There will be a buzzing sound after the cold car starts, what is going on, the car bought last month

When the vehicle starts cold, the oil is not fully lubricated in the various parts, the sound will generally be louder, and so the idle speed will be lowered, the sound will be smaller, if the car is hot for a while, there is a sound, consider whether there is a reason for the aging of the belt parts, including whether the engine is used for too long and other reasons, open the hood, find the sound**, and troubleshoot in time, so that the engine can achieve the best working condition.

This is the variable valve timing system of the vehicle, the oil valve can not seal the oil, which leads to the fact that during the cold start, there is no oil pressure in the camshaft, and the variable timing system can not 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 sensor fixing screws.

4. Remove the sensor.

5. Install the new sensor and you're done.

It is the "clutch" that is too dirty (greasy), that is to say, the rear oil seal of the engine or the transmission oil seal has oil leakage, leaking to the clutch plate, the weather is too cool (greasy) will "stick" the clutch plate to make it in a semi-linked state, the "card, card" sound is caused by the uneven separation claw, when the temperature rises after a period of operation, the viscous oil becomes thinner, the clutch separation is normal, so the abnormal sound disappears.

When the electronically controlled gasoline injection engine is normal, regardless of whether it is cold or hot, there is no need to step on the accelerator plate and the traditional refueling action (repeatedly press the accelerator pedal) is used when starting, and the starter can be started smoothly. However, sometimes there will be failures that are difficult to start, or even cannot start. Some of the problems lie in the ignition system, some in the fuel system or control system, and some in mechanical failure.

After the occurrence of a difficult to start fault, the approximate location of the fault can be determined by the following methods. - Observe the fault warning light of the engine electronic control system, if there is an alarm, the electronic control system is faulty, the fault code should be called up and the fault should be eliminated according to its instructions. The main components that affect the starting performance are:

Crankshaft position sensors, coolant temperature sensors, air flow sensors, etc. When checking for faults, pay attention to the circuit conduction of sensor circuits and connectors. - Look for the gasoline gauge or the fuel level warning light.

a. There is a clicking sound within half a minute, and then there is no click, which is generally the sound of the expansion of the three-way catalytic converter after being heated, which is normal. b. There is a relatively large clicking sound in cold start, which is mostly a problem of the engine timing system, such as the timing belt chain wear, elongation, loosening or the chain tensioner loses its tensioning function. c. If it is only when the air conditioner is turned on, it may be caused by the friction of the air conditioner belt.

Check whether the timing belt is broken or has burrs.

Pay attention to whether there is a deviation in the position of the starter, or whether the belt linked to the starter is aging and curling.

Check the idle motor.

It's best to determine if it's the noise in the cylinder body, or if not, it's basically related to the starting system of the car.

There are many reasons for this phenomenon. For example, the piston ring is worn or broken, the connecting rod size head shaft sleeve is worn and knocks on the cylinder head, and after a period of time, the temperature rises, which will change the clearance, or the oil is sufficient, so that the phenomenon can be alleviated. It is recommended to send it to the factory for maintenance to avoid the expansion of faults and increase losses.

Hello! If it is from the engine, look at the throttle and idle motor, if not, check whether it is from the starter, other parts to very little, I hope my answer will help you, thank you! [Zhengzhou]--North].

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The abnormal clicking sound when the cold car starts, this situation is more common in more mileage or older modelsPoor unidirectional tooth return of the starter motor and friction with the edge of the flywheel tooth will produce a very harsh sound.

If this sound occurs at the moment of starting, the starting motor can generally be removed for maintenance, the dust and dirt inside can be removed, and the gear mechanism can be refilled with grease, such as carbon brushes.

There is no abnormality, and the fault can be solved after the maintenance of the starting motor.

In addition, the chain tensioner in the engine works abnormally, which may also cause abnormal noise at the moment of cold start, so it is best to let the master actually check it for better analysis.

The reason why there is an abnormal noise when the car starts.

1. The engine temperature is too low.

The car is in a cold start.

, the engine temperature is too low to work properly, and it is normal to have some abnormal noises at this time. This is normal, just wait a while for the engine temperature to rise to normal levels.

2. Three-way catalytic converter for automobiles.

Expansion by heat. When the car is just started, there is an abnormal sound, and it disappears after a while. This situation is caused by the thermal expansion of the three-way catalytic converter of the car, which is also a normal phenomenon and should not be ignored.

3. Gearbox failure.

One of the causes of abnormal starting noises in a car includes a malfunction of the gearbox, which causes its internal gears to be rubbed and produce abnormal noises. This situation is more complicated, and you need to go to the repair shop or 4S shop.

Get a professional to check it out.

4. an engine belt.

or chain wear.

If the engine belt or chain is worn, it will also cause friction during start-up or abnormal noise due to idling, in which case it is best to replace the engine belt or chain directly for safety.

If the engine is too loud during a cold start, it will become quiet after a minute, and very quiet during a hot start, which is normal. This is because when the engine is shut down, the oil automatically flows back into the oil pan.

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. Models equipped with turbocharged engines distinguish between sound and natural suction; Models with engine guards installed may also make noises due to friction; After some car owners come into contact with different cars, they are likely to mistake the reasonable abnormal noise for a vehicle failure because of their lack of understanding of mechanical knowledge.

Therefore, learn to distinguish the abnormal noise of the car 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 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 the method of dismantling and dismantling the single cylinder to reduce the sound to meet the needs of diagnosis. The auscultation site should be kept quiet to minimize human interference.

Summary. Hello dear, there is a buzzing sound when the car starts cold, and this sound comes from the engine starting motor or fuel pump. The buzz produced by the engine starter motor is normal because the starter motor itself is an electric motor, which needs to drive the rotation of the engine, so it will produce a certain buzz at the moment of starting.

Generally, this buzzing sound lasts for a few seconds and then fades away. This is because once the starter motor is stable in rotation, it no longer needs to generate a large amount of power. In addition, a similar buzz is produced when the fuel pump is activated.

When starting a cold car, the fuel pump needs to pump the fuel out of the tank and send it to the engine for combustion. Since the fuel pump is usually located inside the tank, it takes a longer time to work to pump the fuel at start-up. This causes the fuel pump to hum accordingly, which does not fade away until the fuel is delivered to the engine.

If your car has a buzzing sound when it starts cold, and it lasts for a short time and doesn't have a significant impact on the vehicle's work, then it's a normal sound.

Hello dear, there is a buzzing sound when the car starts cold, and this sound comes from the engine starting motor or fuel pump. The hum produced by the engine starter motor is normal, because the starter motor is a motor in its natural state, which needs to drive the rotation of the engine, so it will produce a certain humming sound at the moment of starting. Generally, this buzzing sound lasts for a few seconds and then fades away.

This is because once the starter motor is stable in rotation, it no longer needs to generate a large amount of power. In addition, a similar buzz is produced when the fuel pump is activated. When starting a cold car, the fuel pump needs to pump the fuel out of the tank and send it to the engine to burn the sail rock.

Since the fuel pump is usually located inside the tank, it takes a longer time to work to pump the fuel at start-up. This causes the fuel pump to hum accordingly, and it is not until the fuel is delivered to the engine that the sound fades away. If your car has a buzzing sound when it starts cold, and it lasts for a short time and doesn't have a significant impact on the vehicle's work, then it's a normal sound.

When the car starts cold, there is a buzzing sound on the right side of the engine, and it is gone for about 45 seconds, what is going on?

When the cold car starts, the engine is suspicious of the right, and there is a trembling buzzing sound for about 45 seconds, which is the sound of the car starter, and this sound is normal. If it lasts too long, the starter is abnormal and needs to be replaced.

It's not a turbocharger problem.

No, pro, turbo failures don't make a buzzing sound.

Oh, there was no such sound in the past, and it was quite loud, and it didn't solve it after repairing it a few times, and I changed it to an air compressor.

Pro, no, it is the sound of the starter that lasts for more than 40 seconds, normal.

Summary. There is this phenomenon at the moment of starting, this is normal, because the moment the engine starts at a particularly low temperature in winter, the amount of this ** is relatively large, the combustion is not good, and the oil pressure is not established, and it does not reach a normal lubrication, so there will be this sound, there is no problem with this, and it can be used normally.

Hello, happy to answer your questions.

There was a buzzing sound as soon as the winter car started.

This is normal, because the moment the engine starts at a particularly low temperature in winter, the amount is relatively large, the combustion is not good, and the oil pressure is not established, and it does not reach a normal lubrication, so there will be this kind of sound, there is no problem with this, and the base is not used normally.

See. Oh.

There won't be a problem with the starter.

There is no problem with the starter, there is no problem with this.

Summary. Hello, this problem may be caused by insufficient oil pressure, it may be caused by a clogged oil pump filter, a faulty oil filter, excessive oil viscosity, or a problem with the timing system.

When the car starts cold, it makes a clicking sound, what's going on?

Hello, I have seen your inquiry, please wait for a moment and answer it for you immediately.

It seems that the gearbox rings there, and the hot car starts and cannot be heard.

Hello, this problem may be caused by insufficient oil pressure, it may be caused by the plugging of the oil pump filter, the slag leakage of the oil filter element, the excessive viscosity of the oil, or the problem of the timing system.

The gearbox doesn't ring, it's the engine that appears.

Oooh. Thank you.

Summary. Pro, the cleaning steps of the throttle are as follows:

1. First unplug the wiring harness plug next to the throttle, unscrew the fixing screw with a hexagon screwdriver, and then remove the throttle.

2. Cover the air intake to avoid debris falling into the engine.

3. Spray cleaning agent on the dirt. Be careful not to spray the cleaning agent on the outside of the throttle, and do not break the throttle valve inside, and avoid causing damage to the throttle motor next to it.

4. Finally, it can be dried naturally. It is best not to wipe it with a rag, it is easy to wipe off the lubricating coating on the surface.

5. After installing the throttle back, power off and restart or redo the throttle matching.

There was a buzzing sound as soon as the car started.

Hello dear, there is a buzzing sound immediately after the car starts, which is the sound of the gasoline pump working or the sound of exhaust deflagration

Dear, please describe your specific situation.

Dear, whether there is any abnormality in the ignition and whether there is any abnormality in driving.

After stopping for a few days, the location will buzz open, and after a while, the fire will be restarted.

This is due to the fact that the throttle part has not been cleaned for a long time, and the carbon deposits on the throttle cause the position sensor to jam at the beginning stage.

Dear, you will appear after a long stop.

Dear, cleaning the throttle will solve the problem.

There are no safety hazards.

Dear, no

Dear, this is a minor issue

How to clean? Dear, I'm going to go to the garage and take it down. High-pressure gas rushing.

Pro, the cleaning steps of the throttle are as follows: 1. First unplug the wiring harness plug next to the throttle, unscrew the fixing screw with a hex screwdriver, and then remove the throttle. 2. Cover the air intake to avoid debris falling into the missing bridge engine.

3. Spray cleaning agent on the dirt. Be careful not to spray the cleaning agent on the outside of the throttle, and do not break the throttle valve inside, and avoid causing damage to the throttle motor next to it. 4. Finally, it can be dried naturally.

It is best not to wipe it with a rag, it is easy to wipe off the lubricating coating on the surface. 5. After installing the throttle valve back, power off and restart or redo the throttle valve matching.