Why is the idle speed of a car left overnight very high? And the sound of da da da ?

The high idle speed is caused by the intake air temperature, water temperature, low (it is also possible that your throttle is dirty), the clicking sound is after parking overnight, the oil is returned to the oil pan, the upper part of the engine is not well lubricated and the cold car clearance is large, no problem.

Generally, the idle speed of cold car start-up is very high, which is normal. And accompanying. The engine was noisy.

The temperature of the Wei engine is very low. Then the old viscosity is very thick. The lubrication is not very good.

So the noise will increase. At the same time, the engine heats up quickly. Then when the cold car starts, the car idles high, the water temperature is normal, and later.

The engine idle speed is back to normal.

Summary. In the case of this idle speed, there is this sound disappearing after running, this is a normal phenomenon, the engine speed is relatively low, the engine's valves, including the engine's formal control and adjustment system, will emit this sound, after running up the speed is relatively high, this sound will disappear. This is normal, there is no problem, every engine will have this phenomenon, but some engines are more obvious, some engines are not obvious, this normal use is fine, there is nothing to do.

There is a clicking sound when the car is idling, but does it run?

Hello, don't worry, I can ask for your question, but wait a minute, I need text for about 2 minutes.

In the case of this idle speed, there is this sound after running, this sound disappears, this is a normal phenomenon, the engine speed is relatively low, the engine's valves, including the engine's formal control and adjustment system, will emit this sound to let the jujube mill, after running up the speed is relatively high, this sound will disappear. This is normal, there is no problem, every engine will have this kind of fighting elephant, but some engines are more obvious, some engines are not obvious, this normal use is fine, there is nothing to do.

When you stop at the traffic light and wait for the traffic light, you will return to this shirt with a clattering sound, and when you get fat with the gas pedal, you will pick up the lead and disappear! There has been no such situation before, and there has only been a leak recently!

This friend is normal and there is nothing wrong with it. There is also a guess before the guess, and it is impossible not to have it. It's just that you may not have noticed this sound before, it is impossible not to have this sound, every engine will have a good open, it is impossible not to have it.

Ok thanks.

You are welcome.

Hello. If it is a rhythmic clicking sound, it is generally the solenoid valve of the fuel injector, and the sound is normal. If it disappears sometimes, then it is the solenoid valve of the activated carbon tank that is working.

He will function as soon as there is air in the tank. When there is no air, the sound will disappear. The sound of clicking all the time is the sound of the fuel injector.

is normal,

It is normal for the engine to have a clicking sound when the idle speed is lower than 800, and in the cold state, the valve clearance is large, and the sound of metal knocking is emitted. The solution is: 1. Idle speed means that the ticking sound should be generated by the idle valve, which may be too much sludge on the idle valve, which affects the adjustment of the stroke, and the sound emitted after the solenoid valve afterburner breaks through the restraint; 2. Clean the idle valve, wipe the oil on the valve body when recovering, and then wipe it with paper, don't let the oil be too much; 3. This sound is not present in every new car, but even if there is such a sound, there is no need to worry, this is called "direct injection", which is a unique sound of a direct injection engine.

Direct injection engines are now popular technology for everyone.

The normal sound of idling is the sound of the valve, the injector, the solenoid valve of the carbon canister, and the slight sound at idle is normal, and what you hear is the sound of the valve working, so you don't have to care.

<> "When the car idles and has the sound of Da Kaihong, it is likely that the hunger is due to the sound of the solenoid valve in the engine; Because when the owner starts the engine of the vehicle, along with the engine starting, there is also a valve between the carbon tank and the intake pipe, this valve is opened, and the gasoline vapor and air will be brought into the cylinder for combustion, which will cause the engine to make a clattering sound.

Of course, it may also be caused by the aging of some parts, such as the aging of the foot glue will also cause this sound in the engine, but in most cases the engine may shake, once the shaking occurs, the owner needs to replace the foot rubber in time.

It is also possible that the engine has less oil during use, because the lack of oil or the deterioration of the engine oil will affect the overall lubrication of the engine, so that the engine will also make such a sound during use.

In addition, damage to the half shaft in front of the car can also cause the engine to make such a sound, especially when pressing the accelerator; This sound is usually high-pitched and harsh, and if you hear this sound, the owner needs to drive the vehicle to the repair shop and ask the maintenance personnel to replace the half axle in front of the car.

When the car is idling, when you open the front cover, you will suspect that the car engine has abnormal noise.

On the issue of abnormal noise of automobiles, it is difficult for ordinary car owners to distinguish which ones are abnormal noises and which ones are reasonable abnormal noises. Only nearly 20% of the vehicles that went to the repair shop to detect abnormal noises really had problems. In the case of a turbocharged engine, there is a must be a difference between the sound and the sound of a naturally aspirated engine; Models with engine guards may also make noises due to friction; After some car owners come into contact with different cars, it is likely that due to their lack of understanding of mechanical knowledge, they mistake reasonable abnormal noise as a vehicle failure.

Therefore, learn to distinguish the abnormal noise of the car and avoid wasting time and energy.

The identification of car noise is limited, and it is difficult to use special instruments to measure the sound of the car, and the sound of the car can only be described and compared with the judgment of the sound in daily life. For example, the "rattle" sound caused by the dry friction of the bearing, and the "click" sound similar to the small hammer hitting the cement floor caused by the excessive valve clearance.

1. Correctly distinguish between normal and abnormal sounds.

The vibration of each mechanism in the work of the car will emit a variety of sounds, but the sound does not mean that the car is faulty, in order to avoid unnecessary disassembly, we must first distinguish between normal sound and abnormal noise. The normal vibration sound of each system component (such as the noise on the surface of the engine), the impact sound of the gear when shifting, the air intake sound and exhaust sound of using gas as the working source, and the gear meshing noise are all normal sounds. Abnormal noise (abnormal noise) can be divided into slight noise, general noise and malignant noise according to the impact on the performance of the car.

Slight noise, such as the flashover sound of high-voltage electric leakage, the slight loose sound of rolling bearings, etc., the general volume is small, the degree of wear of the parts is not large, and there is no significant change for a long time, and this kind of fault can still maintain the normal operation of the car without repair.

3. When diagnosing abnormal noise, attention should be paid to creating good auscultation conditions and trying to eliminate the interference of other noises, so as not to affect the accuracy of judgment.

It is best to consciously amplify or reduce the sound, that is, use a screw or other metal rod as a stestological instrument to contact the sound part to amplify the sound, or use a single cylinder fire cut-off to reduce the sound to meet the diagnostic needs. The auscultation site should be kept quiet to minimize human interference.

What is the problem with the "click" sound when the car idles?