What are the causes of white smoke, blue smoke and black smoke from car exhaust pipes?

Today, let's talk about the white smoke, blue smoke, and black smoke from the exhaust pipe, which are caused by what they are.

1. White smoke from the exhaust pipe.

When the car is cold in winter, you will often see white smoke from the exhaust pipe, which will disappear naturally as the engine temperature rises, and you generally don't need to worry too much about this situation, just because the engine is too cold, and the gasoline containing water enters the cylinder and is not completely burned, there will be white smoke. If the white smoke is accompanied by the unstable operation of the engine, even if the engine is preheated to normal operation, the white smoke does not disappear, it may be that the gasket of the engine cylinder is worn, resulting in a large amount of water from the heat dissipation system entering the combustion chamber, and after heating, water vapor will be generated, which will be directly discharged from the exhaust pipe to form white smoke.

Second, the exhaust pipe emits blue smoke.

The exhaust pipe emits blue smoke, which is generally really malfunctioning, mainly showing a decrease in the explosive power of the car, feeling weak acceleration, accompanied by the burnt smell caused by the combustion of organic oil, and abnormal oil consumption, so it is time to go to a professional repair shop for good maintenance. In this case, you can check from the following aspects: whether the oil level of the oil dipstick is too high, whether the intake valve guide is worn or whether the sealing ring is damaged, whether the piston ring is reversed, whether the gap between the cylinder and the piston is too large, etc.

3. Black smoke from the exhaust pipe.

If the exhaust pipe begins to emit black smoke, it is more important to pay attention to it, don't take it seriously, which indicates that the mixture is too thick, the combustion is not complete, and then accompanied by the engine shake, the exhaust pipe makes abnormal sounds, etc., most of them are also faulty, resulting in many reasons for the black smoke of the car exhaust pipe, you can start from the mixture is too concentrated and carbon pollution symptoms, such as checking the flow sensor, throttle position sensor, oxygen sensor working condition, as well as washing the intake tract, combustion chamber, three-way catalytic converter, throttle and other places. When encountering engine smoke, don't worry, slowly investigate the problem, sometimes it may be just a false fault and a false alarm, but if it is a real fault, early detection can also be dealt with early.

The blue smoke from the engine is basically burning the engine oil, and there are many reasons for this, roughly the following situations:

1. If the back pressure of the oil return oil circuit of the supercharger is too high, check whether the supercharger is leaking and whether the oil return pipe is blocked.

2. The exhaust gas valve is damaged, and the oil and gas cannot be separated, and it re-enters the combustion chamber for combustion.

3. The valve oil seal is aged, damaged or damaged, and the gap between the valve and the guide is too large.

Fourth, the oil exceeds the upper limit, so that the crankshaft throws the oil into the combustion chamber to participate in the combustion during high-speed operation.

5. The engine is severely worn, resulting in too large a gap between the piston and the cylinder wall, and the oil enters the combustion chamber through the gap.

Sixth, the piston ring is stuck, and the cylinder wall oil participates in the combustion. This is the reason why most cars burn engine oil.

The solution to burning engine oil.

Dismantling the engine for overhaul will destroy the airtightness and precision of the engine. And there is a possibility that the engine oil will burn again after tens of thousands of kilometers, so overhauling the engine is not sustainable.

With the progress of science and technology, the current dismantle-free repair technology has been very mature and has gradually been recognized and accepted by the majority of car owners. It not only saves the cost of car maintenance, but also protects the original car accessories. With exclusive patented technology, the company has universal non-destructive repair technology, which repairs and releases piston ring stuck oil while driving, and the effect is remarkable.

White smoke is basically water vapor. Blue smoke is basically caused by burning engine oil. The black smoke emitted from the car is basically caused by incomplete combustion.

When the car is cold in winter, you will often see white smoke from the exhaust pipe, which will disappear naturally as the engine temperature rises, and you generally don't need to worry too much about this situation, just because the engine is too cold, and the gasoline containing water enters the cylinder and is not completely burned, there will be white smoke.

If the exhaust pipe begins to emit black smoke, it is more important to pay attention to it, don't take it seriously, which indicates that the mixture is too thick, the combustion is not complete, and then the engine shakes greatly, and the exhaust pipe makes abnormal sounds, etc., most of them are also faulty.

It is only because the engine is too cold that the gasoline containing moisture enters the cylinder and is not completely burned, and white smoke appears.

This is also because the temperature of the engine is too low, and this will not be the case when the temperature comes up.

It could be that there was moisture in the exhaust pipe, and then white smoke was emitted.

White smoke is mostly due to the relatively low outdoor temperature.

Blue smoke can be used to check whether the oil level of the dipstick is too high.

As long as the temperature of the engine rises slowly. , there will be less white smoke.

What's going on with white smoke, black smoke and blue smoke coming out of the exhaust pipe.

1. Black smoke from the exhaust pipe.

Cause of failure: the quality of domestic gasoline is not good, coupled with poor road conditions, stop-and-go, the internal colloidal sludge of the combustion chamber is too dirty, the air filter is dirty, the air intake is insufficient, the carburetor is faulty, the EFI truck without carburetor may also be polluted by the oxygen sensor in the exhaust pipe, which cannot provide correct information to the gas distribution computer. You know, these problems will lead to carbon deposition in the valves, affect the tightness of the combustion chamber, cause the engine power to decrease, cause the vehicle to decrease in power, and slow acceleration.

Second, white smoke comes from the exhaust pipe.

Cause of failure: It may be due to the wear of the gasket of the engine cylinder, or the piston ring is stuck, the sealing is not tight, and a certain gap is generated, resulting in a large amount of water from the heat dissipation system entering the combustion chamber. Water cannot be burned, and when heated, water vapor is generated, which is discharged directly from the exhaust pipe.

How to deal with it. 1. Check whether the engine block and cylinder head gasket are damaged, and check whether there is water in the fuel tank.

2. Add gasoline with the correct label in strict accordance with the manufacturer's regulations.

3. Use KetiSg to repair the elasticity of the piston ring and remove the dirt inside the engine. Improved sealing performance.

3. Blue smoke from car exhaust:

Cause of the failure. The gap between the cylinder wall and the piston is too large, and too much oil enters the cylinder; The oil in the oil pan is added too much, and a large amount of oil escapes into the cylinder when splash lubrication; The high-temperature gas in the cylinder enters the oil pan, which makes the oil deteriorate, pollute and thin, and affects the lubrication effect; If there is blue smoke from a cold car, it proves that the valve oil seal is aging.

It is a good phenomenon that the exhaust pipe of the car is dripping, which proves that the fuel has been fully burned in the engine, and the exhaust pipe of the car will drip outward, which is actually a very normal phenomenon. The reason why the exhaust pipe drips is because the ambient temperature is relatively low, and the gasoline is completely burned to produce water and carbon dioxide.

Water at high temperature is the result of water vapor, water vapor condensation in the exhaust pipe and muffler, but when the ambient temperature is high, the water vapor has not yet condensed has been discharged, when the ambient temperature is low, the water vapor will condense into water droplets on the exhaust pipe wall, and flow out along the exhaust pipe.

Especially in winter, the external environment is relatively cold in winter, the air humidity is high, and the temperature difference between the inside and outside of the engine is large after the car is running, which is more likely to cause the phenomenon of water dripping from the exhaust pipe of the car. Many car owners may also see white smoke from the exhaust pipe when they encounter a lot of dripping water from the exhaust pipe of the car.

Extended Information: The Effect of Exhaust Pipes on Car Fuselages:

1. It can reduce vibration and noise and prolong the service life of the exhaust silencer system.

2. The main material of the exhaust pipe is stainless steel. For the average car, the noise can feel crazy because the car's exhaust fumes leave the engine under a lot of pressure.

3. The main function of silencing is the exhaust pipe of the car. Installing a muffler in the exhaust pipe of the car greatly reduces the noise of the car.

4. Its main working principle is to separate the airflow of multiple channels, only see the friction and impact of each other, so that the flow rate of the airflow gradually decreases, so that the repeated circulation, and finally the exhaust gas flows out through the exhaust pipe of the car to reduce noise. So as to achieve the effect of reducing the noise of daily cars.

This is because gasoline contains moisture and the engine is too cold, when the fuel entering the cylinder is not completely combusted, resulting in fog spots or water vapor to form white smoke. In winter or during the rainy season, when the car is first started, white smoke can often be seen. It doesn't matter, as soon as the engine temperature rises, the white smoke disappears.

This condition does not need to be serviced. Such as satisfied.

It may be that the temperature of the engine is very low, so a lot of water vapor will be generated, and there will be white smoke.

The reason for the white smoke emitted from the exhaust pipe of the car is that water and carbon dioxide are generated after the gasoline is completely combusted, and the water forms water vapor at high temperature, which condenses into water when it is cold, and the water droplets are small and suspended in the air will become white gas, and the condensed water droplets accumulate and become water.

Generally speaking, it is because of the aging of the exhaust pipe line, which leads to white smoke, so it must be checked in time.

It may be because there are some problems with your engine, it may be a problem with the lubricating oil, so it will emit white smoke, and you should go to the 4S shop for a detailed inspection at this time.

There are several reasons why white smoke comes out of a car's exhaust pipe.

Bright Net. Bright Net.

2019-05-06 · Guangming Network Official.

What are the causes of white smoke from car exhaust pipes?

Causes of white smoke from the exhaust pipe of the car: 1. When the car has white smoke from the exhaust pipe, it may be because the air filter of the vehicle is stained, resulting in insufficient air intake, or it may be because the carburetor is faulty, or the oxygen sensor in the exhaust pipe is polluted, resulting in the computer being unable to provide correct information to the gas distribution.

2. Normal white smoke is due to the exhaust gas in the exhaust pipe, and when the temperature of these exhaust gases reaches a certain layer, it will condense into water droplets; When the engine is running, the exhaust pipe discharges a large amount of water vapor and white smoke, and it is necessary to check whether there is water in the fuel tank, check whether the cylinder gasket is damaged, whether the cylinder block is cracked, and whether the cylinder liner sealing ring is good.

3. The high temperature in the cylinder will also cause the gas to enter the oil pan, which will cause the oil to deteriorate, which is a very common situation, so it must not be too much or too little when adding the oil. Under normal circumstances, the exhaust gas is just water vapor, but with the influence of high idle speed of the cold car, the water vapor will also appear white smoke. In fact, the phenomenon of white smoke is relatively easy to do, as long as there is no black smoke or blue smoke.

4. White smoke appears when the cold car starts, and as the temperature of the engine rises, the phenomenon of these white smoke disappears, so the white smoke in this situation is because the engine of your car burns very fully, and the white smoke produced by hot steam encountering cold air is a normal phenomenon. In winter, due to the low temperature, it is normal for the exhaust pipes of cars on the road to emit white smoke. If your car still emits a lot of white smoke at normal temperatures, go to a professional repair shop to check it out and solve the problem as soon as possible.

Causes of white smoke from vehicle exhaust: 1. Stains on the vehicle's air filter, resulting in insufficient air intake; 2. The carburetor is faulty, or the oxygen sensor in the exhaust pipe is polluted, resulting in the computer being unable to provide correct information to the gas distribution; 3. Normal white smoke is due to the exhaust gas in the exhaust pipe, and when the temperature of these exhaust gases reaches a certain layer, it will condense into water droplets; 4. The high temperature in the cylinder causes the gas to enter the oil pan, which makes the oil deteriorate and produces white smoke during combustion, so it must not be too much or too little when adding the engine oil; 5. White smoke appears when the cold car starts, and as the temperature of the engine rises, the white smoke also disappears, this situation is because the engine of the car burns very fully, and the white smoke produced by hot steam encountering cold air is a normal phenomenon.

If it's winter, it's very common for cars to emit white smoke because the white smoke we see is basically water vapor, and there are two scenarios:

1. Under normal circumstances, the water vapor after gasoline combustion is normally discharged through the exhaust pipe, and due to the low external ambient temperature, the water vapor will condense into small water droplets, which will change into water vapor that can be seen by the naked eye;

2. There is a fault, because part of the coolant enters the cylinder, with the discharge of the exhaust gas, because the temperature is very high, so it will appear in the form of water vapor;

3. So in most cases, it is not a fault that there is "white smoke" coming out of the exhaust pipe, but there are exceptions to everything, and it is not all normal for the exhaust pipe to have a large amount of "white smoke" coming out.

The reasons for the white smoke emitting from the exhaust pipe are: 1. The cooling water of the water tank is reduced; 2. The engine cooling channel or cylinder gasket is damaged, resulting in the cooling water entering the cylinder for combustion; 3. It is best to detect the cause, otherwise the exhaust pipe will cause corrosion due to water vapor coming out for a long time; 4. The exhaust pipe is corroded and damaged in advance.

A large amount of white smoke suddenly comes out of the exhaust pipe during a cold start. This situation is very normal, because there is too much moisture in the gasoline when the car starts cold, so the water will evaporate after starting and cause a lot of white smoke in the exhaust pipe, and we only need to warm up the engine sufficiently before this situation disappears.

The causes of white smoke coming out of a vehicle's exhaust pipe are:

When cleaning, there is a residue of cleaning agent sprayed inside;

The residual cleaning agent after the vehicle is started will be accompanied by combustion, and if the mixture is too thick, white smoke will be emitted.

The exhaust pipe is installed in the exhaust pipe between the engine exhaust branch pipe and the muffler, so that the whole exhaust system is flexibly connected, so as to reduce vibration and noise, facilitate installation and extend the life of the exhaust sound reduction system.