What should I do if there is an abnormal engine noise? What should I do if there is an abnormal engi

Idle squeaks are likely to be clutch or disengagement bearings. The landlord said that when he stepped on the clutch, it was gone, and it was likely that the disseparating bearing was worn. I haven't changed it, but it may be a bit of a lot of man-hours to dismantle something.

The engine is abnormal, pour some water and try it.

Causes of abnormal engine noise: 1. The foot rubber is aging or loose.

The foot glue is the rubber block between the engine and the frame. Its function is to reduce the vibration and cushioning of the engine when working, and to have the effect of fixing the engine. Once these feet are aged or loosened, the engine will shake, resulting in abnormal noise.

2. The engine lacks cylinders and makes abnormal noise.

Engine cylinder shortage mainly refers to the engine has one or more cylinders are not working normally, which is generally manifested as: the exhaust gas flow of the car has obvious intermittent flow, and the exhaust pipe shakes badly, and the engine can be heard clearly"Sudden protrusions"Or a plop, plop sound. This phenomenon has a lot to do with the failure of the ignition coil.

3. "Knocking on the cylinder" abnormal sound.

Due to poor lubrication conditions, excessive wear of the piston and cylinder wall, resulting in the gap fit tolerance between the piston and the cylinder wall exceeding the normal range, the piston skirt and the cylinder wall collide when the engine is running, resulting in a crisp sound of "bell", which is generally more obvious when running at idle speed or low speed.

4. The mixture is too thick.

When the engine mixture is too thick, the phenomenon is: the engine is not easy to start; After starting, acceleration is difficult, the engine runs unevenly; Black smoke from the exhaust pipe, the engine is accompanied by a "sudden" abnormal sound, and sometimes the cannon is fired (check the transaction price|Matching|preferential policies); Engine power decreases, fuel consumption increases. This is mostly related to carbon deposits, filter blockages, etc.

5. Abnormal sound of timing gear.

After long-term use of gears, coupled with improper gear gap adjustment, gear belt hardening and other reasons, excessive wear will occur, and even the gear teeth will be worn bald in serious cases, and the meshing between the gears will be loose, and the machine will make a "bang, bang" sound when the machine is running.

The engine has an abnormal sound, and go to the four S shop to check it.

The causes and treatment methods of abnormal engine noise.

1.If it is a cold start abnormal sound, this means that the engine will have a great sense of vibration and clicking noise after a long time of stopping, which will make the oil flow back to the oil pan, so the oil pressure cannot be quickly established when starting, and the internal accessories cannot work normally, resulting in the engine.

2.If the engine is not lubricated enough due to the use of unsuitable oil, which causes friction and abnormal noise, in this case, only the appropriate oil needs to be changed.

3.If the belt is not tightened enough, the engine will make a screeching sound. Just adjust the tightness of the belt.

4.If the engine is a backfire fault, it is because the engine valve has too much dirt or carbon deposits, and the engine will produce abnormal noise, and incorrect timing adjustment will produce abnormal noise. Simply clean the valve carbon deposits and adjust the timing.

5.Using mislabeled fuel can cause the engine to vibrate violently and make abnormal noises. Just choose the right label for the fuel.

6.Loose squeak in the external attachments that hold the engine in place or are connected. Tighten the relevant accessories and replace the damaged accessories.

7.When the inlet pipe leaks, the gas will be emitted from the leakage, causing vibration and abnormal noise. First, check the exhaust pipe and replace it if it is damaged.

Can the engine still be turned on with abnormal noise?

When there is an abnormal noise in the engine of a vehicle, the first thing to determine is what causes the abnormal engine noise. If you confirm that there is no danger, you can continue driving, or if you are in danger, you can continue driving, you can slow down and drive slowly to a nearby repair shop for maintenance.

According to the above introduction to the causes of abnormal engine noise, we can know that there are various types of abnormal engine noise. When there is a problem with squeaky noise, we need to determine what the problem is, and then we can deal with it according to the control method. If it's by car,

There are many reasons for abnormal engine noise, and it is best to go to the auto repair shop for maintenance as soon as possible.

1. I will hear the sound of the engine in general. First of all, the problem of the motor air conditioning belt and tensioner can be sprinkled on the belt, if it does not sound, it can be judged that there is a problem with the belt or tensioner. Or professional stethoscopes, iron rods, etc. auscultate crankshaft wheels, air conditioning wheels, motor wheels, tensioning wheels and other swing wheels, pay attention to safety.

2. Check whether there is oil leakage at the front and rear oil seals of the crankshaft, and eliminate the abnormal blowing sound caused by the positive pressure of the crankcase, so as to prevent the oil injection from hurting people when the oil filling port is opened in the third step.

3. When idling and chirping, slowly open the oil filler cap or pull out the oil dipstick to see if it will call again and whether it will suck the oil filler cap. If it is not called, it can be judged that the negative pressure of the crankcase is too large or the quality of the oil seal at the front and rear of the crankshaft is caused by the inhalation and chirping noise from the oil seal.

4. The negative pressure of the crankcase is large: if the negative pressure of the crankcase is large, the oil cap can be sucked or the repair shop measures the negative pressure value, which means that the negative pressure is large. There are 2 reasons, one is that the exhaust valve is damaged, and the other is that the crankcase air supply pipe is blocked.

Generally, the exhaust valve is damaged and replaced. Unclog the crankshaft air supply pipe.

5. Oil seal quality: If the negative pressure value is normal, it is a problem with the quality of the oil seal (the front and rear oil seals of the crankshaft are different).

6. Why does it not sound when refueling at idling: when idling: the throttle opening is small, and the negative pressure behind it is large, in the case of damage to the exhaust valve, blockage of the air supply pipe, and damage to the oil seal, the suction of the crankcase is large, and it will suck air from the oil seal into the crankcase, and chirp.

When refueling: the throttle opening is large, and the negative pressure behind it is small, in the case of damage to the exhaust valve, blockage of the air supply pipe, and damage to the oil seal, the suction power of the crankcase is not very large, and it will not suck air into the crankcase from the oil seal, and it will not chirp.

When the car is found to have abnormal noise in the process of driving, it should be stopped immediately for diagnosis and elimination, if it cannot be determined by itself, it can be determined according to the situation to the nearby car repair shop for professional investigation and maintenance. The engine of the car is composed of multiple parts, and the reasons for the abnormal engine noise may be: 1. If the water pump is abnormal noise:

The abnormal sound of the water pump is mainly caused by the pump wheel bearing of the water pump. Due to the long-term work, the erosion of cooling water and the accumulation of scale caused serious wear and tear of the water pump blade bearings; If the problem cannot be solved for a long time, it is easy to cause complete damage to the water pump, and the water pump cannot work hard, which cannot make the engine water circulate and run, and then affect the heat dissipation of the engine. 2. If it is a timing abnormal sound:

Most of the timing abnormal sounds appear on the timing belt tensioner and timing chain limiter, the main reason is that the tensioner is deformed due to long-term extrusion and wear, and the limiter is worn, which causes the engine to shake, idle instability, easy to stall, and difficult engine speed; In severe cases, the valve will be deformed by the piston due to timing misalignment, and the engine must be overhauled and the engine cylinder head replaced. 3. If the generator is abnormal: the abnormal noise of the generator generally occurs in the loose bearing of the generator, the lack of oil and the relaxation of the generator belt.

The looseness of the bearing can easily lead to damage to the generator, while the slack of the belt can easily lead to belt slippage, insufficient drive, and affect the normal power supply of the generator.

The common causes of abnormal noise of automobile engine are as follows: 1. Engine knocking. The phenomenon is the abnormal sound of the engine making a "bell".

The engine knocks on the cylinder, mainly because of the sound caused by the piston skirt hitting the cylinder wall when the engine is running. It is usually due to poor lubrication conditions. The solution is generally to replace the four sets of the engine.

2. Abnormal sound of intake and exhaust system. For example, an air intake manifold leaks a noise that occurs when idling and intensifies as the engine speed increases. 3. The engine has a "hissing" noise, which is likely to be caused by a problem with the cooling system, resulting in overheating of the engine.

4. The engine has a "squeak" abnormal sound, especially when the air conditioner is turned on. In this case, it is likely that the belt of the engine is slipping. 5. The engine has an abnormal sound of "clicking", which is likely to be carbon accumulation in the engine.

It is recommended to use high-grade gasoline. In reality, there are many types of abnormal engine noises in automobiles. For example, the abnormal noise of the engine during rapid acceleration, the abnormal noise of the engine during cold start, the abnormal noise of the engine in the idle state, etc., should be analyzed differently in each case.

It is recommended to go to a 4S shop or a professional auto repair shop in time to let the maintenance personnel check, and only by determining where the problem is, can the symptoms be repaired.

It is difficult for ordinary car owners to distinguish which are fault noises and which are reasonable noises. Only nearly 20% of the vehicles that went to the repair shop to detect abnormal noises really had problems. Models equipped with turbocharged engines distinguish between sound and natural suction; 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 due to their lack of understanding of mechanical knowledge, they mistake reasonable abnormal noise as a vehicle failure.

Therefore, learn to 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.