What happened when the car suddenly shakes? What is the reason why the car shakes a lot?

Most of the cold start jitter is caused by poor fuel combustion, the fuel tank has more gum moisture, too much carbon deposition inside the engine, and the cold start is not brought to the combustion chamber and then mixed in the fuel tank is driven into the combustion chamber, and the jitter caused by poor combustion. The gasoline emitted by the cold start injector will be absorbed by carbon deposits, resulting in a dilute mixture for the cold start, which makes the start jitter.

If carbon deposits occur in the valves and intake tracts of the engine, the ECU will make an error in judgment because the carbon deposits can absorb the appropriate amount of fuel. If the computer actually controls the injection of hypothetical 100 parts of oil and gas, but only 90 parts actually enter the cylinder (10 parts are absorbed by carbon deposits), then even if the remaining 90 parts of mixed oil and gas are fully combusted, this cannot achieve the required power, and the phenomenon of jitter is inevitable.

Solution; The best way is to clean the oil circuit, clean it regularly, there is no specific experience in the research and development parameters of the clean engine from the new car, coupled with the continuous improvement of emission standards, can not adapt to the change of fuel, all manufacturers of the engine are unable to solve this jitter problem in the short term, plus the fuel quality is not very good or the initial fuel of the new car factory is stored for too long, resulting in a rapid increase in the colloidal composition of the oil circuit, which will continue to pollute the fresh fuel and cause no good fuel to participate in combustion in the later stage. The occurrence of excessive carbon deposits is especially common for China VI vehicles. We can only gradually alleviate most of the problems by maintaining clean oil circuits. The use of PNF dope fuel additives can solve the problems caused by carbon deposition.

1. The engine has a lot of carbon deposits.

Too dirty throttle valves or too much carbon from the fuel injector are the most likely causes of car jitter. When starting the car, the fuel on the carbon deposits will be sucked into the cylinder by the engine for combustion, and the amount of flammable gas mixture in the engine will be high and low, so the body will shake during cold start. As a rule, if you clean the throttle and other oil circuits on time, this problem will not occur.

2. Ignition system failure.

This is also an important reason for the body shake when idling. If there is a problem with the spark plug, high-voltage wire, or ignition coil, the body of the car will shake when it is started. At this time, you can check whether the carbon deposit in the spark plug is too much, and you can also replace it with a new spark plug if necessary.

3. Jitter caused by unstable oil pressure.

If the inlet pressure sensor value is inaccurate after the oil pump supply pressure is abnormal, it will also shake. At this time, you can check the oil pressure, and if you need to replace it, you need to replace it in time.

Main causes of idle jitter:

1.Serious engine carbon deposits: Cars always have the problem of carbon deposits, including cylinder carbon deposits, throttle carbon deposits, spark plug carbon deposits, intake carbon deposits, etc.

When the engine has too much carbon deposit, it will affect the ignition energy, air intake efficiency and air-fuel ratio of the car, resulting in the unstable power output of the car, and the phenomenon of idle speed and acceleration jitter appears.

2.Unstable oil pressure: If you have cleaned the engine carbon deposits, cleaned the throttle, replaced the oil gasket and spark plug, etc.

And when idling, you still find that the body shakes, it is recommended that you go to the 4S shop to check whether the oil supply pressure and intake pressure sensor are normal, if the oil pump supply pressure is abnormal, or the intake pressure sensor value is wrong, and the work is not good, it will cause the body to shake.

3.Engine cylinder shortage: Engine cylinder deficiency mainly refers to the engine one or more cylinders are not working properly, which is generally manifested as:

The exhaust fumes coming out of the car are obviously intermittent, and the exhaust pipe shakes violently, and the engine shake can be clearly felt, sometimes accompanied by abnormal noises. This is mostly related to ignition coil failure.

4.Aging of engine parts: Shake in the car is also associated with the aging of the engine feet (also known as claw pads).

The engine foot is actually the shock absorber system of the engine. The engine feet are responsible for absorbing slight vibrations when the engine is running. If there is a problem with the engine base, these vibrations can be transmitted to the steering wheel and cab, causing vibrations at idle.

Solution; The best way is to clean the oil circuit, clean it regularly, and use PNF fuel additives to solve the above problems caused by carbon deposits. The fuel quality is not very good or the initial fuel of the new car is stored for too long, resulting in a rapid increase in the colloidal composition of the oil circuit, which will continue to pollute the fresh fuel and cause no good fuel to participate in combustion in the later stage, and the carbon deposition exceeds the standard, which is especially common for China VI vehicles. We can only gradually alleviate most of the problems by maintaining clean oil circuits.

The causes of jitter are as follows: the throttle is too dirty or the injector has too much carbon build-up, which can cause the engine to shake. Spark plugs, high-voltage wires and ignition coils, after a certain period of work, will cause the ignition system to work poorly.

Solution, check the working condition of the spark plug, high-voltage wire and ignition coil, and replace the spark plug. When starting the vehicle, the engine will shake more than normal, and sometimes even the phenomenon that it cannot be started at one time, the solution: clean the oil circuit, check whether the idle motor has carbon deposits that need to be cleaned.

After the car is driven for a period of time, the throttle valve will be too dirty, which will cause the throttle to be closed poorly or the idle stepper motor to stuck, which can cause the engine to idle too high. The carbon deposits generated by the engine during operation can also cause the vehicle to shake.

What is the reason for the obvious shaking of the car? 1.The engine has serious carbon deposits; Solution;

Clean the oil circuit and check whether the idle motor has carbon deposits and should be cleaned. 2.ignition system problems; Solution;

Check the spark plug for excessive carbon build-up and replace the spark plug. 3.unstable oil pressure; Solution;

Look at how to shake, the general horizontal (left and right) shake should be a problem of dynamic balance or tires, adjust the tires, replace them if necessary, do the dynamic balance from the new, do it well, if you deviate from the 4-wheel alignment. In addition, the engine and transmission claw pads (also called brackets) should also be checked for aging and breakage.

There are four reasons for the intermittent shaking of engine idling, the first point is caused by excessive carbon deposition inside the engine, the second point is caused by problems in the ignition system, the third point is the unstable oil pressure, the oil pump can not supply oil in time, and the fourth point is the fault caused by insufficient engine cylinder pressure.

What happened when the car suddenly shakes? There are many reasons for car shaking, to put it simply, 1 poor car fuel quality, 2 carbon deposits in engine valves and intake pipes, 3 check whether the spark plug is damaged and so on.

Tire failure, forming a dynamic imbalance state.

Engine failure causes engine shake.

The hydraulic power unit cannot reach balance when working, which affects the normal operation and stable speed of the cylinder.

Severe car shaking can be caused by poor oil quality or carbon build-up in engine valves and intake ducts.

1. The volatility of inferior fuel is very poor, especially in winter, when the temperature is low and the cold car starts, the engine block temperature is low, and the fuel is difficult to atomize, resulting in the fuel injected into the cylinder can not be fully mixed with the air, resulting in difficulty in starting and the body shaking badly.

2. Because carbon deposition can absorb an appropriate amount of fuel, the judgment of the electronic control unit is wrong. The computer actually controls the injection of hypothetical 100 parts of oil and gas, but only 90 parts actually enter the cylinder (10 parts are absorbed by carbon deposits), so even if the remaining 90 parts of mixed oil and gas are fully burned, it will also not achieve the required power, thus causing the car to shake.

Analysis of the causes of car shake:

1. Cold start jitter.

First of all, starting from the cold start, the main reason for the cold start body shaking is that the fuel combustion is insufficient, resulting in insufficient power of the car. The ignition energy is low, and when starting, especially when the temperature of the fuel and lubricating oil is low, more oil is required to meet the power. Over time, the pole gap of the spark plug gradually increases, resulting in a decrease in ignition energy and poor fuel atomization, which leads to the shaking of the body.

In addition, the ignition energy can also be reduced due to the aging of the ignition coil, the aging of the high-voltage wire of the spark plug, or the leakage of electricity.

2. 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.

3. 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.

4. 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 the car travels for a period of kilometers, the throttle valve will be too dirty to cause the throttle to close loosely or the idle motor to stagnate, resulting in the engine idling speed is too high, and the carbon deposits generated by the engine in this 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 phenomenon 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.

5. The oil pressure is unstable.

If you still find that the body shakes after these are finished, it is recommended that you go to the repair shop to check whether the fuel supply pressure and intake pressure sensor are normal, if the oil pump supply pressure is not normal, the intake pressure sensor is wrong and improper work will cause the body to shake.

1.The most common cause of car shake caused by serious carbon deposits in the engine is that the throttle valve is too dirty or the fuel injector is too much carbon. When the carbon deposition inside the engine is excessive, the gasoline sprayed by the cold start fuel injector will be absorbed by the carbon deposition in large quantities, resulting in the mixture of cold start being too thin, making it difficult to start, in this case, only when the gasoline absorbed by carbon deposition is saturated, it is easy to get on the car, and the gasoline adsorbed on the carbon deposition after the car will be sucked into the cylinder by the vacuum suction of the engine for combustion, and the mixture becomes thick, and the combustible mixture of the engine is dilute and thick, causing idle shaking after cold start.

The lower the temperature, the greater the amount of oil required for the cold start, and the more carbon deposits will affect the smooth cold start. Solution: Clean the oil circuit and check whether the idle motor has carbon deposits and should be cleaned.

2.Ignition system problems Check the working condition of the spark plug, high-voltage wire and ignition coil, the ignition system is not working well, and the spark plug flashing condition is not good will also lead to this kind of failure. Solution;

Check the spark plug for excessive carbon build-up and replace the spark plug. 3.If the oil pressure is unstable, if you have cleaned the engine carbon deposit, washed the throttle, changed the oil pad and spark plug, etc., and still found that the body shakes when idling, it is recommended that you go to the 4S shop to check whether the fuel supply pressure and intake pressure sensor are normal, if the oil pump supply pressure is abnormal or the intake pressure sensor value is wrong and the work is not good, the body shakes will be caused.

Solution: Check the oil pressure and replace the parts if necessary. 4. The aging of engine parts and the shaking of automobiles are also related to the aging of engine feet.

The engine foot is actually the suspension system of the engine, and the engine foot is responsible for absorbing the subtle shake of the engine when it is running, and if there is a problem with the engine foot, these vibrations will be transmitted to the steering wheel and cab, causing shaking when idling.

Idle shaking, the new car has been used for a period of time, and some owners will find that the body has some small shaking, but they don't know that there is a problem. "Body shake" is a sign that something is wrong with the car. Professionals tell us that body shaking may seem like a trivial matter.

Problems with the ignition system are also one of the reasons for the vehicle shaking, when there is a problem with the spark plug, high-voltage wire or ignition coil in the ignition system, the car will also be shaken when starting, and the owner can judge the cause of the vehicle's idle jitter by checking the spark plug.

3. Unstable oil pressure

When the data of the oil supply pressure of the automobile oil pump is inaccurate, the vehicle will also shake when idling, check the oil pressure, and deal with it in time if it needs to be replaced to avoid causing greater failures.

Possible causes of engine shake are:

Blocked air cleaner causes idle speed to be too low.

A cylinder does not work or works poorly.

The oil pump is not in good condition, and the oil pressure is unstable.

Carbon deposits in the combustion chamber.

Carbon accumulation in the grease nozzle and uneven fuel injection.

The cylinder is worn, and there is air leakage.

The valve is not closed tightly.

The idle speed is low. The high-voltage line is broken.

The water temperature is abnormal, and the feedback of the temperature control switch is not accurate.

Occasionally, if the cylinder is missing, the fault light will not be lit.

In the event of a recurrent fault, the engine EPC light will give an alarm.