Reason: In this case, we should pay attention to check whether the sunglasses nose frame in the storage compartment, the inside of the hand-held box and the glasses box will ring, and whether the wires of the newly installed driving recorder are loose.
This abnormal sound inspection method: make a fist with your hand and knock on some parts of the car. When there is a knocking sound in a certain part, make sure that there is something around the whole part nearby, take it out or fix it one by one, and confirm it by knocking. If the sound disappears, it means that what you take out or fix is the source of the abnormal sound.
2. The second case: if there is abnormal noise at both low speed and high speed, and the faster the speed, the faster the frequency, which means it is related to the transmission mechanism, so it is necessary to check the transmission parts outside the car, such as tires and cages.
Cause: This kind of noise is accompanied by transmission or vibration, which is different from the fragmentary clicking sound in the car. It's easy to see the difference. Go to the repair shop to confirm and turn the tire over on the shelf.
3. The third case: it has nothing to do with the speed, and the noise is irregular, like knocking outside the car.
Reason: In this case, you should pay attention to dealing with scattered items around the door frame and trunk, or check the chassis of the car. Check whether there are fallen leaves or sundries under the front windshield that are blown up by airflow to produce knocking sound, or whether there are shaking knocking sounds of scattered objects at the bottom of the car body or the trunk (such as water bottles or sundries shaking in the trunk); Or there are plastic bags or other sundries hanging under the car.
4. The fourth case: the vehicle with turbine hisses when accelerating.
Cause: The sound of turbocharging in this case. Under normal circumstances, racing cars will deliberately amplify this sound, which will make racing drivers feel very exciting.
5. The fifth case: After stopping and turning off the engine, you will hear a regular hiss from the engine compartment, like tire exhaust, but it is very regular.
Reason: This kind of sound is the sound of pressure relief from the oil pump, especially for T (turbocharged) and direct injection vehicles. Can be ignored.
6. The sixth situation: when idling, stand in front of the car and make a sound with the engine speed.
Reason: If you change the motor pulley, or if you haven't changed the motor pulley for more than 80,000 kilometers, you should go to the repair shop to check the motor pulley. It is likely that the motor pulley is aging or just replaced unqualified.