The car starts the engine and there is no abnormal noise after a while, what is the reason?

1. The engine has abnormal noise symptoms: there are more possibilities for abnormal noise in the engine compartment, and most people also judge that it is the abnormal noise of the engine compartment based on the sound, which is usually a metal screeching sound or a howling sound.

Solution: The abnormal engine noise indicates that the technical status of a certain mechanism of the engine has changed. It is mainly caused by excessive wear and tear of some parts or improper assembly and adjustment.

Some abnormal noises can still predict that the engine will be damaged accidentally, so when the engine has abnormal noise, it should be repaired in time to prevent the fault from expanding. It should be reminded that if it is an abnormal noise in the engine, most of the owners will not be able to solve it by themselves, and it is best to send it to the factory for maintenance.

2. Symptoms of abnormal noise in the door: there are always some abnormal noises in a certain part of the body when driving on the accelerator or brake, the sound is not loud, and it does not affect normal driving, but it always makes people worry a little about the failure of the body.

Solution: The abnormal noise of the door is mainly caused by the lack of lubrication, but it should be judged that it is the door hinge.

The location is also the window regulator, door lock mechanism, handle mechanism, etc. inside the door. If it's a door hinge or a stopper.

Special grease for door hinges and slides can be used, while special grease for door attachments can be used for lubrication of window regulators, door locks, handles, etc.

The engine makes a "hollow knock" and "hollow knock" sound.

This is especially noticeable when the engine is running at low speeds or when there is a sudden change in speed, and it is accompanied by oil burning.

phenomenon. This abnormal sound is caused by the excessive gap between the piston and the cylinder wall, and the impact of the piston on the cylinder wall is increased when the diesel engine is working.

In order to further confirm, it is possible to stop the diesel engine when the temperature is normal, add a little oil to the cylinder liner, wait for 1 minute and then restart, if the sound is weakened or disappears, it proves that the piston hit the cylinder wall. This is because the oil film created by the added oil compensates for the gap between the piston skirt and the cylinder, but the impact sound reappears when the added oil is exhausted, and the way to eliminate it is to change the cylinder liner or piston.

Loose chassis generally occurs in older cars, when the car is driving in bad road conditions, the steering wheel will feel unstable, the bottom of the car will also come out of the abnormal sound, usually the old driver can feel the overall a little loose, when encountering such a situation, it means that the chassis may be loose, and the reasons for this situation are divided into several, only by understanding the reasons, can we better prevent this problem from happening.

The first reason is the aging of rubber parts, we all know that the elasticity of rubber is particularly good, which can buffer the friction between parts and reduce noise at the same time. However, this kind of thing has a lifespan, and it will age after a long time, and the elasticity is not as good as before, so the buffering capacity will decrease, resulting in abnormal noise in each part, so it is necessary to check these rubber parts regularly and replace them in time.

The second possibility is the reason for the shock absorber, the main role of this part is to inhibit **, when the car is driving in the dustpan section, it will have an impact with the road surface, and the shock absorber can well ensure the smoothness of the car, if the shock absorber is damaged, there will be a scoop phenomenon, so that the chassis is loose, so usually check the shock absorber, if there is a leakage to repair in time.

The third is the gap of the parts, that is to say, the ball head may be loose, this part is like the joint of the human body, if the ball head is loose, there will be a large gap between the lever and other connected parts, if the screw will be loose, then the chassis will become loose, so usually check these two parts.

Loose guard screws.

The engine cannot be fixed, and when it is working, it will produce violent shaking and noise. This is one of the more common minor faults, tighten or adjust the screws, and you'll be fine.

The claw pads are aging.

The claw pad is used to support the engine, and it can not work normally after aging, this problem is irreparable, and it needs to be replaced with a new claw pad.

"Tempering" failure.

If the engine makes a "poof" sound, it may be that the engine valve has too much carbon or the valve timing is adjusted incorrectly, as long as the valve carbon deposit is cleaned and the valve timing is adjusted.

Loose cabin fittings.

There are many plastic parts in the engine compartment, such as the engine cover plate, air intake pipe, etc., once loose, it will collide with the engine compartment in the engine studio and make noise, as long as it is tightened, the noise can be avoided.

Poor belt tightness.

When the tightness of the engine belt is not enough, the engine will produce a "squeak" sharp noise during work, and in the face of such a situation, adjust the tightness of the engine belt to avoid noise.

Intake and exhaust leaks.

When there is a leak in the intake and exhaust pipes, the vehicle starts, and the engine leaks gas when the intake and exhaust pipes pass through the intake and exhaust pipes, resulting in vibrations and noise. If you find such a situation, you need to check the intake and exhaust pipes, and replace the intake and exhaust pipes to avoid noise.

The oil is in the wrong condition.

Engine oil is an important component of engine lubrication, and when there is a problem with engine oil, it will affect the normal operation of the engine. Hachi said before that when the viscosity of the engine oil is too high, it is easy to cause problems in the operation of the engine, and the lubrication effect becomes poor, resulting in friction during the operation of the engine, resulting in noise. At this time, you only need to change the oil.

Poor fuel quality.

When poor-quality fuel is used, combustion in the engine will deteriorate, causing the engine to vibrate violently and make noise. Noise can be avoided by replacing it with a better quality oil or matching it to your car.

Why is the engine noisy during cold start?

When the vehicle is parked for a long time and starts, the engine vibrates violently and then makes a "click" sound. This is due to the gravity lubricating oil all flowing to the oil pan, when starting, the oil pump, especially the valve inside the cylinder head, can not immediately give oil pressure, the hydraulic tappet and mechanical rocker arm can not be lubricated enough, can not work normally, so resulting in a clicking sound. At this time, the noise is normal, and when the engine starts for a while, the engine will return to normal and there will be no more violent noise.

Another very common and practical way to reduce engine noise is to install sound insulation cotton.

Engine noise is mainly transmitted to the cab through vibrations such as the hood and front fenders. Therefore, some high-grade sound-absorbing foam can be added to the engine cover, which can not only suppress the vibration caused by the hood, but also absorb a lot of noise, which is very effective.

This situation is normal, just start the oil does not come up, the engine is not lubricated and the sound is relatively loud.

The cam is worn excessively, and the tappet jumps during operation; 2.Excessive valve clearance due to wear or improper adjustment of the valve stem end and adjustment screw or rocker arm causes the swing arm head of the overhead valve to collide with the top of the valve; 3.excessive carbon deposition in the valve guide; 4.

The valve spring seat falls off; 5.Hydraulic tappets or tappets are damaged.

The abnormal engine noise can be roughly divided into abnormal engine noise during cold start, abnormal engine noise during rapid acceleration, and abnormal engine noise when idling.

1. Abnormal noise caused by aging or loosening of the machine foot pad. The foot pad, also known as the chicken paw pad and the tripod, is generally installed in the middle of the engine and the body, connecting the body and the engine, and playing the role of fixing the engine. And its most important role is to play the effect of cushioning and shock absorption.

Once the foot pads are aged or loose, the engine shakes severely, resulting in abnormal noise. Solution: Replace the machine mat.

2. Abnormal noise caused by lack of cylinder in the engine. The lack of cylinders in the engine mainly refers to the fact that the engine has one or more cylinders that are not working normally, and the phenomenon is that the exhaust pipe shakes violently, and there is a "sudden" or "plopping" abnormal sound.

3. The abnormal sound of "bell" is likely to be a cylinder knocking phenomenon. Generally, due to poor lubrication conditions, the piston and cylinder wall are overworn, resulting in the piston skirt hitting the cylinder wall when the engine is running.

To determine where the abnormal noise comes from, what part of it is emitted, you can drive to the car repair place and let him take a look.

Hello, one, check the engine belt. See if there's a problem

Second, check the lower adjustment wheel to see if it is loose

3. If there is no problem with the above, it is recommended to go to the repair shop to test it and find out the reason

What is the reason why the car starts with an abnormal sound and disappears as soon as you step on the clutch?

The car starts the engine with abnormal noise, after a while there is no more, this may be related to the engine lubrication system, when the lubrication system is just started, there is no oil pressure, after the start is completed, the oil pressure is normal, different.

The ringing disappears.

Distinguish between abnormal engine noise and abnormal sound of the rear axle First of all, the car will drive a certain mileage on the flat road surface, so that the working temperature of the rear axle rises to normal, and then when the car makes abnormal noise, write down the speed, after stopping, put the transmission in the neutral position, and then slowly accelerate until the speed of the engine is equivalent to the speed when the abnormal noise occurs, observe whether there is any abnormal noise, and can be repeated several times to determine whether the abnormal noise is caused by exhaust or abnormal conditions of the engine.

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Many people are consulting about various things about cars, and one fan asked: If there is an abnormal noise when the car starts, if you want to know, please take a look at my introduction, I hope it can bring you some help. There are many reasons why a car can make noise when it starts, including low engine temperature, thermal expansion of the car's three-way catalytic converter, and transmission.

Faults, engine belts.

or chain wear, etc.

1.The engine temperature is too low:

When the car starts cold, the engine temperature is too low to work properly. It's normal to have some noise at this time. This is normal, just wait for a while until the engine temperature rises to a normal level.

2.Automotive three-way catalytic converter expands when heated:

When the car starts, there is a sound, which disappears after a while. This situation is affected by the thermal expansion of the three-way catalytic converter of the car, which is also a normal phenomenon and cannot be ignored.

3.Transmission Failure:

One of the causes of car start-up noise includes the failure of the gearbox, which affects the friction of the internal gears and produces noise. The situation is quite complicated and requires a repair shop or 4S shop.

of professional checks.

4.Engine belts or chains are worn.

If the engine belt or chain is worn, it can also cause friction when the car starts or noise that affects the idle rotation. In this case, it is best to replace the engine belt or chain directly for safety reasons.

Loud sounds can be difficult to judge, especially if they can't be heard live. But according to what you said, the vehicle only has abnormal noise at the moment of starting, judging from experience, it is caused by the bad reincarnation of the motor, because when the motor starts, the normal speed reaches 400 rpm The vehicle can start, but as long as the engine is on the car, the idle steering is generally about 800 rpm, and the speed greatly exceeds the speed of the motor.

Questions. The ignition motor is newly replaced.

Second, the flywheel gear ring inside the vehicle gearbox is worn, which is the need to disassemble the gearbox and replace the flywheel disc assembly. 【】

First, the gear of the vehicle starter is worn out and causes this abnormal noise, and if it can be started normally, it can be used persistently.

Dear, hello, the first ignition of the vehicle has an abnormal sound, but the second time is normal, the reasons are as follows.

Hello, dear, the exclusive technician of the car master will serve you, attentively, carefully and attentively answer your car questions, find solutions and solutions to the corresponding problems for you, and will definitely provide you with satisfactory service! Hope mine can help you!

Dear, this question is up to me, it takes a little time to type, please be patient, thank you! 【】

The ignition motor is newly replaced.

Second, the flywheel gear ring inside the vehicle gearbox is worn, which is the need to disassemble the gearbox and replace the flywheel disc assembly. 【】

First, the gear of the vehicle starter is worn out and causes this abnormal noise, and if it can be started normally, it can be used persistently.

Dear, hello, the first ignition of the vehicle has an abnormal sound, but the second time is normal, the reasons are as follows.

Hello, dear, the exclusive technician of the car master will serve you, attentively, carefully and attentively answer your car questions, find solutions and solutions to the corresponding problems for you, and will definitely provide you with satisfactory service! Hope mine can help you!

Dear, this question is up to me, it takes a little time to type, please be patient, thank you! 【】