During the operation of a diesel engine with an EGR system, especially after a run of several tens of thousands of kilometers, the owners often complain about a decrease in the power of the power unit and smoke from the diesel engine. There is also an opinion among tuning enthusiasts that the exhaust gas recirculation system "chokes" the engine, preventing the power unit from fully realizing the power output. For this reason, many drivers decide to drown the EGR valve.

In other words, the EGR valve plug is actually a shutdown of the exhaust gas recirculation system, which eliminates possible problems with this solution and add power to the engine. Next, we will take a closer look at why the exhaust gas recirculation system is muffled, as well as where to muffle the EGR valve on a diesel engine and how to do it correctly. Exhaust Gas Recirculation (EGR) is a solution that reduces the level of nitrogen oxides in the exhaust gases of a gasoline or diesel engine. This system as applied to modern internal combustion engines is absent only on gasoline turbo engines. For diesel engines, there are various requirements for emission standards. For this reason, EGR in a diesel engine can be implemented in different ways.

The main function of the EGR system is to partially return the exhaust gases back to the engine intake manifold for afterburning. The USR of a diesel engine makes the operation of engines of this type softer and smoother, gasoline units with EGR suffer less from detonation. The exhaust gas recirculation system is able to improve the performance of a diesel or gasoline internal combustion engine and reduce fuel consumption. Engine exhaust from the USR becomes less toxic.

Why turn off the EGR valve

To begin with, the EGR system is installed on a diesel engine to comply with the stringent environmental regulations and standards that apply in developed countries. EGR is primarily intended to reduce the level of nitrogen oxides in engine exhaust gases. The system partially redirects the exhaust gases back to the intake manifold, due to which the amount of oxygen in the fuel-air mixture is reduced, the formation of nitrogen oxides becomes less intense and the toxicity of the exhaust is within the specified standards. The EGR valve opens at the right time, allowing a portion of the total exhaust gas to flow back into the intake for supply to the engine cylinders. As practice shows, the EGR valve is often clogged during operation. The need to muffle the EGR arises due to the fact that soot and other exhaust components quickly disable the specified element, the clogged system prevents the supply of clean air for the most efficient combustion of diesel fuel. On high-quality European diesel fuel, cleaning the EGR valve may be required once every 40 or even 60 thousand km. Driving on domestic diesel fuel makes the specified procedure to be performed every 20-30 thousand km. Moreover, the relevance of equipping the engine with such a system is questioned by many experts. Disabling the USR naturally leads to an increase in the level of emissions of nitrogen oxides. In parallel with this, emissions of soot, carbon dioxide and carbon monoxide are significantly reduced. Also, after disabling the USR system, fuel consumption decreases, since the amount of oxygen in the intake increases and the mixture burns more efficiently in the cylinders. In other words, the usefulness of such an exhaust recirculation system is questionable. Environmental performance improves marginally compared to loss of engine power, increased fuel consumption and EGR service costs. There are also separate statements that the rapid fouling of the EGR valve and the supply of exhaust to the intake lead to increased carbon formation and coking of the combustion chamber. Malfunctions of the EGR system, which are often associated with incorrect operation of the EGR valve, lead to unstable engine operation and increased fuel consumption. Soot and tar gets into the engine, the process of accelerated oxidation of diesel engine oil takes place, which greatly affects the overall service life of a diesel engine. The need to turn off the USR system often arises on runs of about 80-120 thousand km. The fact is that after such a run, the engine wears out a little. The exhaust gases that are redirected to the intake have a higher degree of contamination. Further, they are mixed with crankcase gases, and the result is the appearance of a thick layer of tarry deposits in the intake manifold, on the EGR valve, and also on the valves of the engine itself. The intake flow area becomes clogged with deposits, the diesel engine gradually loses power. A clogged EGR valve leads to errors, the car may suddenly go into emergency mode. It is quite obvious that in such a situation it is necessary to urgently repair the exhaust gas recirculation system or to turn it off by muffling the EGR valve.

How to muffle the USR valve with your own hands

To begin with, the correct shutdown of the EGR system involves: ➤ mechanical damping of the valve; ➤ software shutdown in the control unit; At the initial stage, a mechanical plug of the USR valve is installed. Further, the shutdown of the EGR system is carried out using electronic equipment. It should be added that only on some models it is enough to physically muffle the Ugr valve. Often, after the mechanical shutdown procedure, software shutdown of the EGR valve in the control unit is additionally required. Otherwise, the ECU will record an error in the operation of the exhaust gas recirculation system, “check” is displayed on the instrument panel, the engine goes into emergency mode with limited power output. In general terms, the most simplified version of the EGR valve plug installation assumes: 1. Removing the valve. The specified element is most often located in the area of \u200b\u200bthe intake manifold and is fastened with several bolts. 2. If necessary, the intake manifold is additionally removed and the intake manifold channels are cleaned from dirt. 3. Next, you need to remove the gasket, which is located in the place where the valve is attached. 4. After removal, the gasket plays the role of a template, according to which it is necessary to cut out from the steel sheet a similar in shape, but completely blind stub gasket. The plug will only have holes for the mounting bolts.

Please note that the plug will come into contact with hot exhaust gases under pressure during operation. For this reason, it is necessary to make a gasket of the appropriate thickness in order to exclude the possibility of its rapid burnout. We add that the ready-made plug of the EGR valve is also available on the free market. To order a solution suitable for a specific model, you can use the search on specialized automotive forums.

5. The next step is the reverse installation of the Egr valve. At the attachment point, a standard gasket and a new plug are combined. Be careful when retightening the bolts as they may be fragile. 6. At the end, it is necessary to implement the disconnection of the vacuum hoses, since it is no longer necessary to open the valve by means of the vacuum system. 7. The final step in the recirculation shutdown procedure is to make adjustments to the firmware of the engine control unit in order to programmatically disable the EGR error.

Advantages and disadvantages of turning off the USR

The only drawback of removing the USR can be considered an increase in the toxicity of exhaust gases. There are many more advantages. After plugging the EGR valve on a diesel engine, the owners note a sharper response to pressing the gas pedal in moderate loads, the so-called turbo lag effect on turbodiesels becomes less noticeable. During operation under load, the engine emits less smoke, the service life of the particulate filter increases, and the intervals between cleaning it increase. The service life of the engine oil is also extended, the engine is better cleaned, less prone to coking and wear.

It should be noted that although there is no noticeable increase in diesel engine power after disabling the USR system, the motor becomes more responsive, and the car itself feels more dynamic when driving.

Finally, we add that if a decision is made to make a power chip tuning of a diesel engine or to install a tuning box on a diesel engine, then disabling the exhaust gas recirculation system is an extremely recommended procedure.

Exhaust Gas Recirculation (or EGR) has an environmental function. This system is the norm for a modern car, which contains many programs. It is used to recirculate exhaust gases during engine operation. At the same time, the system clogs the intake manifold and intake valves, which negatively affects the machine itself. The presence of pros and cons of this system divide the owners into two sides, those who care about the environment, and those who are not indifferent to the fate of the car.

Do I need to muffle the EGR valve? Experts answer if the engine mileage exceeds 100 thousand km - it is worth turning it off.

Many inexperienced motorists do not know why to turn off the EGR valve. In its work, the engine converts gases into nitric oxide. This is what modern ecologists consider the enemy of nature. Disabling the EGR valve, in their opinion, is not always effective for engine operation. A contaminated system can further damage the engine. The malfunction leads to a decrease in engine power and an increase in fuel consumption.

How does the valve turn off

Not wanting to waste time and money, many drivers decide to use an independent mechanical disconnection of the USR, the consequences of which can be unpredictable. From electronic failures to minor breakdowns.
You can familiarize yourself with the correct technique on how to muffle the USR valve in the video, where experts explain in detail and step by step what to do and how to do it.

However, this does not guarantee a positive result in your case. Any specialist recommends contacting the service, where the EGR valve is turned off programmatically and mechanically.

Pros and cons of removing USR

Nitric oxide is formed in the engine system when exposed to high temperatures. It will be released in large quantities after system shutdown. Therefore, the USR valve plug is definitely a minus for the environment.
Removing the system will lead to a cleaner engine and an increase in its dynamic performance, which is an absolute plus for the car.
After turning off the EGR, the engine "breathes" with fresh air, and not with exhaust gases.

Diesel fuel and USR

Diesel-fueled cars are a separate topic and it is worth weighing everything up before shutting off the EGR valve on a diesel engine.
Car owners often complain about reduced power and engine smoke.
The myth that disabling the EGR valve on a diesel engine increases engine power is refuted by the tests carried out by scientists. Power is increased due to the absence of carbon deposits on the walls of the intake manifold, channels and the valve itself.
Answering the question of how to properly muffle the EGR valve on a diesel engine, you should pay attention to two mandatory steps:

• Mechanical damping of the valve.
• Software shutdown in the control unit.

Valve replacement and deception

Having passed diagnostics in a specialized center, you can replace parts that are worn out or broken. Replacement of the USR is required every 100 thousand kilometers, sometimes less, depending on the type of fuel. So, the use of high-quality European diesel fuel requires cleaning the valve every 40-60 thousand km, and domestic diesel fuel requires cleaning the USR system every 30-40 thousand km. Replacing the original one requires certain costs.
The vastness of the Internet offers how to deceive the USR valve. For manufacturing you will need:
thin aluminum, drill, drill for 8, key for 10 - 12, grinder, patience and ingenuity.
Using the old gasket, we draw a drawing of the boundaries on a piece of aluminum, we cut and grind these lines with a grinder. With a drill we make holes for the studs.

The EGR valve can be muffled by yourself

There are drawings and videos on the Internet to more clearly understand how it all looks.
To change, you need to remove the old one. First, the decorative cover is removed (if any), then 2 bolts and the valve itself are removed with a key. The old gasket is removed and a new one is put in its place.
Thus, the USR valve snag is several times cheaper than the original part.

Having decided to remove the software system on your car, it is important to remember that it is better to muffle the USR valve in a specialized center. The wizard removes the special valve from the engine and carries out full software maintenance, checking for system errors. A new program is also being installed that is responsible for the ecological function.
At first glance, the procedure is quite simple, but it is not. It requires maximum attention and knowledge of the master. There are many factors that he should pay attention to before shutting down the system.

Europeans are very concerned about environmental protection. To reduce the formation of nitrogen oxides in internal combustion engines, an exhaust gas recirculation system is used.

An important element of this system is the EGR valve. It redirects part of the exhaust to the intake manifold, dilutes the fuel mixture with exhaust gases. As a result, the temperature in the cylinder drops, and the formation of harmful oxides decreases.

Many car owners strongly doubt the benefits of an exhaust gas recirculation system, which, moreover, greatly complicates the diagnostic procedure. But

More precisely, the installation of the EGR valve plug does not affect the entire exhaust system. There is also an opinion that a lot of unnecessary parts in a car are needed by manufacturers only to increase the cost of an iron horse and drivers put a plug on the USR valve without any problems.

When it is required to plug the EGR valve

The EGR valve is muffled in two cases:

- to increase the power of the unit;

- in case of EGR breakdown, when the computer gives an error, and there is nothing to replace.

How to put a plug on the EGR valve?

The easiest and fastest way is to install the EGR valve plug. To do this, unscrew the fastening bolts and remove the valve. Further, according to the shape and size of the USR mount, you need to cut out the plug. Thick stainless steel is best, if not available, a tin plate will do. Do not forget that the exhaust temperature is quite high, the plate will be in hot conditions.

It is better to plug the hose suitable for the EGR valve with a bolt of the appropriate diameter. Install the cut-out plate instead of the USR valve by placing washers under the bolts. The plug must be seated on silicone sealant and the bolts must be shortened as the EGR valve body is thicker than the plate.

After this procedure, which takes no more than half an hour, the computer should not give an error. But if the "brain" is stubborn, you will have to reprogram the BC. Each car model has its own nuances for installing the EGR plug.

Related Videos

Good luck to everyone and a minimum of breakdowns!

The main part of the Exhaust Gas Recirculation system. USR problem consists of reducing the level of formation of nitrogen oxides, which are a product of the activity of the engine. In order to reduce the temperature, some of the exhaust gases are sent back to the engine. The valves are installed on both gasoline and diesel engines, except for those with a turbine.

From the point of view of ecology, the system performs a positive function, limiting the production of harmful substances. However, the work of the USR is often the source of numerous problems for motorists. The fact is that the EGR valve, as well as the intake manifold and working sensors during the operation of the system are covered with carbon deposits, which is the cause of unstable engine operation. Therefore, many car owners do not resort to cleaning or repairing, but to muffling the entire system.

Where is the EGR valve

The mentioned device stands directly on the engine of your car. In different models, the design and location may be different, however, you need navigate by the location of the intake manifold... Usually a pipe comes from it. The valve can also be installed on the intake manifold, in the intake tract or on the throttle valve block. For instance:

The EGR valve for Ford Transit VI (diesel) is located in front of the engine, to the right of the oil dipstick

The EGR valve on the Chevrolet Lacetti is visible immediately when the hood is opened, it is located behind the ignition module

The EGR valve on the Opel Astra G is located under the upper right corner of the engine protection cover

Some more examples:

EGR valve on BMW E38

EGR valve for Ford Focus

EGR valve for Opel Omega

What is an EGR valve and types of its designs

A certain amount of exhaust gases is sent through the EGR valve to the intake manifold. Then they are mixed with air and fuel, after which they enter the engine cylinders along with the fuel mixture. The amount of gases is determined by a computer program embedded in the ECU. Sensors provide information for making decisions by the computer. Usually this is a coolant temperature sensor, an absolute pressure sensor, an air mass meter, a throttle position sensor, an intake manifold air temperature sensor, and others.

The EGR system and valve do not work continuously. So, they are not used when:

• idle speed (on a warm engine);
• cold engine;
• fully open damper.

The first units used were pneumomechanical, that is, they were controlled using the vacuum of the intake manifold. However, over time they became electro-pneumaticand (standards EURO 2 and EURO 3) and completely electronic (EURO 4 and EURO 5 standards).

Types of EGR valves

If your vehicle has an electronic EGR system, it is controlled by an ECU. There are two types of digital EGR valves - with three or two holes. They are opened and closed by operating solenoids. The device with three holes has seven recirculation levels, the device with two - three levels. The most perfect valve is the one whose opening level is performed using a stepper motor. It provides smooth regulation of the gas flow. Some modern EGR systems have their own gas cooling unit. They further reduce the level of waste nitrogen oxide.

The main causes of system malfunction and their consequences

Depressurization of the EGR valve - the most common malfunction of the USR system. The consequence of this is an uncontrolled intake manifold. If your car has an engine with, it threatens to be lean. And when there is an air flow pressure sensor in the car, the fuel mixture will be re-enriched, due to which the pressure on the intake manifold will increase. If the engine has both of these sensors, then at idle it will receive a too rich fuel mixture, and in other operating modes - a lean one.

Valve clogging is the second common problem. What to do with it and how to clean it, we will analyze it below. Please note that the slightest engine malfunction could theoretically lead to a significant potential for contamination.

All malfunctions occur for one of the following reasons:

• too much exhaust gas flows through the valve
• too little exhaust gas passes through it;
• there was a depressurization of the valve body.

Exhaust gas recirculation malfunction can be caused by breakage of the following parts:

• external branch pipes for supplying exhaust gases;
• eGR valve;
• a thermal valve connecting the vacuum source and the EGR valve;
• solenoids that are controlled by the ECU;
• exhaust gas pressure converters.

EGR valve symptoms

There are a number of signs indicating that problems are observed in the operation of the EGR valve. The main ones are:

• unstable engine idling;
• frequent engine shutdown;
• misfiring;
• jerky movement of the car;
• a decrease in vacuum at the intake manifold and, as a consequence, the operation of the engine on a rich fuel mixture;
• often in the event of a serious malfunction in the exhaust gas recirculation valve - the car's electronic system signals a check light.

When diagnosing, error codes such as:

• P1403 - malfunction of the exhaust gas recirculation valve;
• P0400 - an error in the exhaust gas recirculation system;
• P0401 - inefficiency of the exhaust gas recirculation system;
• P0403 - wire breakage inside the control valve of the exhaust gas recirculation system;
• P0404 - malfunction of the EGR control valve;
• - too lean fuel mixture.

How to check the EGR valve?

When checking, it is necessary to carry out inspection of the condition of the tubes, electrical wires, connectors and other components. If your machine has a pneumatic valve, you can use vacuum pump to activate it. For detailed diagnostics use electronic equipmentwhich will allow you to get the error code. With such a check, it is necessary to know the technical parameters of the valve in order to identify the discrepancy between the received and declared data.

The check is performed in the following sequence:

1. Disconnect vacuum hoses.
2. Blow out the device, while no air should pass through it.
3. Disconnect the connector from the solenoid valve.
4. Use the wires to supply power to the device from the battery.
5. Blow out the valve, while air must pass through it.

When the check showed that the unit is not suitable for further operation, then the purchase and installation of a new one is required, but quite often, it is advised to simply drown the USR valve.

How to plug the EGR valve?

If problems begin in the operation of the system or the EGR valve, then the simplest and cheapest solution will be to silence it.

It should be noted right away that one chip tuning is not enough... That is, disabling valve control via the ECU does not solve all problems. This step only excludes system diagnostics as a result of which the computer does not generate an error. However, the valve itself continues to operate. Therefore, in addition it is necessary to perform a mechanical exclusion of it out of engine operation.

Some car manufacturers include special valve plugs with the car. As a rule, it is a thick steel plate (up to 3 mm thick) shaped like a device hole. If you do not have such an original plug, you can make it yourself from metal of the appropriate thickness.

As a result of installing the plug, the temperature in the cylinders rises. And this threatens the risk of cylinder head cracks.

Next, remove the EGR valve. On some car models, this also requires removing the intake manifold. In parallel with this, clean its channels from dirt. Next, find the gasket that is installed at the valve attachment point. Then replace it with the metal plug mentioned above. You can make it yourself or buy it at a car dealership.

During the assembly process, the standard gasket and the new plug are combined at the attachment point. It is necessary to carefully tighten the structure with bolts, since factory plugs are often fragile. After that, do not forget to disconnect the vacuum hoses and put plugs in them. At the end of the process, it is necessary to perform the mentioned chip tuning, that is, to make an adjustment to the ECU firmware so that the computer does not show an error.

How to drown the USR

We jam the USR

What results will jamming the USR system lead to?

There are positive and negative sides. The positive include:

• soot does not accumulate in the collector;
• the dynamic characteristics of the car are increased;
• no need to change the EGR valve;
• not so frequent oil changes.

Negative sides:

• if the engine has a catalyst, then it will fail faster;
• the breakage indicator on the dashboard is triggered (check light);
• possible increase in fuel consumption;
• increased wear of the valve group (rarely).

EGR valve cleaning

Often, you can restore the EGR system by simply cleaning the device. More often than others, owners of Opel, Chevrolet Lacetti, Nissan, Peugeot cars encounter this.

The service life of various EGR systems is 70 - 100 thousand km.

When cleaning the EGR pneumatic valve necessary from carbon deposits clean the seat and stem... When cleaning the USR with a control solenoid valve, usually, filter is cleanedprotecting the vacuum system from contamination.

To clean, you need the following tools: open-end and spanner wrenches, two carburetor cleaners (foam and spray), a Phillips screwdriver, and valve lapping paste.

EGR valve cleaning

After you have found where the EGR valve is located, you need to fold the terminals from the battery, as well as the connector from it. Next, using a wrench, unscrew the bolts that hold the valve, and then take it out. The insides of the device must be soaked with a carburetor rinse.

It is necessary to flush the channel in the manifold with a foam cleaner and a tube. The procedure must be performed within 5 ... 10 minutes. And repeat it up to 5 times (depending on the level of pollution). At this time, the pre-soaked valve is off and ready to be disassembled. To do this, unscrew the bolts and disassemble. Then, using lapping paste, we grind the valve.

When lapping is done, it is necessary to thoroughly wash everything, both scale and paste. Next, you need to dry everything thoroughly and collect. Also definitely worth it for tightness... This is done with kerosene, which is poured into one compartment. For 5 minutes, we wait so that the kerosene does not flow into another compartment, or on the back side, no moisture appears. If this happens, then the valve is not sealed tight. To eliminate the problem, repeat the above procedure. The assembly of the system is carried out upside-down.

EGR valve replacement

In some cases, in particular, when the valve fails, it must be replaced. Naturally, for each car model, this procedure will have its own characteristics due to the design, however, in general terms, the algorithm will be approximately the same.

However, immediately before replacing, you need to perform several operations, in particular, those related to the ECU, reset information, so that the electronics “accept” the new device and do not generate an error. So, you need to follow these steps:

• check the vacuum hoses of the exhaust gas recirculation system;
• check the operability of the USR sensor and the entire system;
• check the patency of the gas recirculation line;
• replace the EGR sensor;
• clean the valve stem from carbon deposits;
• remove the fault code in the ECU and test the operation of the new device.

As for the direct replacement of the mentioned device, we will give an example of its replacement on the Volkswagen Passat B6 car. The work algorithm will be as follows:

1. Disconnect the valve head position sensor connector.
2. Loosen the clamps and remove the cooling hoses from the valve connections.
3. Unscrew the screws (two on each side) on the fasteners of the metal pipes for supplying and removing gases from / to the EGR valve.
4. The valve body is attached to the engine with a bracket with one power bolt and two M8 screws. Accordingly, it is necessary to unscrew them, remove the old valve, install a new one in its place and tighten the screws back.
5. Connect the valve to the ECU system, and then use the software (it may be different) to adapt it.

As you can see, the procedure is simple, and as a rule, on all machines it is not very difficult. If you ask for help at a service station, then the replacement procedure there costs about 4 ... 5 thousand rubles today, regardless of the brand of the car. As for the price of the EGR valve itself, it fluctuates between 1500 ... 2000 rubles and even more (depending on the car brand).

Diesel Malfunction Symptoms

The EGR valve is installed not only on gasoline, but also on diesel engines (including turbocharged ones). And the most interesting thing in this vein is that during the operation of the mentioned device, the problems described above for a gasoline engine for a diesel engine are much more relevant. First, you need to address the differences in the operation of the device on diesel engines. So, here the valve opens at idle speed, providing about 50% of clean air in the intake manifold. As the number of revolutions increases, it closes and closes at full engine load. When the motor is in warm-up mode, the valve is also fully closed.

The problems are primarily related to the fact that the quality of domestic diesel fuel, to put it mildly, leaves much to be desired. During the operation of a diesel engine, contamination occurs directly on the EGR valve, the intake manifold, as well as sensors installed in the system. This may result in one or more of the following signs of “illness”:

• unstable engine operation (jerking, floating idle speed);
• loss of dynamic characteristics (accelerates poorly, shows little dynamics even in low gears);
• increased fuel consumption;
• decrease in power;
• the engine will work more “hard” (after all, the EGR valve in diesel engines is just needed to soften the operation of the engine).

Naturally, the listed phenomena can be signs of other malfunctions, however, it is still recommended to check the mentioned unit using computer diagnostics. And if necessary, clean, replace or simply drown it.

Another way out is to clean the intake manifold and the entire corresponding system (including the intercooler). Due to low-quality diesel fuel, the entire system becomes significantly contaminated over time, therefore, the described malfunctions may be the result of just banal contamination, and will disappear after you perform the appropriate cleaning. This procedure is recommended to be done at least once every two years, and better - more often.

Due to the poor quality of the fuel mixture in this system, as well as in the intake manifold and installed there, carbon deposits may appear (if the system is not regularly cleaned), and this will lead to unstable operation of your car's engine. Directly itself is expensive, because of this, many motorists, in the event of a valve breakdown, do not change it to a new valve, but prefer to muffle the entire system. Whether it is correct or not, you will learn from this article.

What is EGR valve

The valve's operation scheme is quite simple - part of the gases from it mixes with air from the exhaust manifold. If the percentage of nitric oxide is too high, then this leads to a large temperature regime in the combustion chamber. We all, from school, know that oxygen acts as a catalyst for combustion. And the gases from the intake manifold, mixing with the air flow, minimize the percentage of oxygen. As a result, the combustion temperature decreases and toxicity decreases.

How the USR system works

Everything will depend on the engine on which such a valve is installed. In diesel engines, the valve will be open already at idle speed and will provide 50% of the intake air. As soon as the engine speed rises, the valve will gradually close. And it will close completely as soon as the engine speed reaches its maximum value. When the engine warms up, the valve will also be completely closed. During idle speed of the internal combustion engine, the EGR valve will be closed, and it will not turn on at maximum engine speed. In other operating modes of the engine, the EGR valve supplies air to the intake from 5% to 10%.

What can be the malfunctions of the EGR valve

Failure of the EGR valve, in most cases, occurs when carbon deposits accumulate on the plate and it needs cleaning. This is due to poor fuel, or if the fuel system is malfunctioning, the cylinders are badly worn, the turbocharger is faulty, the sensors (responsible for the valve operation) are out of order.

If the EGR valve becomes clogged and it is not cleaned regularly, this can lead to the fact that it will jam or will work very slowly. The EGR valve can jam both for opening and closing. When jammed to open, the gasoline engine will not work well at idle, while the diesel engine will significantly increase fuel consumption and reduce power. When the USR valve closes, the gasoline engine will consume more fuel, and the diesel engine will start to work more "hard". If the valve opens slowly, it will mostly be noticeable when the engine is idling.

How the USR system works and the cause of breakdowns:

If you have not decided to shut down the system, then malfunctions may be in the following elements:

1. The main component is the EGR valve. It bypasses gases from the intake to the exhaust manifold. This valve constantly interacts with a hot environment, and this is the most vulnerable part of the entire system. The main fault is valve depressurization. The system can operate under the control of electrics (mainly GM vehicles) and pneumatics (most car brands).

In the event that the valve is opened electrically, this happens as a result of the readings of a special sensor that transmits a signal directly to the engine. The next method, which is responsible for the operation of the valve, is electro-pneumatic.

1. EGR solenoid... It is located in a system where the valve is controlled pneumatically. The main malfunction remains the same - depressurization.
2. EGR valve opening position sensor. Sometimes it happens that they fail, but in this case they only light up, signaling that the engine is malfunctioning. There are no other consequences.

Different systems may have a different set of constituent elements, but the main one is the EGR valve. Let's see how all these breakdowns can affect the performance of a car engine.

It was said above that the main malfunction is depressurization, as a result of which there is an uncontrolled suction of air masses into the intake manifold.

As a consequence, this can lead to the fact that:

• Air mass meter engine - fuel becomes leaner due to the presence of supplemental oxygen.
• Engine with pressure sensor - the fuel will be additionally enriched due to the increase in the pressure in the intake manifold.
• Engines that use both of these methods to control oxygen levels will have a dramatic increase in the fuel mixture at idle and lean at other engine operating conditions.

In all cases, when the oxygen level becomes lower in the air that enters the engine, the ignition of the fuel in the engine cylinders is impaired. We can say that the dependence here is quite complex and, in view of this, the failure of the USR system is quite complex and on different brands of cars it can manifest itself in different ways.

An important indicator will be the level of exhaust gases that enter the intake manifold. In other words, the USR valve opening indicator is of interest. It will also be affected by the overall percentage of engine wear (spark plugs, fuel pump, or clogged fuel injectors).

Now let's talk about how the fuel system will affect the failure of the EGR valve, if you do not decide to shut off the system. Each control unit has special software that balances the idle speed and the quality of the fuel in the car. In this case, the level of opening or closing of the mechanism that regulates the idle speed, as well as the duration of the injection, have a specific indicator. When the control unit balances the idle speed in different operating modes, it will not cope with the quality of the fuel mixture.

This is due to the fact that when the driver presses the gas pedal, the pressure in the exhaust manifold of the exhaust gases entering the intake manifold increases. This can lead to a deterioration in the dynamics of vehicle acceleration and unstable operation of the vehicle engine. Then the picture will change. When hot gases mix with oil vapors in the manifold, this can lead to the accumulation of more carbon deposits inside the manifold, on the intake valves, the outer parts of the nozzles become dirty and soot appears on the spark plug contacts. Because of this, it will become more difficult to start the engine, poor idling, jerking of the car and uneven engine operation will appear. And if you sharply press the gas pedal, then there will be flashes in the intake manifold. To avoid this, timely cleaning of all these elements is necessary, and in an emergency, you can drown it.

What to do if the EGR valve is out of order?

If you open the manual for any car, then it says - the USR system has a limited uptime. Already when the car has run from 70,000 to 100,000 kilometers, it is necessary to completely replace the entire system, but this is only if you have good fuel. In Russia, this period (due to the low quality of fuel) is much lower and amounts to 50 thousand kilometers.

But what if the car enthusiast cannot afford to replace expensive components in such a short time? Here you can advise two ways - timely cleaning of the entire system should be carried out, or simply drown out the entire USR system.

EGR valve cleaning, video

What should you pay attention to first of all?

1. Directly the EGR valve. To ensure that the valve travel is sufficiently free and the valve stem is tightly closed, cleaning is required for the valve stem and seat. It is better to use an aerosol with which the carburetor is cleaned. But you have to be careful not to let the liquid fall directly onto the diaphragm. This can lead to its destruction (the components included in the composition can decompose the rubber).
2. If there is, then you need to pay attention to the USR solenoid. In most cases, there is a small filter that protects the system vacuum from contamination. This filter needs cleaning.

In some cases, the USR system can simply be drowned out. What can it do if you decide to mute the entire system?

Positive points:

• Carbon deposits do not accumulate in the collector.
• Vehicle dynamics is improved.
• No valve replacement required.
• The oil can be changed less frequently.

Negative points

• In the presence of a catalyst, it will fail faster.
• The check on the instrument panel lights up (if the system is not turned off)
• Fuel consumption may increase (not all models).
• Valve group wear (in rare cases).

As a result, we can say that if the valve is functioning properly, then let it work. And if problems begin with it, then the most radical and cheapest, from a financial point of view, option would be if you shut down the entire system. This will not lead to big consequences in the operation of your car.

Good luck on the road!

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