What to do if the Audi A4L idles and shakes, the Audi A4L idles unsteadily and shakes

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.

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 supply pressure is not normal or the intake pressure sensor is incorrect, it can also cause the body to shake when idling.

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 main cause of idle jitter;

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 deposition inside the engine is too much, the gasoline sprayed by the cold start fuel injector will be absorbed by a large amount of carbon deposition, 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 started, 3. After the car is adsorbed, the gasoline adsorbed on the carbon deposition 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, resulting in 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.

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

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.

Unstable idling, engine shake and flutter, difficulty in starting, high idle speed, and excessive exhaust gas are all problems such as carbon deposits caused by poor combustion, so carbon deposits must be cleaned on time. Conventional vehicles must also be cleaned every six months or 10,000 kilometers to deposit carbon. Cleaning can be done with some no-dismantling cleaners.

What is the reason for the Audi A4 idle unstable shaking? Check whether the tail pipe is blackened first, and if so, it should be determined.

Period to clean the oil circuit, only this one way, I used the car idle shake 1, the master did not check the problem and finally said that it may be carbon deposits, give me 2 Si Youpu fuel additives poured in the fuel tank, ran two sesame oil have, it is very smooth. I guess it's carbon deposits.

1. Oil road problems: mail road problems are generally caused by oil road blockage, resulting in poor oil supply, which is manifested as engine shaking, unstable standby speed, and stalling during driving; In addition, engine shake will also occur when the oil pump fails, and the oil pump problem should be judged by disconnecting the oil pipe and checking the flow rate and flow rate.

2. Circuit problems: check whether the right fit is accurate, and the general ignition is not normal is the right fit problem; Check whether the spark plug has aged, whether the gap is the same, and whether the gap has changed; In addition, if the distributor does not work properly, it will also cause the engine to shake.

3. Mechanical reasons: check the running status of the engine, whether there is abnormal sound, valve sound; Check the working condition of the belt and whether it is loose.

A non-negligible cause is "carbon deposition", which will cause insufficient combustion of gasoline and cause the engine to shake. The impact of engine carbon deposition on the car is quite large, first of all, to reduce the engine power, that is, to make the power output uneven and gradually decay, in other words, more and more powerless. The second is to increase fuel consumption and increase your financial burden.

The third is the difficulty of cold start, that is, the difficulty of ignition, it is not easy to get on the car, and finally the serious carbon deposition in the combustion chamber will also cause cylinder detonation, and there will be a sound of low-speed acceleration, which will cause damage to the piston and crankshaft, thereby seriously affecting the safety of the car. Then there is the excessive discharge, which not only fails the annual inspection and inspection, but also directly aggravates the harm of polluting the environment.

There is another reason: the throttle valve is faulty. Both of these problems can cause engine shake and unstable speed.

Analyze the cause:

Some 4L shake, some don't shake, the circle of riders found a phenomenon is that there is less shaking, and there is basically no such intermittent slight jitter when running. Many people who shake have also been solved, starting from the maintenance of the oil circuit, although the new car is very new, it does not mean that the fuel is completely new. In this process, the fuel is actually a long time, plus the storage to the sale, the time is longer, resulting in the extreme deterioration of the fuel, the spoiled fuel will produce rapid pollution of fresh fuel, that is, there are oil bacteria in the gasoline, and the spread speed of bacteria is much faster than the spread of bacteria in places with sufficient oxygen, and the whole tank of fuel will be spoiled within 2-3 days.

When all the fuel in the oil circuit deteriorates, it leads to unstable combustion quality after combustion through the combustion chamber, or the extremely small aperture of the fuel injector is due to the excessive gum in these deteriorated fuels, and the impurities of large particles block the local position of the fuel injector, and the intermittent injection atomization is not good, and the combustion shake appears, so it is intermittent.

However, the fuel is not clean, therefore, the less you run, the more serious the degree of pollution, and the cycle will appear, more obvious jitter and excessive carbon deposits, a vicious circle, tens of thousands of kilometers after the engine working condition is always at the critical value of high temperature work. After a long time, the piston snap ring has been partially stuck due to long-term high temperature, and finally it is to burn the engine oil, and the fuel injector of the direct injection vehicle will not burn for a long time because it works in the combustion chamber, and the fuel injector will produce excess ash outside the nozzle to continuously cover, and the fuel injector will appear aging and dripping after tens of thousands of kilometers, resulting in a series of more uncomfortable driving experience and high fuel consumption and low power output.

The solution, can be in accordance with the current circle of many riders of the approach, in the fuel tank to add additives such as Si Youpu stock solution, more running, when the bad substances are discharged through decomposition and combustion, the idle shake will be alleviated a lot to finally disappear. According to the condition of the car, the new car is maintained 2-4 times. My car used to be idle shake intermittent slight shake, 6000 km, after 3 times of maintenance, now 2w km red light still has no jitter feeling.

In addition, there is also a situation that the quality of the initial oil of the new car or the deterioration of the engine oil causes the engine to vibrate greatly, and the body idling shakes driven, which can also be added to the engine oil with general pressure anti-wear agent, and the super-lubricated state is achieved after dozens of kilometers, when the engine is working in a super-lubricated state, the engine working condition can be improved, the noise and vibration will be significantly reduced, the throttle will feel more relaxed, and the vibration of the natural engine at the same speed will be reduced, and the shaking will not be obvious.

Idle shaking, no reason to turn off, before the power to start and is to encounter such a problem in vain, it is recommended to clean the oil circuit first, if it is not for the old repairman oil experience, but also continue to replace parts, and then used the Si Youpu fuel additives fuel additives, a tank of oil is good smooth and not all.

If a new car shakes at idle, it can be said that it is not good to burn, nor can it be said that it is carbon deposit, which will lead to carbon deposit for a long time due to poor combustion.

Poor combustion is directly related to the oil circuit. Carbon deposition does not mean that it will shake, but it will shake if it is not burned well. You can clean the oil road, don't look at your less kilometers on the oil road will be fine, this is not your decision, is the fuel company's excellent product decision. After encountering, the new car should pay attention to the moisture problem of the fuel tank and the impurities and excellent products of the oil circuit, and can use additives for a cleaning, so as not to let the fault continue and cause greater losses.

This problem is not caused by accessories, so it can't be repaired, only cleaning, and cleaning is not covered by the warranty. It shows that this is not a big problem, as long as you use Si Youpu fuel additive additive fuel tank 2 to run two tanks of oil. In fact, gas stations regularly clean underground oil tanks, not to mention fuel tanks, which are caused by poor combustion, that is, the oil circuit is a little dirty and there is no big problem.

What year is your car, and what is the engine displacement?

Let me talk about my personal understanding and diagnostic direction.

First of all, according to what you say. The acceleration turned out to be no more than 100 miles. Changed to three-way catalysis.

That's it. That illustrates three-way catalysis.

There is a problem. I don't know if you read it.

Oxygen sensor. data group. It should be checked to see if the oxygen sensor is damaged together and causing the idle speed to be unstable. And.

A dirty throttle can also cause an unstable idle.

Second, I'm wondering what caused the damage of the three-way catalysis. I think 90% of this problem is present.

Gasoline on the body. Third. About more than one.

The cylinder is out of flame. It is necessary to test from 4 places. Fuel injection. Ignition. Intake air and cylinder pressure. The ignition has been replaced with an ignition coil.

Spark plug. Ignition intensity.

If you can. It can be ruled out, I don't think it has much to do with the intake air, then the cylinder pressure and fuel injection are left, first of all, the lower cylinder pressure is detected. See if you qualify. Because the A4L is an aluminum cylinder block.

Check the lower cylinder wall for slight scratches. If so, it will cause unstable idling. Generally, the cylinder pressure is around 11.

The minimum must not be lower than 9 bar

Then check the fuel injection. I think this is due to the quality of the gasoline. If the gasoline is not of good quality. It will form a large number on the surface of the piston.

Carbon deposits. It directly leads to the combustion in the cylinder and the incomplete ignition. on this. If all 3 of the above are normal. Please remove the spark plug. Clean the piston surface. Be sure to wash it well. Then go for a test drive, it should be fine.

Summary: I think it is the quality of gasoline: it leads to three-way catalysis and multi-cylinder ignition.

The reasons for the shaking of the car engine when idling come from the following: 1. The throttle is dirty and blocked; 2. Poor fuel transportation; 3. High-voltage power supply failure; 4. Individual spark plug failure; 5. Excessive carbon accumulation in the intake and exhaust valves, etc., which may cause unstable or shaky idling, which must be checked one by one.

This kilometer of auto parts will basically not be broken, the probability is very good, but the probability of bad combustion will be relatively large, first from the poor combustion analysis of this cost is also the lowest is also the most important thing to do,.

Gas stations have to regularly clean the magazine of the underground oil tank, don't you need the car tank, don't you need the car oil circuit. In this question, you can directly add 2 Siyoupu fuel additive additives to the fuel tank to clean it, so the oil circuit will burn badly if it is dirty, and it will shake if it burns badly. You can learn from it.

Pacific Automobile Network] 1A dirty throttle can cause idle jitter. 2.

A faulty spark plug can cause the vehicle to shake rapidly. 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.Deterioration of the rubber parts inside the engine mounts and transmission mounts can cause the car to shake at idle.

The so-called "idling" refers to the minimum speed at which the car can maintain stable engine operation without load. Idle condition is an important indicator of engine operating quality. Generally speaking, the larger the engine displacement of a car, the slower its idle speed will be.

Of course, the idle rpm is not only related to the displacement of the engine, but also to the temperature of the engine.

Normally, when the temperature of the engine is relatively low, the engine ECU will increase the amount of fuel injected to increase the idle speed, so that the engine can reach the temperature standard for normal operation. As the temperature of the stool gradually increases, the idle speed will slowly decrease. In the winter, the hot cars that are often made are made using this principle.

Generally, the lower the temperature, the longer the cold car will idle.

There are also many people who wonder if the car will stall when the engine speed is lower than the idle speed. Strictly speaking, the idle speed is actually the lowest stable speed of the engine. If the engine speed is lower than the idle speed, it will only operate unstable and shake violently, and will not stop directly.

As for the common problem of idling and shaking cars, if it is a cold car, it may be caused by excessive carbon deposits in the engine. If it is a hot car, it is a bit complicated to analyze the cause of idle jitter. Engine failure, low pressure in the fuel supply system, and severe carbon build-up in the ignition plug can all lead to idle jitter.

Therefore, it is still necessary to pass the examination of professionals before it can be judged.

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