I disabled it myself. How? I'm telling you. Taken from the Ford Focus website However, the light does not light up. The engine sound is more growling. Consumption has not changed, 18-22 liters in the city. It pulls noticeably better.

EGR stands for Exhaust Gas Re-Combustion System, suction process exhaust gases back into the engine burning them again. This is a technique that destroys pollutants emitted by the engine.

DPFE means "- Feedback EGR pressure drop

DPFE sensor - reads changes in EGR system pressure.
EGR drive - electrical device, which allows you to control the EGR valve using vacuum.
EGR valve is a vacuum controlled flap that opens and allows exhaust gases to move away from exhaust manifold before intake manifold for recycling.
Description of EGR and DPFE systems:
There is a vacuum tube from the intake manifold to the EGR drive. The actuator is located on the firewall and it is an electrical device controlled by PCM (PULSE CODE MODULATION) which determines how much vacuum force is needed. From there, another hose goes to the EGR valve. The drive uses vacuum to open the EGR valve, which in turn allows traffic fumes from the exhaust manifold, through the DPFE sensor, into the intake manifold.
When gas is pumped through the EGR valve, the flow goes through the DPFE sensor. There is a pressure difference, one tube has a larger cross-section than the other. The DPFE records the amount of pressure difference and can tell you how much exhaust gas the EGR system is pumping. This tells the PCM how much is being pumped, and the PCM (PULSE CODE MODULATION) uses this data to control the drive.

DPFE Sensor Failure: When the DPFE sensor starts to wear out, it gives PCM (PULSE CODE MODULATION) information incorrectly. DPFE The sensor is less sensitive and the PCM thinks that less gas is being burned than it actually is. Trying to compensate, the PCM opens the drive too much. This excessive amount of EGR mixed with air entering the intake manifold causes the failure, this is a classic example of a DPFE sensor failure.
The DPFE sensor in the Focus is not very good and requires replacement (every 30k miles and sometimes even less).
Please note that the final death of the DPFE sensor is a very slow process, and engine self-diagnosis will not be determined until the DPFE sensor dies completely.
If you notice that the car is stalling and think that it might be due to a DPFE sensor failure, perform one of the repairs listed at the end of this article. If the delay disappears, then your DPFE sensor is more than likely the cause.
Of course, replacing the bad DPFE sensor is the recommended solution to this problem. However, the work listed in this article does not require much time and gives good result, which will not cause any damage and will not cause any error indication unless the DPFE sensor is completely bent. The work will take a few minutes, which is also good for quick diagnostics to find out (whether it’s the EGR system that’s coming out, or what kind of misfortune has started...)

Identification of EGR system components

On most Focuses, the DPFE "Flight Data Recorder" sensor (not my idea) is bolted to the firewall in the center, with 2 rubber hoses running down from it, and a 3-wire connector going into it perpendicular to the firewall. These 2 rubber hoses come down to the EGR port which is a 1/2" diameter pipe

Either way, follow the EGR pipe until you see 2 metal taps next to each other, then follow the rubber hoses they have on them to the DPFE sensor.

All this will do is prevent your EGR valve from being able to open...
If your car performs like crap, do this. If this fixes the problem, then you will know that it is your DPFE sensor that is failing, or less likely, some other EGR fault.
Basically all the problems on many Focuses were related to DPFE. This malfunction causes the "Insufficient EGR Flow" error.

Remove the hose from the EGR valve and both hoses from the DPFE sensor, connect the hose that went to the EGR valve to the passenger side inlet of the DPFE sensor. (It's thinner) These are the only remedies if your DPFE sensor is failing but not completely dead. Instead of opening the EGR valve when the PCM (PULSE CODE MODULATION) commands, it will now apply vacuum to the DPFE sensor and thus the sensor will see a larger pressure drop, more than the sensor sees with a normal connection, so the PCM will think the EGR valve is working properly...
If the DPFE sensor is completely removed, you will get "Insufficient EGR Flow".

You can use this option or return to the original one without fear of damaging anything.
Advantage:
When connected this way, hot exhaust gases do not destroy the DPFE sensor, so the DPFE sensor will last longer.
Don't forget to plug the 2 metal taps on the larger EGR channel pipe where the DPFE sensor was previously connected. The tip of a screwdriver (like a cap, like on a pen) or something that will plug the tube tightly to cut off the air will do...

Photo of the work done, with a “wall-mounted” DPFE sensor. Note that the vacuum tube that went into the top of the EGR valve is now connected to the DPFE sensor with passenger side, (there is a small problem here, the hose that went from the EGR drive to the EGR valve has an internal diameter of 4 mm and it is oak, and in order to pull the DPFE sensor onto the DPFE sensor it needs to be 7 mm, I left a 3 cm thick hose on the fitting; an adapter from a dropper 7- 4mm and a hose from the drive...) from the other DPFE outlet the hose is removed by itself.
If you mix up the hoses when replacing the sensor, nothing will be wrong, but there will be no point.

They write that in this way you can postpone the purchase of a new sensor for an indefinite time...
Did: He drove not bad before, but now the thoughtfulness has completely disappeared after pressing the gas pedal, it’s nice... We’re not so poor that we would drive twice on the same gasoline, it’s the bourgeoisie who are choking on biodiesel, biogas, and they and vodka is diluted before drinking...

You provide one hundred percent hydrocarbon raw materials.

Yes, and the light bulb calmed down, that’s also bullshit

Every year, automakers pay increasing attention to environmental issues. Enormous amounts of money are spent on improving such systems.

The largest player in this market, the company, was no exception Ford. It actively invests millions of dollars in projects to reduce its harmful impact on the environment.

As a result of the introduction of strict standards in this direction, engineers developed and implemented Exhaust gas recirculation system, or EGR for short, for gasoline and diesel power units.

What is its meaning?

It effectively neutralizes the harmful effects of nitrogen oxides, which helps reduce the level of harmful emissions and accordingly increases the European engine standard.

The principle of its operation boils down to the fact that in certain engine operating modes, at idle and low speeds, some of the exhaust gases flow from the exhaust manifold directly into the intake manifold, at high speed their number is reduced by the activity of a special valve.

Thus, when these gases are mixed with oxygen, the content of the latter is reduced. As a result, a decrease in combustion temperature is observed, which directly affects the reduction of toxicity.

According to experts working condition This system in a diesel engine leads to a reduction in the emission of soot microparticles by 10%, which, to some extent, affects the reduction in the growth of cancer.

The principle of operation of the EGR valve using the example of Ford Transit

This model is very popular in the segment commercial vehicles, where high annual mileages are observed. In this regard, when purchasing, the choice falls on diesel modifications equipped with an EGR system.

Its most important component is the valve, and the existing differences boil down to the way it is controlled. Thus, it can be electro-pneumatic, which complies with Euro-2 and Euro-3 standards, as well as electronic - Euro-4 and Euro-5.

Main function of this device is to regulate the amount of exhaust gases entering the intake manifold.

A painful choice: environmental safety or personal financial health

Over time, the quality of our fuel will Ford Transit EGR valve becomes clogged with soot, which prevents its correct operation.

The question arises about replacing it or plugging it. The first option is preferable, however, on a 2.5D engine, even the manufacturer himself allows for a procedure for neutralizing it.

It should be remembered that the malfunction of this component of the exhaust gas recirculation system has a much worse impact on the environment than its complete shutdown.

Ford Transit Connect LWB, 1.8 TDCi, 110 hp › Logbook › EGR valve Ford Torneo Connect(part 1)

They fitted me with a used manifold for testing with an EGR valve. What happened to this unit and why it was dismantled is not clear. Apparently the valve was stuck, but the donor wasn’t sure.
The outside of the unit is intact, without damage.

In any holes, dense layers of oiled and slightly coked soot are observed, in some places up to 2 mm wide. There are no terrible growths, as in some photos on the Internet.

I begin to disassemble the EGR valve from the plastic electronic part with the chip. First I unscrew the 4 screws on the cover. Everything unscrewed and the lid came off easily. Everything inside is spotless, like new, the rubber gasket is intact. No violations were found.

Now I'm removing the iron electro-mechanical part. Also 4 screws. The unit unscrewed and disconnected without any hindrance. The photo shows that in this part there is an electric motor, which, using a gear, rotates the toothed crescent, and it again opens, or, in other words, closes itself valve The USR is installed permanently in the manifold housing. No visible defects were found in this unit either.

Cleaning valve EGR and intake tract Ford Connect 1.8TD

Error P0489. Restoring functionality EGR valve(USR) on Ford Connect 1.8 turbo diesel. By using.

Ford Transit Connect turn off the EGR valve

Exhaust Gas Accounting System Elimination Process USR.

The valve stem moves suddenly and easily, and there are no jams. Why anyone ever considered it faulty, I have no idea.
However, since I have partially disassembled it, I will bring what I started to its logical conclusion - remove the rolled valve, clean the manifold, etc. But this will happen tomorrow or the day after tomorrow, the next reason will be written about this fact.

Ford Transit Connect 2008, diesel engine 1.8 l., 110 l. p., front drive, manual transmission - do-it-yourself repair

45

Where is the next reason part?

There is no part 2 yet, since I have not finished this epic yet. It lies half disassembled, waiting for me to have time for it. Once I do, I will certainly share the information. In general, cleaning there is not particularly difficult; there is, of course, information about this on the Internet.

I turned it off and threw the samovar away. The consumption dropped to normal, the smoke disappeared. The check does not glow, because The EGR servo drive turned out to be not burned out and it does not give the brain any reason for an error to appear. Even at a theoretical level, the EGR can only have a negative impact on consumption if it is not working properly. How can secondary distillation of waste have a beneficial effect on consumption - well. However, getting a portion of soot back into the cylinders and dirt into the intake is a great help for the engine. My UAZ is also turned off again. And the collector is clean, and there are no malfunctions.

What is EGR?
EGR - exhaust gas recirculation system. From the name it is clear that during its work this system returns part of the exhaust gases from the exhaust to the intake manifold. The main task of the system is to reduce exhaust toxicity in warm-up and sharp acceleration modes of the engine, which in these modes runs on a rich fuel mixture. In general, nothing complicated, but why does this system make life so difficult for many who repair cars?
First of all, let's look at the composition of the system:
1) the main part is the EGR valve. Provides bypass of gases from the exhaust to the intake manifold. Due to constant contact with hot gases, it is the least durable part of the system. The main one, she is also the most main problem- leakage. IN different modifications EGR systems can be controlled either electrically (most GM vehicles) or pneumatically (most vehicles).
2) EGR solenoid. Used in systems with pneumatic valve control. The main malfunction is the same as for the valve - leakage and the engine operation is affected in the same way as as a result we also get an open EGR valve.
3) EGR valve stem position sensor / EGR valve opening degree sensor. It happens that they break down, but apart from the engine malfunction lamp coming on, there are no unpleasant consequences not visible.
4) engine control unit.
Different systems may have a different set of components, but the common one is the EGR valve. Let's consider how its malfunctions affect the operation of the engine. I have already written that the main malfunction is a leak and it allows additional air to leak into the intake manifold.
As a result we have:
In engines with an air flow meter (MAF sensor) - depletion of the fuel mixture caused by the presence of air not taken into account by the MAF.
In engines with a pressure sensor (MAP sensor) - enrichment of the fuel mixture caused by an increase in pressure in the intake manifold.
In engines using both methods of controlling the amount of air (due to the significant error of the MAF sensor at low flow through the sensor), we have an enrichment of Idling and sharp depletion in transient modes ( Japanese cars - the brightest examples).
And in all cases, due to a decrease in the amount of oxygen in the air entering the engine, the combustion of the fuel mixture in the engine cylinders is disrupted. In general, the relationship is very complex and therefore the malfunction of the EGR system is different models cars manifest themselves in different ways. The amount of exhaust gases entering the intake manifold (i.e., the opening value of the EGR valve) is of great importance. general state engine (spark plug wear, problems fuel pump or clogged fuel injectors, rotation speed and engine load. Are you wondering how the condition is? fuel system does it affect the symptoms of malfunction? The fact is that any engine control unit has a program according to which it seeks to stabilize the idle speed and the composition of the fuel mixture. Moreover, the amount of regulation of the degree of opening/closing actuator Idle speed control systems and injection timing have understandable limits. When the control unit manages to stabilize idle speed, in transient modes it will not cope with the necessary correction of the mixture composition, since pressing the accelerator pedal will lead to an increase in pressure in the exhaust manifold and an increase in the amount of exhaust gases entering the intake manifold, which do not contain what is necessary for combustion oxygen. At this stage, all this will worsen the acceleration dynamics of the car, and dips and jerks may appear when driving. But then the picture of the malfunction will change. The fact is that hot gases interacting with oil mist in the intake manifold (if you have forgotten where it comes from, I will remind you about the crankcase ventilation system, PCV valve), will lead to increased carbon formation in the internal parts manifold, carbon deposits on the intake valves, increased contamination of the outer parts of the fuel injector nozzles and the appearance of soot on the spark plug insulators. All this will affect the starting characteristics of the engine and unstable speed idling, and it is possible to jerk and misfire, as well as floating speed. At sharp pressing gas may cause flashes in the intake manifold. If you do not pay attention to the car at this stage, then very soon the idle speed will disappear completely, or its value will exceed all permissible limits. And on cars with automatic transmission, a high idle speed will very quickly lead to gearbox failure.
What to do about it? Any repair and maintenance manuals say that the EGR system has a limited resource. Ideally, it is necessary to replace all components of the system at a mileage of 70-100 thousand kilometers, but this is true for sufficiently quality fuel. WITH Russian gasoline I could recommend that you replace all components at 50,000 kilometers. Although in times of crisis this is unrealistic for many.
What should those who cannot afford to purchase expensive components or do not have the opportunity to purchase necessary spare parts. One piece of advice - timely service system will extend its service life. What can and should be serviced in it?
Firstly, the EGR valve itself. It is necessary to clean the valve seat and stem to ensure tight closure and free movement of the valve. To do this, it is very convenient to use carburetor cleaning liquid in an aerosol package. However, be careful, liquid getting on the diaphragm can cause its destruction, since the substances included in the aerosol decompose the rubber.
Secondly, the EGR solenoid (if equipped). As a rule, it contains a small filter to protect the vacuum system from dirt getting into it. It is this filter that needs to be cleaned.
Well, that’s the whole list of elements that need periodic maintenance. By the way, it is this kind of maintenance that can bring many systems back to life. Many - but not all.
Is it possible to turn off the system and normalize engine operation? It is possible, quite enough, to cut out a gasket for the EGR valve from thin sheet metal without cutting holes for the passage of gases. Look carefully at the valve; if the stem protrudes beyond the seating plane, be sure to make a hole under it. That's all, but I immediately want to upset the owners of many Fords - the EGR performance monitoring system will definitely light up the MIL. So you have to put up with the light on dashboard. It’s easier for Chrysler and GM owners - with this shutdown, the lamp does not light up

The main part of the exhaust gas recirculation system (Exhaust Gas Recirculation). USR task 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 those with a turbine.

From an environmental point of view, the system performs a positive function by limiting production harmful substances. However, the operation of the USR is often a source of numerous problems for motorists. The fact is that the EGR valve, as well as the intake manifold and working sensors, become covered with soot during system operation, which is the reason unstable work engine. Therefore, many car owners resort not to cleaning or repair, but to shutting down the entire system.

Where is the EGR valve located?

The mentioned device is located directly on the engine of your car. IN various models execution and location may be different, however, it is necessary navigate by the location of the intake manifold. Usually from him there is a pipe. The valve can also be installed on the intake manifold, in the suction tract or on the throttle valve block. Eg:

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

The EGR valve on the Chevrolet Lacetti is visible immediately when you open the hood; it is located behind the ignition module

The EGR valve on the Opel Astra G is located at the upper right corner protective cover engine

A few more examples:

EGR valve on BMW E38

EGR valve for Ford Focus

EGR valve on Opel Omega

What is an EGR valve and types of its designs

A certain amount of exhaust gases is sent through the EGR valve into the intake manifold. Next, 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 computer program, embedded in the ECU. Sensors provide information for computer decision-making. This is usually the coolant temperature sensor, sensor absolute pressure, air flow meter, position sensor throttle valve, air temperature sensor on the intake manifold and others.

The EGR system and valve do not operate constantly. So, they are not used for:

• 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 electropneumatic And ( EURO standards 2 and EURO 3) and completely electronic(EURO 4 and EURO 5 standards).

Types of USR valves

If your car has electronic system EGR, it is controlled by the ECU. Digital EGR valves there are two types- with three or two holes. They open and close using operating solenoids. A device with three holes has seven levels of recirculation, a device with two has three levels. The most perfect valve is the one whose opening level is achieved using stepper motor. It provides smooth regulation of gas flow. Some modern systems EGRs are equipped with their own gas cooling unit. They can 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, uncontrolled flow occurs in the intake manifold. If your car has an engine with , this risks a lean fuel mixture. And when the car has an air flow pressure sensor, the fuel mixture will be over-rich, which will cause the pressure on the intake manifold to increase. If the engine has both of the mentioned sensors, then at idle speed it will receive too rich fuel mixture, and in other operating modes - lean.

Valve contamination- the second common problem. We will discuss below what to do with it and how to clean it. Please note that the slightest malfunction in the engine can theoretically lead to a significant likelihood of contamination.

All malfunctions occur for one of the following reasons:

• too much exhaust gas passes through the valve;
• too little exhaust gas passes through it;
• The valve body has depressurized.

A malfunction of the exhaust gas recirculation system can be caused by failure of the following parts:

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

Signs of a bad EGR valve

There are a number of signs that indicate that there are problems with the operation of the EGR valve. The main ones are:

• unstable engine operation at idle;
• frequent engine stops;
• misfires;
• the car moves jerkily;
• reduction of vacuum on the intake manifold and, as a consequence, engine operation on a rich fuel mixture;
• Often, if there is a serious malfunction in the operation of the exhaust gas recirculation valve, the car’s electronic system signals a check light.

During diagnostics, error codes such as:

• P1403 - malfunction of the exhaust gas recirculation valve;
• P0400 - exhaust gas recirculation system error;
• P0401 - ineffectiveness of the exhaust gas recirculation system;
• P0403 - broken wires inside the control valve of the exhaust gas recirculation system;
• P0404 - malfunction of the EGR control valve;
• - fuel mixture is too lean.

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 is equipped with a pneumatic valve, you can use vacuum pump to put it into action. For detailed diagnostics, use electronic equipment which will allow you to get the error code. During such a check you need to know technical specifications valve in order to identify discrepancies between the received and declared data.

The check is performed in the following sequence:

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

When a check shows 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 turn off the USR valve.

How to turn off the EGR valve?

If there are problems with the operation of the EGR system or valve, then the simplest and cheapest solution is to turn it off.

It’s worth mentioning right away that one Chip tuning is not enough. That is, disabling valve control through 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 from 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 the hole of the device. 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 increases. And this threatens the risk of cracks in the cylinder head.

Next, remove the EGR valve. On some car models, this also requires removing the intake manifold. At the same time, clean its channels from dirt. Next, find the gasket that is installed at the valve mounting location. After this, replace it with the metal plug mentioned above. You can make it yourself or buy it at a car store.

During the assembly process, the standard gasket and the new plug are aligned at the mounting location. It is necessary to tighten the structure with bolts carefully, since factory plugs are often fragile. After this, do not forget to disconnect the vacuum hoses and put plugs in them. To complete the process, it is necessary to perform the mentioned chip tuning, that is, make adjustments to the ECU firmware so that the computer does not show an error.

How to turn off the EGR

We turn off the USR

What results will the jamming of the USR system have?

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 like that frequent replacement oils

Negative sides:

• if the engine has a catalyst, it will fail faster;
• the breakdown alarm is activated on dashboard(check light);
• possible increase in fuel consumption;
• increased wear of the valve group (rare).

Cleaning the EGR valve

Often, you can restore the operation of the EGR system by simply cleaning the device. Owners of Opel, Chevrolet Lacetti, Nissan, and Peugeot cars face this problem more often than others.

Resource work of various EGR systems is 70 - 100 thousand km.

At cleaning the EGR pneumatic valve necessary for soot clean seat and stem. At cleaning the USR with control solenoid valve, usually, filter is cleaned, protecting the vacuum system from contamination.

For cleaning you will need the following tools: open-end and socket wrenches, two carburetor cleaners (foam and spray), a Phillips screwdriver, and valve lapping paste.

Cleaning the EGR valve

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

You need to flush the channel in the manifold using 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 has become sour and is ready to be disassembled. To do this, unscrew the bolts and disassemble. Then, using a lapping paste, we grind the valve.

When the grinding is completed, it is necessary to thoroughly wash everything, both scale and paste. Next, you need to thoroughly dry and assemble everything. Also Be sure to check the valve for leaks. This is done using kerosene, which is poured into one compartment. We wait for 5 minutes so that the kerosene does not flow into another compartment, or onto back side, no wetness appeared. If this happens, it means the valve is not sealed properly. To resolve the problem, you must repeat the procedure described above. Reassembling the system is performed in reverse order.

EGR valve replacement

In some cases, in particular, when a valve fails, it is necessary to replace it. Naturally, on each car model this procedure will have its own characteristics due to the design, however, general outline the algorithm will be approximately the same.

However, immediately before replacement, you need to perform several operations, in particular those related to the ECU, resetting information so that the electronics “accepts” 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 functionality 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;
• clear the fault code in the ECU and test the operation of the new device.

As for directly replacing the mentioned device, we will give an example of replacing it with Volkswagen car Passat B6. 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 fittings.
3. Unscrew the screws (two on each side) on the fastenings of the metal tubes intended for supplying and discharging gases from/to the EGR valve.
4. The valve body is attached to the engine using a bracket using one power bolt and two M8 screws. Accordingly, you need 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 using software(it may be different) adapt it.

As you can see, the procedure is not complicated, and as a rule, on all machines it does not present much difficulty. If you turn to a service station for help, the replacement procedure there currently costs about 4...5 thousand rubles, regardless of the brand passenger car. As for the price of the EGR valve itself, it ranges from 1500...2000 rubles and even more (depending on the make of the car).

Signs of a diesel engine malfunction

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 gasoline engine for diesel engines they are much more relevant. First, you need to look at the differences in how the device operates on diesel engines. So, here the valve opens at idle, providing about 50% clean air in the intake manifold. As the number of revolutions increases, it closes and closes already at full engine load. When the engine is running in warm-up mode, the valve is also completely 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. In progress diesel engine The EGR valve itself, the intake manifold, and also the sensors installed in the system become contaminated. The consequence of this may be one or more of the following signs of “disease”:

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

Naturally, the listed phenomena may be signs of other malfunctions, but it is still recommended to use computer diagnostics check the mentioned unit. And if necessary, clean, replace or simply plug it.

Another solution is to clean the intake manifold and the entire related system (including the intercooler). Due to low-quality diesel fuel, the entire system becomes significantly contaminated over time, so the described malfunctions may be the result of banal contamination, and will disappear after you carry out the appropriate cleaning. It is recommended to do this procedure at least once every two years, and better yet, more often.