What should I do if the car engine is loud?

Here's why:

Without adequate lubrication during cold starts, hydraulic tappets and mechanical rocker arms do not work properly to cause a rattling sound. The oil condition is not right: if the viscosity of the oil is too high or too low, the engine will make noise.

Insufficient belt tightness: The engine squeaks during operation. There is a leak in the intake and exhaust pipes

At the intake and exhaust pipes, gas leaks from the exhaust pipes, making noise. Poor fuel quality: Causes violent vibrations and sounds in the engine.

Loose plastic parts in the engine compartment: Noise from collisions between the engine workshop and the engine compartment.

Almost every car that has been driven for a long time will increase the engine noise and vibration. This will also occur even if you maintain it diligently and replace various fluids in strict accordance with the requirements of the manual. Of course, this phenomenon is easy to explain, the engine will age, and with the aging will definitely bring such and such problems.

Most of the engine vibrations are due to broken foot glue.

Although it is true that the engine body will wear out a little with the increase of years of use, and the accuracy of various fits inside the engine will be reduced, this is far from the level that will cause significant vibration. The engine vibration is intensified, and in most cases it is a problem with the foot glue. The so-called foot glue is called engine shock absorber seat.

In fact, it is a few rubber blocks that are padded between the engine and the metal frame. Because the engine is running at high temperature for a long time, and rubber itself is very sensitive to high temperature, so the aging of the foot rubber is inevitable. The aging foot glue will harden, which will directly cause the engine vibration to be transmitted more into the cabin, and of course you will feel that the engine operation becomes rough, and the noise increases and the vibration increases.

The solution is very simple, just replace the foot glue. But this kind of operation needs to lift the engine, not you can do it alone, you must go to the maintenance shop to do it, and because you have to lift the engine, the labor cost of changing the foot rubber will be higher than the general engine maintenance.

The throttle is too dirty or the fuel injector has carbon deposit.

When there is too much carbon inside the engine, the gasoline sprayed by the cold start injector will be absorbed by a large amount of carbon deposits, resulting in the cold start mixture being too thin, making it difficult to start, and the combustible mixture of the engine is dilute and thick, resulting in idle jitter after cold start. Too much oil will produce greater unnecessary resistance to the crankshaft work, which will affect the output of power, increase fuel consumption, greatly increase the amount of oil entering the combustion chamber, and also increase the carbon deposition in the combustion chamber, increase the resistance of piston movement and reduce the power of the engine; Secondly, if there is too much oil, it will also increase the stirring resistance of the crankshaft connecting rod, and the noise will also increase.

When diagnosing excessive engine noise, the first step is to rule out the noise caused by accessories, such as those generated by air compressors and power take-offs, and do not mistake these noises for engine noise. Remove the accessory drive belt to exclude noise caused by these units. Noise can also spread to metal parts that would otherwise be fine.

Therefore, the use of a stethoscope will help to determine the location of engine noise.

If the noise varies with the speed of the crankshaft (engine speed), the noise may be related to the crankshaft, connecting rods, pistons, and piston pins. If the noise heard varies with the camshaft speed (half speed of the engine), the noise may be related to the valve transmission components. A hand-held digital tachometer can help determine if the noise is related to a component running at the speed of a crankshaft or camshaft.

Engine noise can sometimes be isolated by removing the plunger of one injector at a time. If the noise volume decreases or disappears, then that noise is related to that particular engine cylinder where it is located.

There is no set rule or test method for determining noise.

Engine-driven components and accessories, such as gear-driven fan clutches, hydraulic pumps, belt-driven chargers, air conditioning compressors, and superchargers, can contribute to engine noise. The following information can be used to guide the diagnosis of engine noise:

Main bearing noise.

The knocking noise caused by the loosening of the main bearing can be heard when the engine is under load, and it is loud and dull. If all the main bearings are loose, a loud, short knocking sound will be heard. This percussion sound is regular and varies with the rotational speed.

This noise is loudest when the engine is dragging or driving under heavy loads, and this knocking sound is druffier than the noise produced by the connecting rod. Low oil pressure will also accompany this.

If the bearing is not loose enough to produce a knocking sound on its own, if the oil is too thin or if there is no oil on the bearing, the bearing will produce a knocking noise.

An irregular noise may indicate crankshaft thrust bearing wear.

Intermittent sharp tapping is an indication that the crankshaft clearance is excessive. Repetitive clutch action may cause a change in this noise.

Connecting rod bearing noise.

Excessive linkage clearance can cause knocking noise at various engine speeds, i.e. at idle speed and under load. When bearings begin to become loose, this noise can be confused with the sound of a piston slapping or the noise of a loose piston pin. The volume of noise increases with the speed of the engine.

Low oil pressure will also accompany this.

Piston noise. The most difficult part is to point out the difference between piston pins, connecting rods, and piston noise. A double-click sound caused by a loose piston can usually be heard when the engine is idling. When the injectors of this cylinder are removed, the sound of this knock will change significantly.

However, on some engines, this knocking sound becomes more pronounced instead when the vehicle is driving on the road at a steady speed.

What's the deal with a loud car engine? It is possible that the exhaust pipe gasket of the engine is leaking or the exhaust pipe muffler pad is leaking, so that the movement of the car is large.

The engine of the car is very loud, which is caused by the serious wear of its cylinders, after all, after his steel is worn, the gap is large and the gap is wide, his sound will be louder, and the other is that its exhaust cylinder system may be faulty, and the rupture of the exhaust pipe will also make the sound louder.

As the most important part of the operation of the car, there are many factors that cause its sound to become louder, such as: 1The best way to know whether the noise is normal is if you have heard the noise before, whether the noise you hear is different from what you are used to, and if the whole vehicle looks too loud, it means that there is a problem.

If the car engine is loud, what's going on? If you say that car, it must be your own, and if the time is big, then there must be a possibility of the engine, or the reason for the engine oil.

1. When the engine is running, if there is a dull sound similar to beating, it may be because there is a problem with the cylinder valve.

2. In this case, if you drive the car very fast, the sound will disappear in fast operation. Therefore, once you drive fast, the sound will disappear, and it is most likely due to the problem of the cylinder valve.

3. In addition, check the problem of oil pressure as an elimination. There is also a situation where when you step on the accelerator, there is that kind of thumping leak sound. It is possible that there is a leak from the exhaust pipe, in which case gasoline will be consumed a lot, so it is necessary to check the condition of the exhaust pipe at this time.

The reasons for the loud noise of the trolley engine are: 1. The existence of a variety of common abnormal noises of the engine depends on the speed state of the engine. The abnormal sound is only emitted when it is running at idle speed or low speed, the sound is disordered when maintaining a certain speed, and the short sound is successively emitted when decelerating sharply, and the abnormal hail sound is emitted when the engine accelerates sharply, and there is also a sound when maintaining high-speed operation; 2. The abnormal noise fault of the engine is often obviously related to the working cycle of the engine, especially the abnormal noise of the crankshaft connecting rod mechanism and the valve mechanism is related to the working cycle.

In general, the sound generated by the gap that is not related to the working cycle is mostly faulty in the engine accessories, and if it is a continuous metal friction sound generated by the workpiece that is not related to the duty cycle, it is considered that a part of the rotating parts is faulty; 3. The oil filter is not well sealed, the oil pump cannot pump oil normally when working, a large amount of air is inhaled, and the engine system is not lubricated, especially the hydraulic tappet part of the valve has a metal knocking sound; 4. The oil pump is not working properly, and the oil shall not be sucked in, resulting in poor lubrication of the engine lubrication system; 5. The hydraulic tappet of the valve is partially damaged, and the related system cannot work normally for a long time, and the parts are not lubricated enough, resulting in damage.

1. The screws of the guard plate are loose.

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.

2. The claw pad is aging.

The claw pad is used for the lack of leather resistance 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.

3. "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.

4. Loose accessories in the cabin.

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.

5. The belt tightness is poor.

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.

6. Intake and exhaust air leakage.

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.

7. The oil condition is wrong.

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. Xiao Mu Wu Ba Fu 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 in the operation of the engine, resulting in noise. At this time, you only need to change the oil.

8. 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.

The car engine is too loud. First of all, it is necessary to eliminate the internal production and production of the engine. The external generation of the desktop engine can be Qing Li which removes the engine belt.

Get in the car and go to the test. If the sound becomes quieter. That is, which wheel outside the engine is generated?

Or which rotating part produced it? If the sound does not get quieter. It's generated inside the engine.

Whether the oil has been changed. If the oil is not changed, I can change the brand of oil to test. If you can't change the oil yet.

Make the sound quieter. It may be caused by wear and tear on the internal parts of the engine. Need to use Halal to listen to which part of the noise code is produced?

Go disassemble the engine for inspection. Whether the clearance of each part of the machine is within the standard range, if not within the standard range, the internal parts of the engine need to be replaced.

Many car owners complain that the noise of their cars is getting louder and louder, what is the reason?

The engine is loud, in fact, it is understandable, because if the sound is loud, it may be because your car has a high degree of matching.

Because you sit idle for too long to cause such an effect, it may be because of the poor quality of the oil you choose, and secondly, it may be that the belt is not tight enough.

You can go to the garage and have it checked. Whether it is because the plastic parts in the engine compartment are loose. For example, power belts, generator belts, etc., aging belts or too loose or tight belts will produce abnormal noises.

It may be that there are some problems with the car, or it may be that your usual driving habits are not correct, you can go to the car to do some maintenance and repair, and if there is any problem, repair it in time.

If your car engine is loud, there are two reasons, one is that you may have forgotten to maintain it. You can add some lubricating oil, and another reason is that your engine has a mechanical failure, and it is recommended that you go to a 4S shop to repair it.

You can go to a professional 4S shop to modify the engine, which should alleviate this situation, and you will make yourself have a better driving experience.

If the engine is loud, it will cause some unnecessary effects on yourself, and it is very good to find a professional maintenance master to check it.