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What are the most common LLY Duramax engine problems?

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What are the most common LLY Duramax engine problems?

The 6 Most Common LLY Duramax Problems. 1 1. LLY Bent Rods. While the LLY made competitive performance numbers back in 2004, the engine is certainly not competitive to the modern day diesels. 2 2. Head Gasket Failure – LLY Duramax. 3 3. EGR Valve Failure. 4 4. Glow Plug Failue – 2006 LLY Duramax. 5 5. Overheating in Pre-2006 Models.

What kind of water pump does a LLY Duramax use?

If you have a 2006 model LLY Duramax, this is the OEM Water Pump you will need to use. They changed designs in 2006 and the new part number is GM 12637105. Sinister Diesel’s Welded Water Pump Kit for 2001-2005 Duramax trucks feature a welded design which helps prevent impeller walk.

What kind of manifold does LLY Duramax have?

From the factory, the LLY came with a highly restrictive turbo inlet manifold (also known as the turbo mouthpiece or air intake elbow), which in turn made the turbocharger work harder to build sufficient boost. Replacing the stock unit with S&B Filters ’ high-flow turbo inlet manifold solves most of the LLY’s overheating problems.

What kind of engine does a 2005 Chevy Duramax have?

You will either have an LB7 or an LLY, and this category is specifically tailored towards the 2004.5-2005 LLY Duramax engines. Products in this section are designed to work on 2004.5 and 2005 6.6L GM Duramax equipped trucks unless otherwise noted. We get a lot of calls and e-mails each day with various product, vehicle, and installation questions.

Are there any problems with the LLY Duramax?

LLY Duramax trucks don’t suffer from the same injector failure problems that LB7 trucks frequently had. Instead, many LLY Duramax problems stem from overheating. A new variable vane turbocharger and an EGR system were also added. Check out our LLY Duramax Specifications chart below for detailed information!

From the factory, the LLY came with a highly restrictive turbo inlet manifold (also known as the turbo mouthpiece or air intake elbow), which in turn made the turbocharger work harder to build sufficient boost. Replacing the stock unit with S&B Filters ’ high-flow turbo inlet manifold solves most of the LLY’s overheating problems.

Is the Chevy Silverado 2500HD a Duramax part?

This 2005 Chevy Silverado 2500HD built by Steve L performs just as good as it looks. Sitting on 35’s with 20×10’s and a 6″ lift, this LLY Duramax features an MBRP Exhaust, EFI Live custom tuning, PPE gauges, ARP head studs and more! It isnt too often you can have the best of both worlds but for Jason W. its his reality.

What should the engine temp be on a 2004 Chevy Duramax?

My 2004.5 with 120k mi.fan clutch cycles very frequently also. Pulling a 8100 lb 5th wheel up a hill in the summer heat with a/c on. Temp gets to apx 235. Dash comes on and reads High coolant temp. It did it in 2019. I then replaced the fan clutch, waterpump and all coolant hoses.

Are there any problems with the Chevy Silverado 4WD?

But like most “upgrades,” these systems also consist of numerous components, which over time will wear out and cause problems. Like any truck, the Chevrolet Silverado has its fair share of known issues in regard to the 4WD system. Keep reading as this article will go over some of the more common ones, along with information on how to fix them.

Where can I buy a 2004 Chevy Silverado?

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What kind of engine does a 2004 Chevy Silverado have?

2004 Chevrolet Silverado 2500HD LT CREW 6.6L DURAMAX TURBO DIESEL 4X4 LOADED UP! * 6.6 LITER 8 Cylinder engine * * GREAT DEAL AT $20,988 ** ONLY ONE PREVIOUS OWNER * * 2004 ** Chevrolet * * Silverado 2500HD * * LT * People everywhere will love the way this 2004 Chevrolet Silverado 2500HD LT drives with features

How many miles does a Duramax 4×4 run?

If you have been looking for a nice clean crew cab Duramax 4X4 you just found it. This 04 model comes with 144,000 miles and it runs perfectly, it hasn\\’t been tuned and abused

What does shift range inhibited mean on a Duramax?

Well the “shift range inhibited” is your NSBS Neutral Safety Backup Switch on the transmission. They are know to go bad on the older trucks and the p0700 and locking into 4th is called limp mode.

What kind of turbocharger does LLY Duramax use?

In addition to EGR, the LLY switched over to variable-vane turbocharger (VVT) which helped improve engine performance over its predecessor.

What causes head gasket failure on LLY Duramax?

Head Gasket Failure – LLY Duramax The LLY has the largest turbo in it out of any other 6.6L Duramax variants. Outside of it being the largest turbo, it had the largest compressor wheel and the tallest exhaust vanes. The end result is having an extremely efficient and high-flowing turbocharger.

Why does my 2004 Duramax truck not start?

CLICK HERE TO RESET YOUR PASSWORD! 2004 Duramax WONT START! I have a 2004 duramax that i reciently changed the fuel line that goes from my fuel sending unit to my steel feed line.. I also replaced my fuel filter housing because the truck was loosing prime..

Why is my Duramax LLY overheating at 50 mph?

The fan clutch on that old gasser would never engage at speeds above 50 MPH, even in the hottest ambient temperatures and towing the heaviest loads. Above that speed, there was always enough airflow over the radiator to keep the engine quite cool.

Are there any issues with the Duramax check engine lights?

Glow Plug System Issues – Nearly half of the check engine lights that come in for the Duramax pickups are for glow plugs. The glow plugs burn out over time and can be a real nuisance to remove from the aluminum heads sometimes.

How often should I Change my Duramax engine oil?

Engine oil should be replaced every 10,000 miles or as indicated by the instrument cluster display. Frequent towing, idling, and severe climate driving will necessitate more frequent service. Applicable model years: 2001 – 2016 Chevrolet Silverado/GMC Sierra with 6.6L Duramax diesel

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 was the problem with the LBZ Duramax in 2006?

Glow plug failure was a concern on the 2006 model year LBZ and LLY Duramax models, but the problem should have been long corrected for owners of these years. The concern was that the glow plug module would over cycle the glow plugs, creating a scenario in which the tip of the glow plug could actually deform and/or break off in the engine.

Are there any problems with the Duramax diesel engine?

Overheating issues with the Duramax diesel seems to be a hit-or-miss problem; some owners experience it, while others never will. Regardless, it’s more common with the Duramax than other engines.

Are there any problems with the Duramax water pump?

This seems to be inherent of the factory water pump design. Overheating issues with the Duramax diesel seems to be a hit-or-miss problem; some owners experience it, while others never will. Regardless, it’s more common with the Duramax than other engines.

What should I do if my check engine light is still coming on?

Put the keys in your ignition and turn your ignition on and off consecutively after a second in each step. Once it is done, see if the engine check light is still coming on or not. If the check light is off, you are ready to go, but if it is still coming on, get ready by reading the codes with a scanner instead. Let it Go Off Itself

Glow plug failure was a concern on the 2006 model year LBZ and LLY Duramax models, but the problem should have been long corrected for owners of these years. The concern was that the glow plug module would over cycle the glow plugs, creating a scenario in which the tip of the glow plug could actually deform and/or break off in the engine.

What’s the Check Engine light on a Duramax?

Started up fine. Only thing i noticed was that the oil pressure was pegged out at 120 and the battery was around 10 or 11 marker on the gauge. Ran and drove fine. Keep in mind the temp was around 18F this morning when i left for work. You will need a scanner to pull the codes.

When did the Check Engine light go out?

So the check engine light went out on Sunday. Then on Monday i did a remote start using the fob (not the app) and for some reason it failed. When i got in the truck, waited for the plug light to go out, and started the truck, the check engine light was back on. Took it for a scan and the P133F code showed up 3 times.

Are there any major problems with the L5P duramax?

Mechanically, the L5P Duramax is stout and very few major problems have been reported. One common problem is with the MAP sensor however, as it tends to clog with soot and throw a check engine light, but a simple MAP sensor spacer and a can of electrical cleaner can get you back on the road worry free and prevent the soot from building up again.

What’s the glowplug code on my Duramax Diesel?

Had them pull the codes and they got 3 codes. P133F came up 3 times and then there was also a P0894. Any details you can share on those codes? P133F is #8 glowplug hot resistance fault. Did you determine if the Elevated Idle is enabled? Are you using remote start?

How does the EGR system work in a Duramax?

At a high level, the EGR system recirculates exhaust air back through the engine so that it can be re-burned in the combustion cycle, reducing the amount of nitrogen oxide released into the atmosphere. The EGR valve is responsible for determining when and how much exhaust gas is recirculated into the intake manifold.

How many versions of the Duramax diesel engine are there?

All told, there are six different iterations of the Duramax diesel engine: LB7, LLY, LBZ, LMM, LML, and L5P spanning from 2001 to the present day. Each version of the engine has its own issues and quirks, and some are less problematic than others.

What makes a Duramax LB7 diesel so special?

The introduction of common rail injection powered by the Bosch CP3 injection pump made the LB7 Duramax stand apart from other diesels of the day with excellent power and efficiency.

What happens when a Duramax engine goes down?

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. The failure is most common in higher horsepower engines, but can still occur in moderately modified and even stock power plants.

What causes the crankshaft on a Duramax to crack?

Or how about the fact that the rods in the LB7 and LLY engines can bend with added power and the LBZ and LMM mills are notorious for cracking pistons? Discover the worst failure point (s) of your Duramax in the article that follows, along with how to address it. 1. Snapped Crankshaft

What causes a Duramax injection pump to fail?

As a result (allegedly), the lack of lubrication in the fuel can cause a premature failure of the injection pump, to a point where it won’t allow the LML Duramax to run. You can be driving down the road and everything seems normal, and when the pump fails, the truck just shuts off.

What is the compression ratio of a LLY Duramax?

LLY Duramax Specifications Chart Manufactured Years: 2004-2006 Compression Ratio: 17.5:1 (2004 & 2005) 16.8:1 (2006) Firing Order: 1-2-7-8-4-5-6-3 Turbocharger/Air: GARRETT GT3788VA VARIABLE VANE Turbochar Fuel Injection: Direct Injection High Pressure Common Ra

What kind of engine does a Duramax LLY have?

The DFC Tow/Haul Standard Series Long Block is a remanufactured engine designed for improved towing and hauling in your 2004.5-2005 GM 6.6L Duramax LLY. Able to support up to 500 horsepower, this DFC engine is remanufactured to meet the most strict guidelines.

How big is a LLY Duramax diesel tank?

LLY Duramax Specifications Chart Manufactured Years: 2004-2006 Valvetrain: Overhead Valve (OHV) 4 Valves per cylind Engine Oil Capacity: 10 Quarts With Filter Fuel: Diesel Fuel Tank Size: Short Beds: 26 Gallons Long Beds: 34 Gal

How much does it cost to replace a Duramax engine?

Note: $500 Crate charge is included in core charge total. Engine shipping crate must be returned with core engine to receive full core credit. The DFC Tow/Haul HD Standard Series Long Block is a great alternative to replacing your entire 2004.5-2005 GM 6.6L Duramax LLY powered truck.

When does a LLY Duramax water pump fail?

While the seal issues found on LB7 trucks have been largely solved, the LLY Duramax can still suffer from water pump failure. Over time and at higher mileage, the seals in the factory water pumps can fail. This frequently occurs after 80-100,000 miles.

What causes a LLY Duramax fan to overheat?

Despite these issues, a majority of LLY Duramax overheating is actually caused by other common LLY Duramax problems. Blown head gaskets, water pump failure, fan clutch failure, and even a dirty or clogged radiator can be the root cause of your overheating issues.

Head Gasket Failure – LLY Duramax The LLY has the largest turbo in it out of any other 6.6L Duramax variants. Outside of it being the largest turbo, it had the largest compressor wheel and the tallest exhaust vanes. The end result is having an extremely efficient and high-flowing turbocharger.

What kind of engine does a Duramax 6.6L have?

Currently sitting on 18×9 Fuel Krank Wheels with 38×15.50 tires, this truck gets its clearance from a 7″ suspension lift. Under the hood, this LLY Duramax features a Banks Ram Air Intake System, MBRP Downpipe and a 4″ exhaust system that leads to a 6″ stack tip and more!

What kind of exhaust system does a Silverado Duramax have?

Under the hood, this LLY Duramax features a Banks Ram Air Intake System, MBRP Downpipe and a 4″ exhaust system that leads to a 6″ stack tip and more! This 2005 Chevy Silverado 2500HD built by Steve L performs just as good as it looks.

When did the first Duramax V8 engine come out?

Duramax Engine LB7 2001 to 2004 The first Duramax V8 was introduced in 2001 and was given the code name LB7. The introduction of common rail injection powered by the Bosch CP3 injection pump made the LB7 Duramax stand apart from other diesels of the day with excellent power and efficiency.

What kind of transmission does a Duramax pickup have?

Nearly all Duramax powered pickup trucks were equipped with the Allison 1000 automatic transmission, with the five-speed version running from 2001 to 2005, and the six-speed starting in 2006 and running until 2019.

Where is the pressure relief valve on a Duramax engine?

Included on the fuel rail is a pressure relief valve which is a spring-loaded valve on the back side of the fuel rail. The valve’s job is to release pressure in the event that it becomes too high. When pressures surpass the allotted threshold, the spring compresses, releasing rail pressure.

Can a 6.6 liter diesel engine start in cold weather?

At 6.6 liters, these engines (and all other diesels) are big hunks of metal. Because metal absorbs heat, and there is so much of it, starting a diesel engine in cold weather can be a challenge. The internal combustion temps have difficulty getting hot enough to ignite fuel and start the engine.

What kind of fuel does a Silverado Duramax use?

As for fuel I have always filled up at Sunoco with their Gold diesel. The previous owner did the same. I always run the tank to empty before refilling it. I get about 300-350kms to a tank.

Why is my Duramax diesel engine not starting?

I have seen more leaks causing no starts, loss of prime and low fuel rail pressure codes from poor fitting aftermarket fuel filters use Delco only. Remember when dealing with power loss and fuel pressure issues the duramax has no in- tank or frame mount fuel pump pushing fuel to the engine.

Where does the fuel leak go on a Duramax?

Fuel leaks on a duramax are almost always on the return side of the system, the smaller of the two fuel lines traveling down the frame rail, going to the fuel cooler and back to the tank. They can leak at the cloth covered rubber return lines at the injectors, these lines can only be replaced in sets left and right side, they are expensive.

The 6 Most Common LLY Duramax Problems. 1 1. LLY Bent Rods. While the LLY made competitive performance numbers back in 2004, the engine is certainly not competitive to the modern day diesels. 2 2. Head Gasket Failure – LLY Duramax. 3 3. EGR Valve Failure. 4 4. Glow Plug Failue – 2006 LLY Duramax. 5 5. Overheating in Pre-2006 Models. More items

All told, there are six different iterations of the Duramax diesel engine: LB7, LLY, LBZ, LMM, LML, and L5P spanning from 2001 to the present day. Each version of the engine has its own issues and quirks, and some are less problematic than others.

Nearly all Duramax powered pickup trucks were equipped with the Allison 1000 automatic transmission, with the five-speed version running from 2001 to 2005, and the six-speed starting in 2006 and running until 2019.

What was the code name for the Duramax in 2011?

In an effort to keep up with the ever-tightening emission regulations, GM redesigned its Duramax for the 2011 model year, and this time the code name was LML.

What should I do if my Duramax engine wont start?

With the engine OFF, loosen fuel filter assembly plastic bleed screw a turn or so, and depress the round priming pump on top of FF assembly until fuel squires out of vent. CAREFULLY close plastic vent nut with fingers or nutdriver. Depress pump until firm. Barely finger tight with nutdriver is all you need.

What kind of compression ratio does a Duramax have?

Thanks to a 17.5:1 compression ratio (the highest of any other engines in the Duramax lineage), extreme amounts of low-rpm cylinder pressure (i.e. torque) can be present when you’ve more than doubled the factory horsepower and torque rating.

Why are the Pistons on my Duramax not working?

Low-quality castings from its suppliers and a reduced amount of meat present in the wrist pin area (thanks to the use of wrist pin bushings) are to blame for factory piston failure. In most cases, the cast-aluminum piston cracks along the center line of the wrist pin, as shown above.

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Ruth Doyle