1. The car makes a strange noise

Symptom description: when you step on the accelerator or brake, there will always be abnormal noise in some parts of the car body. The sound is not loud, which does not affect normal driving. However, people always worry about where the mistakes are.

Analysis problem: the problem is usually due to the lack of body stiffness, resulting in vehicle deformation in the process of driving, friction or shaking between the door and frame, or friction between steel plates due to some parts of the desoldering.

Some cars are noisy. This is partly related to the shape of the car. There are also some cars whose body parts are not fixed well, which may cause abnormal noise. Tightening the screws can solve the problem.

Solution: first check whether there are fixed objects on the trunk or rear seat that are easy to roll and make sound, and eliminate the noise caused by some fixed objects that are not good.

If it is found that the abnormal noise is caused by the friction between the doors and windows, you can paste adhesive tape on the doors and windows or pad rubber on the friction part, which can reduce or eliminate the abnormal noise, but the result is only temporary, not permanent. If the above problems are not found, we must go to the regular repair shop for maintenance and troubleshooting.

2 engine makes abnormal noise

Symptom description: the possibility of abnormal noise in the engine compartment is relatively high. Most people also judge the abnormal noise in the engine compartment according to the sound source, usually metal piercing or wind howling.

Analysis problem: the abnormal noise in the engine compartment will have a harsh belt whistling, which is generally caused by belt slipping; When the engine is running, there will also be sharp sound of dry friction of metal parts, which is generally the cause of damage to the generator bearing, water pump and power steering pump; If it is the sound of air leakage during engine operation, it may be the leakage or fracture caused by exhaust system blockage and vacuum pipe leakage.

Solution: abnormal engine noise indicates that the technical state of a certain engine mechanism has changed. It is mainly caused by some parts wear or improper assembly adjustment. Some abnormal noise can also predict that the engine will be accidentally damaged. Therefore, when the engine has abnormal noise, it should be repaired in time to prevent the fault from expanding.

It should be reminded that if the engine makes a strange noise, most of the car owners can't solve it by themselves. It's better to send it to the manufacturer for maintenance.

3. Abnormal noise of gearbox

Symptom description: when the car is driving, if there is a "rustle" sound inside the gearbox, and there is no sound after pressing the clutch or accelerator, there will be a similar whistle when shifting.

Analysis problem: if the noise source in driving comes from the gearbox, it may be caused by gearbox bearing or gear wear and bearing spots. The abnormal noise of the transmission during acceleration and shifting may be due to the metal powder contained in the transmission oil, which indicates that the brake belt, clutch and other components in the transmission are excessively worn.

Solution: there are many parts in the transmission, and the causes of noise are complex. When analyzing and judging, we should pay attention to whether it is related to specific speed. For example, some planetary gears have obvious noise at the speed of about 50km / h. whether it is related to some gears is very important for judging the transmission fault. If a gear makes noise, it must be related to the parts that affect the gear transmission; If all the gears make noise, it is often the fault of the constant meshing gear shaft or the lack of oil in the transmission. Especially acceleration and deceleration is an important means to judge whether acceleration and deceleration is effective or not.

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