Why does my Duramax engine have white smoke at idle?

A common issue with the GM 6.6L LB7 Duramax engine is white smoke at idle. Worn and damaged injectors are often the cause however there are other causes and considerations that should be looked at prior to injector replacement. 1. Remove IGN 1 relay. 2.

What to do if your Duramax has a cold start?

Perform a glow plug system and intake air heater check even if there is no complaint of a cold start problem. 1. Engine compression. 2. Dilution of the oil with fuel. 3. Engine coolant temperature sensor. 4. Rail pressure sensor. 5. Proper fuel supply to the high-pressure pump.

Where does the coolant go in a Duramax?

1. Coolant may enter the cylinder from a damaged seal between the fuel injector sleeve and the cylinder head. The injector sleeve is often dislodged during an injector removal. 2. Remove the glow plugs and the IGN 1 relay and pressurize the cooling system to 15-17 PSI. 3.

What to do if your car has white smoke?

If no coolant is present and the vehicle has a history of low coolant level, check the rest of the cooling system, head gaskets and the EGR cooler for leaks. The Glow Plug System continues to operate for a time after a cold start to reduce white smoke and improve idle quality.

What does white smoke coming from the tailpipe mean?

In many cases, white smoke emanating from the tailpipe (often at idle once the engine reached operating temperature) typically means a worn out injector.

What causes blue smoke to come out of engine?

Blue smoke is normally the result of engine oil entering & burning inside the combustion chamber. This is most often caused by low compression, or worn piston rings. But what we see more often than not are issues related to worn injectors.

Why does my GMC diesel have blue smoke in it?

Blue white smoke that burns your eyes is un-burnt fuel; cold temperatures, high altitude and excessive idle time all mean cold combustion and white smoke. Possible bad injector, use the scan tool to cancel one cylinder at a time and see if the smoke clears up.

What causes excessive smoke after an extended idle?

Excessive Smoke after extended Idle??? If my truck is warm and I sit at idle for an extended time (5 min or more) when I take off there is a large cloud of blueish smoke. After driving for a short while (3 min or so) it clears right up and doesn’t do it again until long idle.

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 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 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.

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. The injection pump sucks all the fuel 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 black smoke coming from a diesel engine?

Black smoke is the most common smoke color coming from a diesel engine and most likely indicates something is wrong during the combustion of the diesel fuel. When diagnosing the problem the first place to look at is the mixture of air and fuel flow into the cylinders.

Why do I have blue smoke coming out of my injectors?

This can be caused by worn/leaking injectors or restrictions in the air intake system. BLUE SMOKE. Blue smoke is normally the result of engine oil entering & burning inside the combustion chamber. This is most often caused by low compression, or worn piston rings.

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 do I have white smoke coming out of my exhaust pipe?

White smoke is the issue when your car releases white smoke from exhaust pipe. White smoke can be a big problem or not, depending on the thickness. The white smoke is the result of normal condensation which builds up inside the exhaust system.

What should I do if my diesel engine is blowing smoke?

At the other end of the scale, it may be your last chance to act, before a catastrophic engine failure occurs (eg piston seizure, valve or turbocharger failure). This pack will stop your diesel blowing smoke or your money back! Simply add to your fuel and oil and the problem is solved. Should my engine be blowing white, blue or black smoke?

Why is my LMM engine blowing black smoke?

Any injectors that are more than +/- 6 are a possible cause for rough run. .Miss, smoke or rough run usually indicate that the injectors are the cause. LMM engines with a DPF may not show any smoke, but frequent DPF regen events would suggest poor combustion.

Why does a diesel engine smoke under load?

A short puff of smoke when an engine is accelerated under load may be acceptable, due to the lag before the turbocharger speed and air flow is able to match the volume of diesel injected into the cylinders.

What does white smoke mean on a Duramax engine?

White smoke from an LB7 Duramax engine often indicates faulty injectors. We’ve heard of rollin’ coal, but rollin’ snow? Not a good sign. Blowing white smoke is a red flag for your diesel engine, yet we see this happen all the time to our customers.

Why does my diesel engine have smoke coming from the exhaust?

Consistent smoke coming from the exhaust most likely indicates a deeper internal problem with the engine. A small puff of smoke during quick acceleration is acceptable with older diesel engines due to a lag before the turbocharger’s air flow can match the increased volume of diesel fuel injected into the cylinders.

What causes diesel smoke at Capital Reman exchange?

Diagnosing Causes of Diesel Smoke at Capital Reman Exchange Black smoke is the most common smoke color coming from a diesel engine and most likely indicates something is wrong during the combustion of the diesel fuel. When diagnosing the problem the first place to look at is the mixture of air and fuel flow into the cylinders.

Why does my Chevy Silverado have white smoke coming from the exhaust?

The color of your exhaust can tell you a lot about the health of your Chevy Silverado’s engine and emissions systems. When there is white smoke coming from the exhaust, it can mean a few things. It’s not necessarily anything to be concerned about.

What does white smoke in the engine mean?

A lot of white smoke typically indicates the following problems: Overheating Engine – The white smoke can indicate the engine is overheating. Check the temperature gauge. If you don’t have one there should be a warning light. If the engine is overheating currently, get it shut off as soon as safely possible.

What kind of truck blows out white smoke?

Hello, I own a 2003 Silverado 2500HD 6.6L Duramax with 286k miles. As of recent, the truck will blow out white smoke after a couple of minutes of running. The owner before me didn’t take the best of care of the vehicle and have been fixing things as I go.

In many cases, white smoke emanating from the tailpipe (often at idle once the engine reached operating temperature) typically means a worn out injector.

How to tell if your Duramax Diesel Turbo is gone?

If you can’t find the appropriate fitting, check boost at one of the vacuum ports. With the gauge connected, open the throttle and check the peak boost. All models should check in at 20 psi of boost maximum, with the rpm at about 1,800 for 2003 to 2004 LB7 motors and 1,600 for all others.

Why does the exhaust smell like burnt oil?

The exhaust will also have a burned oil smell. If the white smoke is coolant, your car is definitely having a crack in the cylinder head or a leaky head gasket, along with a sweet smell. In this situation, you can pressure test the cooling system if the coolant is low or the engine has been overheating.

Why does my Duramax diesel engine blow smoke?

Some diesel trucks can produce enormous black clouds smoke from their exhaust pipes. The black smoke is caused by unburned fuel. Many methods can blow smoke from a stock Duramax diesel engine, which is common in GMC and Chevrolet vehicles.

How to get rid of white smoke from a Duramax engine?

1. Remove IGN 1 relay. 2. Remove the glow plug from the suspect cylinder (s). 3. Crank the engine and check for fuel spray coming out of the glow plug hole. Caution: Make sure you are not in front of the glow plug hole during this process. 4. Replace any injectors on the cylinders that spray fuel.

Why does my diesel engine have white smoke coming from the exhaust?

Newer electronic diesel engines with common rail injectors simultaneously match the speed of the turbo with the metered flow of diesel fuel into the cylinder. White smoke coming from the exhaust usually points to one point of failure: the injectors. Usually, white smoke indicates that the diesel fuel is not burning correctly.

Is it illegal to smoke on a Duramax truck?

The most common and easiest to install aftermarket parts are chips that modify the air-fuel ratio, turbos that reduce boost in low gear and exhaust smoke kits. Because new trucks are designed not to smoke, often it is easier to buy an older truck than to modify a new truck to smoke. In many states, smoking exhausts are illegal.

Is it normal to have blue smoke from a diesel engine?

No amount of blue smoke is normal. A new engine may burn oil without any evidence of blue smoke because of the good compression it can burn oil cleanly. However, it is not acceptable for any engine to burn large amounts of lubricating oil. A great thing to do as a preventive for your diesel engine is a oil and fuel additive.

Why is there white smoke coming out of my exhaust?

Usually, white smoke indicates that the diesel fuel is not burning correctly. Unburned diesel fuel will make its way through the exhaust completely unused. Be careful of white smoke as it will irritate your eyes and skin. If white smoke occurs during a startup in freezing temperatures, then goes away,…

Why does my diesel engine have blue smoke?

Blue engine smoke is the rarest type of smoke emanating from a diesel engine. The presence of blue smoke is an indication of burning oil. Blue smoke should not be ignored but is common when starting an engine in a cold weather. The oil thins out when it is cold and some could escape into the cylinder and be burnt.

What kind of smoke comes from a diesel engine?

Blue Smoke: Blue engine smoke is the rarest type of smoke emanating from a diesel engine. The presence of blue smoke is an indication of burning oil. Blue smoke should not be ignored but is common when starting an engine in a cold weather.

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 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.

When to shut down a diesel engine with smoke?

No matter the color of the smoke it is not something you should ignore. A properly working and maintained diesel engine should produce no visible smoke. Make sure to shut down the engine immediately if you encounter excessive smoke as further heat or load could severely damage the engine further.

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