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List of contents of this article:

• 1
  、 Why is the start-up noise of the cold car so loud?
• 4、What is the reason for the loud noise of the cold car start engine

What is the reason for the loud start-up engine in winter?

The reasons for the loud start-up sound of the cold car in winter are as follows: Due to the very low temperature in winter, the oil will become sticky and reduce the lubrication effect.

After starting the engine in winter, the viscosity of the engine oil is relatively high, and the engine oil has not yet reached all the parts that need to be lubricated, so the noise of the engine at this time is relatively large. After the engine reaches the normal working temperature, the engine noise decreases.

After starting the engine in winter, the viscosity of the oil is relatively high, and the oil has not yet reached the parts that need to be lubricated, so the noise of the engine is relatively loud at this time. After the engine reaches the normal working temperature, the noise of the engine will become smaller.

What is the reason for the loud noise of the engine shaking when the cold car starts?

1. The cold start noise is very loud, because the engine is not fully lubricated. After the engine is fully lubricated and reaches the normal working temperature, the engine noise will be much smaller.During cold start, the engine oil is in the oil sup shell, with high viscosity and poor fluidity, resulting in insufficient engine lubrication. 99% of engine wear occurs at the cold start time.

2. The cold start is very noisy, because the engine is not fully lubricated at this time. After the engine is fully lubricated and reaches the normal operating temperature, the noise of the engine will be much smaller. During cold start, the oil is in the oil sup shell, which has high viscosity and poor fluidity, which will lead to insufficient engine lubrication. 99% of engine wear occurs during cold start.

3. The loud cold start noise is caused by the fact that the engine is not fully lubricated at this time. After the engine is fully lubricated and reaches the normal working temperature, the noise of the engine will be much smaller.

4. The loud noise of cold start is due to theThe motive has not been affected by sufficient lubrication. After the engine is fully lubricated and reaches the normal operating temperature, the noise of the engine will be much smaller.

5. Analysis of the specific reasons for the loud engine noise: 1. When you step on the accelerator, you will find that the acceleration is not obvious, there is a lack of power, and the engine has a hysterical sound. The most likely time to happen is when the engine is hot, or cold, or when there is a shortage of oil.

6. If the engine is loud and creaks during cold start, then check the use of engine oil. If poor quality gasoline is used, it will also cause the engine power to decrease, resulting in an increase in carbon accumulation inside the engine and the engine noise.

Why is the start-up noise of the cold car so loud?

1. The loud cold start noise is caused by the fact that the engine is not fully lubricated at this time. After the engine is fully lubricated and reaches the normal operating temperature, the noise of the engine will be much smaller.

2. The reason why the cold start sound of the car is too loud: Because of the viscosity of the oil, different grades of oil have different characteristics, and their low-temperature start-up and high-temperature wear resistance and adhesion also have different performances.

3. The reason for the "da-da" sound when the cold car starts Hydraulic support: due to the low oil pressure or the wear of the hydraulic support itself, air enters the hydraulic support, resulting in a "da-da" sound. VALVE GAP: THE VALVE ROCKER ARM IS WORN, RESULTING IN TOO LARGE VALVE GAP.

4. Most of the abnormal noise of air conditioning is caused by the gas and moisture in the air refrigerant components.

5. The reason for the abnormal start-up sound of the cold car may be poor lubrication. When the car engine is first started, the oil has not yet reached the parts that need to be lubricated, and the temperature of the oil is relatively low and has not yet formed an oil film. At this time, the noise of the engine will be a little louder.

6. If the engine is loud and creaks during cold start, then check the use of engine oil. If poor quality gasoline is used, it will also cause the engine power to decrease, resulting in an increase in carbon accumulation inside the engine and the engine noise.

Is it normal to start the engine in a cold car?

It is a normal situation, because when the vehicle starts cold, it will increase the internal wear of the engine, resulting in a loud noise, but it does not affect the use of the motor vehicle. After waiting for a few minutes, the sound will decrease significantly, and the idling speed of the vehicle will return to normal.

This is normal. It takes a process to start the engine oil pressure in a cold car. The lubrication effect is poor, so the noise is loud. In addition, the cold car starts.In order to reach the normal operating temperature as soon as possible, the idle speed of the rear engine will be high, and the noise will be loud, but the noise will slowly decrease as the idle speed decreases until it disappears.

If it is cold start, the engine sound will be quiet, and it will be quiet after a minute, and the sound will be very small when it is hot started, which is a normal phenomenon. Because after parking, the oil in the engine will automatically flow back to the oil san. During the cold start the next day, the oil will slowly return from the oil shell to near the cylinder head.

What is the reason for the loud noise of the cold start engine

1. The loud noise of cold start is caused by the fact that the engine is not fully lubricated at this time. When the engine is fully lubricated and reaches the normal operating temperature After that, the noise of the engine will be much lower.

2. The loud noise of cold start is due to the fact that the engine has not been fully lubricated at this time. After the engine is fully lubricated and reaches the normal working temperature, the noise of the engine will be much smaller.

3. The cold start noise is very loud, because the engine is not fully lubricated. After the engine is fully lubricated and reaches the normal working temperature, the engine noise will be much smaller. During cold start, the engine oil is in the oil sup shell, with high viscosity and poor fluidity, resulting in insufficient engine lubrication. 99% of engine wear occurs at the cold start time.