Why Does My Diesel Blow Blue Smoke?

On startup, a brand new diesel engine running at full load will experience some blow-by. Blow-by occurs when diesel fuel, air, or vapor is pushed past the rings and into the engine’s crankcase. In order for proper combustion to take place, the cylinder chamber must be kept at the right pressure. The rings in a new diesel engine need time to seat properly and form an airtight seal. The blow-by problem should go away after a few hours of break-in time under load. As a result, a properly operating diesel engine should emit no visible smoke from the exhaust system. If there is smoke coming from the exhaust, it could be a sign of a more serious engine problem. This article will assist you in determining the root causes of diesel engine smoke.

White, black, and blue are the three colors of diesel engine smoke. Smoke flowing from the exhaust pipe on a regular basis most likely signifies a more serious internal engine problem. Due to a lag before the turbocharger’s air flow can meet the increased volume of diesel fuel delivered into the cylinders, a little puff of smoke during rapid acceleration is normal with earlier diesel engines. Newer electronic diesel engines with common rail injectors synchronize the turbo’s speed to the metered flow of diesel fuel into the cylinder at the same time.

White Smoke:

The injectors are frequently the source of white smoke emanating from the exhaust system. White smoke usually indicates that the diesel fuel isn’t burning properly. Unburned diesel fuel will pass totally unnoticed through the exhaust system. White smoke should be avoided since it irritates the eyes and skin. When white smoke appears during a cold start and then disappears, it’s likely due to frozen deposits of soot that grew around the rings and then burned away as the engine warmed up. It is recommended that glow plugs be used during cold starts and/or that a flushing solution be used to eliminate engine muck.

Black Smoke:

In contrast to white smoke, black smoke has a high concentration of carbon exhaust particles. The lengthy chain of carbon molecules in diesel fuel is broken down into smaller and smaller molecular chains when it burns in the cylinders. The result of the exhaust leaving the engines is a mixture of carbon dioxide and water. If something goes wrong during combustion, the chemical reaction is not as strong, resulting in long tail hydrocarbons remaining intact and being ejected as smog or soot. When diesel fuel is partially burned, huge carbon dioxide particles and greenhouse gases are released, contributing to air pollution. The introduction of the Selective Catalytic Converter, Diesel Exhaust Fluid, and Diesel Particulate Filter all helped to regenerate exhaust back into the combustion chamber, allowing particulate matter to be broken down even more.

Black smoke is the most prevalent color of smoke produced by a diesel engine, and it indicates that something is wrong with the diesel fuel combustion process. The blend of air and fuel flow into the cylinders is the first place to investigate when diagnosing the problem. There could be too much gasoline, too enough fuel, too much air, or simply not enough air being delivered by the engine.

Blue Smoke:

Blue engine smoke is the most uncommon sort of smoke produced by a diesel engine. The presence of blue smoke indicates that oil is being burned. Blue smoke is not to be dismissed, although it is usual when starting a car in cold weather. When the oil is cold, it thins out, and some may escape into the cylinder and be burned. Due to deposits present around the rings or cylinders, cold temperatures can cause older, more worn rings to dislodge a little. Cylinder glaze, or the smooth deposits left behind as the piston rises and falls, can also accumulate and burn with time. After the initial break-in time, the seal between the combustion chamber and the crankcase should be entirely sealed. Using Lubriplate 105 or Molybdenum Disulfide during the engine rebuild will help the rings seat properly and burn off any carbon deposits upon restart.

Common Causes of Blue Smoke:

It is not something you should overlook, regardless of the color of the smoke. There should be no visible smoke from a properly operating and maintained diesel engine. If you notice significant smoke, make sure to turn off the engine right once, as any additional heat or load could badly harm the engine.

How do you fix a blue smoke from a diesel engine?

It’s time to inspect the engine if it hasn’t been cleaned in a while. Dirt can clog the oil return passages in the cylinder head and cause a leak if it gets lodged in the engine.

Remove the valve cover and remove any debris that has accumulated on it. It’s also a good idea to clean the drain back holes. Wipe off the engine to make sure no oil remains that could generate blue smoke.

It’s a good idea to inspect the engine while you’re cleaning it. If you find a location where oil may be seeping, address it right away.

What does blue smoke on a diesel mean?

There are a few fundamental differences between diesel and gasoline engines. Because the combustion process differs significantly (diesel engines don’t need spark plugs because they run at a higher temperature), the color of your exhaust smoke could suggest a variety of problems.

Here’s what the color of your exhaust smoke implies if your car or truck has a diesel engine.

Blue exhaust smoke

In a diesel car, blue exhaust smoke could indicate that oil is still being burnt, but it could also indicate that the engine oil is being atomized. This could be as a result of:

White exhaust smoke

If your exhaust smoke is white, you should be concerned if you have a diesel engine vehicle. The presence of white exhaust smoke indicates that the gasoline is not burning properly. This could indicate:

Is there smoke coming from your diesel engine? Then it’s time to contact our North Carolina experts for assistance.

Is blue smoke bad for a diesel?

If you don’t know what to look for, spotting blue smoke can be tough. ‘The’ “The hue “blue” is frequently weak. A blue haze should be visible in the overall picture “a “grey” type of smoke It’s easy to tell the difference. On a hot day, oil smoke has a distinct odor, similar to that of an asphalt parking lot or roofing tar. If the smoke is blue, I believe it should not be present at any time. It’s proof of a problem that needs to be looked into.

Some people have dismissed it as normal. There is no such thing as too much blue smoke. Because of the high compression, a new engine may be able to burn oil without producing any blue smoke. However, burning huge amounts of lubricating oil in any engine is not acceptable.

An oil and fuel additive is a fantastic preventative measure for your diesel engine. Check out this thing (link to amazon), I think it’s the greatest.

Let’s take a deeper look at what blue smoke could signify and where to begin looking for the source of the problem.

Can a blown head gasket cause blue smoke?

Because the head gasket is such a vital component of the engine, any hint that it is damaged should encourage you to have it fixed.

It can be tough to tell whether your problems are caused by a faulty head gasket. The trouble created by the head gasket will vary based on where the component fails, according to the AGCO Automotive Corporation of Baton Rouge, La., and other parts may give the same symptoms if they fail.

A misfiring engine or a harsh idle could indicate a head gasket failure between two cylinders, with compression leaking from one to the other. The gasket between the combustion chamber and the cooling system might also fail, causing the engine to overheat. The coolant and lubrication systems will fail, causing coolant to mix with oil. The gasket could potentially fail on the outside, allowing coolant and oil to escape.

A blown gasket can result in a vehicle’s sudden loss of power in the most severe circumstances. At this stage, getting the problem fixed is critical. Other indicators, on the other hand, will point to a head gasket problem before it becomes critical.

Exhaust smoke is the most prevalent indicator of a blown head gasket. White smoke indicates that coolant is leaking into the cylinders and is being burned by your motor. Blue exhaust smoke indicates a similar issue, except this is an indication of oil escaping from the gasket. Excess moisture or dripping water could potentially be coming from the exhaust pipe.

Another sign of a head gasket problem is the presence of coolant in the oil, which, according to CarsDirect, can degrade the oil’s lubricating properties. Look for a milky material, evidence of water, or oil that is brown and bubbling in consistency on your dipstick.

A hydrocarbon cooling test, according to AGCO Automotive Corporation, can reveal gasket issues. This test examines the vapors from the radiator’s coolant to see if there are any hydrocarbons, which is frequently an indicator of a head gasket failure.

Warping or corrosion of the head gasket could potentially cause problems. Overheating induced by coolant loss due to a blown gasket might cause the component to corrode further due to the release of corrosive coolant vapors. Fuel with a low octane rating can create increased cylinder head pressure in some automobiles, resulting in a knocking or pinging sound.

Due to the effort necessary to access the component, repairing the head gasket is a complicated and typically expensive process. To avoid damage to your head gasket and extend its life, AGCO recommends adopting some preventative measures. Coolant should be the correct type for your car, blended with purified water before being added to the engine, and replaced when the pH drops below neutral. Drivers should also address any issues with overheating or pinging as soon as possible.

Will thicker oil stop Blue smoke?

Is it possible to reduce smoke by using thicker oil? It will not result in a reduction in smoking. Oil pressure rises with heavier weight oil when it is cold, but soon it warms up, it drops back to zero.

Light or thin white exhaust smoke

Water vapor is often light or thin white exhaust smoke. The first time you start your automobile, especially if it’s a cold day, you’ll notice it. Condensation naturally collects in the exhaust system, causing this to happen. In cars, light or thin white exhaust smoke is prevalent.

Blue or gray exhaust smoke

Blue/gray exhaust smoke indicates that your engine is burning oil due to an oil leak. It’s time to call in a professional to look things over. The leak could be caused by leaking valve seals, faulty piston rings, or worn cylinder walls, among other things.

Blue smoke while accelerating indicates that your vehicle’s piston rings may be damaged. Blue smoke, on the other hand, indicates that the valve guides in the cylinder heads have been destroyed during deceleration. In either case, something has been harmed that shouldn’t have been. Take note of when the blue smoke appears to help your expert analyze the problem, then see your local Firestone Complete Auto Care!

Black exhaust smoke

When a car burns too much fuel, black exhaust smoke can develop. A clogged air filter, a defective fuel injection system, a blocked manifold, or a variety of other difficulties could be to blame. According to Consumer Reports, a clogged air filter won’t damage your gas mileage because of today’s automobile technology, but you’ll pay the price with poor performance. Have your vehicle inspected by a technician to see why it is consuming more fuel than usual.

Persistent, milky white/gray exhaust smoke

“In this instance,” says automotive writer Paul Brand, “the coolant would wind up being heated in the combustion chambers and blown out the exhaust as the engine begins.” In the summer, a coolant leak could easily lead to an overheated engine, which could leave you stuck on the side of the road.

Heavy white/gray exhaust smoke coming from your tailpipe could indicate a broken block or cylinder head, both of which are major issues that require immediate attention. Waiting too long could end up costing you money in the long run.

If your exhaust is emitting smoke signals, it’s best to leave it to the specialists. It’s possible that your automobile is trying to warn you of an oil leak, a faulty engine element, a clogged filter, or something else. Bring your car in today for a courtesy inspection and, if necessary, a vital repair at your local Firestone Complete Auto Care.

How do I stop my diesel from smoking?

So far, we’ve determined that a faulty fuel/air combination is the most common source of black smoke from a diesel engine exhaust. It’s critical to address problems as soon as you identify them to avoid further harm to your vehicle. This will save you both money and time.

When you observe black smoke coming from your exhaust, there are a few things you can do:

  • Always seek the advice of a professional. The authorized service of the Motor Company can assist you with any diesel-related issues.
  • Clean the ventilation system. As previously stated, the proper amount of air is required to successfully operate your diesel engine; otherwise, the fuel would only burn partially. If your air filter is dusty or clogged, cleaning it or, better yet, replacing it is a good idea.
  • Check the rings in your engine. When the engine piston rings are destroyed, black smoke can be seen coming from the exhaust when the vehicle accelerates. You should examine them in an auto repair shop to make sure this isn’t the case, and if required, replace them. This will also keep the black smoke at bay.
  • Make sure you have enough fuel. Fuel injection timing is also crucial. Incomplete combustion will occur if there is too much fuel injected. The best course of action is to have a professional mechanic inspect the fuel pump and injection system. A common-rail injection system, which feeds gasoline directly to the solenoid valves, is also an excellent option to update them with. As a result, the car’s exhaust will emit less black smoke.
  • Fuel additives should be used. Using ordinary fuel in a diesel car on a daily basis can lead to debris build-up in the cylinder chamber and fuel injectors. As a result, the engine’s performance will be reduced, and hence the fuel economy will be reduced. Another thing that creates more black smoke from the exhaust when the car is accelerated is this.

As a result, think about combining diesel fuel with a high-quality fuel additive. As a result, the fuel will not create deposits in the engine, resulting in no black smoke.

What causes a diesel to haze?

When starting the engine after a lengthy period of inactivity, a small amount of white smoke from the exhaust is usual. The wet condensation inside the exhaust pipes, muffler, and catalytic converter causes this smoke. When the engine heats up, the condensation evaporates and combines with the exhaust gas, resulting in a thin white smoke that may be seen. This could happen even while driving since the gasoline droplets freeze as they leave the heated exhaust, but this should stop once the engine is fully warmed up. If the smoke lingers even after the engine has heated up or becomes substantially thicker, it could indicate a more serious problem.

Do diesel or petrol engines last longer?

When deciding which car to buy, you may have to make a decision about which engine to get. So, is it going to be diesel or gasoline? Diesel engines are well-known for their superior fuel economy, and some even claim they are better for the environment. So, which is the better option? We’ll look at the advantages and disadvantages of each in this article. We’ll also address the crucial subject of whether diesel or gasoline engines endure longer.

Pros of diesel engines

  • If you drive lengthy distances, they are more cost-effective. It’s not a given that diesel engines are more cost-effective. In fact, if you frequently travel short distances, such as to the store or to pick up the kids from school. Then a gasoline engine is almost probably the more cost-effective choice. However, if you regularly spend hours commuting up and down the highway. A diesel engine, on the other hand, would provide you greater mileage for your money. A typical diesel engine generates about 30% higher fuel economy than a gasoline engine.
  • Diesel engines are regarded to be better for the environment because they have a higher fuel economy. Although the emissions they emit are dirtier than those produced by a gasoline engine, they can be regarded more environmentally beneficial because they provide more miles for the same amount of pollution.

They are more effective. A strong fuel injection system is used in diesel engines. This implies they’re more responsive and have more torque than their gasoline-powered equivalents.

Cons of diesel engines

  • Cars that run on diesel are more expensive. If you choose to buy a diesel car, you may expect to pay an extra £2000 on top of the vehicle’s advertised price. This may render any fuel economy benefits obsolete, so keep this in mind when making your decision.
  • Diesel fuel is more expensive than gasoline. While you get more miles for your money, the cost of fuel is higher, which causes some consumers to doubt the cost savings.
  • Not all automobile models are available in diesel, so if you have your heart set on a specific make and model, you may be out of luck if it isn’t available.

For a long time, transportation experts have predicted that diesel automobiles will be phased out in the United Kingdom. This is because the government is under pressure to prioritize air pollution reduction. The government wants to get rid of diesel cars from Britain’s roads by 2030. They have announced a scrappage program for diesel vehicle owners, which would begin in 2017. In this blog, we discuss whether or not diesel cars will be phased out.

Pros of petrol engines

  • At the pump, gasoline is less expensive than diesel. Not only that, but petrol automobiles have always been less expensive to purchase in general.
  • Some people prefer a petrol car’s quiet and refined driving experience over a diesel car’s.

Are diesel cars really more environmentally friendly?

Until January 2017, the government had led the way in promoting the use of diesel automobiles, claiming that they are 20% more efficient and hence better for the environment. Diesel engines emit twice as much hazardous nitrogen dioxide as their gasoline counterparts, which had not been considered. The government reversed its position in January, claiming that diesel engines are really worse for the environment and that measures will be implemented to restrict the number of diesel automobiles on British roads. Outdoor air pollution is responsible for 40% of deaths from stroke and heart disease, and nitrogen dioxide adds to certain serious health difficulties. According to Defra, nitrogen dioxide pollution causes 4% more deaths in the UK, or roughly 23,500 additional deaths per year.

So, do diesel or petrol engines last longer?

Diesel engines are more durable than gasoline engines. Diesel is a light oil that lubricates engine parts when burned and utilized as fuel by a vehicle. The engine’s life is extended as a result of this. Petrol is a detergent that removes oil from the engine’s components, causing it to wear out faster.

A petrol engine may typically go between 250,000 and 300,000 kilometers before it begins to burn oil and wear out. A diesel engine may easily travel 500,000 kilometers and still have room to go. Most mechanics estimate that if your diesel engine is properly maintained, it will last for 30 years on the road. (Image courtesy of The Globe and Mail)

Diesel engines endure longer, but they are more expensive to maintain. This is due in part to the complicated fuel pump, which is costly to fix or replace. A diesel car’s engine filters must be changed on a regular basis, and they can cost up to £100 apiece.

Will a diesel car be cheaper to lease?

As a result of the diesel scrappage scheme, a direct correlation between engine type and lease pricing is anticipated to become increasingly widespread. The residual value of the vehicle determines the lease price. The estimated value of the car at the end of the lease contract is known as the residual value. Until recently, diesel cars had a higher residual value and were thus less expensive to lease. Because the government is attempting to diminish the popularity of diesel vehicles, it is expected that the residual value of a diesel vehicle will be lower, resulting in a larger lease payment.

Why are diesel cars more expensive to insure?

Diesel cars are typically 10-15% more expensive than their gasoline counterparts. Diesel vehicles have higher average repair costs, which affects insurance premiums. Furthermore, insurers are required to include overall replacement costs in your premiums. As diesel automobiles are more expensive to purchase, this will increase your insurance rate in the event of theft.

Because insurance must consider in the greater overall replacement cost of a diesel if it is stolen, diesel automobiles have higher average accident repair costs overall.

In Conclusion

Choosing between a gasoline or diesel car used to be a considerably more difficult decision. However, new government laws and a forecast drop in the popularity of diesel cars over the next 25 years are causing concern. It might be a simpler choice. If you drive a lot of miles, a diesel car will still be the most cost-effective option. If you aren’t concerned about the car’s long-term resale worth. Alternatively, if you want to lease an automobile. Then diesel may still be a more cost-effective option than gasoline for you. However, if you don’t drive a lot of miles or are concerned about your car’s environmental impact, a petrol, hybrid, or electric vehicle will be the better option.