What is the cause of the intermittent shaking of the car

There are several reasons for engine shake:

1. The engine has serious carbon deposits, and the most common car with serious shake is that the fuel injector throttle valve is too dirty or too much carbon;

2. Ignition system problems, check the working conditions of spark plugs, high-voltage wires and ignition coils;

3. The oil pressure is unstable, if the first pressure of the pump is abnormal or the error and poor work of the inlet pressure sensor will cause the body to shake;

4. Aging of engine parts; Excessive carbon deposits in engine emissions absorb carbon from the gasoline of the cold-start injector, which leads to a dilute cold-start mixture and difficulty starting.

Severe idle vibration is generally caused by engine cylinder failure, aging or loose foot rubber, carbon deposits, fuel system failure, etc.

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, 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.

The causes of intermittent car shaking are as follows:

1. Carbon deposition in the intake system, that is, there is a large amount of colloidal carbon deposition near the valve seat and around the idle motor, resulting in over-concentrated and over-dilute mixture. Idle jitter will be formed, which is more noticeable when the car is started cold.

2. The throttle is too dirty, because there is colloidal carbon deposit or too much dirt around the throttle valve, the cross-sectional area of the air channel will change, so that the control unit can not accurately control the idle air intake, resulting in too thick or too thin mixture.

What to do if the engine is shaking at idle.

Slight jitter is normal, if the jitter is more severe, you need to check it.

The most common cause of car shake is a dirty throttle or excessive carbon build-up in the fuel injector.

When the carbon deposit inside the engine is too much, the gasoline sprayed out by the cold start fuel injection head will be absorbed by the carbon deposit 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 the carbon deposit is saturated, it is easy to get on the car, and the gasoline adsorbed on the carbon deposit 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.

1. Check whether the ignition system is faulty. Generally, it is caused by the ignition coil or the aging of the spark plug, and the damaged ignition coil or spark plug can be replaced. The inspection of the ignition coil needs to use the computer to read the specific fault code, if the corresponding cylinder has a misfire, it is generally a problem with the ignition coil.

2. There is too much carbon deposition in the engine. In this case, it is recommended to clean the carbon deposits in the engine, especially the carbon deposits in the intake tract and cylinder of the throttle. The carbon deposits in the cylinder are mainly the piston position and the valve base position, and then rematch the throttle.

3. Oil circuit failure. In this regard, it is necessary to check whether the fuel supply pressure of the gasoline pump is normal, and if the oil supply pressure is unstable, it is necessary to replace the new gasoline pump in time.

Dirty throttle, aging spark plugs, gasoline, etc

1. The engine produces serious carbon deposits

Carbon deposition in the engine is the main cause of car shaking, when there is too much carbon deposition inside the engine, the gasoline sprayed by the cold start injector will be absorbed by the carbon deposit, resulting in a dilute mixture for the cold start, which will make it more difficult to start the cold start.

2. Hydraulic problem:

If the fuel supply pressure and intake pressure sensor are normal, if the oil pump supply pressure is abnormal, or if the intake pressure sensor is wrong and the operation is not good, the body will shake.

3. Ignition system failure:

Spark plugs are wearing parts, which need to be replaced regularly, if it is found that the spark plug has too much carbon or the ignition gap is too large, it needs to be replaced, and it is also necessary to check the working state of the high-voltage wire and ignition coil, and the car computer can be used to determine the state of the ignition system.

1. The quality of the product is poor, the temperature is low in winter, and when the cold car starts, the temperature of the engine block 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, which causes difficulty in starting and the body shakes greatly.

2. Carbon deposition in the engine valve and intake pipe 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 of the fiber mass are absorbed by carbon deposits), so even if the remaining 90 parts of the mixed oil and gas are fully combusted, it will not achieve the required power, and the phenomenon of jitter is inevitable.

Solution: The owner should regularly clean the engine valve and intake pipe.

3. When the spark plug car starts, especially when the fuel and lubricating oil temperature are low, it is necessary to bombard the oil 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.

Solution: Replace the spark plug parts if necessary.

4. Transmission oil problems.

Dirty transmission oil can cause the vehicle to shake when shifting gears. You can check the lower transmission oil, if it is blackened, it needs to be replaced, and the general automatic transmission oil is about 6w kilometers in 2 years.

5. The problem of shift solenoid valve is automatic.

If the gearshift solenoid valve of the gearbox is faulty, it will cause the car to shake when the car is destroyed when shifting, and the detector can be used to read whether the shift data of the gearbox is normal.

The main reason for the shaking of the vehicle is that the fuel combustion is not good, and the rental power provided to the vehicle is insufficient. 1. Low ignition energy: If the temperature in the engine is low and the temperature of fuel and lubricating oil is low when the vehicle is cold starting, more fuel should be injected to meet the requirements of power.

After long-term use, the pole gap of the spark plug is easy to become larger, resulting in a decrease in ignition energy and poor fuel atomization, thus making the car.

The most common cause of car shake is that the throttle is too dirty or the fuel injector has too much carbon.

Poor idle operation: It may be that the engine shakes at idle speed, the idle speed is too high and exceeds the specified upper limit, the idle speed is low and less than the specified lower limit, or the idle speed is not soft. These phenomena are related to the failure or poor operation of components such as fuel injectors, oxygen sensors, air flow sensors, and exhaust gas recirculation valves, as well as poor connection of control circuits and vacuum pipelines.

Extended Information: Cannot be started or has difficulty starting:

The phenomenon of not starting may be that the ignition switch is turned on and the engine does not have any signs of starting, the starter is loud but cannot rotate, the starter can turn but cannot move the engine, or the engine can be driven by the starter but cannot start. Difficulty in starting may be the slow rotation of the engine, or the rotation of the engine.

These phenomena are related to the poor operation of the main injector, cold start injector, temperature control switch, ECU and control circuit, battery power loss, ignition or pulse generator damage, fuel system does not supply oil or abnormal oil supply and other factors. For automatic transmission cars, failure to start may be due to the wrong position of the transmission handle.

What is the problem with car jitter?