Why does the exhaust pipe in the back of a car smoke?

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Cars are powered by gasoline or diesel combustion. The gases produced after the combustion of gasoline or diesel fuel push the machine to turn, and then drive the wheels of the car to turn, and the car runs. The exhaust gases produced after the combustion of gasoline or diesel must be exhausted from the exhaust pipe, and as soon as the car starts, the exhaust gases are constantly generated, so we see smoke coming out of the exhaust pipe.

You have to look at the color of the smoke, there are three situations:

White smoke is normal.

Black smoke, gasoline burns incompletely, probably you often step on the accelerator.

Blue smoke, burn engine oil. It is very likely that there is a problem with the engine, go to the 4s point to see.

1. Black smoke from the exhaust pipe: It means that the engine mixture is too thick, resulting in insufficient combustion. When the air filter is too dirty, the spark plug is poor, the ignition coil is faulty, etc., it will cause the engine to emit black smoke.

2. White smoke from the exhaust pipe: it means that the injector is poorly atomized or dripping oil makes part of the gasoline not burn; There is water in gasoline; The cylinder head and cylinder liner have cracks that are invisible to the naked eye, and the cylinder gasket is damaged so that water enters the cylinder; The temperature is too low. This can be solved by:

Clean or replace the injector and adjust the injection pressure; Remove moisture from the tank and oil circuit; Do not buy low-cost and low-quality oil; Replace cylinder head gaskets, cylinder liners, cylinder heads.

3. Blue smoke from the exhaust pipe: it means that the engine oil enters the combustion chamber to participate in combustion, the piston ring and the cylinder liner are not completely run-in, and the oil enters through the gap; The piston ring is bonded in the groove, and the cone surface of the piston ring is reversed, losing the effect of oil scraping; The piston rings are worn excessively, and the oil runs into the combustion chamber through the opening gap; The oil pan oil level is too high; The valves and tubes are worn out, and the clearance is too large. This can be solved by:

New cars or overhauled locomotives must run in the engine according to the regulations, so that all parts can be meshed normally; Look at the assembly mark clearly and install the piston ring correctly; Replacement of qualified or oversized piston rings; Find out the reason for the increase in the oil pan oil level and release the excess oil from the oil pan; Reduction of oil in the filter pan; Replace the valve guide.

White smoke comes out of the exhaust pipe, and a large amount of white water vapor can be seen coming out accompanied by unstable engine operation, even if the engine is preheated to the normal working water temperature, a large amount of water vapor is still coming out. The white smoke may be caused by the wear of the gasket of the engine cylinder, which creates a certain gap and causes a large amount of water from the heat dissipation system to enter the combustion chamber. Water cannot be burned, and when heated, water vapor is generated, which comes directly from the exhaust.

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Black smoke from the exhaust pipe indicates that the mixture is too thick and the combustion is incomplete. The main reasons are overload of the automobile engine, insufficient cylinder pressure, low engine temperature, improper adjustment of carburetor, blockage of air filter, individual cylinders not working and ignition too late, etc. When excluding, check whether the choke is fully opened in time, and overhaul if necessary; After the flameout, look at the main nozzle from the carburetor mouth, if there is oil injection or oil dripping, the oil level of the float chamber is too high, it should be adjusted to the specified range, and the main measuring hole should be tightened or replaced; The air filter is clogged and should be cleaned, unclogged or replaced.

The more common exhaust colors are white, black and blue, the same is the car but the exhaust gas of different colors, among the three colors, white exhaust is the most normal phenomenon, which proves that the engine fuel combustion of the car is relatively sufficient, there is no phenomenon, the fuel will pass through the three-way catalytic converter to form water after combustion.

Yes, the blue smoke from the exhaust pipe is caused by a large amount of oil entering the cylinder and not burning completely. Removing the spark plug can reveal significant carbon deposits. It is necessary to check whether the oil level of the dipstick is too high; whether the gap between the cylinder and the piston is too large; Whether the piston ring is reversed; whether the intake valve guide is worn or the seal is damaged; Whether the cylinder head gasket is ablated, etc., should be repaired if necessary.

White smoke from the exhaust pipe is serious when the car is cold, and it will not emit white smoke after the car is hot, a false fault. Cause analysis: This is because gasoline contains water, and the engine is too cold, and the fuel entering the cylinder is not completely burned at this time, 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 and this condition does not need to be repaired.

When driving normally or idling, only the left side has air outlet, and there is a valve at the tail pipe of the exhaust pipe on the right. It is switched off when the rpm is below 2500 rpm in order to provide sufficient back pressure to the engine when revving.

You can learn about "back pressure" in "Exhaust Principle". For example, if you think of the exhaust as blowing into a pipe, if the pipe opening is large, you will feel that the blowing is very easy; And if the opening is small, you will find that the blowing is very good.

In the exhaust system, because the exhaust pipe and the inner wall surface of the muffler are not completely smooth, the high-speed flow of exhaust gas in the exhaust pipe (up to 180 200 m s) will cause friction with the non-plane, and immediately.

At the same time, the pipe bending of the exhaust system, the discontinuity between the connecting pipe and the muffler, and the three-way catalytic converter will also have resistance to the high-speed flow of exhaust gas.

So too low a back pressure will reduce the engine's low-rpm torque.

The exhaust pipe is divided into main and secondary, and only one exhaust pipe works at low speeds. If there is unstable idling, easy stalling, and a bit of meat when driving and accelerating, it may also be a blocked exhaust pipe.

This exhaust pipe has a special butterfly valve inside, like this butterfly valve, its opening, and closing is related to the speed of the engine, if the engine is the whole, a speed pressure is relatively low, like its stacked valve will be closed, so there is only one exhaust pipe smoking.

If this car is in a relatively high-speed operation, then this engine will run at a high speed, and the butterfly valve inside will be opened, so the two exhaust pipes will smoke.

Is there any, I want to know! Car exhaust pipes used to smoke from both, now only one is smoking, why.

The general situation is that the car burns oil. The causes of burning engine oil are intricate, and some are easy to judge and solve, such as excessive oil filling, air filter, machine filter, exhaust gas valve (oil and gas separator, PVC valve) damage, and dirty throttle, basically any auto repair shop can solve it, and the operation is simple. However, the condition of the exhaust valve should not be ignored and should be carefully inspected, and if there is a problem, it should be resolved immediately.

The phenomenon of "burning oil" in the vehicle will damage the vehicle oxygen sensor too quickly, resulting in an increase in carbon deposition in the combustion chamber, unstable idling, weak acceleration, rising fuel consumption, excessive exhaust emissions and other adverse consequences. Extended information 1, the use of high-quality engine oil: the oil is very easy to corrode and aging in a long-term high temperature state, resulting in the thinning of the oil film, which is easier to run into the combustion chamber to participate in combustion, so the use of high-quality engine oil can greatly delay this phenomenon 2, pay attention to the cleanliness of the fuel oil circuit

Fuel is indispensable in the combustion process to produce carbon deposits, and carbon deposits are the root cause of some car failures, such as the aging of valve seals, piston wall clearance, etc., all have a direct or indirect relationship with the formation of carbon deposits, so keeping the fuel oil circuit clean is of great help to prevent burning engine oil, of course, this needs to rely on high-quality fuel additives 3, with the help of external forces: as mentioned above, The cleanliness of the fuel oil circuit and the anti-aging degree of the engine oil are basically the key to determining whether the engine oil can be prevented, so considering the relationship between domestic oil products, it is necessary to use high-quality engine oil and fuel additives to achieve, which is also the key to realizing the solution of burning engine oil without dismantling and repair.

This is because the car has just started, the engine speed is relatively high, and the combustion of gasoline is not very sufficient, so there is more smoke, which is a normal phenomenon, especially in winter.

The smoke color of the rear exhaust pipe is different, the fault is also different, the white smoke is generally nothing, the blue smoke is generally caused by the carbon deposition of the engine, and the black smoke indicates that the mixture is too thick and the combustion is not complete.

White smoke from the exhaust pipe of the car is particularly severe when the car is cold, but this is not the case when the car is hot. In this case, you don't need to worry too much, this is because gasoline contains water, because the engine is too cold, and the fuel entering the cylinder is not completely burned, resulting in fog spots or water vapor to form white smoke, which mostly occurs in winter or rainy season when the car starts for the first time, and there is no need to overhaul in this case, as long as the engine temperature rises, it will disappear naturally.

Blue smoke is usually caused by a large amount of oil entering the cylinder and not being completely combusted, and if the spark plug is removed, serious carbon deposits will be found. At this time, it is generally necessary to check whether the oil level of the oil dipstick is too high, whether the gap between the cylinder and the piston is too large, whether the piston ring is reversed, whether the intake valve guide is worn, whether the sealing ring is damaged or whether the cylinder gasket is ablated, etc., and repair the problem in time after it is found.

Black smoke from the vehicle indicates that the mixture is too thick and the combustion is incomplete. It may be caused by the following four reasons: the oil level is too high, resulting in too concentrated mixture; Vacuum economizer malfunction, resulting in inappropriate thickening of the mixture; The main air volume orifice foam tube is blocked; The air filter is clogged.

When the problem is investigated, it is necessary to check whether the choke is fully opened, when the vehicle is turned off from the carburetor mouth to see the main nozzle, if there is oil injection or dripping, it is because the oil level of the float chamber is too high, it should be adjusted to the specified range, tighten or replace the main measuring hole, if the air filter is blocked, it should be cleaned, dredged or replaced immediately.

Photo by Zhang Xia1) @2019