What s going on with the engine idle buzzing

The engine is already noisy, if it is abnormal, check whether the valve clearance is too large! Also, see if there is any loose belt.

1. Engine knocking. It is a sound similar to metal percussion, which can also be said to be a knocking cylinder, and the cause of failure can be divided into three types:

a. The fuel is unqualified, and the inferior fuel or the fuel with too low grade is used.

b. Engine timing control error, such as ignition advance angle is too large, etc., readjust the timing.

c. If there is too much carbon deposition inside the engine, you can first try the carbon deposition cleaning effect by disassembling it or pulling it at high speed, otherwise you can only clean the carbon deposition by disassembling the engine. Generally, the more serious ones are often accompanied by the more serious situation of burning engine oil.

2. Abnormal valve noise. After the car, the engine "clicks", which is the sound of the valve, especially after the cool car lands, because the oil pressure has not gone up at this time, and the valve has not been lubricated in place, so it will be fine after a while. This can be the case if your car is parked for a long time.

If this sound keeps ringing, it is possible that the valve clearance is too large or there is an oil leak at the camshaft, and the valve clearance needs to be adjusted or the relevant oil seal needs to be replaced. It is also possible that the engine oil used is unqualified, such as the use of thinner engine oil for high-kilometer cars, etc., which can be eliminated by changing the engine oil (how to choose the engine oil can refer to "How to choose the right engine oil").

3. Engine "tempering" failure. When the car slows down and collects the oil, there is a "poof" sound, which may be the engine "tempering" failure, which is usually called the engine "fire", too much carbon deposition on the valve or the wrong timing of the valve will produce abnormal noise, cleaning the carbon deposit on the valve or adjusting the timing of the valve.

4. The engine lacks cylinders, a cylinder does not work, the engine will be unbalanced and produce abnormal noise, and it is also accompanied by the violent shaking of the engine, insufficient power and other faults, which may be the fault of the ignition module, spark plug and fuel injector, and the corresponding accessories can be replaced.

5. The engine timing adjustment is wrong. If there is a mistake when replacing the timing belt, such as the timing adjustment is wrong, there is likely to be a more serious metal knocking sound inside the engine, and its direct impact is the top valve (the valve is crooked), at this time, you can only replace the valve and other related accessories, and the engine needs to be disassembled.

6. The oil has not been changed for a long time. There is no particularly regular sound, but I feel that the engine noise has become significantly louder, and it is very likely that the engine oil has become dirty and deteriorated, and after replacing the new engine oil, the engine noise can be clearly felt to be reduced.

7. The plastic parts in the engine compartment are loose, such as the plastic cover plate on the engine, the engine intake pipe, the air filter shell, etc., and the screws and buckles for fastening related accessories.

The humming sound of the engine compartment is generally caused by abnormal wear or aging of the engine belt or pulley bearing, etc., you can check it.

The automobile engine is the device that provides power for the car, is the heart of the car, and determines the power, economy and environmental protection of the car. According to different power**, automobile engines can be divided into diesel engines, gasoline engines, electric vehicle engines and hybrid engines. Common gasoline engines and diesel engines belong to reciprocating piston internal combustion engines, which convert the chemical energy of fuel into mechanical energy of piston movement and output power to the outside world.

The gasoline engine has high speed, small quality, low noise, easy starting, and low manufacturing cost; The diesel engine has a large compression ratio, high thermal efficiency, and better economic performance and emission performance than the gasoline engine.

Hello, check whether the lower pulley is loose or not.

The causes and solutions of a large hum at engine idling are as follows:

1. If you don't pay attention to maintenance, it may be caused by too much carbon deposition in the machine 2113 (too much carbon deposition in the engine, too much carbon deposition in the throttle, too much carbon deposition in the spark plug, etc.), go to the maintenance shop to clean it.

Second, it may also be caused by poor filtration (the most common is that the air filter is too dirty) to go to the repair shop to clean or replace.

3. Of course, the purity of the car gasoline you use is not enough (because the purity is not enough, the gasoline is easy to form carbon deposits inside the machine, and the gasoline of No. 90 is not as pure as the gasoline of No. 93).

Fourth, the 5261 oil (automobile lubricating oil) of the automobile machine is not replaced in time or the inferior quality of the automobile engine oil will also have such problems.

Fifth, if it is the sound made by the transmission shaft, it may be that the cross joint of the transmission shaft is damaged due to lack of oil, and the transmission shaft can be checked by 4102.

1. The engine oil is not fully lubricated to the engine parts, when the 1653 line is transported for a period of time, the new engine oil can be evenly lubricated to the engine parts. If it is not good after a period of time, it may be that the wear is more serious, and then the inside of the engine is cleaned, so that the wear gap becomes larger, the gap is large, the seal is not good, the engine condition will also deteriorate, there may be internal sound, it is recommended to go to the repair shop to check.

2. The transmission shaft is a rotating body with high speed and less support, so its dynamic balance is crucial. Generally, the transmission shaft must be tested for dynamic balance before leaving the factory, and adjusted on the balancing machine. For front-engine, rear-wheel drive cars, the rotation of the accommodating transmission is transmitted to the shaft of the final drive, which can be several sections, and the joints can be connected by universal joints.

There's a big buzz at engine idling, and if you look at the three engine mounts of your engine, isn't it a little too good? When the engine mount is damaged, the engine and frame are hard connected, so there is a humming sound when the vibration is generated.

Reason: The wheel bearing of the car is worn loose or caused by tire eccentricity.

Testing & Maintenance: If a broken wheel bearing is found, the wheel bearing should be tested for safety to improve the rotation of the wheel. It is normal for the wheels to spin smoothly and not slip to one side.

The wheel bearing can make the wheel rotate freely, and the bad wheel bearing should be replaced before it can no longer be used, so as not to damage the car and cause injury to the car. The piston pin assembly or the connecting rod bearing assembly is too tight, the gap between the tappet and its guide hole is too large, and the valve cam profile is worn. And at different speeds, the sound is discordant.

1. Tire pressure is too high

If the tire pressure of the car tire is too high, the area of the car tire in contact with the ground will be reduced, and it is easy to cause buzzing noise, so you need to adjust the tire pressure of the car when driving, especially if the tire pressure of the car is too high, there will be a risk of puncture, driving safety can not be guaranteed, and if the tire pressure is too high, the comfort will also be affected.

2. Abnormal wear and tear of automobile tires

When the tire is abnormally worn, it is easy to buzz, because the tire is uneven, and the contact area of the ground is different, and the car tire will also rub against the ground, so there will be abnormal noise, if it is because of the abnormal wear of the tire caused by the buzz, the owner needs to deal with it in time to avoid greater car failure caused by the abnormal wear of the car tire.

3. Wheel bearing damage:

Due to the long period of use, the wheel bearings may be worn, and even the buzzing phenomenon will occur after excessive wear.

After the abnormal noise in the car needs to be dealt with in a timely manner, do not drive a car with potential safety hazards on the road, easy to break down, there is no good guarantee for driving safety, in the daily driving process, you need to maintain and inspect the car in a timely manner, find abnormal conditions and repair them in time, if you can't solve it, go to a professional repair shop or 4S shop to deal with it.

When the vehicle starts cold, the oil is not fully lubricated in the various parts, the sound will generally be louder, and so the idle speed will be lowered, the sound will be smaller, if the car is hot for a while, there is a sound, consider whether there is a reason for the aging of the belt parts, including whether the engine is used for too long and other reasons, open the hood, find the sound**, and troubleshoot in time, so that the engine can achieve the best working condition.

If it is buzzing while driving, if it does not sound in place, it means that there is a problem with the wheel bearing, and if it is driving and ringing in place, it is a problem with the engine, and you focus on checking the pulley.

If the engine is noisy and does not last long during a cold start, there is generally no problem, but when the engine starts for a while, the engine will return to normal and there will be no more violent noise. In addition, engine oil, belt tightness, etc. will cause high engine noise.

The reason why the car has a buzzing sound when it runs is that:

1.It is caused by the wear and looseness of the wheel bearings of the car.

2.Caused by tire eccentricity and tire wearing.

Wheel bearing is a simple but important auto part, it can make the wheel rotate freely, and the bad wheel bearing should be replaced before it can no longer be used, so as not to damage the car and cause injury to the car.

The noise of the idle engine and the trembling feeling of the car are caused by the unstable operation of the engine.

The solution is: the throttle sensor device of the automobile engine needs to be cleaned to solve the problem of high noise of the automobile engine. Jitter is caused by engine deflagration, and carbon deposits on the piston can also lead to this phenomenon.

During the start of the engine, there should be no squealing sound in the starting motor; The engine idle speed "sudden sound" is uniform, and there is no abnormal noise; The idle speed is stable at about 850 rpm (please refer to the car manual for the specific stable idle value).

Engine idle buzzing sound Engine idle buzzing sound Reasons for engine idle buzzing sound: 1. The noise of the idle engine and the trembling feeling of the car are caused by the unstable working of the engine; 2. Check whether the cylinder pressure, ignition spark energy, throttle sensor, idle motor and engine pad are normal; 3. It may also be related to air intake. Jitter is caused by engine deflagration, and carbon deposits on the piston can also cause this phenomenon.

If you can hear a sound while driving, it means that the steering oil is too dirty or there is a problem with the booster pump.

It is difficult for ordinary car owners to distinguish which are fault abnormal noises and which are reasonable abnormal 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 are different; 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.

How to identify the sound of a car:

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 high-voltage electric leakage of the flashover, the rolling bearing slightly loose sound, 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.

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.

It's time to clean the throttle, last month my car had this problem, occasionally idle shivering, sometimes the drive is not smooth, idle off, all the warning indicators are on, go to the 4S shop to clean the throttle after the problem is solved.