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What causes blue smoke from exhaust of Technology

The majority of blue smoke from the exhaust is caused .

Blue exhaust smoke has a blueish tone, a specific density, and a burning smell. It is often confused with white smoke, but increases significantly in volume when you step on the accelerator. Blue smoke indicates that your Enclave is burning oil, which can be caused by worn valve seals, piston rings, or other internal engine components.Gray smoke. jorik/Shutterstock. Any of the colors listed above in less concentration may appear gray. Therefore, gray exhaust fumes could indicate a variety of problems. Unlike the straight ...When blue smoke is emitted from a car's exhaust pipe, this usually indicates that a leak in the engine's valve seals is allowing oil to leak into the combustion chamber where it is being burned along with the fuel. This may be due to natural deterioration or a faulty part. The smoke from a car's exhaust pipe can be one of several colours ...2009 5.3 thick smoke from exhaust on start. Well, imagine my disappointment the other day when, at the instant the engine started, a huge cloud of white-blue smoke filled my yard and lingered for over a minute. It was 25°F and the truck had been sitting overnight. It stopped smoking within 20 seconds from the tailpipe.The most common cause of white smoke coming from the exhaust is condensation from the exhaust system. It can also be caused by a leaking intake manifold gasket, a bad EGR cooler, a blown head gasket, or a cracked cylinder head. White smoke can either be very light, just like a vapor, or it can be dense and heavy smoke.4. You Have a Coolant Leak. White exhaust smoke from a coolant leak is the easiest kind to diagnose because the antifreeze in coolant has a sweet smell that comes out of the tailpipe when coolant is leaking. A great way to verify that diagnosis is to check the coolant level in the coolant reservoir and observe whether it is low.To fix blue or gray smoke: The easy way is to add a bottle of Motor Honey Oil Treatment to your motor oil with each oil change. It's specially designed to reduce oil burning and stop smoky exhausts. The hard way is an engine overhaul, which is about a hundred times more expensive and a thousand times more work.Blue Smoke From Exhaust Causes: Subaru Impreza. Here are the most common causes of blue smoke coming from your Impreza's exhaust: Valve Seals Worn Out. Your Subaru Impreza's valves let both air and fuel into the combustion chamber. They are lubricated like the rest of the motor. Valve seals are utilized to keep the oil from riding down the ...Blue Smoke. Blue smoke usually means your vehicle is burning oil. That means you have an oil leak, although how large of one is impossible to tell. The causes include bad seals, lack of lubrication of engine parts, or a plug gasket that has rotted out. While burning oil out the back of your vehicle might seem like a big deal, it is not as ...Turbocharger is Blown. Blue smoke from the exhaust indicates that the turbo must have blown. Blue smoke can be caused by a blown turbo or an oil seal leak. Either way, there is an oil leakage into the engine. Blue smoke is produced when oil and fuel combine inside the engine.Black Diesel Engine Smoke. Black smoke is caused by excess, unburned or partially combusted fuel, or conversely by inadequate air supply to your engine. In either case the fuel-to-air ratio for your engine has been altered significantly. The trick, of course, is figuring out where the excess fuel or restriction in airflow is coming from.Your car is sending out a distress signal begging for help. White smoke coming out of your exhaust suggests that coolant or water has inadvertently entered the combustion chamber. When it’s ...A white smoke from the exhaust when accelerating is usually a sign of something wrong with the engine. The most common cause of this problem is a clogged air filter. If the air filter is not cleaned or replaced, soot and ash will build up over time and cause white smoke to appear. Other causes of white smoke from the exhaust include a defective ...The most common cause of white smoke coming from the exhaust is condensation from the exhaust system. It can also be caused by a leaking intake manifold gasket, a bad EGR cooler, a blown head gasket, or a cracked cylinder head. White smoke can either be very light, just like a vapor, or it can be dense and heavy smoke.When you see blue smoke coming out, it usually means that your engine is burning a lot more oil than it should. The most common problem is piston rings, which would require a rebuild but oil could be leaking in from a few different places. Your best bet is to do a cylinder leakdown test. Basically, the mechanic will attach a pressure gauge into ...Blue smoke from your exhaust means your engine is burning oil, which can be caused by various faulty components. Learn the eight possible causes of blue smoke and how to …When blue smoke is emitted from a car's exhaust pipe, this usually indicates that a leak in the engine's valve seals is allowing oil to leak into the combustion chamber where it is being burned along with the fuel. This may be due to natural deterioration or a faulty part. The smoke from a car's exhaust pipe can be one of several colours ...Blue/gray exhaust smoke means there's likely an oil leak and your engine is burning oil. Time to have a qualified technician check things out. The leak could be caused by several issues like leaking valve seals, damaged piston rings, or worn cylinder walls. Pro-Tip: Blue smoke during acceleration means your vehicle’s piston rings may be damaged.A very common problem that affects all vehicles (including the Mitsubishi Eclipse) is blue smoke coming from the exhaust. Reasons for blue exhaust smoke include bad valve seals, valve train wear in general, the PCV valve, burning transmission fluid and more. Blue smoke indicates that your Eclipse's engine is burning oil. The question is.1840 posts · Joined 2017. #17 · Jun 1, 2018. If it's THAT dry and looking blue then I would believe it's oil smoke. Engine wear isn't the issue, it's simply going to burn oil thus excessive consumption on top of early catalytic converter failure. Even piston rings won't show as wear in oil analysis.Blue smoke from exhaust means your car engine is burning oil, which can be caused by overfilling, PCV valve, valve stem seals, piston rings, turbo or transmission issues. Learn how to diagnose and fix the problem before it causes serious engine damage or health hazards.The most common cause of blue exhaust smoke is oil leaking past engine seals and into the cylinders where it then mixes and burns with the fuel. This is most frequently seen in older or high mileage cars with worn seals and gaskets. It only requires a very small amount of oil leaking into the cylinders to cause excessive blue exhaust smoke.A very common problem that affects all vehicles (including the Jeep Grand Cherokee) is blue smoke coming from the exhaust. Reasons for blue exhaust smoke include bad valve seals, valve train wear in general, the PCV valve, burning transmission fluid and more. Blue smoke indicates that your Grand Cherokee's engine is burning oil. The.The smoke trails emitted from stunt or acrobatic planes are usually the result of injecting oil or diesel fuel into the exhaust. Often, coloring is also injected for effect. The fi...Black Smoke. Black smoke is the most common type of smoke that is emitted. Black smoke is from fuel left unburnt during the combustion event. The potential causes include fuel injectors sticking, poor turbo performance, EGR valve or EGR cooler issues, dirty air cleaners causing heavy restriction. This black soot is the main thing that the DPF ...Blue Exhaust Smoke. Blue smoke can have causes that are closely linked with those of grey smoke. In most cases, blue smoke will signal that engine oil is entering the combustion chamber somewhere, meaning it's coating the exhaust rather than lubricating the moving parts as it should. This can happen for several reasons, including the natural ...Blue or white smoke coming from your engine usually indicates burning oil, which can be caused by: Overfilling the crankcase with oil. Incorrect oil grades. Operating engine at greater than a 15 degree angle. Inoperative crankcase breather. Crankcase air leak.The Chevy 350 White Smoke from Exhaust indicates that something within the engine’s combustion process is not functioning as it should. The white smoke points to the presence of coolant or water vapor in the combustion chamber. An issue like this will always require a Chevy 350 engine diagram by your side, so ensure you have it.Blue exhaust smoke has a blueish tone, a specific density, and a burning smell. It is often confused with white smoke, but increases significantly in volume when you step on the accelerator. Blue smoke indicates that your Explorer is burning oil, which can be caused by worn valve seals, piston rings, or other internal engine components.A very common problem that affects all vehicles (including the Dodge Ram) is blue smoke coming from the exhaust. Reasons for blue exhaust smoke include bad valve seals, valve train wear in general, the PCV valve, burning transmission fluid and more. Blue smoke indicates that your Ram’s engine is burning oil. The question is.The colors of the exhaust smoke that your Trafic may produce will help you find the problem. In order of priority from the least to the most dangerous, these colors are: white, blue, black, mix of two colors. First, it should be said that the exhaust gas that is usually released through the exhaust pipe of your car is basically invisible.Overfilling oil in your car is another cause of smoke when you start it in the morning. When your engine has excess oil, it can easily leak into the combustion chamber and mix with the fuel. Since the engine cannot burn this excess oil, it produces smoke that comes out via the exhaust pipe. Excess oil also causes increased pressure in the ...According to the color of the exhaust smoke that is released from the exhaust pipe of your CX-5 you will be able to identify the possible causes. The colors of the exhaust smoke that your CX-5 may produce will help you find the problem. In order of priority from the least to the most dangerous, these colors are: white, blue, black, mix of two ...Common causes of exhaust smoke, according to its color: While the presence of exhaust smoke can indicate a serious car malady, there is a silver lining: the color of that tailpipe plume can give an indication of what might be wrong, which helps to generate a quick and efficient diagnosis. ... If the exhaust smoke is blue or gray: Thick blue or ...2009 5.3 thick smoke from exhaust on start. Well, imagine my disappointment the other day when, at the instant the engine started, a huge cloud of white-blue smoke filled my yard and lingered for over a minute. It was 25°F and the truck had been sitting overnight. It stopped smoking within 20 seconds from the tailpipe.The colors of the exhaust smoke that your Ranger may produce will help you find the problem. In order of priority from the least to the most dangerous, these colors are: white, blue, black, mix of two colors. First, it should be said that the exhaust gas that is usually released through the exhaust pipe of your car is basically invisible.When blue smoke is emitted from a car's exhaust pipe, this usually indicates that a leak in the engine's valve seals is allowing oil to leak into the combustion chamber where it is being burned along with the fuel. This may be due to natural deterioration or a faulty part. The smoke from a car's exhaust pipe can be one of several colours ...The blue smoke was caused by hardened valve stem oil seals allowing oil into the combustion chamber. This was mainly due to low oil by the previous owners not checking the level. This caused the chain to stretch causing the timing to go out and over heat the valve stem seals in the head.A cracked or damaged exhaust manifold can cause excessive smoke in four-stroke marine engines, including inboard and sterndrive engines. The exhaust manifold is responsible for collecting exhaust gases from the engine cylinders and directing them to the exhaust system. If the manifold is cracked or damaged, exhaust gases can escape and produce ...High operating temperatures damage internal seals, permitting engine oil and coolant leaks, leading to gray exhaust smoke. Overheating warps metal components, allowing liquid seepage past compromised points. Replacing damaged seals and allowing proper warmup cycles prevents overheating risks. Don’t ignore emerging temperature …Blue exhaust smoke coming from the exhaust pipe on a Transit Custom. At first sight this exhaust smoke seems white but it has a blueish tone, a certain density and a particular smell, like something is burning. Moreover, its volume increases significantly when you step on the accelerator. This blue exhaust smoke indicates that the lubricant oil ...Coolant or water can leak into the engine cylinder through this crack and burn up. The residual white smoke comes out of the exhaust pipe. Other than that, white smoke can also be due to blown or damaged . The head gaskets form a seal between the cylinder head and the engine block. This prevents the coolant from coming in contact with the fuel oil.Blue exhaust smoke has a blueish tone, a specific density, and a burning smell. It is often confused with white smoke, but increases significantly in volume when you step on the accelerator. Blue smoke indicates that your Explorer is burning oil, which can be caused by worn valve seals, piston rings, or other internal engine components.Blue Smoke from exhaust. Note: If the exhaust system produces blue smoke, it is necessary to check whether the engine is also drawing oil into the combustion chamber through the crankcase breather, which suggest that there is a fault in the area of the crankcase breather. A clear sign of a problem is an oiled up clean-air pipe.Black smoke often signifies there is too much fuel being burnt by the car's engine in relation to the amount of air - known as running rich. This can occur if your air filter is blocked, or ...Jun 19, 2017 · Blue/gray exhaust smoke means there's likely an oil leak and your engine is burning oil. Time to have a qualified technician check things out. The leak could be caused by several issues like leaking valve seals, damaged piston rings, or worn cylinder walls. Pro-Tip: Blue smoke during acceleration means your vehicle’s piston rings may be damaged.Another possible cause of blue smoke from exhaust is a blown turbo. Some owners of vehicles that are equipped with turbos have dealt with blue smoke that suddenly appeared in a big cloud as their vehicles blew a turbo. It can be caused by either a damaged turbo casing or by a turbo's broken seal. Whatever has caused the blown turbo, it is ...Catalytic converters and DPF filters are really expensive. The price for this is $1,200+ and the cost sometimes goes up to $2,500. And the most expensive job is probably if the engine drinks oil and this causes the black exhaust smoke. This problem will require a ton of money to be sorted out. $3,000+ in worst cases.First Alert smoke detectors are a crucial component of home safety, providing early warning in the event of a fire. However, homeowners may occasionally experience false alarms or ...Blue Smoke From Exhaust Causes: Chevy Corvette. Here are the most common causes of blue smoke coming from your Corvette's exhaust: Valve Seals Worn Out. Your Chevy Corvette's valves let both air and fuel into the combustion chamber. They are lubricated like the rest of the motor. Valve seals are utilized to keep the oil from riding down the ...The lawn mower blows blue smoke. Blue or white smoke is a sign that a small engine is burning excess oil. The excess oil in the engine causes incomplete combustion which will create smoke and a carbon buildup. The engine may run like this for a while but eventually, it will foul up and become increasingly hard to use and eventually die.Low oil shouldn't cause car smoke, but the issue should be why the oil is low. If the oil is low because it is seeping into the engine, then it's an issue. If it seeps into the engine, it burns along with the fuel and creates blue smoke. The problem also stems in if there is an external oil leak and the oil is dripping onto the exhaust ...First, you need to determine that the oil is coming from below the engine and not the valves. Blue smoke, when running the engine hard, is caused from a blow by the piston rings due to high pressure building up in the crankcase. Blue smoke at idle or cold start is most likely valve related. Valve related blue smoke can be from worn valves ...Aside from faulty fuel injectors, several other factors can cause black exhaust smoke in diesel engines. Some of the most common causes include: Air filter problems: A clogged air filter can cause the engine to receive less air, leading to incomplete combustion of fuel and black smoke. Turbocharger problems: A faulty turbocharger can cause the ...Blue exhaust smoke has a blueish tone, a specific density, and a burning smell. It is often confused with white smoke, but increases significantly in volume when you step on the accelerator. Blue smoke indicates that your 4Runner is burning oil, which can be caused by worn valve seals, piston rings, or other internal engine components.Grey smoke from an exhaust. Like blue smoke, grey smoke could be a sign of excess oil burning somewhere in the engine, or a turbo needing attention, but there are other causes. One might be a ... Jun 19, 2017 · Blue/gray exhaust smoke A very common problem that affects all vehicles (incBlue exhaust smoke has a blueish tone, a specific den

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Blue Smoke From Exhaust Causes: Toyota Camry. Here are the most common causes of blue smoke coming from your Camry’s exhaust: Valve Seals Worn Out. Your Toyota Camry’s valves let both air and fuel into the combustion chamber. They are lubricated like the rest of the motor. Valve seals are utilized to keep the oil from riding …Blue Smoke From Exhaust Causes: Ford Raptor. Here are the most common causes of blue smoke coming from your Raptor's exhaust: Valve Seals Worn Out. Your Ford Raptor's valves let both air and fuel into the combustion chamber. They are lubricated like the rest of the motor. Valve seals are utilized to keep the oil from riding down the valve ...The lawn mower blows blue smoke. Blue or white smoke is a sign that a small engine is burning excess oil. The excess oil in the engine causes incomplete combustion which will create smoke and a carbon buildup. The engine may run like this for a while but eventually, it will foul up and become increasingly hard to use and eventually die.White smoke often results from two key phenomena – fluid leaks into cylinders or poor air fuel ratios. Repair coolant leaks by replacing failed gaskets or seals. Adjust air ratios by scanning engine computer trouble codes, inspecting fuel injectors, swapping oxygen sensors, or replacing air filters.Black smoke from car exhaust indicates your vehicle isn't running at its best. This concerning symptom often signifies an imbalance in the air-fuel mixture, insufficient fuel combustion, or issues with fuel injectors, the engine computer, or even the air filter. The color "black" in the exhaust smoke is primarily due to excessive fuel ...Another common cause of the smoke on engine startup is overlapping piston rings. Because of this, you will often see gray and white smoke coming out from the exhaust. Oil can get into the cylinders also because of worn piston rings. This happens often when the engine is cold. After warming up, the piston rings are running properly, …A very common problem that affects all vehicles (including the Chevy Equinox) is blue smoke coming from the exhaust. Reasons for blue exhaust smoke include bad valve seals, valve train wear in general, the PCV valve, burning transmission fluid and more. Blue smoke indicates that your Equinox’s engine is burning oil. The question is.White smoke from the exhaust is typically caused by water vapor, coolant leaks, and other engine-related issues. When temperatures inside the engine rise, steam may form, which could be an ...Blue exhaust smoke has a blueish tone, a specific density, and a burning smell. It is often confused with white smoke, but increases significantly in volume when you step on the accelerator. Blue smoke indicates that your Suburban is burning oil, which can be caused by worn valve seals, piston rings, or other internal engine components.Oil leaking onto a hot engine or muffler can cause your riding mower to smoke when the oil burns off. Look over your mower for oil leaks. This could be due to a bad gasket on your engine. Find the failing gasket and replace it to stop the leak. Note: Oil spilled when changing your oil can cause smoking.Blue smoke. Blue smoke from a car exhaust is generally a bad sign, and the cause of it will need to be repaired as soon as possible. It’s either a problem to do with the oil, or internal engine components. In petrol cars, it might suggest that oil is leaking into the engine block where the fuel is mixed with air, while in diesel cars it may ...A very common problem that affects all vehicles (including the Chevy Tahoe) is blue smoke coming from the exhaust. Reasons for blue exhaust smoke include bad valve seals, valve train wear in general, the PCV valve, burning transmission fluid and more. Blue smoke indicates that your Tahoe’s engine is burning oil. The question is.The most common cause of white smoke coming from the engine is an external coolant or oil leak. The external coolant leak could also come from an overheating engine, which pushes the coolant out of the system into the engine bay. When your combustion engine is working the way it was intended, it produces a mixture of carbon dioxide and water vapor.Black or gray smoke often indicates a clogged air filter or your bike is running too rich. If you have a motorcycle with a carburetor, you need to adjust the jetting. If your motorcycle is fuel ...The top causes of blue smoke from exhaust can range from oil leak issues to stuck PCV valves, head gasket problems, mixing of oil with fuel, a damaged transmission modulator, faulty glow plugs in diesel vehicles, or issues with the cylinder head valve guide. Blue exhaust smoke from your car is generally a worrisome sign.Details. A blue, grey, or bluish-grey smoke or haze from your vehicle's exhaust indicates that engine oil is being combusted within the combustion chambers along with gasoline. In this situation, a typically thin blue or grey haze is visible from the exhaust, along with the naturally occurring white steam that may be visible at times as well.Smoking is an addictive habit that can lead to a number of health problems, ranging from various types of cancer to high blood pressure and heart disease. It’s also difficult to qu...Mar 11, 2022 · Lift the hood and locate the engine oil level dipstick which usually has a yellow handle on it to distinguish it from other components. With the engine off and the car on level ground remove the dipstick and wipe it clean, then reinsert and remove to observe the level. The level should be between the FULL and ADD marks.When it comes to maintaining a healthy and comfortable environment in your space, having proper ventilation is crucial. One popular choice for effective ventilation systems is the ...Stuck choke. Plugged air filter. Blue or White Smoke - This color of smoke is due to the burning of excess oil. It is best to follow the steps below to identify the root cause starting with checking the engine oil level followed by checking for damage to the piston rings, valve train, or engine gasket.Dec 24, 2021 · Blue smoke from exhaust means your car engine is burning oil, which can be caused by overfilling, PCV valve, valve stem seals, piston rings, turbo or transmission issues. Learn how to diagnose and fix the problem before it causes serious engine damage or health hazards.Catalytic converters and DPF filters are really expenBlue exhaust smoke has a blueish tone, a spec

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A very common problem that affects all vehicles (including the Volkswagen Touareg) is blue smoke coming from the exhaust. Reasons for blue exhaust smoke include bad valve seals, valve train wear in general, the PCV valve, burning transmission fluid and more. Blue smoke indicates that your Touareg's engine is burning oil. The question is.If you’re a motorcycle enthusiast, you understand the importance of having the right exhaust system. A high-quality exhaust not only enhances the overall performance of your bike b...Blue Smoke. Blue smoke usually means your vehicle is burning oil. That means you have an oil leak, although how large of one is impossible to tell. The causes include bad seals, lack of lubrication of engine parts, or a plug gasket that has rotted out. While burning oil out the back of your vehicle might seem like a big deal, it is not as ...4. You Have a Coolant Leak. White exhaust smoke from a coolant leak is the easiest kind to diagnose because the antifreeze in coolant has a sweet smell that comes out of the tailpipe when coolant is leaking. A great way to verify that diagnosis is to check the coolant level in the coolant reservoir and observe whether it is low.Blue Smoke From Exhaust Causes: Buick Encore. Here are the most common causes of blue smoke coming from your Encore's exhaust: Valve Seals Worn Out. Your Buick Encore's valves let both air and fuel into the combustion chamber. They are lubricated like the rest of the motor. Valve seals are utilized to keep the oil from riding down the valve ...1. Clogged Air Filter. If dust or contaminants block the air filter, there won't be enough air hitting the cylinder. Because of this, more fuel is going to be burnt, leading to black smoke in the exhaust. Additionally, you will notice heavier smoke when the vehicle is put under pressure.1. Blown Head Gasket. Blown head gaskets are famous for leaking excess oil onto hot surfaces. Blue smoke indicates that lubricating oil has made its way into the hot …Some 2017-2018 F-150 vehicles equipped with a 2.7L EcoBoost engine may exhibit excessive white or blue smoke from the exhaust at startup after a cold soak. If there is no associated oil consumption concern and no drivability symptoms present, do not attempt any repairs at this time.The smoke trails emitted from stunt or acrobatic planes are usually the result of injecting oil or diesel fuel into the exhaust. Often, coloring is also injected for effect. The fi...An automobile may emit smoke for a number of reasons. Black smoke signifies fuel burning, white or sweet-smelling smoke suggests coolant burning, blue smoke from the exhaust indicates engine oil burning. And a burning smell coming from the wheels could mean that the brake pads are too hot.An exhaust system carries waste gases and other combustion products away from an automobile engine. It allows the vehicle to operate with minimal noise, smoke and pollution transmi...Blue exhaust smoke has a blueish tone, a specific density, and a burning smell. It is often confused with white smoke, but increases significantly in volume when you step on the accelerator. Blue smoke indicates that your Camry is burning oil, which can be caused by worn valve seals, piston rings, or other internal engine components.To fix blue or gray smoke: The easy way is to add a bottle of Motor Honey Oil Treatment to your motor oil with each oil change. It's specially designed to reduce oil burning and stop smoky exhausts. The hard way is an engine overhaul, which is about a hundred times more expensive and a thousand times more work.Aug 31, 2022 · If an injector becomes clogged or fails, it could lead to white smoke from the car exhaust. Most of the time, the white smoke is due to an injector delivering too much fuel into the chamber. This causes your air/fuel mixture to be too rich, and not all of the fuel will get burned. The unburned fuel can create smoke in the exhaust system ...To fix the blue smoke from the exhaust, start by identifying the source of the issue. This could include worn cylinder walls, a faulty PCV valve, a degraded engine gasket, or other causes mentioned above. Once the cause is identified, appropriate action can be taken, from replacing faulty parts to adjusting oil levels.Worn-out piston rings or a bad piston only cause water to come from the tail pipe if the head gasket is also blown or there is already condensation in the exhaust. Additionally, bad pistons and rings can lead to other symptoms. You might notice a sooty exhaust, oily residue coming from the exhaust or blue smoke. Either way, you don't want to ...Blue Smoke From Exhaust Causes: Chevy Suburban. Here are the most common causes of blue smoke coming from your Suburban's exhaust: Valve Seals Worn Out. Your Chevy Suburban's valves let both air and fuel into the combustion chamber. They are lubricated like the rest of the motor. Valve seals are utilized to keep the oil from riding down the ...Blue smoke coming from the engine compartment can be an indication of engine oil leaking or dripping onto a hot part of the engine, more than likely an exhaust component. The oil drip will cause blue exhaust smoke when burned. Other possible causes of blue exhaust smoke coming out of the engine compartment may be due to an intake manifold ...When it comes to maintaining and repairing your vehicle’s exhaust and muffler system, finding a reliable and trustworthy shop is crucial. With so many options available, it can be ...New Zealand is introducing a series of proposals designed to make the country smoke-free by 2025, including raising the minimum smoking age. New Zealand aims to be entirely smoke-f...Normally, an engine burns fuel completely and emits water and CO2. Black smoke indicates that something is causing the fuel to only burn partially. It is an air/fuel mixture problem. Whether or not is bad for your engine depends on what the cause of the black smoke is. A little black smoke is normal on a properly functioning diesel engine, but ...1. Fuel System Issues. The first thing to check when encountering grey smoke is the fuel system. If the engine is getting too much diesel, it will result in incomplete combustion and cause grey smoke. It's like having too much cake at a party, sure it might taste good at the moment, but eventually, you'll regret it. 2. Blue Smoke From Exhaust Causes: Toyota Yaris. He