There is an abnormal noise inside the door of the Changan CX20, and the battery often loses power

1. The existence of common abnormal noises depends on the speed state of the engine.

Squeak and squeak are only present at idle or low speeds.

The sound is disordered when it is maintained at a certain speed, and it makes a brief sound when it decelerates sharply.

Abnormal noises occur when the engine accelerates sharply, and the sound persists when running at high speeds.

Second, the abnormal noise of the engine has an obvious relationship with its load.

A cylinder is fired, and the abnormal noise is suddenly eliminated or reduced. The reasons for the sound are: piston knocking on the cylinder; Loose connecting rod bearings; piston ring leakage; The piston pin is broken.

When a cylinder is fired, the sound is aggravated, or there is no sound at the beginning, but there is a sound at this time. The reasons for the sound are: the piston pin copper sleeve is loose; The piston skirt cone is too large; piston pin out; The connecting rod bearing cover fixing bolt is too loose or even the connecting rod bearing alloy is burned and melted off; The flywheel retaining bolts are too loose.

The abnormal sound of the adjacent two cylinders is reduced or eliminated. The reason for the sound is that the crankshaft bearing is loose.

3. The relationship between abnormal noise and temperature.

The sound is low and the sound is reduced or even disappeared when the temperature rises.

There is a sound when the temperature rises, and the sound decreases or disappears when the temperature decreases.

Fourth, the abnormal noise failure of the engine is often obviously related to the working cycle of the engine.

Usually, the sound caused by clearances unrelated to the duty cycle is mostly due to faulty engine accessories; If there is a continuous metal friction sound emitted by a mechanical part that is not related to the duty cycle, it can be considered that some rotating part is faulty.

5. The relationship between abnormal noise and engine parts.

When the engine makes abnormal noise, it will inevitably produce a certain degree of vibration, and according to the characteristics and location of the vibration, it can assist in diagnosing the cause of abnormal noise.

It is possible that the motor has been short-circuited and leakaged.

Is it the sound of a door lock or a glass regulator?

When ignition, there is an abnormal sound, there are two factors that lead to the first is the elongation of the engine belt, and the second is the starting motor teething, here it is recommended that you first check whether it is the starting motor or the fault caused by the elongation of the engine belt, and the engine belt is recommended to replace it once in 60,000 kilometers.

Hello, I am your exclusive technician, attentive, careful, dedicated to answering your car questions, for you to find the corresponding problem solutions and solutions! The relevant scheme is as follows: when ignition, there is abnormal noise, there are two factors that lead to the first is the elongation of the engine belt mold chain, and the second is to start the horse bureau Dada teeth, here it is recommended that you check whether it is the start of the motor or the failure caused by the elongation of the engine belt, the engine belt is recommended that you replace it once in 60,000 kilometers.

There was a rattling sound after the fire was lit, about 5 seconds.

This sound is the sound of starting the motor.

Starter? Right.

What's going on with the right front wheel rattling.

Walking on flat roads is also loud a lot of the time, and slow driving is the most noticeable.

This is due to the tie rod ball head of the balance bar of the chassis, which is caused by wear and tear on the ball joint, and it is enough to replace the ball joint.

But the wheels don't move.

This ball wheel has no amount of activity.