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.

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.

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 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.

Where are the fuses in a Chevy Silverado?

Passenger Compartment Fuse Box № A Protected Component 1 – – 2 10 HVAC Components, Electronic Suspension C 3 15 Front Axle Actuator, Transfer Case Shift 4 10 Passlock Sensor, Transmission Control Mo

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.

Why is LB7 injector failure a common problem?

We know today LB7 injector failure is a common problem, and because the operating tolerances inside the fuel system are so tight, proper lubrication from the diesel fuel is critical.

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 does my GMC Truck idle rough in the morning?

So the past couple months I’ve noticed my truck has a really rough idle in the mornings when it is cold out, to the point where it has even died before. I just replaced the plugs about 3 months back and it ran fine after, people have told me things like it is the o2 sensors to the cat is plugged up to my fuel filter is bad.

Can a Duramax engine run in the Cold?

The only question I can’t answer is how the new smaller duramax engine does specifically in the cold. I could always Start my 2015 Ram with a Cummins without plugging it in until -22F but after that it got cranky and didn’t run great so I would plug it in after that.

What should I put on my Duramax in the winter?

Put extra anti gel in the winter. Never had a problem even in -14 F unheated out side and engine block heater not plugged in. Always use Lucas Anti-Gel and Lucas Cetane Boost. Can’t speak for the DEF problem sure glad I don’t have use it.

Do you need a Duramax Diesel in Florida?

You wouldn’t need in Florida, but sure as hell would where I go in the cold mountains. I can assure everyone, there is no issue with DEF and it freezing and thawing up here in Canada.

Where to test diesel trucks in cold weather?

All that being said, I will say, you will rarely see diesel pickups in lumber camps in Northern Ontario (GM cold weather testing used to be in Hearst Ontario) because there is no hydro in the bush to plug trucks in. Again, not a DEF issue but rather a cold start issue.

What’s the low fuel pressure code on a Duramax?

Duramax LBZ and LMM P0087 Low Fuel Pressure code Summer comes, temps rise, and the working trucks with relatively high miles start to set a P0087 code and go into limp mode while towing. I am on the receiving end of continuous calls over the past few years inquiring what to do.

Where is the CP3 injection pump in a Duramax?

The CP3 injection pump sits in the valley of the engine between the cylinder heads and is driven by the camshaft gear, and it has two main jobs: get fuel from the tank up to the engine, and pressurize the fuel to 26,000psi and ultimately inject it into the engine.

When does a Duramax LBZ go into limp mode?

Summer comes, temps rise, and the working trucks with relatively high miles start to set a P0087 code and go into limp mode while towing. I am on the receiving end of continuous calls over the past few years inquiring what to do. This has prompted me to write this Tech Tip to help explain better what we are finding.

Why does my Duramax throttle response take so long?

He said that the throttles are sensor controlled and when you push on the gas the sensor can interpret that you want to go faster/slower than you want and it takes it a split second to figure out the correct reading and that can cause the hesitation. He said there was no adjustment and said i had to change the way i drive or deal with it.

What should I do about my Duramax diesel engine?

Temps drop to -40 F here and I have never had a problem with the way my diesels run. These diesel motors are not the dinasaurs of the 80’s. That is still a big misconseption. Like Shaners said, change the fuel filter. Also check your air cleaner. Thats what is sounds like to me. Duramaxes hate to be choked.

Why is my DMAX not working on my Silverado?

On the road the RPM’s are right where you need them, so a little throttle just sets you back in your seat with no downshifting. When it is cold outside, the Dmax isn’t much of a performer until it gets up to operating temps (which could take 10 miles or so). If the fuel filter has never been changed, then it is likely due to be done.

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.

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.

Why is the roller lifter on my Duramax not working?

Unfortunately, the latter scenario plays out more often than seizures do. Typically, the roller lifter (or bucket) that rides on the CP4.2’s shaft (the part that’s driven up and down via the plunger) fails due to lack of lubrication or debris hampering its ability to operate in an unobstructed manner.

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.

Where are the fuses on a Chevy Avalanche?

Fuse box diagram (location and assignment of electrical fuses and relays) for Chevrolet (Chevy) Avalanche (GMT900; 2007, 2008, 2009, 2010, 2011, 2012, 2013). Fuse box diagram (location and assignment of electrical fuses and relays) for Chevrolet (Chevy) Aveo (2002, 2003, 2004, 2005, 2006).

Where are the fuses on a Chevy Bolt EV?

Fuse box diagrams (location and assignment of electrical fuses and relays) Chevrolet (Chevy) Bolt EV (2016, 2017, 2018, 2019, 2020..). Fuse box diagrams (location and assignment of electrical fuses and relays) Chevrolet (Chevy) Camaro Z28 (1993, 1994, 1995, 1996, 1997).

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.

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.

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.

What kind of transmission does a Duramax diesel use?

It was the first to come bolted to the six-speed Allison transmission which provides a lower cruising RPM and greater fuel efficiency when compared to the five-speed on the LB7 and LLY.

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.

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.

Are there any problems with the Duramax fuel pump?

It can also be relatively difficult to prime the fuel system once air has been introduced into the system, such as when the fuel filter is changed. The 2001 to 2004 LB7 fuel filter housings seem to be the most prone to problems. Water pump failures for Duramax engine are somewhat common.

What causes fuel starvation in a Duramax Diesel?

Fuel Starvation and/or Air in the Fuel Lines. The Duramax diesel is susceptible to fuel starvation and getting air in the fuel lines. This can be contributed to the fuel filter housing design and the fact that the Duramax does not use a lift pump. Rather, the high pressure fuel pump (injection pump) is responsible for vacuuming fuel from the tank.

What to do if your Duramax injector is not working?

To relieve this problem, the wiring harness (or affected portion of the harness) will need to be replaced/repaired. Often, you can verify the problem by wiggling the wires around the injector. If the problem goes away (even momentarily), you’ve identified the affected zone.

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.

Are there any problems with the Ford Duramax?

Ford has the death wobble still effecting their trucks and you already had a bad one with their electrical issues. You like your loaner, Lemon that one and get another. Good luck and let us know what you do.

Why does my Chevy Duramax have park assist blocked?

My previous truck, a 2014 half ton, would do this after a car wash in the summer. Something was getting moisture in it, and it wouldn’t function properly until it dried out again. So… point being, while ice covering the sensor can cause issues, it’s not the only possibility.

When did I buy my new GMC Duramax?

I purchased a new 2020 GMC Denali 2500 with the Duramax back around March 14, 2020. The truck that I bought had right around 300 miles on it when I bought it. At 521 miles, I got the first CEL and immediately took it to my local GM dealer that happened to be a Chevrolet Dealer.

Can a Duramax go off at 5mph?

In defense of the system though, the PO may have put an aftermarket amp in or something and that screwed with the factory levels, i havent torn the dash off to look into it. Click to expand… Shouldn’t ever go off over 5mph.

We know today LB7 injector failure is a common problem, and because the operating tolerances inside the fuel system are so tight, proper lubrication from the diesel fuel is critical.

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.

What causes a fuel filter to leak on a Duramax?

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. The injection pump sucks all the fuel from the tank.

What causes a fuel injector to stop working?

Over time the nozzle of the injector can become dirty and partially blocked. When you shut off your engine the injector will, soak up the heat of the engine. This causes any fuel left in the injector to evaporate, leaving behind hard deposits, inside the injector. Over time, these will eventually block the injector.

What happens if the fuel injector is not working?

Fuel injectors are a vital part of a complex fuel management system. Furthermore, New technology has made fuel injectors more precise than ever in dispensing fuel. If the fuel injectors are not operating properly, then other parts of the engine will be affected as well.

What causes wear and tear on fuel injectors?

Driving a car hard, combined with short start stop journeys, will increase the wear and tear on injectors. Letting the engine cool down, before shutting it off, will increase the lifespan of the injectors. This will also, benefit the rest of the engine too.

Where can I get a fuel injector replacement?

GMC Sierra 2500 HD Fuel Injector Replacement at your home or office. Our mobile mechanics offer services 7 days a week. Upfront and transparent pricing. Our certified mobile mechanics can come to your home or office 7 days a week between 7 AM and 9 PM.

Can a fuel injector leak into the intake manifold?

Odor of raw gas or visible leaks. Fuel injectors should not leak fuel into the intake manifold when the car is off. If you notice any fuel odor around your car, the possibility of a leaking fuel injector should be considered. There should be no external leak from a fuel injector.

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.

What kind of injector does a GM 6.6L Duramax use?

Maximize the performance of the stock injectors in your 2006-2007 GM 6.6L Duramax with the DDP LBZ-50NZ 50HP Injector Nozzle Set (20% Over). No other upgrades provide you with the power and torque that a set of Dynomite Diesel Injector Nozzles can.

Which is GM 6.6L LBZ fuel system do you use?

Maximize the performance of your 2006-2007 GM 6.6L Duramax LBZ with the DDP LBZ-150 Remanufactured 60% Over Injector Set. This injector set is intended for use on 1000+ RWHP applications. Starting off as remanufactured, each injector receives extensive injector body modifications to flow more fuel.

When to replace the fuel injector on a Duramax LBZ?

Replace the failed injectors in your 2006-2007 GM 6.6L Duramax LBZ with the Bostech DE01368 Platinum Series Remanufactured Fuel Injector. The Platinum Series is a step up from the Bostech Silver Series.

Why is the fuel pump relay not turning on?

The ECM controls the fuel pump relay and this relay will only energize when commanded on. Does the check engine light come on; if not, then the ECM is not turning on. Do all the other combination meter warning lights come on?

What happens when a Duramax CP4 pump fails?

CLICK HERE to purchase our LML CP4 High Pressure Fuel Pump Failure Kit The 2011-2016 Duramax suffers from a high pressure fuel pump issue unique to this year range. Failure of this CP4 pump is usually catastrophic, causing instant contamination of the entire fuel system with metal particulates.

What are the symptoms of a bad Duramax fuel regulator?

Common Duramax Fuel Pressure Regulator Problems 1 Black Smoke. As we’ve said before, one of the most common problems that fuel pressure regulator experience is black smoke. 2 Strong gas smell. What are some of the most common symptoms of a bad fuel pressure regulator? 3 Hesitation on the gas pedal. 4 A decrease in power acceleration.

What should I do if my fuel pump is not working?

If the pump doesn’t deliver fuel, you may be dealing with a clogged, restricted fuel line, fuel pump electrical circuit problem or failed pump. If the engine dies within minutes of driving and it won’t start until the engine cools down, do the next test as soon as the engine dies: Open the hood and pull out a spark plug wire.

What causes black smoke in a Duramax engine?

The engine will increase the fuel pressure, which causes the fuel pressure regulator to produce more fuel inside than the engine needs. While it is true that black smoke could be another problem, most of the time, it is a faulty fuel pressure regulator causing the smoke.

Are there any problems with the Duramax fuel filter?

The 2001 to 2004 LB7 fuel filter housings seem to be the most prone to problems. Water Pump Failure. Water pump failures for Duramax engine are somewhat common. It is not unlikely that a water pump will need to be replaced in the 80,000 – 100,000 mile range.

Why does my Duramax diesel engine stop running?

These have only the injection pump and they have to pull the fuel out of the tank so any air leaks like a loose sensor will prevent fuel from getting to the injection pump and engine so it will not run. I ment that fuel came out of the bleeder when it was loose. I retightened it after.

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.

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 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 Chevy 2500HD to lose power under load?

Probably P0087. Check the fuel hoses at the side of the trans– they can get kinked, weak and collapse. I’ve just experienced a very similar situation with my 2005 2500HD. After driving about 2 hours, over varying terrain, I had to stop at a light (not the first on the trip).

What causes a Duramax injection pump to fail?