Why does the diesel engine of the car emit black smoke when driving, is it the engine?

If black smoke comes out of the exhaust pipe when the diesel engine is working, it is caused by the injection of diesel fuel that has not been fully combusted. Diesel fuel that is not completely burned decomposes and polymerizes to form soot under the condition of high temperature and lack of oxygen in the combustion chamber, and the soot is not pure carbon, but a polymer with a small diameter. This solid soot reacts much more slowly than gasified fuel, and the black smoke is eliminated before it has time to burn.

Therefore, black smoke when the diesel engine is working is a malfunction. This fuel combustion is incomplete, not only causes the fuel consumption of diesel engine to increase, power decreases, and makes piston, piston ring valve and combustion chamber form a large amount of carbon deposit, when serious it will jam piston ring, valve seal is not strict and produces air leakage, it will also accelerate the wear of parts, thereby reducing the service life of the engine, therefore, the locomotive should be eliminated in time when this fault occurs. 1. The fuel supply is too large or the diesel engine is over-loaded 2. The fuel injection advance angle is too large or too small.

3. Poor atomization or oil dripping of the injector. 4. The positioning screw of the plunger sleeve of the oil pump is too long, which blocks the oil return hole on the sleeve, resulting in the oil return hole is not smooth, causing the increase of oil supply, incomplete diesel combustion, black smoke, and may also cause the diesel engine to fail to turn off. 5. The air filter or intake pipe is blocked, so that the amount of air entering the cylinder is reduced, the diesel combustion is incomplete, and the exhaust emits black smoke.

If the injector is normal, the cylinder is compressed well, and the diesel engine emits black smoke at both high and low speeds, at this time, after removing the air filter, the black smoke will disappear immediately, and the air filter needs to be cleaned. 6. The incorrect valve phase, the valve clearance is too large, and the valve cam tip is seriously worn, etc., will reduce the air intake, and the exhaust gas in the cylinder can not be exhausted, resulting in incomplete diesel combustion and black smoke from the exhaust, and the valve mechanism should be checked and adjusted. 7. Poor compression in the cylinder, and the compression resistance is reduced.

This could be due to excessive wear of the piston and liner, excessive wear of the piston rings, or the opening in the same direction, causing the cylinder to leak. At the same time, it may also be that the valve seal is not tight, and there is an air leak. The compression in the cylinder is poor, the temperature at the end of compression is low, and the air leakage reduces the air, and the diesel fuel cannot be completely burned, and black smoke is emitted.

8. The combustion chamber and exhaust pipe have too much carbon deposit, the combustion chamber temperature is too high, the resistance of the intake and exhaust increases, the intake is not sufficient, and the exhaust is not exhausted, resulting in incomplete combustion and black smoke from the exhaust. 9. The diesel brand used is wrong, the viscosity is too large, or the quality of the diesel is too poor, which is not easy to catch fire, so that the exhaust emits black smoke, and the combustion chamber and exhaust pipe are also easy to produce carbon deposits. 10. The diesel engine is poorly lubricated, or the crank connecting rod mechanism is worn too much, and the running resistance increases, which overloads the engine, the diesel combustion is incomplete, and the exhaust emits black smoke.

11. The working temperature of the diesel engine is too high, which reduces the filling density, the air intake in the cylinder is insufficient, the diesel combustion is incomplete, and the exhaust emits black smoke. 12. The plunger parts of the fuel injection pump are seriously worn, which makes the oil supply pressure of the oil pump rise slowly, which affects the normal fuel supply time, prolongs the fuel injection process, and affects the quality of fuel injection atomization, which is a common fault of black smoke from diesel engine exhaust. Therefore, when the oil pump is seriously worn, it should be replaced in time.

Black smoke is actually the manifestation of incomplete diesel combustion, diesel fuel that is not completely burned, cracked into soot under the condition of high pressure, high temperature and lack of oxygen in the cylinder, and the soot is discharged from the exhaust pipe as black smoke! So the diesel engine will emit black smoke. There is a problem with the air intake, as I just said, there is a reason for the lack of air supply, the imbalance between the oil supply and the air supply, and the blockage of the air filter.

The performance indicators of the diesel used do not meet the standard requirements, resulting in poor fuel combustion and black smoke. Secondly, the quality of diesel is not good, which will damage the diesel filter, resulting in the deterioration of the diesel inside the diesel engine, resulting in the phenomenon of black smoke. The fuel tank of the diesel engine is not sealed, and due to long-term contact with the air, it is inevitable that impurities and dust in the air will fall into the air filter.

These particles will cause the air intake to be blocked, and it is easy to cause incomplete combustion when the diesel is burned, which can lead to black smoke from the diesel engine. One of the conditions for diesel combustion is that a combustion environment with a certain amount of pressure is required. However, if the valves, piston rings, etc. are worn, the compression pressure will be insufficient, resulting in the required pressure not meeting the requirements of combustion, and as a result, the combustion conditions will deteriorate, and the diesel engine will emit black smoke.

The long-term use of the diesel engine and some other factors will lead to changes in the shape and volume of its combustion chamber, which will further lead to a decrease in the quality of the fuel and air mixture, and the poor combustion conditions will produce black smoke. If in the normal operation of the diesel engine, the poured diesel is far greater than the amount of oil required by the diesel engine when it is working, this behavior will make the mixture thicker, which can easily cause incomplete diesel combustion, resulting in black smoke.

Car owners can choose better quality diesel, or add diesel additives; Due to the quality of diesel, some magazines will adhere to the surface of the oil pipe of the fuel system, and the oil pipe should be cleaned regularly; When the diesel engine is working in a harsh environment, the air filter should be cleaned frequently; When working in a well-aired environment, you can clean it at regular intervals and replace the air filter regularly. Replace the solenoid valve in time, if the fuel filter is found to be damaged, it should be replaced in time; Reduce the fuel supply and add appropriate diesel fuel to the diesel engine to meet the demand.

The causes and solutions of black smoke from diesel engine exhaust are as follows:

1. The exhaust pipe is blocked.

Solution: The exhaust pipe is blocked by excessive soot and should be removed.

2. The valve clearance adjustment is incorrect, and the valve seal line is not in good contact.

Solution: Valve clearance, valve springs and valve seals should be checked.

3. The oil supply of each cylinder of the high-pressure oil pump is uneven or too large.

Solution: Adjust the oil level so that it is balanced or within the specified range.

4. Fuel injection is too late.

Solution: Adjust the advance angle of the fuel injection.

5. The injector is working poorly or damaged.

Solution: It should be removed for cleaning and inspection.

6. The injector model is selected incorrectly.

Solution: Replace the correct model of injector.

7. The diesel quality is poor or the grade is wrong.

Solution: Clean and qualified light diesel oil should be selected, and it is recommended to use No. 0 or +10 in summer when using diesel number; In winter, choose -10 or -20; In severe cold areas, the number -35 is used.

It could be due to a high concentration of diesel, too much fuel injected into the injector, not enough coolant, a problem with the fuel supply system, or a machine failure. The machine can be checked directly by turning off the ignition, which can prevent black smoke.

It could be that the amount of fuel injected is too large, or it could be a mistake, or it could be that the air intake is not enough, or it may be that there is friction, or it may be that the hardware is damaged. Parts can be replaced, and cars can also be inspected.

In this case, there is a burn of oil, and you can choose to replace it with a new piston ring, which will prevent the oil from entering the cylinder.

The following are the specific reasons for black smoke from diesel engines: 1. The mixture is too thick: it is necessary to check whether the oxygen sensor fails, if the oxygen sensor fails, the vehicle loses the ability to automatically adjust the amount of fuel injection, and black smoke is easy to appear when the accelerator is stepped on deeply.

It is necessary to repair and upgrade the corresponding parts to replace the air filter, fuel injector, valve seal, cylinder barrel and piston matching, oxygen sensor, etc. 2. Too many fuel impurities: If you add poor quality fuel gasoline, it will produce a lot of impurities after combustion.

When refueling, you should go to a regular gas station. 3. The efficiency of the spark plug decreases or fails: the fire dismantling flower plug is a part that ignites the combustible mixture, and if the spark plug is aging, it cannot effectively ignite the gasoline, resulting in incomplete combustion of gasoline.

When this happens, it can only be solved by replacing the spark plug.

1.The main reason for the black smoke emitted by diesel engines is the incomplete conversion rate of diesel during combustion.

2.The main factors include the following:1.

3.Poor diesel quality: The performance indicators of the diesel used do not meet the standard requirements, resulting in poor fuel combustion and black smoke.

4.Secondly, poor diesel quality will damage the diesel filter, resulting in the deterioration of the diesel inside the diesel engine and the production of black smoke; 2.Clogged air intake: The diesel tank is not sealed.

5.Due to long-term contact with the air, impurities and dust in the air inevitably fall into the air filter.

6.These particles will cause the air inlet to be blocked, and the diesel engine cannot provide enough air when burning, which is easy to cause incomplete combustion, resulting in black smoke from the diesel engine; 3.Insufficient compression: One of the conditions for diesel combustion is that a combustion environment with a certain pressure is required.

7.However, if valves, piston rings, etc.

8.If they are worn out, the compression pressure will be insufficient and the required pressure will not meet the requirements of combustion.

9.As a result, combustion conditions will deteriorate and the diesel will emit black smoke.

I don't know if you've ever seen such a situation on the street. A big car drove by, and black smoke billowed from the exhaust pipe. If this is the case in your car and it has a diesel engine, then I can tell you for sure that there is something wrong with your diesel engine.

Why do diesel engines emit black smoke? What to do if a car diesel engine emits black smoke? What is black smoke from a diesel engine?

Black smoke refers to the phenomenon that the diesel engine causes insufficient fuel combustion under certain conditions, and emits a stupid slow black exhaust gas mixed with a large number of black carbon particles. Note: Pay attention to distinguish the color of the exhaust gases.

Light gray is normal, black is black smoke, blue is oil infiltration, and white is exhaust fumes. Different situations have different causes. Under what circumstances does an oil extractor emit black smoke?

1.Acceleration is too fast (more than 2000 rpm); 2.Cold boot; 3.

idle speed (significantly higher than 2500 rpm); 4.Altitude sickness (more common above 4000 altitudes). How to solve the black smoke of diesel engine?

Replacing the air filter twice can effectively clean the oil circuit and reduce carbon deposits. But you don't need to add it every time, unless you sell additives. This solution is only for the poor oil circuit caused by the quality of the diesel.

If the additives do not improve the black smoke situation, you need to check for 4s. The failure and maintenance of diesel vehicle exhaust purifiers and other similar exhaust treatment devices are not bent to discuss the model, because this link only covers up the black smoke of the table, and even makes the owner get sick on the road without understanding the condition of the car, resulting in more and more serious failures.

Under normal circumstances, only the naked eye should not be able to see the smoke color of the car exhaust pipe, if your diesel car appears black smoke, it is likely that the mixture inside the diesel engine is too thick, the mixture is not formed well or incomplete combustion and other reasons, the following are the most common reasons for the black smoke of the diesel engine.

1. The air filter is blocked

Obstruction of the intake air is the most common problem, because too much dust and particulate matter in the air causes the filter element to accumulate more dust and dirt, which increases the intake resistance and leads to insufficient air supply, which also affects the combustion efficiency.

State jujube shed2. Poor oil quality and carbon deposits

If the added diesel is not of good quality, then the mixture will produce carbon deposits after combustion, and the carbon deposits will block the oil path and lead to poor oil supply, which may lead to the mixture being too thick and generating black smoke.

3. Insufficient compression force

After the valves, piston rings and cylinder liners are worn, the compression pressure is insufficient, and the pressure and temperature of the compressed sail cannot meet the requirements, and the combustion conditions of the fuel deteriorate and black smoke is easy to be generated.

4. The injector is not working well

The poor work of the injector is mainly manifested in three aspects: first, the spray quality is poor; the second is insufficient fuel injection pressure; The third is the injector dripping. In all three cases, the fuel cannot be sufficiently mixed with the air in the cylinder to burn completely.

5. The fuel injection pump works poorly

Serious wear of the plunger or outlet valve of the fuel injection pump, and serious wear of the plunger or outlet valve of the fuel injection pump will lead to a decrease in the oil pressure of the fuel injection pump, which will make the pressure of the fuel injection pump relatively lag behind, the fuel injection will be delayed, and the aftercombustion will increase, so the diesel engine will emit black smoke.