a gasoline engine. Diesels are durable engines anyway, and a semi driver who lets his engine idle overnight to keep warm can still expect to get hundreds of thousands of miles out of his engine.
Why do truckers leave their trucks running all night?
The most common reason to leave a truck idling, is severe weather. Both extreme cold and extreme hot weather, can present conditions where the driver may find it necessary to idle the truck, in order to be comfortable.