What is the cause of engine shake in a 30,000 kilometer cold car?

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

2. When the carbon deposit inside the engine is excessive, the gasoline sprayed by the cold start fuel injection head will be absorbed by the carbon deposit, resulting in the mixture of cold start is 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 will be sucked into the cylinder by the vacuum suction of the engine after the car is burned, and the mixture becomes thick, and the combustible mixture of the engine is dilute and thick, resulting in idle shaking after cold start.

The mileage is not much, you can clean the lower throttle and take a look, maybe it can be solved.

1. The temperature in the engine is not enough: when the cold car is started, the temperature in the engine is about the same as the surrounding environment, the temperature at this time is not suitable for the engine to work, and the fuel atomization is not good in the low temperature environment, which leads to the decline of ignition energy, which affects the power and makes the car shake, which will occur more in winter, so in winter, the car can be parked in the garage, which can alleviate the phenomenon of engine shaking.

2. The mixing ratio of oil and gas is not accurate: when the car is cold started, the viscosity of the oil is relatively large, and each component can not be fully lubricated, which is prone to the phenomenon of inaccurate mixing ratio of source oil and gas, and the judgment error of the automobile computer reduces the power output of the car, resulting in the phenomenon of shaking of the car.

3. Automobile carbon deposition: automobile carbon deposition is one of the important reasons for the cold start jitter of the car, in the daily driving process, due to the different driving environment and the driver's driving habits, it will lead to different degrees of carbon deposition, and excessive carbon deposition in the valve and intake pipe leads to difficulty in cold starting.

1. The engine mixing ratio is not suitable.

The mixing ratio of oil and gas is not accurate, which exists in both open-loop and closed-loop control. In a closed-loop controlled car, the minimum operating temperature of the oxygen sensor is 370 degrees Celsius, and if the car is just started, the oxygen sensor does not work because the temperature in the exhaust pipe does not reach 370 degrees Celsius. At this time, the ECU misjudges, and the control of the oil and gas mixing and ignition time through the actuator has an error, thereby reducing the power output of the car and causing shaking.

2. The throttle or air flowmeter is dirty, resulting in a decrease in air intake; The EGR (exhaust gas recirculation) valve is not in good working condition and introduces exhaust gases at idle; The idle motor controls the bypass of the air inlet to adjust the amount of air intake, if the voltage is low, the operation may not be in place; The oil is too poor to reach the corresponding calorific value, resulting in a small power output for combustion. The above four factors can lead to poor combustion of a cylinder during cold start or waiting in neutral, resulting in engine shaking.

Depending on the situation, the causes of cold car shaking may be:1A dirty throttle can cause idle jitter.

2.A faulty spark plug can cause the vehicle to shake at idle. 3.

The engine has a cylinder that does not work and can also cause idle jitter. There is also a shake of the vehicle when the vehicle accelerates at low speeds. 4.

The rubber parts inside the engine mounts and transmission mounts are aging and open, causing the vehicle to idle and shake.

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. aqui te amo。

What is the cause of the "shaking" engine start-up of a cold car?

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.

The car starts cold, the engine shakes a lot, and sometimes it stalls.

There is no high idle speed anymore.

Check out the Solar Savers and Water Temperature Sensing Plugs.

This is something to scrutinize.

I don't know which car you are.

This phenomenon can be caused by too much carbon deposits inside the engine.

Today's uneven fuel quality and congested urban road conditions are the causes of easy formation of carbon deposits. Bad oil contains a lot of impurities or gum, which is very easy to form carbon deposits in the engine. Moreover, the congested urban road conditions make the vehicle always in a stop-and-go state, and the engine cannot run at high speed, which will also make the unburned part of the oil form carbon deposits under the action of high temperature and oxygen.

It is inevitable that the carbon deposit will be generated during the engine work, but when the carbon deposit is too much in the engine, it will cause the engine to work poorly and produce different failures. When there is too much carbon deposit inside the engine, the gasoline sprayed out by the cold start fuel injector will be absorbed by the carbon deposit, resulting in the mixture of cold car start is too thin, making it difficult to start, until the gasoline absorbed by the carbon deposit is saturated, it is easy to get started, and the gasoline adsorbed on the carbon deposit will be sucked into the cylinder by the vacuum suction of the engine after landing, so that the mixture becomes thick, and the combustible mixture of the engine is dilute and thick, causing idle shaking after the cold car starts.

An easy way to combat nozzle carbon deposits is to drive your car on the highway at high speeds. Or for a period of time, drive at high speed in low gear and increase the engine speed, the purpose of which is to increase the air intake of the engine and the flow of gasoline, which helps to remove carbon deposits from the nozzle.

In general, it is normal for a cold car to shake than a hot car.

Even when a new car starts cold, it will shake more than a hot car. The main reasons for this jitter are as follows: the mixture is too thick, the speed is too high, the mechanical parts are not at the optimal temperature, and the oil is not at the optimal temperature

1.The mixture is on the thick side.

Today's cars are all EFI engines, and the engine will adjust the amount of fuel injected according to the oxygen content in the exhaust, which is the so-called "closed-loop control". The oxygen sensor that reads the oxygen content must work in a high temperature environment (at least 300 °C), and the exhaust pipe does not reach this temperature when the cold car is started. At this time, the engine will actively ignore the signal of the oxygen sensor, temporarily increase the amount of fuel injected to allow the cylinder to obtain a high concentration of mixture, and give priority to ensuring that the engine burns smoothly without stalling, which is the so-called "open-loop control".

At this time, there is ***, one is high fuel consumption, and the other is that the engine is more shaky. When the temperature of the exhaust pipe rises and the oxygen sensor works normally, the engine computer will automatically switch to the "closed loop". Therefore, after the hot car, the engine will not only reduce fuel consumption, but also run more smoothly.

2.The rotational speed is on the high side.

In order to ensure that the engine heats up as soon as possible to reach the standard operating temperature (90-110) during cold start, the computer will deliberately increase the throttle opening, so as to increase the speed appropriately and increase the load. Another benefit of this setting is that it helps the engine start smoothly, so the judder will naturally be more noticeable at high revs.

3.The mechanical parts are not reaching the optimal temperature.

The engine is assembled with many metal parts, and the materials of different parts are different, so the factors of thermal expansion and cold contraction have to be considered. When engineers design the size of engine parts, they are based on the standard operating temperature, so the gap between the parts of the engine is relatively large when the engine is cold, and a certain amount of jitter will naturally occur during operation. When the engine temperature warms up to the standard temperature, the jitter naturally relieves.

4.The oil is not operating at temperature.

The viscosity of motor oil decreases as the temperature increases, and generally speaking, all characteristics of around 80-100 degrees Celsius are the best. When the engine is cooled, the oil temperature is low, the viscosity is high, and the lubrication of the rotating parts of the engine is not optimal, which is also one of the reasons for the increase in jitter.

As long as the water temperature is normal, it's fine. No problem, it was cool in the morning or for a long time to park the car, and the engine water temperature did not reach the normal temperature. The mixture supplied by the engine computer is thick, and the oil supply is small, which cannot meet the lubrication requirements, so the speed is high and the sound is loud or the work is unstable and the exhaust smell is large, and as the engine gradually heats up, it slowly returns to the normal idle speed.

Let's talk about buying a car, using a car, maintaining a car, and repairing a car.

Most of the cold start shaking is caused by poor fuel combustion, and long-term poor combustion must be carbon deposits, but it cannot be judged that the combustion is not good, and there must be a large amount of carbon deposits, at least it can mean that the oil circuit should be cleaned or replaced with a fuel. You can add the national VI standard of the division of fuel additives in the fuel tank to run a tank of oil, you can improve,

It's normal for the engine to shake when it's cold, as long as it's stable and regular.

First of all, we must know that as long as it is a gasoline engine, it will vibrate, because the machinery will inevitably vibrate when it is running. There will be no jitter in the pure electric branch core car.

When the cold car starts, all kinds of lubricating oil and lubricant in the engine flow to the bottom of the oil shell due to the action of gravity. At this time, the engine lubrication effect is not good, coupled with the air-fuel ratio is too thick, the oil fluidity is poor, and the combustion is not sufficient, which will lead to engine shaking. Generally, it will be fine after the hot car.

There is a way to judge whether it is abnormal, which is to see if the tachometer is stable during the shaking process. If the speed indicator is also swinging up and down while idling, there is something wrong with the car and needs to be checked.

If the shaking posture is not normal, there are many reasons involved. Whether it's the air intake system, the oil supply system, or the ignition system, if one of them fails, it can cause jitter. It is recommended to go to a 4S shop or a professional car repair shop, ask a technician to check it, and then correct the problem.

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Most of the cold start jitter is caused by poor fuel combustion, the fuel tank has more gum moisture, 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.

There are several causes of 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. If the oil pressure is unstable, if the 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.

Specific solutions to idle jitter:

1. The engine has serious carbon deposits. The most common cause of idle judder is excessive carbon build-up on the throttle or injector. When there is too much carbon deposit inside the engine, the gasoline sprayed by the fuel injector during cold start will be absorbed by the carbon deposit, resulting in a mixture that is too thin and making it difficult to start.

After landing, the gasoline adsorbed on the carbon deposits will be sucked into the cylinder by the engine and burned, which will thicken the mixture. The mixture is sometimes dilute and sometimes thick, which will cause idle jitter after cold start. The lower the temperature, the greater the amount of oil required for cold starts, and the more the presence of carbon deposits affects cold starts.

The solution is to clean the carbon deposits at the throttle and injector.

2. Poor ignition system and poor ignition of spark plugs will also lead to engine idling and shaking. If there is a problem, check if the ignition system is faulty and if there is too much carbon deposited in the spark plug.

3. The oil pressure is unstable. If you have cleaned the engine carbon deposits, cleaned the throttle valve or replaced the spark plug, and there is still the problem of body shaking when idling, it is recommended to go to the 4S shop to check whether the fuel supply pressure and intake pressure sensor are normal. If the oil pump is not properly supplied or the intake pressure sensor is incorrect, it will also cause the body to shake 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.