What is the abnormality of the screeching current sound when the car starts to warm up?

If the vehicle makes an abnormal noise at the moment of cold start, it may be that the carbon brush inside the starter motor is malfunctioning.

The working principle of the starting motor is that after the electromagnet is energized, the gear of the starting motor and the flywheel of the engine are combined and rotated at the same time, so that the engine can be driven to start, and the gear will quickly return to position after the engine starts. This fault is due to the abnormal sound caused by the gear of the starter motor not returning to position quickly, so it is necessary to check the starter motor.

Extended information: Timing belts belong to rubber components, with the increase of engine working time, timing belts and timing belt accessories, such as timing belt tensioners, timing belt tensioners and water pumps, etc., will be worn or aged.

Therefore, all engines equipped with timing belts, manufacturers will have strict requirements, regularly replace timing belts and accessories within the specified cycle, and the replacement cycle is different with the structure of the engine, generally when the vehicle travels to 610,000 kilometers should be replaced.

The specific replacement cycle should be subject to the instructions in the maintenance manual of the vehicle. Timing belts are generally considered to be replaced at 80,000 km. Even if you have a timing belt in your car, you can't replace it if it breaks.

Therefore, when the total distance traveled reaches 80,000, it is recommended to consider replacing it. The timing belt is behind the tank fan.

The reasons for the current sound after the car starts are: 1. If the car does not move for a long time, the oil will return to the oil pan, and the valve lacks the sealing and lubrication of the oil when the vehicle starts, which is a normal situation;

First of all, open the nose cover to observe, if there is a sound of metal wear, it is suspected that the bearing of the rotating part is aging and damaged. If the sound disappears after the car is warmed, it may be that your oil is aging and the parts are oil-free after parking. If there is a sound all the time after starting, and the driving is weak, it is suspected that the piston ring is broken.

If the sound is between the external motor and the fan, it is suspected that the engine drive belt is damaged.

In short, in this case, you should stop the car as soon as possible and tow it to the car dealer for inspection and repair, otherwise, it may lead to a greater failure.

If mine is helpful to you, remember to light it up, thank you!

If you feel that there will be a loud current sound when you start the car, then you should drive it to a 4S shop, after all, it is not a professional, you have to ask a professional to give you identification, otherwise it will be dangerous to drive this car.

When using the car, if you feel the sound of a large electric current, I think you should turn it off again.

When I start the car, I feel a loud electric sound, what's going on? I don't think the sound of electricity can be heard. Although it takes a lot of electricity when starting the car. But when it starts, you also need to use gasoline.

When starting the vehicle, as long as the car is energized, it will emit a zizi current sound, so at this time, the car will have a zizi current sound as soon as it is energized.

1. The phenomenon of Sun Roll is likely to be the sound of the internal machinery of the vehicle rubbing against each other when the vehicle is just energized.

2. It may also be because of a slight short circuit in a certain part of the car, which will not have a great impact on the power at this time.

3. In addition, if there is a lack of oil at the connection or friction part of the relevant parts of the car, it will also make a sizzling sound when the vehicle is energized.

At this time, in order to ensure the normal operation of the vehicle, it is recommended that the owner should carry out a comprehensive overhaul of the vehicle in time after hearing these sizzling current sounds. In this way, it can better ensure driving safety, and pure Kaisen owners do not need to worry about the potential safety hazards of the vehicle.

This is normal, especially now that some models have electric heating devices, so there will be a relative current sound. Or some people mistakenly think that the sound of the pump pumping water is the sound of electricity, and this sound is transmitted to the car and is not much different from the sound of electricity.

Theoretically speaking, it should not be the sound of electric current, it may be the friction sound of each transmission part when starting, especially after the vehicle has been used for a long time, the friction sound of each transmission belt will be greater! It is advisable to observe carefully and deal with it in a timely manner.

After the car was left overnight, the oil on the top of the engine flowed back to the oil pan, and there was no oil film of sufficient thickness, and the oil was not replenished immediately when it was just ignited, and there would be poor lubrication, friction and noise. Cars that use hydraulic tappets do not have enough oil pressure, which can also cause excessive clearance with the valves and produce noise.

It's not normal, anyway, there is no electric sound when my Audi certified pre-owned car starts.