What is the reason for the clattering sound of the Sylphy engine

Causes of abnormal engine noise:

1. The car is not at low speed, and under normal water temperature, if there is a buzzing sound, it is the sound of the electronic fan used for heat dissipation in the water tank, and the cooling fan equipped with the car is driven by a separate motor, which may be a temperature sensor or a failure of the temperature regulator;

2. In the case of low speed or variable speed of the car, the gap between the piston and the cylinder wall is too large, the piston pin is too tightly assembled or the connecting rod bearing is too tight, the gap between the tappet and its guide hole is too large, and the contour of the valve cam is worn, and the sound of discord is manifested at different speeds;

3. The engine "knocks on the cylinder", of course, this is a relatively regular pronunciation, and there will be a similar buzzing "body sound" in the initial performance, and the reason for this phenomenon is generally the adjustment of the valve timing;

4. Secondly, it is caused by more carbon deposits in the cylinder, and the carbon deposits are glued to the cylinder wall, especially in the case of cold cars, there will be a top valve.

The abnormal sound of the engine "click" can be said to be a more common engine noise, sometimes after changing the oil, to be precise, after changing the high viscosity oil, it is possible to clearly hear the sound of the engine "click", which is mostly caused by the high viscosity of the internal resistance, and generally has any impact on the engine. However, there is a problem with the hydraulic tappet, and there will be a "click" sound. Hydraulic tappets are designed to automatically eliminate valve lash to reduce engine noise.

However, once the hydraulic tappet fails, it will make the engine have a more serious "click" abnormal sound. So when changing the oil, it is best to replace it according to the model specified in the vehicle maintenance manual, I hope my help can help you, thank you, hope.

There is a clattering sound in the engine, which may be caused by the following reasons:

1. Abnormal noise of engine belts, such as generator belts, air conditioning belts, steering pump belts, etc., may be too loose or too tight, or it may be that the belt is aging, adjust the tightness of the belt, apply butter to the belt, or replace the belt.

2. The engine lacks cylinders, a cylinder does not work, the engine will be unbalanced and produce abnormal noise, and it is also accompanied by the violent shaking of the engine, insufficient power and other faults, which may be the fault of the ignition module, spark plug and fuel injector, and the corresponding accessories can be replaced.

3. Engine "tempering" failure. When the car slows down and collects the oil, there is a "poof" sound, which may be the engine "tempering" failure, which is usually called the engine "fire", too much carbon deposition on the valve or the wrong timing of the valve will produce abnormal noise, cleaning the carbon deposit on the valve or adjusting the timing of the valve.

The first thing to figure out is that it is ** ringing. Whether it's inside or outside the car, inside the front lid or in the trunk. The sound in the car may be due to the loosening of the screws on the console, which causes resonance, and it can be tightened.

If it is the interior sound, it can be reinforced to solve, such as the door and window sound, it may be wear and damage, or the screw is loose, or there is a hairpin feeling when turning the tire, or the bearing is removed and rotated to see if there is a hairpin feeling, if the above situation can be judged to be bad, and the bad noise of the bearing is related to the speed, and has nothing to do with the rough road surface.

The wheel bearing is damaged, this buzzing sound is different according to the speed, the faster the speed, the louder the sound, and the sound is a high-frequency vibration. It is manifested in the form of being particularly noticeable at certain speeds, not at other speeds, and more noticeable on rough roads than on smooth surfaces, and bearings do not have these characteristics.

Instead, it enters through the cracks in the box, causing a buzzing sound. The solution, of course, is to reinstall the sealant, etc. Wind noise, excessive tire noise, this is caused by poor sealing of the car.

The vibration of the engine will be transmitted directly to the frame, and the frame will shake with the engine at a certain frequency, which may bring resonance to other parts of the cabin. On the one hand, we can replace the suspension cushion, which also reduces the shaking of the vehicle, and on the other hand, we can install a resonance device in the cabin to drain the resonance. After the car is driven, with the growth of speed, the rolling friction of the bearing is getting bigger and bigger, when the bearing is short of oil or abnormal wear, it will produce friction noise, which is manifested in the form of buzzing, the faster the more obvious, and the acceleration and deceleration have nothing to do, and the buzzing noise is proportional to the speed of the vehicle.

The vibration of the engine will be transmitted directly to the frame, and the frame will shake with the engine at a certain frequency, which may bring resonance to other parts of the cabin. On the one hand, we can replace the suspension cushion, which also reduces the shaking of the vehicle, and on the other hand, we can install a resonance device in the cabin to drain the resonance. Therefore, you should look at your specific situation, and then analyze the noise of the first grade, so as to solve it in a targeted manner.

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 expansion of the fault.

It is because there are some foreign objects in the engine, so it will cause abnormal noise when the car starts, and the engine should be overhauled in time to avoid some traffic accidents because of the engine.

It could be the engine that has a bearing problem;

It could be a problem with the gearbox, a problem with the gears, a problem with the gearbox;

It could be a problem with the steering system, and when it comes to steering, there is a problem with the steering ball joint.

The first point is that the fuel consumption is particularly large, there will be such a phenomenon, the second point is likely to be some internal screws off, must be noted, the third point is likely to be its entire system problems.

It may be because of the ruggedness of the ground, or the factors of the surrounding environment, or because there are some problems with the engine, or maybe it is the problem of the car itself, there are many factors, and the specific situation has to be checked specifically, and there are many reasons, etc.

It may be that the engine is malfunctioning, and you often press the accelerator and brake pedal when driving, so there will be strange sounds.

If the abnormal sound of the Sylphy gearbox may be the stubborn dirt and impurities inside the gearbox, especially in the valve body, the dirt and impurities accumulate to form a blockage, resulting in the inability to achieve effective adjustment of the oil pressure, resulting in the occurrence of frustration, impact and slippage, and abnormal noise.

If it is a Sylphy shock absorber, it may be the aging or damage of the shock absorber glue, check whether the shock absorber is aging, replace the shock absorber glue, the shock absorber inspection: make the car stop after driving 10km on the road surface with poor road conditions, touch the shock absorber shell with your hands, if it is not hot enough, it means that there is no resistance inside the shock absorber, and the shock absorber does not work. At this time, you can add appropriate lubricating oil, and then test, if the shell is hot, it is a lack of oil inside the shock absorber, and the oil should be added enough, otherwise, the shock absorber fails.

When the car is driving slowly and braking urgently, if the car vibrates violently, it means that there is a problem with the shock absorber.

It may be because of the aging of your engine, or it may be that the interior of your car is not warranted, so there will be abnormal noise, you can also go to the 4S shop and ask them to check it for you in detail, so that it will be more detailed and clearer.

The brake discs and brake pads are rusted and stuck together, causing abnormal noises. This generally happens after driving in rainy days, the car is parked for a few days and is useless, the brake disc and brake pads are rusted and stuck together, and it will make abnormal noises when starting to drive again, which is also normal.

Sylphy Profile:

Sylphy is a medium-sized car owned by Dongfeng Motor and is one of the most typical mainstream sedans in the Chinese market (Octavia Pro, Suteng, Lavida, Corolla, Bora, etc.).

On August 28, 2020, Dongfeng Nissan's 2021 Sylphy was officially launched, and the new car is based on the 14th-generation Sylphy to further add more intelligent human-machine interconnection technology, appearance accessories and comfort configurations, and a total of 4 models were launched, with a market guide price of 10,000 yuan.

At the same time, the official provides five colors for the car: pearl white, tungsten steel gray, obsidian black, sky red, and cyclone orange. In addition, Dongfeng Nissan also offers the Dark Night Package (with a black rear spoiler, blacked-out front grille, blacked-out door handles, blacked-out wheels, etc.) for customers who purchase the XL CVT Smart Edition model, providing a more personalized car purchase option for young families.

I just bought the new Sylphy for four months and regretted it, and the car kept making abnormal noises.