Why does the car make a clicking sound when it starts cold?

When the vehicle is started, the engine squeaks because of the engine belt.

Caused by slippage. The clatter sound of the vehicle's engine when it starts cold, is the sound of the gap between the oil flowing back into the bottom pan after the vehicle has been stopped. There is a whining sound after the cold start of the engine, because the engine has selected a new idle speed control, and after starting, some gas will be burned in it to achieve preheating, so it is relatively normal to make such a sound.

The vehicle can start with a squeak and the engine belt slips

If you get this sound when you start it, but it disappears after starting, it's because the engine belt is slipping. You can check whether there are cracks in the appearance of the belt of the engine, in addition, we also have to check how tight this is. If this sound is only made when the weather is cold, or when the temperature drops suddenly, this is normal.

The car made a clicking sound, which was a gap sound

This kind of sound generally occurs after a long time of parking, the sound is relatively sharp, and the duration is relatively short, which is a relatively normal situation. After stopping, the oil is returned to the oil pan, the hydraulic oil passage of the engine is not filled with oil, and there is a sound between this tappet and the mechanical swing, which is what we hear. If the sound does not go away after starting, it is recommended that you go for some professional testing.

The car whined, it was the sound of gas burning

In order to improve fuel economy and engine efficiency, many machines use a 4-2-1 exhaust pipe. Normally, 20 seconds after the engine starts, there is a new idle speed control, and a small part of the gas mixture is burned in it to achieve rapid catalysis. Therefore, it is relatively normal to have this whining sound, if you find such a sound, don't worry, judge the difference in sound, and then choose a different method.

I think this may be due to the fact that when the car engine is cold started, the oil pump can not establish the oil pressure at the first time, and the oil film will be formed between the hydraulic parts, and the hydraulic iron column and the mechanical rocker arm will have a certain valve clearance, which will make a clicking sound, if the engine has been making abnormal noise, you must go to the repair shop for maintenance in time.

This is due to the mechanical friction sound of the upper parts of the engine that are not lubricated.

I think it may be that the timing belt of the car is broken or burr, and it is necessary to check whether the position of the starter of the car is out of position and whether the link starter is aging.

The car makes a clicking sound when it starts cold, probably because the gears inside the starter have lost their lubrication. Once the phenomenon of astringency and jamming occurs, it is likely to affect the timely return of the gear. In this case, be sure to drain oil on it to make it lubricating.

Parts should also be maintained in time, otherwise there may be certain problems when used. The engine oil should be used to match the car, and you can't covet some cheapness. Cheap oil can cause constant rust on people's homes, and it may also cause some problems in the car itself.

The abnormal noise of the cold start requires the car to be parked for a day, and the lubricating oil of the engine will basically flow into the oil pan. When starting the engine, the oil pressure may not be established at the first time, but after a period of time, a certain oil film will form. Inside the oil pan, the oil temperature rises constantly, and there may be a clattering sound.

During the parking process, you can choose to put your car in the underground garage, where the temperature is relatively low. Even if an oil film is formed, it can be dissipated in time during the start-up process. The oil pan should be treated in a timely manner, otherwise the oil will gradually be sealed.

Some people don't go to the car wash for a long time, and there will be dirty things inside the starter to block. In this process, the engine should be turned on in time and gently wiped with a rag. There is a high chance of rust in some areas, which can affect the operating status of the starter.

It is best to make an adjustment to these rusty things, and use a brush to remove the rust stains on them. <>

In general, the car is not able to make any abnormal noise, which will affect the operation of the car. The speed is getting worse and worse, which can lead to a shorter life of the car. In severe cases, not only will you hear a sound, but there may also be other problems.

The car should be sent to the 4S shop for maintenance in time, so that the car can be used for a longer time.

This may be a problem with the throttle, and it may be caused by severe carbon deposits on the throttle.

It may be said that the shelf of the car is not very good, so there will be some sounds like this, which makes people feel very bad.

When the vehicle is started, the engine heats up, so the coolant starts to thaw, so there is a crackling sound.

This may be due to the fact that the oil is not fully lubricated, or it may be due to the damage caused to the engine by slamming on the accelerator during start-up.

It is because the oil is not fully lubricated, and it is easy to dry grind and have a collision sound when stepping on the accelerator, and after the oil is lubricated, there will be no such sound.

Why does the car make a clicking sound when it starts cold?

This is the variable valve timing system of the vehicle, the oil valve can not seal the oil, which leads to the fact that there is no oil pressure in the camshaft during cold start, and the variable timing system cannot fix the camshaft position, so the camshaft has flutter, resulting in the sound of hitting the valve ejector rod, and the variable valve oil valve can be replaced, and the specific operation steps are as follows: 1. Press the sensor plug clip. 2. Unplug the sensor.

3. Remove the fixing screws of the transmitter. 4. Remove the sensor. 5. Install the new sensor and you're done.

When the car is in a collision or cold state, due to gravity, the oil is in the oil tank and has not yet come up. At this time, when the engine is started, there is no oil film between the parts, especially the cylinder head, valve and other parts, and there will be abnormal noise without lubrication. If there is a problem with the timing chain and the maintenance is not timely, the car can not continue to drive in this state, and it is easy to jump the chain, which will not only cause the car to make a sound during driving, but also lead to an increase in fuel consumption of the car, resulting in a decrease in the dynamic performance of the engine.

<> If the chain is severely broken, the car will shake while driving. The cold car starts and makes a strange noise, the hot car does not make a noise, and the cold car starts and the hot car does not make a sound, which may be due to the following reasons: If the owner starts the car cold, he finds that the engine has an abnormal sound of clicking.

The reason could be that all of the engine's lubricating oil flows back into the oil pan. This can easily happen if the vehicle is parked for a day and does not turn on.

When the engine starts, there is no lubricating oil, the oil pump cannot immediately establish oil pressure, and the parts cannot form an oil film. In particular, the valves of the cylinder head need to be lubricated for a cold start. If there is no lubrication, it will cause the valve clearance of the mechanical rocker arm, resulting in a click-and-click sound.

When the cold car starts, the air valve is not opened or the opening is small, which causes the engine to idle at low speed and unstable idle speed when the cold car starts. The snapping sound is usually a sound made by the chain in time. Without lubrication, the timing chain will make a strange sound.

If the timing chain is loose, it will sound strange. It is recommended to go to a 4S shop or a professional auto repair shop in time to check to determine the problem and then correct the symptoms.

There is a relatively loud clicking sound in the cold start, which is mostly a problem with the engine timing system.

In this case, 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 Zheng or shouting cars, they can understand it very well, and mistake the reasonable abnormal noise for a vehicle failure.

Therefore, learn to distinguish the abnormal noise of shouting wild cars and avoid wasting time and energy.

How to identify the sound of a car:

In practice, due to the limitations of working conditions, it is difficult to measure the sound of the car with special instruments, 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 has a fault, in order to avoid unnecessary disassembly, we must first distinguish between normal sound and abnormal sound. 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 is not repaired.

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.