Audi A62 4 unstable idle why

Causes of unstable car idling;

Throttle oil and throttle carbon deposits, dirty intakes, blocked intakes can cause idle pulling, throttle carbon deposits or oil are the most common causes of unstable idling.

Spark Plug Failure: Weak sparks caused by individual spark plug failures can also cause carbon deposits, which can be cleaned to restore spark plug activity, but some spark plugs have a fast lifespan and can reduce performance.

Blocked oil circuits: There are also oil circuit blockages and intake pipe failures represented by fuel injectors. When the oil circuit represented by the injector is blocked, the fuel supply pressure is insufficient, the fuel atomization is poor, the mixing ratio is unbalanced, and the combustion is incomplete, which leads to related failures.

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 unstable and jitter at idling;

1. The most common cause of vehicle shaking is that the throttle 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.

Idle power may not work, clean the air inlet to try.

The car won't start

The idle speed is unstable, the speed is high, the speed is low, and the inspection items are as follows:

1. The battery voltage of the car DAO is low; Specific detection method: use three purposes.

Answer: Test the battery voltage of the meter voltage level, if it is below 10V, it is recommended to replace it. If it is around 11V, it is barely used; Be prepared for replacement. It can be used above 12V;

2. Check whether it is caused by carbon deposits; If you travel about 20,000 km, focus on checking and cleaning the throttle;

3. Inspect, test and replace spark plugs;

4. Confirm the quality of the gasoline added;

5. Detecting the ignition switch;

6. Test and detect the starter, gasoline pump, sensor and other related components of the starting and oil supply system;

7. After powering on, do not start immediately, wait for 30 seconds to 1 minute, and then ignite; See if it works;

Regardless of any of the above situations, pay attention to the time when the car cannot be hit once, be sure to play again after an interval of 15-30 seconds to protect the battery but not generate power and prolong its service life.

The meaning of a 6-cylinder misfire is: it does not ignite (also called not working). Because the 6th cylinder is not working, the engine shuddes when idling.

Most of the reasons for idle shaking, difficulty in starting, high idle speed, excessive exhaust gas, and inability to refuel are problems such as carbon deposition caused by poor combustion, which must be cleaned. Clean up the carbon deposits on time, and conventional vehicles must also clean the carbon deposits every six months or 10,000 kilometers. Cleaning can be done with some no-dismantling cleaners.

There is indeed such a phenomenon, the legs leaning on the side of the door have a slight continuous shaking, changing all kinds of accessories can not work, and later under the guidance of a master, add three Si Youpu fuel additives fuel additives in the fuel tank and use them continuously, this slight jitter disappeared. Probably ran 2 tanks of gas, the kind of jitter of idling and waiting for the red light and the jitter of d when the door is gone, it's quiet and smooth Now, you can learn from it.

Audi A6, the idle speed is a little shaky, the refueling is weak, and the fault code always shows the 6-cylinder fire After a lot of testing and maintenance, replacement parts, it is now certain that there is no problem with the accessories of the machine, and the only thing that has not been certified and tested is the combustion quality. Idle shaking, most of the simple boils down to bad combustion, it is very simple to deal with, because the fuel of the fuel tank can not guarantee that there are no impurities for a long time, and it is not guaranteed that the oil circuit is not dirty, because the gas station is regularly clean the underground oil tank, not to mention the oil circuit of the family car, the oil circuit of the adhesive paper impurities and moisture participate in the combustion on the fire and lack of cylinder shaking, this link you do not have the first six words, you can use the fuel tank three times to have fuel additives, and then run three tanks of oil, if it is really caused by the dirty oil circuit, This phenomenon will disappear and the engine will be smooth. There is no smoothness, and there is nothing wrong with regular cleaning.

You can learn from that. My colleague was shaking and changing the accessories before, and the cleaning was done well.

Hello, the common problem caused by unstable idle speed is that there is a problem with the throttle or the waste valve, the waste valve you can judge by yourself, when the vehicle is idling, to screw the cover of the oil filler, if the suction is particularly large and can not be pulled out, it is the waste valve is broken, and a new one can be replaced, if it is easy to pull it out, it means that the waste valve is fine, it may be a problem with the throttle, then you have to go to the service station to check and repair it, I hope my answer can help you [The car has a problem, ask the car master. 4S shop professional technician, 10 minutes to solve. 】