There is white smoke from the exhaust pipe: the reasons for what to do

Probably, all the car owners saw how it goeswhite smoke from the exhaust pipe. This is quite a popular phenomenon, especially in winter. Beginners are often frightened - they think that the car broke down. This phenomenon can be seen at the moment when the engine just started, and he began to warm up. In this situation, white smoke is quite acceptable. He tells the owner that a lot of moisture has accumulated in the exhaust system. We can say that this is not even smoke, but rather steam. Therefore, it is important to warm up the car qualitatively until all the moisture evaporates completely. The presence of moisture can be determined by drop of water. They will accumulate on the edges of the silencer pipe. After all the systems and in particular the exhaust are completely warmed up, the steam disappears completely. Let's take a closer look at where the white smoke from the exhaust pipe comes from, we will analyze the reasons for this phenomenon, because the matter here can be not only in high humidity.

When is this a problem?

In winter, when the engine warms up, the steam from the car's exhaust pipe is the norm. However, if it comes from the pipe in the summer, and even with the engine warmed up, this is already a cause for concern.

Perhaps the blame for the cylinders. They can get moisture, and therefore steam will form. Another option - the punched head of the cylinder block. Here you need to take a deeper look at the technical part. The destruction of the cylinder head sometimes happens because of the water contained in the cooling liquid. When the fuel is burning, the water simply does not have time to completely evaporate. Therefore, there is white smoke from the exhaust pipe. It should be noted that the color and hue of the steam may not be entirely white. It depends on many factors, including the type of coolant, air temperature and humidity level. It happened that, in poor lighting, white smoke from the exhaust pipe at the start was confused with the smoke from burning oil. But here it is easy to draw conclusions on the residual indicators. Oil pairs have one interesting property - they hang in the air. A vapor instantly evaporates. You can distinguish between the types of smoke and these features.

What is the exhaust?

If the car's engine and everything elsethe equipment is working properly and functions in its normal mode, then the exhaust is a steam connection. Also in gases contains nitrogen and carbon dioxide. These substances are almost completely discolored.

From the tube goes an invisible stream. The catalyst, in which harmful substances are neutralized, is involved in the purification. Let us consider in more detail the white smoke from the exhaust pipe, the causes of this phenomenon, and the ways to solve this problem.

Condensate evaporation

If the driver suddenly noticed that in the processwarming up, or if the white exhaust comes out of the pipe during acceleration at low speed, then, as mentioned above, there is no need to panic. This is a frequent and innocuous phenomenon. The reason is that after a last trip in the combustion chambers, as well as in the resonator and muffler, due to cooling, a lot of condensate formed. When the engine is started, the water defrosts and boils. As a result, the "white" smoke from the exhaust pipe goes on. Then, after a while, all the condensate boils away, and the steam no longer goes.

Antifreeze in the exhaust manifold

If the street is warm, and the pipe is pouring white smoke and does not disappear after warming up, it indicates problems in the engine.

Coolant enters the combustion chambers. Antifreeze during the combustion of the fuel evaporates, and at the output of the muffler a thick white smoke forms. But the color, as already noted, can depend on the type of antifreeze.

Diagnosis: water or antifreeze?

To fully verify that the pipe is coming fromnamely steam, and not evaporating antifreeze, you can conduct a small experiment. To the exhaust close with the engine wound up, bring a piece of thick paper. It should not leave any greasy stains. If so, then it is water vapor. If the stains remain, then this is the cooling liquid. Further conduct additional actions, which will allow a more accurate diagnosis.

Unscrew the expansion tank cap, thenstart the motor. Now you need to spot oil spots on the surface of the coolant. It is recommended to check the smell of antifreeze - it can smell of waste gases. If a characteristic oil film is visible on the surface of the coolant and the antifreeze smells of the exhaust gases, this indicates a broken gasket under the cylinder head. Also, a crack in the cylinder is possible. If this is the case, the coolant level in the reservoir will rise. The pressure will increase due to the ingress of exhaust gas into the cooling system. As a result, there is white smoke from the exhaust pipe, but "on the hot". After each trip on such an engine, you can see how quickly coolant decreases. Leakage of the antifreeze and its subsequent entry into the cooling system or into the drip tray leads to the mixing of antifreeze and oil. You can diagnose by the color of the grease. On the probe, it will have a milky color. To use such an oil is already unsuitable. Lubricating properties it completely lost.

Other reasons

If there is white smoke from the exhaust pipe, the causescan be in a burnt gasket. However, the problem is not only in the gasket itself, but also in the head, or rather in its plane. This defect is often expressed when the motor overheats. However, at a stage when the violation of the CBC plane is not yet so pronounced, it is not noticed. In this case, one should observe the combustion chamber - there is a probability of detecting a crack.

It can be identified when checking the tightness. Perform such a test is easy. The piston is lowered to the bottom dead center and it is determined whether there is a liquid inside. It can be found quite rarely, but mindfulness in this matter will not be superfluous. Often, white smoke from the exhaust pipe (VAZ-2170 including) can be seen when a low-quality gasket of the intake manifold was used at the maintenance. In this case, moisture enters the combustion chambers through the intake system. This option is the worst, since it is very difficult to diagnose the problem. In the cooling system there is always a normal pressure, there are no smells of exhaust gases. But in the oil sump, an emulsion is still formed, and the level of the coolant drops. The probe should be checked every two weeks. it secure you from premature failure and problems with the power unit.

And what about diesel engines?

Fuel Injection in a Diesel Engine -it is feeding it into the combustion chambers under high pressure through the nozzles. When the mixture passes through the nozzle, a flare is formed, so that the mixture in the cylinder is divided into small droplets.

Then these particles are heated inside the chamber andactively evaporate. Completely serviceable motor in any operating modes receives an effective sprayed portion of the mixture strictly at the right moment of the compression stroke. The mixture is then ignited by heating. Further, the combination of diesel fuel and air burns, giving off energy. White smoke from the exhaust pipe of the diesel engine goes, despite the difference with the gasoline engine, for the same reasons - this is the increased moisture content in the exhaust system, incomplete combustion of the fuel mixture, cooling fluid in the combustion chambers. And if everything is clear about the condensate, then about the incompletely combustible mixture needs to be explained in more detail.

Incomplete combustion of diesel fuel

White smoke from the exhaust pipe of a diesel engineduring its warm-up occurs if the ignition is not timely. This color speaks of gases, which were supposed to give energy to the piston. This phenomenon is typical even for a working motor.

In the first case, the mixture enters the combustion chambers,then evaporates, but does not completely burn out, since the feed is carried out at a fixed angle. This happens because of the insufficient heat inside the cylinders. If the diesel engine emits white smoke, it reports that the nozzles spray the mixture normally. A delayed outbreak leads to a decrease in temperature, a decrease in the rate of combustion, uniformity. Possible problems with glow plugs, reduced compression, excessive injection pressure, with plunger pairs of a high-pressure fuel pump.

Conclusion

Thick white smoke from the exhaust pipe, if it is not related to the condensate, indicates certain problems in the engine. You should immediately pay attention to this and troubleshoot.

So, we found out the reasons for the appearance of smoke from the exhaust pipe.