What is the reason for the lack of cylinders and black smoke in the engine? Ask all the big guys.

Vehicle emissions refer to harmful gases such as CO (carbon monoxide), HC+NOx (hydrocarbons and nitrogen oxides), and PM (particulates, soot) emitted from exhaust gases. From January 1, 2004, Beijing will change the exhaust emission standard for motor vehicles from the current Euro I to Euro II, and by 2008, the Euro III standard will be officially implemented. Exhaust black smoke.

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 carry out high-speed maintenance 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.

Blue smoke is emitted from the exhaust pipe, which is caused by a large amount of oil entering the cylinder and not being completely burned. 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, and whether the oil is channeled into the mixture; Wear of the intake valve guide or damage to the seal, oil sucking into the cylinder, and ablation of the gasket near the oil passage of the cylinder head, etc., should be repaired if necessary.

White smoke exhaust Gasoline contains water or cooling water leaking into the cylinder, the engine is overcooled, and the fuel is not completely burned and the formation of white smoke is discharged together with the exhaust gas.

When a car parked in winter or during the rainy season first starts, white smoke can often be seen. It doesn't matter, as soon as the engine temperature rises, the white smoke disappears. This is caused by the condensation of some water vapor in the exhaust pipe and muffler. This condition does not need to be serviced.

Typical exhaust gas is too thick, and the mixture is not fully combusted. Use an x431 computer to detect any problems with the sensor, such as the oxygen sensor on the exhaust pipe.

In addition, if your engine is shaking, it means that your engine is probably out of cylinder. Use the broken cylinder method to check which cylinder is missing. For example:

Which cylinder do you unplug the high line if the engine is not responding. It means that this tank is broken. Opposite.

If the jitter is greater if it is unplugged, it means that it is good.

1. If the oil supply is insufficient and the amount of oil in the cylinder is small, the heat generated by combustion will be reduced, which will not meet the needs of the engine load, resulting in the engine being weak, making the combustion insufficient and emitting black smoke;

2. The spray quality is too poor, when the diesel engine is working, the spray quality of the injector is poor, resulting in a small surface area of fuel injected into the cylinder, a decrease in the binding rate with oxygen, and less heat emitted;

3. Too little air intake, insufficient engine inflation, resulting in the carbon atoms in the fuel can not fully react with the oxygen atoms, so the heat released is reduced, the engine is weak, and the combustion is not sufficient, resulting in black smoke;

4. The influence of ambient temperature, if the temperature is too high, it will cause the engine to overheat, which will affect the inflation capacity of the engine and reduce the engine power. If the temperature is too low, it will cause poor evaporation of fuel in the cylinder, resulting in incomplete combustion, reducing the amount of heat generated, and causing the engine to be weak.

If this is the case with this gasoline engine. This is mainly due to the torsion torque and insufficient power of the engine combustion and poor output. It is caused by more carbon deposits.

It is necessary to clean the throttle and fuel injector, replace the spark plug, and check that there is a lot of carbon in the engine cylinder, which also needs to be cleaned. There is also a need to check the three-way catalytic converter to see if there is a blockage, and there is also a need to use a computer to detect, the air intake sensor, and the data flow of the oxygen sensor to see if there is a problem. There is also a need to check the cylinder pressure of the engine to see if it is relatively low, and it is necessary to check the engine to see if there is a phenomenon of burning oil.

What is the cause of black smoke from the engine

1. The air filter is too dirty, which causes the intake air to be blocked, resulting in too thick mixed air.

It is manifested as weak stepping on the accelerator, even hail deficiency and fire failure, excessive intake noise, muffled engine sound, etc.

Workaround: Replace the air filter.

2. A large amount of carbon deposits remain on the intake valve, and the fuel cannot enter the combustion chamber normally and the intake valve is stuck.

Most of the manifestations are cold starts in the morning, slow starting, and repeated reputations. There is a noticeable "click" sound of the valve. After the car, there is a shaking phenomenon at idle, the engine is weak, the power is significantly reduced compared with before, and there is an irregular "snort" air leakage sound.

The solution: Routine cleaning of the air intake system, especially the intake valve assembly.

3. There is air leakage in the intake pipeline, resulting in insufficient air intake, deviation of the starting opening of the throttle, and inaccurate oil distribution.

It is manifested as the sound of "snort" air leakage can be heard at the engine, the idle speed remains high, the descent is slow, the regular shaking, the phenomenon or signs of stalling when accelerating, the acceleration is slow, and the fuel consumption increases.

Solution: Overhaul the air leakage on the engine intake duct, and regularly clean and maintain the throttle.

What is the cause of black smoke from the engine

4. Exhaust back pressure, exhaust system blockage, resulting in insufficient air intake, insufficient combustion, and excessive concentration of mixed gas.

It is manifested as heavy throttle, accompanied by strong exhaust noise, and even stalling when accelerating sharply, the exhaust is stuffy, and the engine speed rises slowly.

Solution: Overhaul the exhaust system, clean the three-way catalytic, and consider replacing the three-way catalysis as appropriate.

5. The air flow meter is too dirty, and the oil distribution amount is inaccurate due to poor contact and damage, resulting in excessive concentration of mixed gas.

Fuel consumption suddenly increases in a short period of time, acceleration is strong or weak, and the fault light lights are on or off after being lit up, and the above performance is performed throughout the vehicle.

Solution: Look at the air flow meter or inlet pressure sensor fittings and clean or replace them.

6. The fuel injector is stuck and in a long open state, resulting in too thick mixture.

Manifested as an engine with irregular shaking. Fuel consumption increases, acceleration is slow, and exhaust emissions smell of gasoline.

Solution: Clean or replace the fuel injector.

7. The ignition energy of the spark plug is missing, and the cylinder is broken from time to time.

It is manifested as the sound of firing guns at the same time as the engine shakes, the rhythmic shaking of the engine at high, medium and low speeds, the irregular discharge of black smoke, the weak acceleration, and the rapid decline of power.

Solution: Check the spark plug ignition coil and replace it as appropriate.

8. The oil pump or oil pressure regulating valve is damaged, the pressure increases, and the oil supply increases, resulting in the mixture being too concentrated.

It is manifested as a slow cold start, difficult to start, without excessive loss of power, and increased fuel consumption.

Solution: Replace the gasoline filter and overhaul the gasoline pump.

1. Piston rings, cylinder liners, etc. are worn.

After the valve, piston ring and cylinder liner are worn, the compression pressure is insufficient and the oil is channeled up the combustion chamber, so that the normal proportion of the mixture of the cylinder at the end of the compression stroke changes, so that the fuel is burned under oxygen-free conditions, and the combustion process is easy to produce carbon deposits, and the exhaust gas discharged forms a large amount of black smoke.

2. The shape of the combustion chamber changes.

The shape of the combustion chamber is degraded due to the manufacturing quality and long-term use, and the compression gap is too large or too small, and the piston position is wrong, which will change the shape and volume of the combustion chamber, thereby affecting the quality of fuel and air mixture, and making the fuel combustion conditions worse.

3. The injector is not working well.

In the process of diesel engine fuel injection, at the end of each fuel injection, the fuel injection pressure drops, and the atomization quality is poor, so that the diameter of the droplets is 4-5 times larger than the oil droplets in the main injection stage (the volume is about 100 times larger), the evaporation and combustion time of these oil droplets is short, the concentration of surrounding oxygen is low, and it is easy to produce soot. The injector does not atomize, misatomize, or drip oil, so that the fuel cannot be fully mixed with the air in the cylinder, nor can it be completely burned.

The phenomenon of black smoke exhaust caused by the poor operation of the injector is more obvious when the diesel engine is running at low speed, because the intake vortex in the cylinder is weak when running at low speed, the possibility of oil droplets or oil bundles being dispersed by the air flow is reduced and the residence time is longer, and it is easier to form carbon black discharge.

4. The oil supply is too large.

The oil supply is too large, so that the amount of oil entering the cylinder increases, resulting in more oil and less gas, and incomplete fuel combustion.

In addition, excessive workload, poor fuel quality, and low operating temperatures can also cause black smoke from the exhaust. The high-temperature pyrolysis reaction of the fuel in the diesel engine is unavoidable, especially in the diesel engine with spatial mixed combustion, because the high-temperature gas surrounds the liquid oil droplets, creating conditions conducive to the pyrolysis reaction, so a large number of carbon particles are generated in the early stage of combustion. When the diesel engine is burning normally, before the exhaust valve is opened, a large number of carbon particles formed in the early stage of combustion can be basically burned out, and the exhaust is basically smokeless.

It's just that under some unfavorable working conditions, the carbon particles can not be burned in time but agglomerate and adsorb, forming larger soot particles or flocs in the cylinder and during the exhaust process, making the exhaust emit black smoke.