Is the LLY Duramax a good engine?
The 2nd generation Duramax is known as the LLY. Similar to the LB7, the LLY Duramax is reliable, powerful, and lacks most of the emissions found on modern day diesel trucks like the L5P. LLY Duramax trucks don’t suffer from the same injector failure problems that LB7 trucks frequently had.
What problems do LLY Duramax have?
Most Common LLY Duramax Problems
- Turbo Inlet Manifold.
- Head Gasket Failure.
- Injector Harness Chafing.
- Water Pump Failure.
- Overheating.
- EGR Valve Problems.
- Glow Plug Failure.
- Fuel Pressure Relief Valve.
How many miles will a LLY Duramax last?
GM has given the engine a 95% rating at 200,000 miles. This means that GM predicts that 95% of all engines will not reach 200,000 service hours based on durability and wear. If you want to know how long a Duramax engine will run, you should expect it to last as much as 300,000 miles before needing any major repairs.
What year Duramax has problems?
Premature injector failure was a critical problem for the 2001 to 2004 model year Duramax LB7.
Why do LLY head gaskets fail?
Blown head gaskets are fairly common in these earlier year trucks, as wear and tear, aftermarket tuning, and high mileage are all contributing factors to failure. The truck had started using coolant, a little at first, and then almost a quart a week.
What does LLY stand for on Duramax?
LLY doesnt stand for anything specific, its just the RPO (regular production order) code that means “Duramax diesel engine”.
Is 2005 a good year for Duramax?
2004.5-2005.5 2500 & 3500 Instead, this generation Duramax is known for overheating issues, namely when towing heavy. Best Year(s): Any year — just be prepared for the possibility of replacing the head gaskets and facing overheating issues if you plan to tow heavy.
What is considered high mileage for a Duramax?
According to Prosource Diesel, anything over 350,000-miles is considered high mileage for a used diesel pickup with a Cummins or Duramax engine under its hood. Anything over 350,000-miles is also regarded as high mileage for a Powerstroke diesel engine.
What year Duramax is most reliable?
Some engines are more popular than others. For example, the pre-emissions Duramax engines made between 2001 and 2007 are highly sought-after for superior reliability. On the other hand, the more modern engines add more horsepower, torque, and upgrade capability with Duramax performance parts.
What is the difference between Duramax LLY and LBZ?
The ’06 LLY is much quieter than the ’05. The ’06 LLY and LBZ have the same turbo (ask McRat, he put one on his ’05 LLY). It has the reduced compression, meaning that it has the LBZ pistons. If the LBZ piston has an increased wristpin diameter, then it stands to reason that the ’06 LLY also has the LBZ rods.
Does the LLY Duramax have head gasket problems?
Head gasket issues are more common with the LLY but still not bad if your not pushing big power. Injectors are better, most problems are with the injector wiring harness. Most overheating problems can be cured with an LBZ mp upgrade and an EGR blocker.
How do you tell if an LLY Duramax has a blown head gasket?
If your temperature gauge suddenly starts running colder than it always has, you may have a head gasket problem. The quickest and easiest way to check for combustion pressure in the coolant system is to squeeze the upper radiator hose while the truck is running.
