Picking up used car tips to identify nine kinds of "sound for help"

Picking used cars is a science that requires time and experience. It is very difficult for those who usually want to buy used cars to wait for such a long time to accumulate good experiences for themselves, so it is very important to know some practical tips. Today, we found out about the “sound of help” issued by nine kinds of cars. The vehicles that accompany these voices are basically minor problems in one part. We must pay attention to the selection.

First, the impact of sound: a heavier impact on the sound of iron, it is likely that the engine mount due to severe wear and tear for a long time, when the engine speed changes will occur when the impact. But there may also be damage to the front and rear suspensions of the car.

Second, tapping sound: the sound is similar to heavy knock, but the sound should be small. When this kind of sound occurs, the car mainly thinks about whether it uses inferior petrol, and if it uses inferior oil, it can also produce crackling sounds.

3. Tick: It may be that the gimbal of the drive shaft is damaged, or it may be caused by the small stones in the tire hitting the tire or the fan blade bending loose.

Fourth, buzz: Like a balloon leak, most of the cooling system is defective. If the cooling system fails, liquid can be seen at the bottom of the car. In addition, this sound may also occur with large tire air leaks or engine vacuum chamber leaks.

Fifth, re-tap: Like a dull knock. Most of the internal causes of the engine are likely to be due to the aging of the vehicle, and bearing or engine valve damage can also be caused.

6. Howling: Mostly when the car turns, it may be that the fan belt is loose or worn. Sometimes there is not enough gas in the tire and this sound also occurs.

Seventh, squeak: This kind of sound is like the sound of a bee, and its appearance is likely to be a loose part, the plastic or metal parts at the bottom of the engine and the loose support of air conditioners or compressors are the most common.

Eight, roar: From the car with a "squeak" call. It is very likely that the ball bearings in the wheels, in the compressor or in the pump are broken, and it is also possible that the air conditioning or the compressor has failed.

Nine, change tone: The main reason is the uncoordinated sound of motor aging.