Where to jam the ugr. Egr valve in a diesel engine

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 nitrogen 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 vehicles 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 USR 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 km of run, 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, wrench 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 blende of the USR valve comes out 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 turn off the EGR valve in a specialized center. The wizard removes a 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.

EGR (abbreviation for Exhaust Gas Recirculation) is an exhaust gas recirculation system. According to EGR technology, some of the exhaust gases are returned to the air intake system to form a combustible mixture.

The system does not improve the running parameters of the engines internal combustion rather the opposite. EGR installation in vehicles is intended for:

• reducing the toxicity of exhaust gases, primarily the level of nitrogen oxide in exhaust gases;
• introduction of an additional degree of environmental control of the vehicle;
• reduction of detonation processes;
• more complete combustion of fuel;
• fast warming up of the inlet air duct.

In cars of the last years of production, EGR failure can block the correct operation of engines at high revs and speeds. There is special software that reprograms the engine control unit.

EGR valve - what is it and why is it needed

The temperature of the exhaust gases is very high, therefore, for reliable operation, it is made of durable high-alloy steel that can withstand temperature loads up to 2000 degrees Celsius. However, such steel does not have sufficient strength, especially at high temperatures. Therefore, the EGR valve does not have a high service life.

Principle of operation

Reducing the concentration of nitrogen oxide in the exhaust gases of internal combustion engines is achieved by artificially lowering the oxygen content in the input mixture. This is achieved with the help of an EGR valve, which bypasses part of the exhaust gases, in which almost all of the oxygen has already been burned out during the ignition of the working mixture, into the inlet air duct.

Thus, the oxygen concentration in the inlet circuit decreases, the combustion of the air-fuel mixture occurs at lower temperatures, and toxic nitrogen oxide is formed with a lower intensity.

Of course, this reduces the efficiency of the engine, its power, but these are the severe requirements for the environmental friendliness of vehicle operation.

If the EGR valve for some reason does not work or is deliberately blocked, the engine control unit (especially the release after 2010) gives a command to limit the supply of the fuel-air mixture, that is, artificially "chokes" the engine.

Video - about the EGR system:

The blocking of the exhaust gas recirculation system is done in the following cases:

• excessive wear of the piston group, the presence of oil in the exhaust gases in order to prevent contamination of spark plugs and ignition failures;
• forcing the engine, chipping;
• refueling with low-quality fuel, leading to premature contamination of the valve;
• violation of the algorithm of the EGR system.

Exhaust gas recirculation classification

V modern cars There are three types of EGR algorithm implementation:

Electronic

Installed on most vehicles after 2010. The control comes from the engine control unit by means of pulses supplied to the stepper motor of the multistage device. Such a valve works not only in the "open-closed" positions, but is able to partially open the recirculation path, which increases the accuracy of the system.

Pneumatic

It is controlled by a vacuum valve that controls the pressure in the intake system.

Electro-pneumatic

This system is used when multiple valves are required to be controlled.

The control algorithm for the EGR valve (s) can be organized based on the readings of the following sensors:

• exhaust gas pressure sensor;
• EGR sensor;
• gas temperature sensor;
• vehicle speed sensor;
• differential pressure sensor at the outlet and inlet of the EGR valve;
• flow meter;

It is not a fact that the readings of all of the above sensors will participate in the EGR valve control process. Each manufacturer independently develops an algorithm for the operation of the system. But in all cases it is rather complicated.

In diesel engines, the EGR valve is usually triggered to open at idle speed. The amount of the by-passed waste mixture can reach 40 - 50%. As the engine warms up, it closes.

In gasoline engines, the valve closes when the engine is idling and, conversely, when the load is increased. The recycling rate is usually around 10%.

Causes of malfunction

The main causes of EGR malfunction are:

• low-quality fuel, leading to the formation of excessive carbon deposits, can damage the valve after 10,000 - 20,000 km;
• problems with setting the angle of ignition of an internal combustion engine;
• wear valve stem seals, decrease in compression, other engine problems associated with the presence of oil in the exhaust gases;
• malfunction of electrical equipment;
• violation of the signal processing algorithm by the engine control unit;
• increased oil level;
• wear of injectors;
• natural mechanical wear of the valve, which usually occurs after 60 - 80 thousand km of car mileage.

Signs of a malfunction of the EGR valve

The main signs of malfunction and failure of operability are as follows:

1. Clogged valve can lead to seizure during operation, as well as an increase in response time. Jamming contributes to reduced engine power, erratic idle speed, black smoke in diesel engines. Untimely closing of the valve contributes to more "hard" work, increased fuel consumption.
2. Permanently open valve USR leads to a noticeable decrease in power and, as a result, to a decrease in its throttle response.
3. Valve failure leads to a complex malfunction of the EGR system, which is usually indicated by the "CHECK ENGINE" indicator on the dashboard and possible symptoms:

• unstable idle speed;
• increased smokiness;
• decrease / increase in power;
• increased engine noise;
• detonation.

In cars with high mileage before the year 2000, the failure of such a valve may not manifest itself in any way, therefore, periodic (preferably before the next autumn / winter and spring / summer seasons), as well as before undergoing a technical inspection, it is recommended:

• make an external examination of the wiring, connectors, pipes leading to the EGR valve;
• check ("ring") the coil of the USR solenoid valve;
• carry out computer diagnostics of the engine control unit.

Video - about the signs of a malfunction of the EGR valve:

Computer diagnostics of the ECM usually monitors the following parameters of the EGR system:

• recirculation coefficient;
• duty cycle of PWM (pulse-width modulation) pulses, if this type of EGR valve control is used;
• the on / off state of the valve during normal impulse control.

Replacing or cleaning the EGR valve

It is usually located on the left side of the engine compartment or on the engine compartment bulkhead. It can be easily found by the two hoses and the electrical connector connected to the valve (in the case of a solenoid valve).

Video - how to clean the EGR valve on a Honda Fit:

Its assembly and disassembly during replacement or cleaning usually does not cause technical problems... In this case, the following requirements must be met:

• apply high-temperature sealant to the threaded connection of the thermal valve;
• use a new gasket during installation;
• to prevent leaks, observe the tightening forces of the threaded connections (specified in the repair instructions);
• check the tightness of the connection of the vacuum tubes, the correctness of the connection.

Removing it (stub)

Many car owners (especially aged vehicles) turn off the EGR system. This happens when:

• the USR valve is out of order and the car owner does not want to spend extra money on its purchase;
• the piston group is badly worn out, burnt oil gets into the exhaust gases, a strong carbon deposit is formed, which, in the case of recirculation, greatly contaminates the working volume of the engine and spark plugs, increases the smoke;
• sometimes removing the USR valve temporarily restores idle speed and throttle response of the engine that has gone a bit too far.

For cars up to the year 2000, when removing the USR valve, it is enough to disconnect its electrical connector. In some cases, in this case, then it is better to muffle the pipes leading to the valve. This will not cause a malfunction in the vehicle's electrical equipment.

In the event that the control winding in the solenoid valve is out of order, it is possible to turn on a conventional relay or an internal incandescent light bulb in parallel with the valve for emulation so that the engine error does not light up.

Video - is it worth turning off (muffling) EGR:

If the EGR system is turned off in cars after 2005, there may be big problems associated with the electrics.

Basically, the USR system is turned off in the process of improving the dynamic characteristics of the engine, called "chipping". What is exhaust gas recirculation? It is similar to the fact that you will again run the exhaled air into your lungs. Yes, of course, the level of harmful exhaled substances will be less, but it will also become more difficult and unpleasant to breathe. This is how many motorists reason, and not without reason.

Video - how to properly muffle the EGR valve on a VAG:

There are many service stations that provide software EGR shutdown services. Then it is possible not to make any mechanical and electrical changes in the engine control system. You just need to reflash the control unit software.

Video - about EGR and particulate filter:

Some car enthusiasts, who have, are making attempts to self-reprogram to remove EGR, using firmware and programs posted on the Internet. It is very risky, it is better to turn to professionals.

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 lower 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 an environmental point of view, the system performs a positive function by 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, are covered with carbon deposits during the operation of the system, 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 example:

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 position sensor throttle, air temperature sensor on the intake manifold 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-pneumatic and (standards EURO 2 and EURO 3) and completely electronic(EURO 4 and EURO 5 standards).

Types of EGR valves

If your vehicle is equipped with 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. As a result, an uncontrolled intake manifold occurs. If your car has an engine with, this can lead to a lean fuel mixture. 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.

Dirty valve is the second common problem. What to do with it and how to clean it, we will analyze it below. Note that the slightest engine malfunction can 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;
• 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 operation of the exhaust gas recirculation valve - the electronic system of the car signals a check light.

When diagnosing, error codes such as:

• P1403 - malfunction of the exhaust gas recirculation valve;
• P0400 - 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 equipment which 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. Purge the device without letting air 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 allowing air to 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 muffle the EGR valve?

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

It should be noted right away that one chip tuning is not enough... That is, disabling the ECU control of the valve 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 automakers include special valve plugs with the car. As a rule, this 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 in the place where the valve is attached. 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 aligned 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 ones 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 breakdown indicator on the dashboard is triggered (check light);
• an increase in fuel consumption is possible;
• 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.

At cleaning the EGR pneumatic valve necessary from carbon deposits clean the seat and stem... At cleaning the USR with a control solenoid valve, usually, the filter is being cleaned protecting 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 flip the terminals from the battery, as well as the connector from it. Next, using the key, 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 valve, soaked in advance, is off and ready to be disassembled. To do this, unscrew the bolts and disassemble. Then, with the help of lapping paste, we carry out the lapping of 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. We wait for 5 minutes 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 malfunction, you must repeat the above procedure. The assembly of the system is carried out upside-down.

EGR valve replacement

In some cases, in particular, if the valve fails, it is necessary to replace it. 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, several operations must be performed, in particular, those related to the computer, resetting information, so that the electronics “accept” the new device and does 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 disc 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 intended 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 not complicated, and as a rule, on all machines it is not very difficult. If you ask for help at a service station, then there the replacement procedure costs about 4 ... 5 thousand rubles today, regardless of the brand passenger car... As for the price of the EGR valve itself, it fluctuates between 1,500 ... 2,000 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, 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 the sensors installed in the system. This can result in one or more of the following signs of “illness”:

• unstable engine operation (jerks, floating idle speed);
• loss of dynamic characteristics (accelerates poorly, shows low 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 may be signs of other malfunctions, however, it is still recommended using computer diagnostics check the mentioned unit. 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 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.

If the exhaust gas recirculation system fails, many owners are interested in the question of how to muffle the EGR valve on gasoline and diesel. Problems with this system are very difficult ways to fix them. But it is necessary to look for them and eliminate them, since the car can "die" at the most inopportune moment, and for a long time. Difficulties in diagnostics are felt mainly because not all workshops have the necessary equipment, and without it, sometimes it is simply impossible to find the problem and fix it.

How to turn off the EGR valve on gasoline and diesel will interest drivers also because the performance of this system largely depends on the quality indicators of gasoline or "diesel fuel" of our filling stations. Experts describe this system as a big and sudden headache. The USR valve belongs to the category of expensive spare parts, therefore, in many cases, car owners prefer excluding it instead of replacing it.

About the principle of operation of the device

The idea of ​​using this unit is that at certain operating modes of the power unit, an additive occurs and some part of the exhaust gases are mixed with the air entering the intake valve. The high combustion temperature of the air-fuel mixture contributes to an increase in nitrogen oxide in the exhaust gases.

The combustion process is impossible without the presence of oxygen, and the addition of exhaust gases slightly reduces its concentration in the fuel mixture, this leads to a decrease in the combustion temperature, which means that the toxicity of the exhaust gases will decrease. This system has been designed specifically to protect the environment.

When the engine speed increases, the regulating device closes in proportion to the increase in the engine speed. The engine warms up only when the valve is closed. In petrol versions, it does not open at all when idling, and also when maximum torque is needed. In other cases, it can be open by about 5-10% of the possible bandwidth.

Possible system malfunctions

If there is a clogging of the shut-off device, then it may slow down its movement or come to a complete stop. If its "wedge" occurs, instability at idle speed begins to appear in the operation of gasoline engines. If it slows down while moving, gas mileage will steadily increase. Diesel engines are getting tough. The deceleration results mainly only in interruptions when idling.

Most often, the EGR regulating device fails, which regulates the passage of exhaust gases into the intake system. He has to work in high temperature conditions, so it is this part that is most likely to fail. The most important problem is leakage. The locking device of most of the machines is driven by a pneumatic system, but an electric drive is also used. In the first case, the valve is controlled, and in the second case, by control signals from the electronic engine control unit.

How to drown it?

In all documents that regulate the operation of vehicles, it is said that EGR units have limitations in terms of service life. They prescribe the replacement of the elements of this unit with a run of about 70-100 thousand kilometers, but operating experience shows the validity of this statement only for high-quality fuel. Careful maintenance allows you to extend its service life, but sometimes you have to exclude the USR sensor.

This is not at all difficult to do. It is enough to cut a plate out of thin sheet along the contours of this sensor. It is necessary to ensure good tightness of its installation. You should also carefully inspect the valve stem. In some designs, it may protrude beyond the landing plane. In this case, you will need to drill a hole in its diameter, after which you can install the gasket.

I would like to say a few words about the possible consequences of such "modernization". If the warning lamp on the display will light up, the emission of toxicity of exhaust gases will increase. You know how to turn off the EGR valve on gasoline and diesel, therefore, what to do with it is up to you. As a result, I would like to say that if it works, do not touch it, but if problems arise, you can get rid of it.

When switching to injection engines, it was noticed that the combustion temperature of the fuel-air mixture became higher than was typical for internal combustion engines equipped with a carburetor. And the return of part of the exhaust gases to the inside of the cylinders, oddly enough, allows you to slightly lower the combustion temperature, which leads to a decrease in the formation of nitrogen oxides. In general, EGR was invented to achieve good environmental performance. Note that this system is not activated all the time, but only at low revs or when starting from a standstill. But even then, its work noticeably "strangles" the engine.

What do we want to achieve?

It would seem that the exhaust system of a car is the simplest part of its design, and nothing can be improved here. But recently, a lot of "improvements" have appeared, allowing either to increase the operational parameters of the internal combustion engine, or to reduce the toxicity of the exhaust. The use of direct-flow mufflers, as well as active noise suppression systems - all this is necessary for the car owner, but not for the environment. But catalysts, sometimes used in conjunction with intercoolers, or systems of the "EGR" class, are already inventions pleasing to environmentalists. It is easy to see that the environmental friendliness of an engine cannot be improved without lowering its power, torque, etc.

When we start a cold engine, the EGR valve remains closed, and exhaust gases cannot enter the intake manifold. As soon as the coolant temperature exceeds 80-90 C, this valve can be opened under certain conditions. The following tuning method is known: the exhaust gas flow to the EGR valve can be shut off, for which a plug is installed. Such tuning has easily predictable consequences:

• The engine runs at full strength all the time (good);
• The maximum combustion temperature rises (bad);
• Inside the cylinders there will be only a mixture of fuel and clean air (also good);
• The catalysts will quickly fail (very bad!).

Based on the above estimates, it will be necessary to decide whether it makes sense to carry out the revision we are considering. It is clear that after its completion, the engine will be removed from the warranty, so we will leave the choice to the owner. First you need to make sure that the EGR system is in power unit really has a presence: it is used in conjunction with GDI engines, as well as with TDI "diesels". But the same cannot be said about turbocharged gasoline engines.

Tuning methods

Depending on the design of the engine as a whole, more precisely, on the design of the EGR system, different methods of closing the exhaust return flow channel are used. You can unscrew the pipe that supplies the exhaust gases to the EGR valve and install a plug (a circle made of thin PCB) over the rubber washer. In Japanese cars, the pipe is usually made of a copper alloy, and it is screwed to the valve body with a nut. Pay attention to the photo on the left, and everything will become clear.

GM vehicles use a two-piece EGR valve (see first picture). The top of this structure is attached to the bottom with two metric bolts. Having unscrewed them, you can see a metal gasket, one of the holes of which must be closed. In general, you can make a similar can gasket, but one that does not have the strikethrough hole. As you can see, nothing complicated. Some people recommend making the specified part from sheet chrome-plated brass.