How to cure the clatter of the engine, how to clatter the car engine

The engine clattered and repaired? What is the fault of the car engine, the auto mechanic is experienced and answers the doubts.

Hello: There are a lot of solenoid valves on the engine.

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

In general, when the car starts cold, the engine sound will be slightly louder than when the car is hot, as long as the sound is uniform and soft, not harsh. This is due to the fact that the gap between the cylinder wall and the piston is not yet optimally sized during cold driving, and the lubrication of the oil is not sufficient. Usually when the engine block temperature reaches about 95 degrees, the sound will return to normal.

The sound can also be caused by the valve feet and valve guides and hydraulic ejector rods, but there are many reasons for this sound, such as lack of oil and low oil pressure, friction between the valve and the duct and the hydraulic tappet.

It is recommended to go to the 4S or auto repair shop for inspection to confirm the fault.

It should be that the engine oil is not enough, or there is a lack of engine oil, resulting in such a sound, focus on checking whether the engine oil is sufficient.

If the car does not burn the oil, it may be because the fixing screws of the engine itself have been loosened, or the screws inside the engine, or the shaft is damaged.

The car engine has a clattering sound, if the sound is relatively crisp, there is a sound like knocking on metal, for the cylinder knocking sound, it is the sound of the connecting rod hitting the cylinder barrel. This phenomenon is detrimental to the life of the engine, it is recommended to go to the repair shop to let the master check and check.

Hello question, may I ask, when the cold car starts, the engine has a clicking sound, and it won't be long before the sound is gone, what's going on?

Answer hello, the car makes a clicking sound, first of all, you need to observe whether there is a sound in place or a sound when accelerating. If there is a sound in acceleration, first consider whether the fuel is qualified, and the anti-knock performance of the unqualified fuel is too low, which will cause the engine to have a crisp sound. If there is a sound in place, the first thing you need to do is check whether the oil level is normal.

Check if the oil pressure is normal. Check if the engine chain is elongated. After these exclusions, the engine needs to be dismantled to check whether the valve clearance and piston pins are too large.

Hello, if it is said that there will be a clicking sound a few seconds before the cool car taxi in the morning, this sound is normal, because the oil pressure has not been established. The pressure is low for the first few seconds, so the engine will make a squeak and noise.

Question: I checked with the computer today and said that there was a problem with the VVT solenoid valve.

Answer: If the computer detects that the fault is reported, it needs to be repaired according to the fault code; If there is a problem with the VVT solenoid valve, it will cause the VVT wheel to adjust the position improperly, and the chain will make a sound, and it will occasionally be weak to refuel.

The question ran to two repair shops, the questions were different, one said that the VVT and timing chain should be replaced, and the other said that the VVT solenoid valve should be replaced.

Answer: What do you need to look at the fault code? If there is only a single VVT solenoid valve in the fault code, it is recommended to replace the solenoid valve first, and if there are other timing faults, they all need to be replaced for one-time maintenance.

Question: A computer checked out that the VVT solenoid valve was a bit of a hairpin.

Question: If there is no problem with the solenoid valve. Is it necessary to replace the VVT and timing chain?

Question: If there is a problem with the solenoid valve, there is also a problem with the wheel and timing chain, and it is not changed for a long time. What are the consequences?

Answer: If there is a problem with the solenoid valve, it will cause the VVT wheel to work poorly, and after the poor work, he will have abnormal noise or abnormal acceleration. If the chain and VT wheel are not replaced for a long time, the chain will be elongated, and the engine will work poorly after elongation, and the chain will break if it takes too long. After it is broken, the engine needs to be overhauled.

Hydraulic stop in the engine head and excessive valve clearance. Because there will be a certain amount of wear and tear when the engine valves and hydraulic stops. or cold start, the oil pump has not fully established the oil pressure during the cold start, resulting in the lack of lubrication of each component.

1. The clutch sounds;

2. The transmission shaft supports the bearing;

3. Abnormal sound of drive axle;

4. Abnormal noise of the differential;

5. Abnormal tire noise;

6. A certain part of the vehicle loosens the vehicle resonance.

If the car engine is turned on and reduced, then you should pay special attention to whether there is a gear symphony or other problems, then you need to check it thoroughly.

Reasons for the engine clattering:1. Aging or loosening of the foot glue: The foot rubber is the rubber block between the engine and the frame.

Its function is to reduce the vibration and cushioning of the engine when working, and to fix the engine. Once these feet are aged or loose, the engine will shake, and in severe cases, there will be a "click" abnormal sound, which only needs to be replaced with a new foot rubber.

2. The mixture is too thick: when the engine mixture is too thick, the phenomenon is: it is difficult to accelerate after starting, and the engine runs unevenly; black smoke from the exhaust pipe, and the engine is accompanied by a clattering sound; Engine power decreases, fuel consumption increases.

This is mostly related to carbon deposits, filter clogging, etc., and generally does not need to be overhauled.

3. "Knocking cylinder" abnormal sound: due to poor lubrication conditions, excessive wear of the piston and cylinder wall, resulting in the gap matching tolerance between the piston and the cylinder wall exceeding the normal range, and the piston skirt and the cylinder wall collide when the engine is running, resulting in a crisp sound of "da-da-da", which is generally more obvious when running at idle speed or low speed.

The relationship between squeak and squeak and engine speed The presence of most common squeak and squeak in an engine depends on the state of the engine's rpm. The squeak is only there.

2.The relationship between abnormal noise and load There is an obvious relationship between a lot of abnormal noise on the engine and its load, and the method of relieving the load can be taken cylinder-by-cylinder during diagnosis.

3.The relationship between abnormal noise and temperature When the temperature rises, the sound decreases or even disappears. The reason for the sound is the gap between the piston and the cylinder wall.

4.The relationship between squeak and squeak and engine work cycle The squeak and squeak fault of the engine is often obviously related to the work cycle of the engine, especially.

5.The relationship between abnormal noise and engine parts When abnormal noise occurs in the engine, a certain degree of vibration will inevitably be generated, according to the characteristics and parts of the vibration.

The relationship between squeak and squeak and engine speed The presence of most common squeak and squeak in an engine depends on the state of the engine's rpm. The squeak is only there.

2.The relationship between abnormal noise and load There is an obvious relationship between a lot of abnormal noise on the engine and its load, and the method of relieving the load can be taken cylinder-by-cylinder during diagnosis.

3.The relationship between abnormal noise and temperature When the temperature rises, the sound decreases or even disappears. The reason for the sound is the gap between the piston and the cylinder wall.

4.The relationship between squeak and squeak and engine work cycle The squeak and squeak fault of the engine is often obviously related to the work cycle of the engine, especially.

5.The relationship between abnormal noise and engine parts When abnormal noise occurs in the engine, a certain degree of vibration will inevitably be generated, according to the characteristics and parts of the vibration.

One reason is that the viscosity of the oil you use is not enough to cause poor lubrication, and it is generally recommended that you use a 40-grade engine oil. Such as satisfied.

The engine rattle depends on the state of the engine's rpm. The following are the causes of abnormal noise: 1. Abnormal noise only exists when it is running at idle speed or low speed.

The reasons for the sound are: the gap between the piston and the cylinder wall is too large; The piston pin assembly is too tight or the connecting rod bearing is assembled too tightly; The gap between the tappet and its guide hole is too large; The profile of the valve cam is worn; Sometimes the starting grip is loose and the pulley makes a sound (noticeable when the speed changes). 2. Maintain a certain speed when the sound is disordered, and a short sound is made when the deceleration is sharp.

The reasons for the sound are: the camshaft timing gear is cracked or its fixing nut is loose; crankshaft breakage; The piston pin bushing is loose; The axial clearance of the camshaft is too large or its bushing is loose. 3. The abnormal noise still exists when the engine accelerates sharply and maintains high-speed operation.

The reasons for the sound are: the connecting rod bearing is loose, the bearing is burned or the size does not match and rotates; loose crankshaft bearing or bearing burning capacity; The piston pin is broken; crankshaft breakage;

The cause of the oil.

The cause of the oil. Inferior engine oil or not changing the engine oil for a long time, lack of engine oil, etc., can easily lead to increased friction between the valve and the duct and the hydraulic tappet, etc., so that the various sounds in the engine are louder.

The possible reasons why the engine has a clicking sound are as follows:

1. It may be the valve sound of the engine, because the valve parts are excessively worn, resulting in abnormal engine noise.

2. It may be that the pressure of the oil pump is insufficient.

3. It may be the problem of oil viscosity, the oil will become more viscous in winter, and it is not easy to flow and cause abnormal engine noise.

The normal clatter of the car engine is not a fault, if it is too loud, it should be repaired.

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.

The reasons for the high noise of automobile engines mainly need to be investigated from the following aspects:1. Many new car owners suspect that the car engine is making abnormal noises when they idle when they open the front lid after the first warranty inspection service (because they are operating in the cab of the car before going to the service, and they can't hear the click of the engine under the front cover during normal operation).

At the moment, I hear this sound because GM naturally hears the sound of the engine running normally when idling and opening the front cover to find the engine sound. If you can't hear it in the car, don't make it too loud.

Generally the sound of a valve or injector. The canister solenoid valve also has this sound, but the sound is relatively brittle. There is a way to distinguish between them, which is to give some oil at idle and see if the frequency changes.

If the frequency does not change, it is the sound of the solenoid valve, and if the frequency changes, it should be the abnormal sound at the valve. If you can't hear clearly in the car, it's not a big deal. The car will have a corresponding click, one is the sound of the injectors working, the other is the sound of the valve position cavity, and there is a similar sound, which is the sound of the timing chain, but it is not the same as the click, and there is also the sound of glagla.

2.When a normal car starts cold, the engine will be a little louder than a hot car. As long as the sound is even, soft and not harsh, there is generally no problem.

This is because the gap between the cylinder wall and the piston is not yet optimally sized when the car is cold, and the lubrication of the oil is not sufficient. Usually when the engine block temperature reaches about 95 degrees, the sound will return to normal. 3.

Oil causes. Poor oil, long-term oil change, lack of oil, etc. , which can easily lead to increased friction between the valve and the guide and hydraulic tappet, which can make various sounds in the engine louder.

4.If you still feel uneasy after the above investigation, it is recommended to go to the nearest 4S or Qiwu Kongzhou repair shop to check the loss and confirm the cause of the failure.

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