The knocking sound of the items in the storage compartment in the car, the items in the glove box, or the wires attached to the electronic equipment. Sometimes this kind of sound will reflect back through the ceiling, and you will feel that the ceiling is making abnormal noises.

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 wiring of the newly installed driving recorder is loose. This abnormal sound inspection method: make a fist with your hand and knock on some parts of the car. When there is noise when knocking on a certain part, make sure there is something around the whole part nearby, take it out or fix it one by one, and then knock for confirmation. If the noise disappears, it means that what you take out or fix is the source of the abnormal noise.

2. The second situation

If there is abnormal noise at both low speed and high speed, and the faster the speed, the faster the frequency, indicating that the transmission mechanism is followed.

Yes, we need to check the transmission parts outside the car, such as tires, ball cages and so on.

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. After confirmation, you can find the tires on the shelves in specialty store.

3. The third situation

It has nothing to do with speed, and the noise is irregular, like knocking at the door 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 by the airflow to produce knocking sound, or whether there are shaking knocking sounds of scattered objects under the car or the trunk (such as water bottles or sundries shaking in the trunk); Or hang plastic bags or other sundries under the car chassis.

4. The fourth situation

Vehicles with turbines hiss when they accelerate.

Reason: This is the sound of turbocharging. Under normal circumstances, racing cars will deliberately amplify this sound, which will make racing drivers feel very exciting.

5. The fifth situation

After stopping and turning off the engine, you will hear a regular hiss in 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 have changed the motor pulley, or haven't changed the motor pulley for more than 80,000 kilometers, you should go to a special store to check the motor pulley. It is very likely that the motor pulley is aging or just replaced unqualified.

7. When turning the corner, there was a bang from the front of the car.

Reason: Generally, there is something wrong with the cage, so we should go to a special store for inspection as soon as possible. This abnormal sound will accompany you.

When you accelerate, you will feel the "Zeng Zeng" friction sound from the front wheels, and its frequency is directly proportional to the speed.