There is a deflagration sound in the engine while driving, especially when accelerating, what is goi

The engine deflagration sound during driving, especially the acceleration is obvious, which is the ignition in advance, the engine will cause deflagration and detonation, and there is a fault inside the engine, resulting in abnormal noise during acceleration. It is also possible that the certificate is incorrect, resulting in an early ignition.

The sound of the car deflagrating during driving is similar to the resounding sound of the valve lever, that is, the "Titika" sound. Since most of the new engines use hydraulic tappets, there will be no excessive sound of valve stem clearance, which is actually a deflagration sound. This noise is caused by the use of low-grade fuel.

To eliminate this fault, it is necessary to meet the requirements of high-standard fuel. Nowhere is this more noticeable than on the Cherokee. If the fuel that meets the requirements cannot be purchased for a while, the ignition timing should be adjusted appropriately.

Hope it helps.

If there is a knock, it is generally caused by ignition in advance, check whether the timing is correct, and there is also this phenomenon if you use gasoline with too high a mark.

Hello, the engine has a deflagration sound when the car is driving, this is not a small problem, please don't worry, please listen to me to analyze it carefully.

Deflagration refers to the combustion of gasoline, the mixture of fuel and air in the spark plug during compression.

Compress on your own before. or after ignition, due to carbon accumulation in the cylinder.

increases, forming multiple sparks, sparks forming multiple shock waves, and air hitting each other to form detonation. Knocking is divided into induced knocking and non-inductive knocking, and induction detonation engines usually cause severe vibrations accompanied by metal knocking. The main performance of non-inductive detonation is the increased engine noise.

Whether it is induction detonation or non-induction detonation, there are different degrees of power attenuation, noise increases, and fuel consumption increases. If the situation is serious, it is recommended to repair it in time, and if the situation can be controlled, it is recommended to add an appropriate amount of fuel to the fuel additives, which can effectively remove carbon deposits and solve the deflagration phenomenon.

The sound of the car while driving is similar to the rattle of a ring valve stem. Most of the new engines do not have excessive valve stem clearance, and the actual noise is a deflagration sound. This noise is caused by the use of low-grade fuel.

In order to troubleshoot, we must use fuel that meets the requirements of high grades.

We analyze the specific causes of deflagration as follows:

1.The engine water temperature is too high. If the engine water temperature is too high, it is likely to cause the engine deflagration when the vehicle is driving, so we must always pay attention to the engine water temperature of the car, if there is an engine deflagration phenomenon, first of all, we need to check whether the engine water temperature is too high.

2.Gasoline is added to the wrong model or of poor quality. The quality of gasoline added to our vehicles has a great impact on the engine, and if the gasoline quality is not good, it will also cause the vehicle to produce a deflagration sound when driving.

3.The ignition was too early. If the ignition time is too early, then there will also be a phenomenon of deflagration of the engine when the car is driving, and we usually need to pay more attention to the ignition timing of the car.

It may be caused by excessive carbon deposit, and it must be repaired in time when encountering this situation, or it may be that there is a problem with the spark plug.

It could be due to engine failure, oil leakage, or severe wear and tear on car parts.

The noise of the engine is loud, so there will be such a sound, and if you don't worry, you can drive it to the repair shop for maintenance.

The deflagration sound is similar to the sound of a valve stem, i.e., a "click" sound. Since most new engines use hydraulic tappets, there is no sound of excessive valve stem clearance, which is actually a deflagration sound. This noise is mainly caused by the use of low-grade fuel.

In order to eliminate this failure, it is necessary to use high-grade fuel that meets the requirements. This unusual noise is most noticeable on the Cherokee. If the prescribed fuel cannot be purchased temporarily, the ignition timing should be adjusted appropriately.

Here's why:1Excessive carbon accumulation.

There is too much carbon in the combustion chamber of the engine, and its volume becomes relatively small, resulting in a corresponding increase in the compression ratio. The thermal storage and non-thermal conductivity of carbon deposits allow the combustible mixture to burn prematurely under the action of red-hot heat. At the same time, it will reduce the vortex strength of the mixture at the end of compression, prolong the combustion time, increase the tendency of spontaneous combustion, and easily induce deflagration.

2.The engine overheated.

When the engine is in high power, overload or low-speed continuous driving for a long time, especially in the hot summer, the external temperature is high and the heat dissipation of parts is poor, which is easy to cause the engine to overheat. When the overheating fault is serious and cannot be improved in time, the combustible mixture will be preheated when it enters the combustion chamber, resulting in the local mixture temperature being too high and reaching the ignition point in advance. It will burn on its own before the fuel ignites normally, resulting in a deflagration.

3.Improper use of fuel.

Gasoline that has been stored for too long or is poorly sealed will naturally have a lower octane number and worsening anti-knock performance. If used incorrectly, it is easy to make the mixture incomplete, the first burning part of the mixture expands, compresses the remaining unburned mixture to reach the autoignition temperature, and suddenly all of it catches fire, resulting in high-pressure ** combustion.

Deflagration refers to the self-compression ignition of the mixture of fuel and air during the combustion of the gasoline engine before the ignition of the spark plug during the compression process. Or after ignition, due to carbon accumulation in the cylinder, multiple ignition sources are formed, and these ignition sources form multiple airflow shock waves, and the airflow impacts each other to form detonation. Detonation is divided into two types: felt detonation and non-inductive detonation, and induced detonation usually causes the engine to shake violently, accompanied by the sound of metal knocking.

The main manifestation of non-inductive detonation is the increased engine noise. Whether it is a felt detonation or an inductive detonation, there are different degrees of power attenuation, and the noise and fuel consumption are increased. If the situation is serious, it is recommended to maintain it in time, and if the situation can be controlled, it is recommended to add an appropriate amount of fuel additives such as Mafu multi-way tablets to the fuel, which can effectively clean up the carbon deposits and solve the phenomenon of deflagration.

The problem of the engine is caused by the line, so go to the 4S shop or maintenance plant in time to eliminate hidden dangers, and repair it in time, and pay attention to safety when driving on the road.

This situation may be caused by the wrong engine timing, and I think the car should be taken to the repair shop immediately to get it repaired.

When the clutch release bearing is damaged, the clutch plate cannot be completely disengaged, which eventually leads to an abnormal sound during acceleration.

On the issue of abnormal noise of automobiles, it is difficult for ordinary car owners to distinguish which ones are abnormal noises and which ones are reasonable abnormal noises. Only nearly 20% of the vehicles that went to the repair shop to detect abnormal noises really had problems. In the case of a turbocharged engine, there is a must be a difference between the sound and the sound of a naturally aspirated engine; Models with engine guards may also make noises due to friction; After some car owners come into contact with different cars, it is likely that they lack their own understanding of mechanical knowledge, so they can distinguish the abnormal noise of the car and avoid wasting time and energy.

Second, the identification method of car noise:

In practice, due to the limitations of working conditions, it is difficult to measure the sound of the car with special instruments, and the sound of the car can only be described and compared with the judgment of the sound in daily life. For example, the "rattle" sound caused by the dry friction of the bearing, and the "click" sound similar to the small hammer hitting the cement floor caused by the excessive valve clearance.

1. Correctly distinguish between normal and abnormal sounds.

The vibration of each mechanism in the work of the car will emit a variety of sounds, but the sound does not mean that the car is faulty, in order to avoid unnecessary disassembly, we must first distinguish between normal sound and abnormal noise. The normal vibration sound of each system component (such as the noise on the surface of the engine), the impact sound of the gear when shifting, the air intake sound and exhaust sound of using gas as the working source, and the gear meshing noise are all normal sounds. Abnormal noise (abnormal noise) can be divided into slight noise, general noise and malignant noise according to the impact on the performance of the car.

Slight noise, such as the flashover sound of high-voltage electric leakage, the slight loose sound of rolling bearings, etc., the general volume is small, the degree of wear of the parts is not large, and there is no significant change for a long time, and this kind of fault can still maintain the normal operation of the car without repair.

3. When diagnosing abnormal noise, attention should be paid to creating good auscultation conditions and trying to eliminate the interference of other noises, so as not to affect the accuracy of judgment.

It is best to consciously amplify or reduce the sound, that is, use a screw or other metal rod as a stestological instrument to contact the sound part to amplify the sound, or use a single cylinder fire cut-off to reduce the sound to meet the diagnostic needs. The auscultation site should be kept quiet to minimize human interference.

: 1. The main bearing of the crankshaft rings 2, the connecting rod bearing rings 3, the piston knocks the cylinder in the cold state 4, the piston knocks the cylinder in the hot state 5, and the piston knocks the cylinder evenly in the hot and cold state.

Hello Rapid acceleration with a brush sound may be due to slippage caused by loose belt. Just adjust the belt.

There is a problem with the engine knock sensor and wiring that causes the engine to deflagrate, I hope I can help you

Hello, there is a problem with the engine knock sensor and wiring, which causes the engine to deflagrate.

For your safety, it is recommended that you go to the repair shop for a check-up.

Detonation and deflagration are the same concept, after the spark plug is ignited, before the flame arrives, the rest of the mixture is ignited and ignites on its own, this combustion is deflagration, that is, detonation. Spontaneous combustion is clearly the phenomenon of fuel burning on its own without ignition. So, to put it simply, it was spontaneous combustion that caused the deflagration.

1. Detonation: It is the most important abnormal combustion of gasoline engine, which mostly occurs when the compression ratio is high. When it appears, the engine produces a high-frequency metal knocking sound, so it is also called cylinder knocking.

1. When the detonation is slight, the engine power rises slightly, and when the power and speed decrease, the work is unstable, the engine shakes seriously, and the engine will overheat and emit black smoke.

To put it simply: if it burns normally, the flame should start from the ignition center (spark plug) and spread to the entire combustion chamber at a speed of 30-70 ms.

2. Deflagration: Before the flame comes, due to some reason (such as carbon deposition or low fuel grade, etc.), the cylinder is on fire at multiple points at the same time, the local pressure and temperature increase sharply, the pressure wave is high frequency in the cylinder, and the flame propagation speed is up to 1000m s in strong detonation.