Too rich mixture: causes and solutions from professionals

Modern cars drive the internal combustion engine (ICE). It is characterized by a certain scheme of work. Inside the chamber of this system, a fuel-air mixture burns. This means that, when filling a car with gasoline or diesel, the driver provides only one necessary element for the movement of the vehicle.

Fuel mixes with air. The nozzles spray gasoline or diesel. The fuel evaporates in this case before the valves. In cylinders, a mixture of fuel and air burns out of an electric spark. If the car scanner has issued an error p0172, it means that the system has detected a deviation. . This is a rich mixture . But you can also see for yourself the engine malfunction caused by this problem. How to eliminate it, every car owner should know.

General concept

, Skoda, BMW, Chevrolet и т. д.), следует сказать несколько слов о самом топливе. Going into the concept of what is a too rich mixture (VAZ , Skoda, BMW, Chevrolet, etc.), we should say a few words about the fuel itself. It consists of a gasoline (diesel) and air that is related in a certain proportion. Fuel cylinders are supplied with liquid fuel. This ratio largely depends on this ratio.

Rich is called a mixture in which gasoline is more, and air is less than normal. Since oxygen inside the combustion chamber is not enough, the process of the engine's operation loses power. Gasoline burning out is due to this already in the muffler. Some auto mechanics call this state of fuel high-calorific.

These violations are reflected in the appearance of the spark plugs. They have a characteristic black deposit, soot. The reasons for this state of the engine system may be several. They must be found and eliminated.

When the mixture becomes rich

Deviations in the preparation of the mixture result from certain failures in the vehicle systems. The process of creating fuel meets the injector. He prepares mixtures with a certain percentage of oxygen. It is this ability of the represented engine element that enables the engine to operate in different modes.

If necessary, the driver can, thanks to such a device, increase the speed, cope with the rise, go for overtaking, etc.

определяется математической формулой. A rich mixture on the injector is determined by the mathematical formula. Normal ratio is 1 kg of liquid fuel 14.7 kg of oxygen. If this formula for some reason increases the amount of oxygen, this composition is called poor. If, however, the quantity of fuel rises in the mixture, the mixture acquires the status of rich.

The owner of the car can independently adjust the level of oxygen supply to the fuel mixture. Errors in this process lead to breakdowns and improper operation of the vehicle.

Evidence of deviation

, УАЗ, BMW, Audi и прочих существующих марок автомобилей - может проявляться широким спектром отклонений в работе автомобиля. A rich mixture - VAZ , UAZ, BMW, Audi and other existing brands of cars - can manifest itself in a wide range of deviations in the performance of the car. If such violations occur, it is urgent to find out the cause of this state of the engine.

In vehicles in which the autoscanner is installed, if an abnormality occurs, the indicator with the corresponding error code lights up (P0172). A muffler in this case can make loud claps. This is due to the combustion of air in the exhaust pipe. This is one of the first signs of violations.

In this case, you can see the appearance in the exhaust gases of black, gray shades. This is also associated with an inappropriate way of burning the fuel. The exhaust does not pass any cleaning. There is a large amount of atmospheric oxygen in the tube. Therefore, the exhaust gas acquires a characteristic dirty shade.

Driving

проявляется также при управлении транспортным средством. Too rich mixture is also evident when driving a vehicle. This will immediately notice almost any driver. The machine becomes less dynamic. Engine power is dramatically reduced. Since the combustion process in the motor chamber is slower, the mechanism is not able to work at full strength.

In some cases, the car may not even go. But this is with very serious deviations in the ratio of fuel and air in the combustion chamber.

When driving a car, the owner may notice that the fuel consumption has increased. This is also a characteristic sign of a malfunction of the engine due to work with a rich mixture. This violation is explained simply. The engine is inefficient in such conditions. The fuel mixture is consumed incorrectly. To prevent a low combustion rate, the engine starts injecting more liquid fuel into the chamber.

Main reasons

There are several main reasons that cause deviations in the ratio of air to gasoline. The most important of these may be deviations in the engine management system, as well as disruption of the air damper drive. The failure of the injector can also explain why a rich mixture is determined . при неправильной настройке также способен стать причиной отклонений. The carburetor, if not properly tuned, can also cause deviations. Another factor in the formation of a rich mixture is the clogging of the air filter.

Often, the cause of violations in the fuel system are the wrong actions of the car owner. In order to reduce the consumption of gasoline or increase the power of the motor, the driver may incorrectly adjust the system. As a result, he gets problems with the engine and the need for extraordinary maintenance or even repair.

Fuel supply deviations

Since the process of forming a combustible mixture consists of two main components (gasoline and air), disturbances are possible on the supply side of each of them. Excess fuel is determined much less often than lack of air. But typical fuel infringements should be considered in more detail.

Too rich mixture, the causes of which are related to the fuel system, can be caused by high pressure in the pipeline. This deviation is caused by a malfunction of the gasoline pump or regulation system. To test this version, use a special fuel gauge.

Deviations in the composition of the mixture can cause the adsorber. Through it, due to a malfunction of the vapor recovery system, a large amount of gasoline is admitted.

Also, nozzles may be faulty. The injector when closed may not be able to hold fuel. This causes it to enter the chamber even when the nozzles are closed.

Air supply malfunction

, которую определяет система диагностики автомобиля, гораздо чаще бывает вызвана недостаточным поступлением кислорода в камеру сгорания. The "Rich mixture" error , which is determined by the car's diagnostic system, is more often caused by the insufficient intake of oxygen into the combustion chamber. There are several reasons for this violation.

First of all, the air filter can be elementarily dirty. For some reason (severe operating conditions, driving on dirty roads), this element of the oxygen purification system may become unusable even before the manufacturer's specified time. Therefore, it is necessary to visually evaluate the cleaner. If it is dirty, covered with oil, it must be replaced urgently. Otherwise, the motor will quickly fail.

In some cases, the cause of the defective air supply to the combustion chamber may be a breakdown of the sensor of its flow. This will help to identify the system of scanner readings. Sometimes a malfunction of the air pressure sensor in the collection system is detected.

Automatic diagnostic system

, необходимо предпринять определенные действия. If the vehicle diagnostic system indicates that an "Too Rich Mix" error has occurred , certain actions must be taken. For this you need to understand the principles of the scanner.

Air is supplied to the fuel when the MAP sensor and lambda probe are diagnosed. Maybe the error P0172 is caused by deviations of these systems. However, besides them, problems can be associated with deviations in the thermal clearances (engine with HBO), with mechanical damage to sealing materials, insufficient compression or deflection during the operation of the timing.

To understand why automatic diagnostics indicate such an error, the car owner can perform several actions. First of all, you need to analyze the information provided by the scanner. Next, you can artificially simulate the conditions for the appearance of such a malfunction.

The next step is to check the nodes and mechanisms, for example, contacts, lack of suction, and also the operability of the systems connected with the supply of fuel and oxygen to the combustion chamber.

Troubleshooting System Error

, необходимо произвести ряд действий. If the diagnostic system indicates that the car uses a rich mixture , a number of actions must be taken. A faulty node is found by successively checking each system. For this, the multimeter checks the sensors JOT, MAF, as well as the lambda probe.

If there are no deviations in these systems, you need to pay attention to the candles, coils and wires. The fuel pressure is then measured with a pressure gauge, and the ignition marks are checked .

Then check the seals and connections at the air inlet, as well as the exhaust manifold. The pump should not be. After performing all the manipulations and troubleshooting, reset the fuel feed adjustments. In this case, long-term programs regarding this setting are returned to the original value.

Expert advice

, первое, что рекомендуют сделать опытные автомеханики, это сбросить дополнительные настройки работы инжектора. If a too rich mixture is prepared in the fuel tank, the first thing that experienced auto mechanics recommend is to reset the injector's additional settings. If the owner made independent adjustments of the fuel adjustment system, he could make serious mistakes. A rich fuel mixture will lead to the inevitable breakdown of the motor very soon.

If the cause of the deviations is related to the system of injectors, this can be determined visually. With such a malfunction, traces of fuel combustion appear on the outside of the injector.

Gary and soot can also be found on one side of the sealing copper ring. Such deviations are caused by improper installation of the injector. If the O-ring is not in its place, similar malfunctions are also possible.

Rare breakages

связаны с регулировкой инжектора. Experts argue that 90% of all errors " Rich mixture" are associated with the adjustment of the injector. Eliminating it is not difficult. The main thing is to pay attention in time to the incorrect operation of the car engine.

The most rare, exotic are the faults of the engine control unit, as well as the poor condition of the contacts. Sometimes there are cases of poisoning of the oxygen sensor. An experienced specialist is able to detect such deviations. Independently to solve a problem in this case it is possible not to each owner of the car.

смесь, можно понять опасность возникновения такой ситуации. Having considered what a rich mixture is, one can understand the danger of such a situation. In case of unforeseen situations, it is better to contact the service center. At the maintenance points there is a necessary tool with which you can perform diagnostics. This will save the car engine.