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Are there any problems with the Duramax engine?

Are there any problems with the Duramax engine?

The failure is most common in higher horsepower engines, but can still occur in moderately modified and even stock power plants. Not specific to one version of Duramax in particular (ex: LB7, LLY, LBZ, LMM or LML), the problem exists across all generations.

What’s the RPM on a 2005 GMC Duramax?

Check out the thread “2005 6.6 max rpm 2000”, there are some suggestions there. Also search for the “ice pick trick” as it is one of the suggestions that often comes up for this problem.

Are there any problems with the Commons 6.6L Duramax Diesel?

Common Problems with the 6.6L Duramax Diesel. The 6.6L Duramax has been in production since 2001 and has proved, on a large scale, to be a relatively reliable and durable platform. While various versions of the engine have surfaced over the years, all generations of the Duramax are based on the same foundation.

What to do about a Duramax 6.6 LB7 engine?

If you are having a problem with your 2001-2004 Duramax 6.6 LB7 diesel engine, please feel free to give us a call. We carry a full line of repair and performance parts for these engines that we install in our shop on a regular basis. Odds are we have run across your problem before and would be glad to help. Call us at 1-877-367-9351.

The failure is most common in higher horsepower engines, but can still occur in moderately modified and even stock power plants. Not specific to one version of Duramax in particular (ex: LB7, LLY, LBZ, LMM or LML), the problem exists across all generations.

If you are having a problem with your 2001-2004 Duramax 6.6 LB7 diesel engine, please feel free to give us a call. We carry a full line of repair and performance parts for these engines that we install in our shop on a regular basis. Odds are we have run across your problem before and would be glad to help. Call us at 1-877-367-9351.

Are there any problems with the Duramax LMM?

One problem can rear its head when you are pushing the power of the LMM to a level GM never imagined, and that’s with the pistons. Simply put, they can crack under pressure. There are a lot of factors which dictate the power level where a piston bites the dust, but it’s usually north of 600 horsepower.

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 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.

One problem can rear its head when you are pushing the power of the LMM to a level GM never imagined, and that’s with the pistons. Simply put, they can crack under pressure. There are a lot of factors which dictate the power level where a piston bites the dust, but it’s usually north of 600 horsepower.

Are there any problems with the LLY Duramax?

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.

Why is my Duramax diesel engine not working?

The trucks computer keeps track of how much fuel needs to be added or subtracted from each individual cylinder to make the engine run smoothly, and this value is called the balance rate. If one cylinder is contributing too much or not as much as the rest, the cause is usually a bad injector and the cure is a replacement.

How to repair a LB7 6.6 Duramax engine?

We carry a full line of repair and performance parts for these engines that we install in our shop on a regular basis. Odds are we have run across your problem before and would be glad to help. Call us at 1-877-367-9351.

Are there any issues with the Duramax primer button?

Under the primer button there are some orings that fail on a regular basis. This can produce long cranks and hard starts. Glow Plug System Issues – Nearly half of the check engine lights that come in for the Duramax pickups are for glow plugs.

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.

Is the 3.0L Duramax a No Excuses engine?

“The 3.0L Duramax was designed to be a ‘no excuses’ engine option that offers excellent fuel efficiency, great low-end torque and smooth responsive operation,” Assistant Chief Engineer John Barta states. “We delivered on those targets with outstanding fuel economy, best-in-class 277 horsepower†

What is the first year of the Duramax?

The LB7 Duramax was first introduced for the 2001 model year as General Motors retired its 6.5L Detroit diesel. In every possible way, the Duramax was superior to the outdated Detroit and marked a revolutionary turning point for GMC and Chevrolet pickups in the diesel marketplace.

Are there any issues with the Duramax pickup?

This can produce long cranks and hard starts. 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.

What kind of oil does a GMC Duramax use?

Hello, my coworker and I both have the new 3.0 duramax. I have a GMC and he has a Chevy. He drives a lot of miles to work. His truck threw a code the other day and he wasn’t sure what is was. Has had a few issues in the past with his truck already. Got about 20k miles on it. Anyways we checked his oil and his dip stick was dry.

“The 3.0L Duramax was designed to be a ‘no excuses’ engine option that offers excellent fuel efficiency, great low-end torque and smooth responsive operation,” Assistant Chief Engineer John Barta states. “We delivered on those targets with outstanding fuel economy, best-in-class 277 horsepower†

The LB7 Duramax was first introduced for the 2001 model year as General Motors retired its 6.5L Detroit diesel. In every possible way, the Duramax was superior to the outdated Detroit and marked a revolutionary turning point for GMC and Chevrolet pickups in the diesel marketplace.

How does a Duramax crate engine get repaired?

Our engines are blueprinted, with connecting rods heat treated, machined, and shot peened. Cracked blocks, cranks, and heads are not welded or repaired; we simply won’t take an engine and put it up for sale unless we receive a high-quality rebuildable engine core in good shape.

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.

How does the ECM work on a Chevy truck?

Every Chevrolet truck has an engine control module that manages the electronic components of the engine and monitors sensors for errors. Returning the ECM to its factory state may be necessary to troubleshoot or resolve a number of problems. Step 1 Remove the nut from the negative battery cable using a socket set or wrench.

What causes a Duramax diesel engine to heat up?

When the engine is working hard, the turbocharger is drawing in a ton of air, and the restrictive stock turbo inlet tube can effectively choke the VGT turbocharger causing the compressor outlet temperature to skyrocket, heating up the intercooler, and ultimately raising the temperature of combustion and the coolant temp.

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.

How can I Keep my Duramax Diesel pump healthy?

However, there are measures you can take to keep the pump happy and healthy, the first being to always buy your diesel from a high-traffic, reputable filling station that’s known to dispense good, clean fuel. Second, always change the fuel filter at or before the recommended service interval.

What kind of pump does a Duramax cp4.2 use?

Like all Duramax engines from ’01-’10, the LML was also void of a lift pump from the factory. This means that not only does the CP4.2 have to pressurize fuel as high as 29,000 psi before sending it to the rails, but it also has to pull its low pressure fuel from the tank.

What are the problems with the Duramax LB7?

One thing the ’01-’04 LB7 Duramax is notorious for is injector failure. The two primary failure points of the factory injectors are internal cracking of the injector body itself and corrosion-induced failure of the internal ball seat.

However, there are measures you can take to keep the pump happy and healthy, the first being to always buy your diesel from a high-traffic, reputable filling station that’s known to dispense good, clean fuel. Second, always change the fuel filter at or before the recommended service interval.

One thing the ’01-’04 LB7 Duramax is notorious for is injector failure. The two primary failure points of the factory injectors are internal cracking of the injector body itself and corrosion-induced failure of the internal ball seat.

What causes the injector on a Duramax to leak?

Leaking Injectors—LB7 One thing the ’01-’04 LB7 Duramax is notorious for is injector failure. The two primary failure points of the factory injectors are internal cracking of the injector body itself and corrosion-induced failure of the internal ball seat.

How many miles does a LLY Duramax engine get?

With that being said, the block and internals on the LLY Duramax have stood the test of time and can easily surpass the 300,000 mile marker. With common and consistent maintenance, these engines are superbly reliable, especially when left in stock form.

How much power does a Duramax Diesel have?

Power was at an all-time high coming in at 397hp and 765 pounds of torque, and in order to provide this much power while still keeping pollutants low, GM needed to be able to increase the pressure in the fuel system to levels above what the tried-and-true CP3 could safely deliver.

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.

How many miles can you expect out of a Duramax?

Mine ran PERFECT when I sold it with over 130k on it. It used a little oil, maybe a quart every oil change which was about 8000-9000 miles. Id stay in the 140-160k range, there going from 12-16k. If its clean and has records, then go for it! 5th wheel or gooseneck on it?

Are there any problems with the GM Duramax?

In stock form and even when substantially modified, GM’s legendary V8 diesel can provide hundreds of thousands of miles of trouble-free use. Still, and just as we exposed the shortcomings of the almighty Cummins, the Duramax isn’t without its flaws—some of them catastrophic.

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 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 was the 2005 Chevy Silverado 2500HD purchased?

No accident or damage reported to CARFAX. 1st owner purchased on 04/02/05 and owned in IL until 09/26/07 • 2nd owner purchased on 11/03/07 and owned in WI until 03/01/08 • 3rd owner purchased on 03/01/08 and owned in MN until .

What are the specs of a 2005 Chevy Duramax?

Finally, the four-door, crew-cab truck was 256.2 inches long, 79.7 inches wide and 77 inches tall, with a 167-inch wheelbase. The regular cab’s interior offered 41.0 inches of headroom, 65.2 inches of shoulder room, 61.4 inches of hip room and 41.3 inches of legroom.

What kind of engine does a 2005 Chevy Silverado have?

The 2005 Chevrolet Silverado 2500HD was a serious work truck. It was ideal for towing heavy loads, shuttling gear and personnel around a job site and other demanding applications. The optional, high-torque Duramax diesel engine was the choice for buyers who needed maximum hauling power. Exterior & Interior Dimensions

What kind of engine does a Silverado 2500HD have?

The 2005 Chevrolet Silverado 2500HD was a serious work truck. It was ideal for towing heavy loads, shuttling gear and personnel around a job site and other demanding applications. The optional, high-torque Duramax diesel engine was the choice for buyers who needed maximum hauling power.

The 2005 Chevrolet Silverado 2500HD was a serious work truck. It was ideal for towing heavy loads, shuttling gear and personnel around a job site and other demanding applications. The optional, high-torque Duramax diesel engine was the choice for buyers who needed maximum hauling power.

Finally, the four-door, crew-cab truck was 256.2 inches long, 79.7 inches wide and 77 inches tall, with a 167-inch wheelbase. The regular cab’s interior offered 41.0 inches of headroom, 65.2 inches of shoulder room, 61.4 inches of hip room and 41.3 inches of legroom.

What kind of horsepower does a Chevy Duramax have?

The big engine produced 310 horsepower at 3,000 rpm and a massive 605 foot-pounds of torque at just 1,600 rpm when paired with the Allison automatic transmission. With either of the manual transmissions, its output dropped to 300 horsepower and 520 foot-pounds of torque.

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.

How many KMS does a Silverado Duramax get?

There is about 105000 kms or 65000miles. The black smoke is gone now, just left with a lack of power and crappy fuel economy. I talked to a guy last night that has the same truck, but an 07 and he gets about 650kms to a talk, I get 300kms! I’ll see if I can get one of those filters locally.

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.

What should I do if my Duramax engine overheats?

The bulletin applied to all 2004 and 2005 LLY Duramax engines. GM’s solution retrofits the new-style LBZ air intake to the LLY engine. I had a difficult time getting my mind around how a change in intake systems would solve an overheating issue. As a result, I did not pay much attention to the bulletin.

How much horsepower does a Duramax LLY have?

My first experience towing with my 2005 LLY Duramax was a thrill – and a disappointment. In stock form, other than some gauges and a power program that added about 100 crankshaft horsepower and roughly 180 foot-pounds of torque, there was no disappointment with the power – it was awesome!

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 are the most common problems with LLY Duramax trucks?

The most notorious problem found on LLY Duramax trucks is that they have a tendency to overheat. Part of this is attributed to their inadequate cooling system, that’s made up of the smallest radiator and fan ever found on a Duramax diesel truck.

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.

The bulletin applied to all 2004 and 2005 LLY Duramax engines. GM’s solution retrofits the new-style LBZ air intake to the LLY engine. I had a difficult time getting my mind around how a change in intake systems would solve an overheating issue. As a result, I did not pay much attention to the bulletin.

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.

What is the maintenance schedule for a Duramax?

When purchasing parts for your Duramax, be cautious with model years where an engine was phased in/out as the incoming engine may have parts that are not interchangeable with the outgoing engine. Always follow the severe duty maintenance schedule if you’re driving conditions include:

How often should I Change my 6.6L Duramax transmission?

6.6L Duramax Maintenance Schedule, Service Intervals. GM advises that the ZF S6-650 6 speed manual transmission does not require service. To maintain shift quality and promote transmission life, consider replacing fluid at 60,000 mile intervals, especially if usage meets any of the severe duty conditions.

What kind of engine does a GM Duramax have?

It’s been said before, but that doesn’t make it any less true: The 6.6L Duramax is one heck of an engine. In stock form and even when substantially modified, GM’s legendary V8 diesel can provide hundreds of thousands of miles of trouble-free use.

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 was the cause of death of my Duramax?

Vocational, Technical or Tra… Duramax died 5 seconds after start up, was running fine prior. Duramax died 5 seconds after start up, was running fine prior. Replaced batteries, cranks over fine, but still will not start. Pumped primer about … read more

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.

It’s been said before, but that doesn’t make it any less true: The 6.6L Duramax is one heck of an engine. In stock form and even when substantially modified, GM’s legendary V8 diesel can provide hundreds of thousands of miles of trouble-free use.

Can you get an oil change on a Duramax?

Yes, you can do most of the maintenance yourself: oil changes, fuel filter changes, air filter, tire rotations, etc. The Duramax V8 holds 10 quarts of oil. The extra oil and the fuel filter add cost to the equation. Getting the oil change done at a dealership or a shop will run $100 at a minimum.

Leaking Injectors—LB7 One thing the ’01-’04 LB7 Duramax is notorious for is injector failure. The two primary failure points of the factory injectors are internal cracking of the injector body itself and corrosion-induced failure of the internal ball seat.

Why is my Chevy Silverado running rough at idle?

Really, your Silverado will be running rougher at any RPM, but a misfire will be most pronounced at idle. Spark Plug Wires – While not every model and engine combination of vehicles today comes with spark plug wires (a lot are now coil on plug), if your Silverado happens to have them, they can go bad and cause a rough idle.

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

How long does it take to replace Duramax injectors?

The dealership estimates this job between 11-12 hours of labour. The injectors are underneath the engine’s valve covers. If two injectors failed, then it’s likely others will fail as well. It’s better to bite the bullet and replace all eight at once, and save of more labour costs.

Which is the best upgrade for a Duramax?

The Banks Ram Air Intake system is the perfect CAI upgrade to pair with their Six-Gun or EconoMind Diesel Tuners. It outflows the factory intake by 57%, and brings cooler, denser air to the engine. This results in respectable performance gains, lower EGTs, and better fuel economy.

What kind of maintenance does a Duramax do?

Heavy duty trucks, especially turbo-diesels, are costly to maintain. Yes, you can do most of the maintenance yourself: oil changes, fuel filter changes, air filter, tire rotations, etc. The Duramax V8 holds 10 quarts of oil. The extra oil and the fuel filter add cost to the equation.

The dealership estimates this job between 11-12 hours of labour. The injectors are underneath the engine’s valve covers. If two injectors failed, then it’s likely others will fail as well. It’s better to bite the bullet and replace all eight at once, and save of more labour costs.

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.

Under the primer button there are some orings that fail on a regular basis. This can produce long cranks and hard starts. Glow Plug System Issues – Nearly half of the check engine lights that come in for the Duramax pickups are for glow plugs.

Are there any problems with my 2003 Duramax?

Thaks for the help. injectors,water pump,headgaskets,injectors again,instrument cluster,steering shaft,pinion seal,and injectors again. I have on 03 with 66,000 on it and know problems. Friend of mine has 03 asmost same truck and know problems with 145,000 on it. Sure love mine. P:S Injectors should be warrantied to 200,000.

Are there any issues with the Duramax fuel pump?

The new injectors available from us and others are updated and do not have the cracking issue. Fuel Filter Housing Oring Leaks – The Duramax fuel system does not have any sort of low pressure fuel pump pushing fuel to the engine from the tank.

How long can a Duramax go out of service?

This special policy covers the condition described above for a period of 7 years or 200,000 miles (320,000 km), whichever occurs first, from the date the vehicle was originally placed in service, regardless of ownership. The repairs will be made at no charge to the customer.

Common Problems with the 6.6L Duramax Diesel. The 6.6L Duramax has been in production since 2001 and has proved, on a large scale, to be a relatively reliable and durable platform. While various versions of the engine have surfaced over the years, all generations of the Duramax are based on the same foundation.

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 are the diagnostic parameters of a Duramax diesel engine?

2005 6.6L (LLY) Duramax Diesel ENGINE DIAGNOSTIC PARAMETERS SENSED PARAMETER FAULT CODE ACCEPTABLE OPERATING RANGE AND RATIONALITY PRIMARY MALFUNCTION DETECTION PARAMETERS SECONDARY MONITORING PARAMETERS AND CONDITIONS MONITORING TIME LENGTH AND FREQUENCY OF CHECK MONITORING METHOD FAULT CODE STORAGE AND MIL ILLUMINATION

When did the Duramax 6.6L turbo diesel come out?

The Duramax 6.6L V8 turbo-diesel engine is nearing its 20th year of production, after debuting in 2001. Over the engine’s lifespan it has gone through 6 different engine variations: LB7, LLY, LBZ, LMM, LML, and L5P.

When do I need to repair my 2003 Duramax?

For 2003 vehicles covered by Vehicle Service Contracts, all eligible claims with repair orders on or after October 10, 2006 are covered by this special policy and must be submitted using the labor operation codes provided with this bulletin. Claims with repair orders prior to October 10, 2006 must be submitted to the Service Contract provider.

Why does my 04 LB7 engine not start?

Now engine wont start anymore. Went to start my 04 LB7 this morning to let it warm up before going to work. As I shut the door and walk away, the engine died. I tried to fire it back up but it just spins over and doesnt start. The truck has 144k, has about 3.5k on new injectors installed by dealer, fuel filter was replaced around the same time.

What causes a Duramax LB7 diesel to overheat?

The most common issue with the LB7 occurs when fuel leaks due to injector failure. When the injector failed, the fuel would leak into the crankcase, which cause oil dilution. This issue would typically lead to serious overheating, and in many cases, blown head gaskets.

Is the GMC Duramax compatible with diesel fuel?

The Detroit News reports that GM is now facing a class-action suit alleging its 6.6-liter Duramax engine found in 2011-2016 Chevrolet and GMC models is not compatible with US diesel fuel.

When did the first Duramax diesel engine come out?

His goal was to create a durable engine that would produce a longer service life, while efficiently sipping fuel. In 1998, Isuzu and General Motors embarked on a journey to turn Diesel’s initial concept into a reality, which has introduced more than 2 million Duramax engines into the consumer marketplace.

What are the problems with a Duramax diesel engine?

Both of these issues result in fuel leaking from the injector which can then enter the crankcase. This can lead to more serious problems, as diesel fuel doesn’t offer the same lubrication properties as oil. You’ll also experience loss of power, excessive smoke, rough idling, and engine misfiring.

What causes a Duramax crankcase to leak fuel?

The ball seat can deteriorate over time, resulting in an incomplete seal, and ultimately, injector leaking. Both of these issues result in fuel leaking from the injector which can then enter the crankcase. This can lead to more serious problems, as diesel fuel doesn’t offer the same lubrication properties as oil.

The Detroit News reports that GM is now facing a class-action suit alleging its 6.6-liter Duramax engine found in 2011-2016 Chevrolet and GMC models is not compatible with US diesel fuel.

What is the diagnostic code for a Chevy Duramax?

Below are common check engine light trouble codes for the Chevy/GM Duramax diesel. This list has been updated to includes Chevy/GM Duramax diagnostic trouble codes. At Thoroughbred Diesel we are a real diesel performance and repair shop that offers free advice. Call us at 1-866-737-4966 with any questions you may have about your diesel.

What makes the Duramax LBZ engine so reliable?

Unless you are looking to break the 600rwhp barrier, the Duramax LBZ engine is extremely reliable. The tune-only power capabilities combined with its reliability are what make the LBZ the most sought after Duramax today, nearly 14 years after it stopped production.

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.

Why is my GMC Sierra running rough at idle?

These packs are fired by the engines computer at exactly the right time to provide the optimal ignition timing. If a coil pack goes bad, it’ll cause a misfire and rough idle condition. Really, your Sierra will be running rougher at any RPM, but a misfire will be most pronounced at idle.

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 was the problem with my Chevy Duramax?

Pull into service bay and the damn light is off, problem solved. Bottom line, the truck gave NO prior warnings, gave an incorrect warning, and failed to detect a refill for some time.

When did my GMC Duramax go low on Def?

Truck gave me a “Service DEF” warning about 3,400 miles into the trip. No way it could be low on DEF, right? It gave NO warnings about DEF range, etc, as a 2011 should.

What causes the injector on a Duramax to fail?

The two primary failure points of the factory injectors are internal cracking of the injector body itself and corrosion-induced failure of the internal ball seat. The solenoid style Bosch units found in the LB7 employed a non-hardened internal ball seat to seal the injector.

What do you need to know about Duramax tuners?

During purchasing, the purchaser will fill in what tunes they would like built for their truck. The Ace is reserved for custom combinations. The Ace is set up for any combination of injectors, turbochargers, and pumps. Duramax Tuner satisfaction guaranteed. Tuner only for a select few with very special needs.

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.

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Are there any problems with the Duramax engine?

Are there any problems with the Duramax engine?

The failure is most common in higher horsepower engines, but can still occur in moderately modified and even stock power plants. Not specific to one version of Duramax in particular (ex: LB7, LLY, LBZ, LMM or LML), the problem exists across all generations.

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.

What causes the crankshaft to break on a Duramax?

Not specific to one version of Duramax in particular (ex: LB7, LLY, LBZ, LMM or LML), the problem exists across all generations. The crankshaft usually breaks near the number one rod journal due to a combination of excessive rpm and the large external counterweight.

When was the LML engine installed on a Duramax?

LLY (VIN “2”) Engine was installed from 2004-2005. LBZ (VIN “D”) Engine was installed from 2006-2007. LMM (VIN “6”) Engine was installed from 2007-2011. LML (VIN “8”) Engine was Installed from 2011 to current. To determine the correct part number and configuration available, please gather the VIN (Vehicle Identification Number).

What kind of engine does a GM Duramax have?

It’s been said before, but that doesn’t make it any less true: The 6.6L Duramax is one heck of an engine. In stock form and even when substantially modified, GM’s legendary V8 diesel can provide hundreds of thousands of miles of trouble-free use.

What kind of fuel pump does a Duramax use?

2. CP4 Failure This one is specific to the LML code Duramax produced between ’11-’16, which used the Bosch CP4.2 high-pressure fuel pump (vs. the predecessor CP3 found on LB7, LLY, LBZ and LMM engines). Unlike the ultra-durable CP3 that came before it, the CP4.2 doesn’t possess the same track-record for reliability.

What are the problems with the Duramax LB7?

One thing the ’01-’04 LB7 Duramax is notorious for is injector failure. The two primary failure points of the factory injectors are internal cracking of the injector body itself and corrosion-induced failure of the internal ball seat. The solenoid style Bosch units found in the LB7 employed a non-hardened internal ball seat to seal the injector.

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Ruth Doyle