There is a loud creaking sound when stepping on the gas pedal. What happened?
First, the common problems of automobile abnormal noise, it is difficult for ordinary sock owners to distinguish which are faulty abnormal noises and which are reasonable abnormal noises. When I went to the garage to check the vehicles with abnormal noise, only nearly 20% of the vehicles really had problems. There is a difference between turbocharged engines and missing models; For Luheji vehicles equipped with engine guards, chain laughter may also produce noise due to friction; Some car owners may mistake reasonable abnormal noise for vehicle failure due to the lack of mechanical driving knowledge after coming into contact with different cars. Therefore, learn to distinguish the abnormal sound of cars and avoid wasting time and energy.
Second, the identification method of automobile noise:
In the actual smoldering journey, due to the limitation of working conditions, it is difficult to measure the noise of the car with special instruments, so we can only describe and compare the noise and murmur of the car with the judgment of the sound in daily life. For example, the "wow" sound caused by the friction between bearings and socks, and the "click" sound caused by the excessive valve clearance when a small hammer hits the mud floor of the water shed.
1, correctly distinguish normal noise from abnormal noise.
The vibration of various mechanisms in the automobile will make all kinds of noise, but the existence of noise does not mean that the automobile is faulty. In order to avoid unnecessary disassembly, it is necessary to distinguish normal noise from abnormal noise. The normal vibration sound of each system component (such as the noise on the engine surface), the impact sound of gears during gear shifting, the intake sound, exhaust sound and gear meshing sound with chain gas as the working source are all normal noises.
2. Abnormal noise can be divided into slight noise, general noise and malignant noise according to its influence on automobile performance. Slight noise, such as the flashing sound of high-voltage electric socks, slight looseness of rolling and braking bearings, etc. Generally, the acoustic modulus is small, the wear process of parts is not great, and there is no obvious change for a long time. This kind of fault can maintain the normal running of the car without repair.
3, in the diagnosis of abnormal car noise, should arouse attention to create good auscultation conditions, try to eliminate the interference of other noise, so as not to affect the accuracy of judgment.
It is best to amplify or reduce the sound consciously, that is, use a screwdriver or other metal bar as a stethoscope to amplify the sharp sound of the reed, or use a single tube to cut off the fire to reduce the sound to meet the needs of diagnosis. The beam field of auscultation should be kept quiet to minimize the interference of human factors.
Third, the source of abnormal sound:
Abnormal sound source 1: storage compartment. I believe that most car owners have no habit of sorting out storage compartments. Because the car and the password key information bought by children are missing, the storage compartment that has not been sorted for several years must be full of messy items. No matter where the car goes, as long as the engine breaks down, the items in the storage compartment will "jump" with the engine, and the abnormal sound you hear is probably caused by the vibration of the items in the storage compartment.
Abnormal sound source 2: transmission mechanism. In fact, the steam-excited Tantan car will only make a slight abnormal noise if it fails, but how to judge whether the abnormal noise of the car is a fault or a normal phenomenon? It's actually quite simple. You just need to observe that if the noise becomes louder when the speed increases, it proves that there is something wrong with the automobile transmission system. The most effective solution is to see if there is a puncture in the car tire. If so, I suggest you make a phone call to debate or go to a regular car 4S shop for maintenance.
The reed makes abnormal noise, and the excitation source 3: abnormal noise outside the car. If you hear abnormal noise coming from outside the car, you should first check whether the doors and windows of the car are normal and see if there is anything in the trunk. Many times, the collision of objects in the car will also make the driver have auditory hallucinations, and the car will appear because of the broken beam. In addition, you should also check whether there are sundries around the wiper, and clean them up in time if they are scattered, so as not to affect the normal use of the wiper.
Abnormal sound source 4: pulley. If it is found that the car will make a "cough" sound from time to time during driving, everyone should check whether there is any problem with the pulley of the car when the reed spike is balanced. You should know that the service life of automobile pulleys is about eight years. If the car pulley in the carport has not been replaced for more than eight years, it will make a good sound in the cold winter. If the pulley needs to be replaced, Bian Xiao suggested that Daiwa and Daiwa should go to a regular automobile 4S shop to replace the lead pin. Don't do it yourself, or improper operation will cause damage to the car.