How to solve the noisy engine of Changan CX20?

Almost every car that has been driven for a long time will increase the engine noise and vibration. This phenomenon is easy to explain, the engine will age, and with the aging will definitely bring problems of one kind or another.

1. Most of the vibrations are pots with machine 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 solution is very simple, just replace the foot glue. But this operation requires lifting the engine.

2. There is basically no solution to the abnormal noise in the interior.

In addition to the sound of the engine, the most common thing in old cars is all kinds of strange interior noises. Some of the abnormal noises can't be distinguished at all. In most of these cases, it is a problem of abnormal noise in the interior.

Why does the interior make abnormal noise? The interior of a car is made up of many parts, including seats, panels, equipment, and miscellaneous things. These things are basically all screwed or glued in place.

The glue hardens over time, and after hardening, friction between the parts makes a sound. The place where the screws are fixed will be loose for a long time, and there will be abnormal noises if they are loose.

3. Increased wind noise? Check the door seals!

The increased wind noise is most likely to be the fault of the door seals. Quite simply, one of the main functions of door seals is to seal the vehicle and prevent excessive wind noise from entering the cabin. The door seal is also made of rubber, which will harden after a long time, and of course it will not be able to stop the air leakage after hardening.

This is relatively easy to solve, distinguish which side of the door is the most noisy, and replace all the door sealants on that side. It also directly replaced all the sealant strips on all doors of the whole car.

However, there is a certain chance that the wind noise is still so loud after the change, then it is very likely that the sound insulation glue has hardened in places such as wheel arches, engine compartment firewalls or trunks.

Specifically, it is the noise of **, find out in order to deal with the symptoms! There are four "sources" of car noise: engine noise, tire noise, noise in the air, and noise caused by the body structure.

1.Engine noise. In addition to the mechanical sound emitted by the engine block, it also includes the air intake system noise, that is, the high-speed gas enters the cylinder through the air filter, intake pipe, and valve, and during the flow process, a strong aerodynamic noise is generated.

Engine noise is mainly transmitted into the cockpit from the fire barrier and the front floor of the cab. 2.Tire noise.

The general tire noise is mainly composed of three parts: one is the air flow between the tire pattern and the air disturbance around the tire; the second is the tire vibration noise caused by the vibration of the carcass and the tread part; The third is the road noise caused by uneven road surface. 3.

Airborne noise. One is wind noise, which is the noise caused by the pressure change caused by the separation of the air flow around the body; The second is air leakage, or suction sound, which is the noise generated by the interaction between the inhalation of the cab and the body gap and the airflow around the body; The third is other noises, including cavity resonance. 4.

Structure-borne noise. It is mainly affected by two factors, one is the vibration transmission mode of the body structure, and the other is the noise generated by the metal components on the body due to the vibration generated by the inside and outside.

The cause of abnormal engine shaking.

1. The foot glue of the engine is aging or loosening: the function of the machine is to reduce the vibration and buffer of the engine when working and fix the engine.

2. Engine cylinder shortage: It means that the engine has one or more cylinders that have not worked normally, which is manifested as obvious intermittent exhaust gas flow from the car, and the exhaust pipe shakes violently, sometimes accompanied by a sudden sound;

3. Engine carbon deposition: including cylinder carbon deposition, throttle carbon deposition, spark plug carbon deposition, intake carbon deposition, etc., when the carbon deposition inside the engine is excessive, the ignition energy of the car is reduced, and the air intake efficiency decreases, resulting in the engine shaking, acceleration weakness symptoms; 4. Fuel system failure: adding an unsuitable fuel label leads to a decrease in the output power of the car, a decrease in power, or due to the blockage of the vent of the fuel tank cover, the fuel tank switch, the fuel filter and the oil pipe between the fuel tank and the carburetor, which cannot meet the required amount of oil, resulting in too thin mixture and engine shaking.

The car will also have a clicking sound in the state of cold start, this sound is because the oil pump has not fully established the oil pressure during the cold start, resulting in the internal parts are not fully lubricated, when the engine runs for a period of time, the abnormal noise generated by the engine will disappear. In the process of working the engine only balance, the machine finger hungry mat will appear aging, the foot glue is the rubber rubber block between the engine and the frame, the main role is to reduce the vibration of the engine in the working process, play the role of fixing the engine, when the machine mat appears aging, the engine will appear clattering sound.

In this case, it is necessary to check the situation of the front wheel bearing and the half-shaft ball cage.

Analysis of the causes of the shaking of the gasoline version of the car:

1. Suspension system problems.

Body shake is also related to the aging of the suspension system. It is mainly responsible for filtering out the shake of the engine when it is running, and if there is a problem with the suspension, these vibrations will be transmitted directly to the steering wheel and cab, affecting the driving. When the engine is idling, it is easy to cause shaking when the electrical system in the car is turned on.

The engine will increase the load when the electrical appliances are turned on, causing the idle speed to drop, and to compensate for the jitter caused by the idle slip, the engine will automatically increase the speed by partially. So, when the electrical system, especially the air conditioner, is turned on, the engine will often shake. This jitter is likely to be caused by the aging of the shock absorber and needs to be replaced in time.

2. Tire problems.

For tires, the tire must be balanced once when the car is replaced with new tires and new steel rims, otherwise the steering wheel will be prone to shake when the counterweight is uneven. If you find that the tire weight is not equal, you need to add lead to the inside of the rim to average the weight of the tires on both sides. Whether it is a general steel ring or a lightweight aluminum ring, it may deform or crack when subjected to a certain external force.

Deformation of the rim can cause shaking when driving, uneven weight of the rim can also cause shaking when driving, and incorrect angle of the rim can also cause shaking when driving.

3. Throttle problems.

The most common cause of car shake may be a dirty throttle valve and excessive carbon build-up in the fuel injector. After driving a certain number of kilometers in the car, the throttle valve will be too dirty to cause the throttle to close loosely or the idle motor to stuck, resulting in the engine idle speed is too high, and the carbon deposits generated by the engine in the process will also cause the vehicle to shake, especially when starting the vehicle, the engine will shake more than normal, and even sometimes there will be a small appearance that can not be started at one time. Therefore, when the body shakes, the first thing to do is to check the throttle and fuel injectors.

If you find that the throttle valve is too dirty or the fuel injector has too much carbon deposit, you should clean it with fuel injector cleaner or throttle cleaner in time.

4. The oil pressure is unstable.

If these are all gone, you still find that the body is shaking, it is recommended that you go to the repair shop to check whether the fuel supply pressure and the intake pressure sensor are normal, if the oil pump supply pressure is abnormal, the intake pressure sensor is wrong and improper work will cause the body to shake.

The phenomenon of engine shaking will involve many reasons, such as excessive carbon deposition in the intake system such as throttle and idle valve, poor fuel injection atomization of the fuel injection nozzle, and poor working performance of the ignition system, which is mainly directly related to the working performance of the spark plug, high-voltage line and ignition coil

1. The engine lacks cylinders, and 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, which is generally manifested as: the exhaust gas flow discharged by the car has obvious intermittent intermittent gas, and the exhaust pipe shakes badly, so that the engine shakes obviously, and sometimes it is accompanied by a sudden sound. This is mostly related to ignition coil failure;

2. Carbon deposition problems include cylinder carbon deposition, throttle carbon deposition, spark plug carbon deposition, intake carbon deposition, etc., these positions are just closely related to the power output of the engine, when the carbon deposition inside the engine is excessive, the ignition energy of the car is reduced, and the air intake efficiency decreases, which eventually leads to the engine shaking, acceleration weakness symptoms;

3. Fuel system failure, adding inappropriate fuel labels (for example, No. 93 to No. 90), resulting in a decrease in the output power of the car and a decrease in power; Or due to the blockage of the vent of the fuel tank cover, the fuel tank switch, the fuel filter and the oil pipe between the fuel tank and the carburetor are partially blocked, which cannot meet the required oil volume, resulting in the mixture being too thin and the engine shaking;

4. Air intake system failure, air is one of the power of the engine, if the air filter is not cleaned in time for a long time, the lack of air volume will cause the combustible mixture to be too thick, so that the engine power decreases; If it is a vehicle with a turbocharger, the failure of the supercharger will also cause the engine to shake when accelerating;

5. Cold start, when the car is accompanied by the chain in the cold start, the engine lubrication effect is relatively poor, the oil fluidity is poor, and it is also relatively viscous, so there will be abnormal sound of mechanical wear, as well as cold start, the coolant temperature is relatively low, the mixture is relatively thick, and insufficient combustion will cause the engine to shake and, this is generally a normal phenomenon, and it will get better after the hot car.

The normal abnormal noise is not emitted by the shock absorber, and the CX20 is mainly due to the aging of the rubber sleeve of the swing arm, so it is good to replace it.

1. There may be many reasons such as damage to the damper in the shock absorber, damage to the top glue of the shock absorber, etc., which may lead to abnormal noise of the shock absorber. Replace the corresponding parts.

2. There are also problems that occur after the aging of rubber parts such as balance rod lifting lugs and arm rubber sleeves, which will also cause abnormal noise. Replace the corresponding parts.

3. It is also possible that the shock absorber oil in the shock absorber has poor fluidity at low temperature, resulting in excessive resistance of the damper during movement, which leads to the occurrence of this phenomenon. Change the shock absorber oil.

First of all, go to the store to check if there is a problem with the shock absorption, if not, the performance of this car is like that. Add a shock-absorbing rubber ring. Change the shock absorption.

If there is no oil leak, it is a problem with the design and quality of the barrel itself. You can find the manufacturer to make a claim.

The stationary idling is very quiet, but the sound comes out as soon as the throttle is stepped on, and the throttle is louder, and it is the baking sound

My colleague said that I couldn't stand it, and I couldn't do anything about sound insulation

This is a small check to see if there is any air leakage in the engine? Check the exhaust pipe for air leaks? Check whether the fault light on the instrument is on, and check whether the engine is missing cylinders.