What problems do the 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.
Is a lly a good truck?
The LLY is an awesome engine! As for the six speed on the 06′ and newer models, it’s a huge improvement and it’s not hard to turn your 5 speed into a 6 speed. Go for the LLY or the LBZ if you can.
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”.
What year is the LLY Duramax?
2004
The 6.6 liter LLY Duramax V8 engine was introduced during the 2004 model year as a replacement to the LB7 Duramax V8.
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 high miles for a LLY Duramax?
The Powerstroke engine is found in Ford trucks and, like the Duramax and Cummins engines, can often last up to 500,000 miles. However, as with the Duramax and Cummins engines, between 350,000 and 500,000 miles is usually considered high mileage for a Powerstroke engine.
What is considered high mileage for a Duramax?
350,000-miles
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.
Is the LB7 or LLY better?
LB7 gets way better fuel economy, runs cooler. I do like the automatic high idle on the LLY(with the auto start), beats walking out in the cold and flipping a switch.
How reliable is the LLY Duramax?
Outside of common maintenance and normal wear and tear items, you can count on the LLY to be a reliable work truck. For those towing frequently or in hot climates, upgrade the turbo inlet as it can lead to expensive head gasket replacement.
Are there any problems with the Duramax engine LLY?
Duramax Engine LLY 2004.5 to 2005 In terms of LLY injector problems, GM had sorted out the internal failures with the 2004 ½ redesign, but the LLY Duramax would occasionally exhibit a trouble code for the injectors, but in most cases it turned out to be an issue with the injector harness rubbing through and causing a short or open in the wiring.
What causes head gasket failure on LLY Duramax?
Head Gasket Failure 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.
What causes a Duramax diesel truck to overheat?
Its restrictions cause excess heat and force the turbocharger to work harder than necessary. The LLY experiences more overheating compared to other generations of the Duramax diesel because of its inadequate cooling system. They have the smallest radiators and fans found on any Duramax diesel truck.
What causes the LLY Duramax Turbo mouthpiece to choke?
The LLY Duramax turbo air inlet manifold, sometimes called the turbo mouthpiece, forces the turbocharger to work harder than it needs to. It does this by essentially choking the turbo because of its small, restrictive design, forcing it to work harder to produce the same amount of boost. This results in excess heat and EGTs.