What happens when the golf car is turned off and the radio is still ringing?

After the vehicle is turned off, pull out the key and the radio in the car still rings; It's not harmful to the car, and it's not a big principle problem, but we still have to go back to the 4S shop to check and see the wiring problem.

On this issue, it is difficult for ordinary car 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 must be a difference between the sounds of turbocharged engines and naturally aspirated engines. Vehicles equipped with engine guards may also generate noise due to friction; Some car owners, after coming into contact with different cars, are likely to sound their cars because they don't understand mechanical knowledge, so as not to waste time and energy.

Identification method of automobile noise;

In practical work, due to the limitation of working conditions, it is difficult to measure automobile noise with special instruments, and we can only describe and compare automobile noise by judging the sound in daily life. For example, the sound of dry friction of bearings, the sound of playing golf with valve clearance, etc.

1, correctly distinguish normal noise from abnormal noise.

When the car is working, the vibration of various mechanisms will make various noises, but the noise does not mean that the car 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 and exhaust sound with gas as the working source, and the gear meshing noise all belong to (abnormal noise), which can be divided into slight noise, general noise and malignant noise according to their influence on automobile performance. Slight noise, such as high voltage leakage flashover noise, slight looseness noise of rolling bearing, etc. Generally, the volume is low, the wear degree 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 pay 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 tools to amplify the sound, or use a single cylinder to cut off the fire and reduce the sound to meet the needs of diagnosis. The auscultation site should be kept quiet to minimize the interference of human factors.