Suzuki liana valve ugr DIY repair

The EGR valve system is designed to recirculate exhaust gases and is located on the engine under the hood of your car. If you turn off the EGR valve, then as a result, the emission of nitrogen oxide into the atmosphere will not be reduced.

The valves are installed both on internal combustion engines (except for engines equipped with a turbine) and on diesel engines. In the first case, the detonation of the engine will be significantly reduced, and in the second, the work will be "softer". And what is important, at the same time, fuel consumption will be reduced.

I must say that EGR valves (EGR) often lead to headaches for domestic motorists. This system is very susceptible to what you put into the car's tank (the quality of the fuel has a greater influence on the performance of the diesel engine). And many people prefer to just drown it out

Due to the poor quality of the fuel mixture in this system, as well as in the intake manifold and the sensors 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 by myself EGR valve It 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 shut off the entire system. Whether it is correct or not, you will learn from this article.

Where Is EGR Valve Located, Clean the EGR

The valve operation scheme is quite simple - part of the gases from the exhaust system 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, even 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.

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 inlet from 5% to 10%.

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 disrupted, the cylinders are badly worn out, the turbocharger is faulty, the sensors (responsible for the valve operation) are out of order.

If the EGR valve gets clogged and it is not cleaned regularly, it can cause it to jam or respond very slowly. The EGR valve can jam both for opening and closing. When jammed to open, the gasoline engine will not idle well, 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 generally be noticeable when the engine is idling.

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 malfunction is the depressurization of the valve. The system can operate under the control of electrics (mainly GM cars) and pneumatics (most car brands).

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

1. USR 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 only the lamp on the instrument panel lights 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 an uncontrolled suction of air masses into the intake manifold occurs.

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 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 acceleration of the car and unstable operation of the car 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, twitching 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.

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.

1. Directly the EGR valve. To keep the valve travel free enough and the valve stem to close tightly, cleaning is required for the valve stem and seat. It is better to use an aerosol with which the carburetor is cleaned. But one must 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?

• Carbon deposits do not accumulate in the collector.
• Vehicle dynamics are improved.
• There is no need to replace the valve.
• The oil can be changed less frequently.

• 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.

Knocking in the front suspension - device and repair

How to check a mass air flow sensor (MAF) - signs of malfunction and repair

1. 

Leave your feedback and questions about the EGR valve

USR Where is the ZAZ Chance 1.5 8 valves?

where is the EGR valve on the 2005 Citroen C3 1.4 automatic

• 

If it is a 1.4 petrol engine, then the EGR valve is absent on them

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SGV 5D 2000 Automatic transmission H25 2257516 air suspension

Under the EGR valve, the gasket must be

I cut it from a beer can.

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SGV 5D 2000 Automatic transmission H25 2257516 air suspension

Jamming has been performed.
I used a can of paint as a gasket =)
planted on a sealant.
I cursed the engineers for such an arrangement of the USR, I was sweating while I put it on, even connecting all the tubes and sensors is babbling.
drowned out the sensor itself. it turned out to be double jamming.
and this plug is easier to install on the removed throttle assembly, the native gasket from the intake tube is hell.

in fact, a full-fledged departure of the car from the garage will be only in half a month or a month. therefore, so far only a process.
I'll start the engine by the end of the week and tell you about the error 😉

I've been looking at the car for the second month now

regarding toxicity and increased combustion temperature, I will still conduct an experiment with water =)
I have an idea, but I will implement it after finishing the car.

I can say for sure not a single manual or brochure on the USR will say that it reduces engine efficiency and clogs the entire intake tract in the trash for marketing reasons.
there were cases when the plant made a bulletin for STOshnik, with the requirement to jam this stuff nafig.
if the engine is not new, it is necessary to turn off the EGR.
about the increase in consumption.
everything is simple here, the USR works in the rpm range from 1500 to 3500, when warming up, not all cars have it, when coasting.
the main task is adjustment to the norms of EURO 2-4, with our gasoline it is contraindicated.
by the way, one more nuance.
on a bmw, let's say there are precedents crankcase gases are squeezed by Egor and hello to the oil seals 😉

Failure of the exhaust gas recirculation system significantly degrades the performance of automobile engines. Timely cleaning of the EGR valve or replacing it if it cannot be restored can improve the operation of the diesel engine and gasoline power units. In particular, detonation of the air-fuel mixture is practically excluded.

Often, when the first signs of malfunctions of the EGR valve appear, it is simply neutralized, thereby deteriorating the operational and dynamic parameters of the vehicle. A plug is installed in the circuit connecting the intake and exhaust manifolds, which prevents the free passage of exhaust gases. As a result, the temperature in the combustion chamber rises, which leads to nitrogen oxidation and incomplete combustion of the fuel. This causes a decrease in power, deterioration of environmental performance.

One of the main signs of failure of the recirculation system is a significant increase in the consumption of gasoline or diesel fuel. EGR valve failure is caused by carbon black deposits on the surface of the pivot plate or seat. Thus, the flow area is reduced, the reactions of the device are slowed down or it is jammed in the open or closed position.

The main reasons for the listed phenomena:

• Violations of ventilation of the crankcase of the power unit.
• Worn injectors of the injection system.
• Increased clearances in the cylinder-piston groups or the occurrence of rings.
• Damage to the turbine unit's rotating blades.
• Failure of the flow meter, lack of tightness of pipeline connections.
• Failure of the vacuum pump.

In some cases, if the device fails, the MIL indicator on the dashboard may light up, indicating a malfunction of the catalytic converter. Diagnostics of malfunctions of the indicated valve involves its removal and inspection in order to make a decision on repair or replacement. If the cause of the defect is not eliminated, then installing a new unit will only give a short-term effect. The device will fail again within a short time.

The formation of deposits on the inner surfaces of the assembly is associated with an increased content of large amounts of unburned fuel and engine oil in the exhaust gases. Troubleshooting of the EGR system is carried out in two ways: by removing contaminants from the working parts of the valve or by replacing the latter. Carbon deposits are removed mechanically or using highly effective chemical solvents.

If an electro-pneumatic recirculation valve is used on the vehicle, the control solenoid must be checked. In the event of a malfunction, the unit cannot be repaired and must be replaced. The technical condition is monitored using a tester or an oscilloscope.

Given the variety of reasons leading to the failure of the indicated device, the diagnosis of its malfunctions presents a certain difficulty for an unqualified master. Self-determination of the recirculation valve malfunction by the car owner for subsequent removal with disassembly or replacement of the unit often does not lead to the elimination of the defect. For example, poorly cleaned> adjacent pipelines will again clog connectors and tubes.

The best solution in such a situation is to contact a certified car service, where the EGR valve will be repaired using a professional tool. Only in a well-equipped workshop with the involvement of qualified personnel is it possible to accurately determine and eliminate the causes of device failure.

Miniatures

All this is very cool and deserves only praise, but there is an easier way to clean, without disassembling the valve.

The technique is simple - the valve stem (especially if it does not fit snugly) is neatly pushed on and fixed in the open position with a bracket like braces that the brake hoses fix (whoever has seen, he knows). You can cut such a bracket yourself from a piece of metal.
Then Proafam1000 is taken and the entire lower part is abundantly sprayed with it every hour - 5-6 times.
Proafam1000 washes and corrodes everything, even your hands.

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EGR valve nexia
More details can be found at the link:

I think this will only delay the problem for a little while. The valve wedges in operation and is likely to fail completely. There is a peculiar principle of operation and soot is not the only culprit for the breakdown.

As far as I know, this is a Euro 3 engine, I did it easier, I made a firmware for my brains for two Euros, and put a blind gasket, closing both holes, drove 10 thousand after that and it seems like all the rules! (I am writing from my wife's account)

this valve on diesel engines has jammed more than once. the system is very bad, because of it, the intake manifold is overgrown with a layer of carbon deposits and the car starts to drive worse and eat more. the best option is to disable this system on a new engine.

guys help me a question: is there EGR on the Opel Astra G 1.8, if so where is it?

THANKS VERY HELPED. BUT I BROKEN MY HEAD

And the fact that there is such a sound inside, is it okay?

The Exhaust Gas Recirculation (EGR) valve and the blow-by gas valve are two different valves and two different systems.

I have an Opel Astra G 1.6 16 valves. Washing had an effect only for a couple of months. After a short time, everything repeated again. Tomorrow I want to buy a new one for replacement. It costs about $ 80 new.

The valve is triggered at 3000 rpm. This is so, for the information of the author of the video.

And so, just in case, EGR for every taste and color. Cheaper than the officials.

I think it will be interesting to everyone -

Thanks for the info, I have a question like this 1:19 is that gray tape on the terminals? )))

it helps temporarily! wherever you look at the USR AND LAMBA PROBE, once a year, we need to change it to the Opel Astra

they say it is impossible to turn it over to the top as it was removed and cleaned, otherwise all the dirt will be poured inside.

A claw ball knocks. You can hear him on the video)))

This valve allows part of, let's say, "air" from the crankcase to the intake manifold. ... This part of the “air is taken into account during the mixture formation. That is - Air from the air filter + fuel from the nozzles + air from the crankcase (this valve sends there) = Total fuel consumption (normal). If this valve is clogged and does not let air out of the crankcase, then the system still counts it (takes it into account) and sends fuel there, taking it into account. And it turns out that the consumption has increased in relation to the mileage traveled. ... From here and high fuel consumption. After cleaning, its consumption returns to normal. Since the air-fuel mixture is already with the calculation of the amount of "air" that this cleaned valve passes through. ))). “AIR” in quotation marks IS THE GASES THAT RUN OUT OF THE COMBUSTION CHAMBER INTO THE CASE through the rings and piston walls.

This is how the diesel works for me.

Yes, this valve is usually thrown away and no more problems.

the valve does nothing to the engine except for its clogging, it must be muffled unambiguously.

Muffle it and that's it, it's the bourgeoisie about the ecology of the type worried, the motors are choking the USRs. And we have more open spaces and fewer people) Instead of a gasket, we insert a deaf plate made of stainless steel or iron and do not think about contamination of this unnecessary part.There are also those who change it for their own money, when they are completely screwed up, but this is already a problem with their heads.

its task is to feed some of the exhaust back into the engine. as a result of which the detonation is extinguished.

there can be no talk of any ecology. and without it, a serviceable engine eats a liter more.

during the flushing process, do not turn it upside down.

the valve was washed and into the sensor for cocoa (((((((((

You can't clean it like that. You twist it like an elephant a carrot and all the washed away dirt flows straight into the selenoid through the stock and settles there tightly. The stem will stick. Hold the USR as it stands and splash from bottom to top so that all this dirt will drain. And it is better to drown it out and forget that it is. Connect the terminal.

This valve from the purchase of Nexia is located somewhere in the vastness of the garbage dump, the flight is normal for 7 years.

And on 16kl. Nexia has such a valve?

MUTE HIM Nafig 105,000 WITHOUT HIM THE FLIGHT IS EXCELLENT

Did you do a second diagnosis? What percentage is opening now?

Why clean it? It must be removed immediately after buying a car. The EGR system only clogs up the engine, but there is no benefit.

No shit you drive - the oil pump on your pants. This is not an oil pump, this is a shit pump in the engine))))

I ran into this situation last week. Suddenly, at idle, the speed began to jump, and it became very difficult to start. At first I thought that I had filled in poor quality gasoline. Tucked in good, did not help. Then I decided to add an additive, the same parsley. He began to sin on spark plugs, bought, changed, the speed jump. I went to the service station to see Dimka, looked at the entire engine, checked it, everything is working correctly. He sent me to an auto electrician. And found the cause of the breakdown

! He said that the Exhaust Gas Recirculation (EGR) valve was clogged. After that, the engine began to work perfectly and start up too.

I have read many times on the forum that many have a problem that the idle rpm is jumping, here are the photos, I hope my little report will help someone.

This is what the sensor itself looks like, it is located behind the engine.

And here he is in open form. As you can see, the hole on the right is clogged with smoke, it needs to be cleaned. I read that after cleaning this valve, the fuel consumption decreases.

8.19 Exhaust Gas Recirculation (EGR) System - General Information, Condition Checking and Component Replacement

Exhaust Gas Recirculation (EGR) System - General Information, Condition Checking and Component Replacement

Functional diagram of a typical EGR backpressure sensor

1 - VRT switch valve
2 - the EGR valve
3 - Electromagnetic EGRС

4 - the EGR temperature sensor
5 - the EGR pipe

1. On models up to 1998 The EGR system consists of an EGR valve, a port and line vacuum control solenoid valve (EGRC), an EGR temperature sensor, and a back pressure sensor (VRT) valve. The PCM controls the operation of the system through the EGRC solenoid valve. There is a special valve in the air intake tract located directly behind the throttle valve. The intake port vacuum is monitored through a valve located in the throttle body. When accelerating, the throttle valve opens, which increases the vacuum in the intake manifold.
2. The VRT switch valve monitors the depth of the outlet back pressure as the engine speed changes. The information from the EGR temperature sensor is used by the PCM to control the EGR flow by turning the system on / off.

1. Check all hoses for cracks, kinks and other mechanical damage. Assess the tightness of the union connections.

2. To check the correct functioning of the EGR system, warm up the engine to normal operating temperature. Place the transmission in neutral, apply the parking brake and support the rear wheels of the vehicle with wheel chocks. Leave the engine idling.Opening the throttle valve, raise the engine speed to 2000 ÷ 4000 rpm, then close the throttle again - the EGR valve stem should move when the speed changes. Repeat the check several times. If the stem does not move. Check the vacuum signal supply to the EGR valve. Disconnect the hose from the valve and, pressing your finger to its cut, repeat the procedure. If there is no vacuum in the hose, check the tightness of the corresponding unions, then go on to check the EGRC solenoid valve.

EGR control solenoid valve (EGRC)

1. Check serviceability of supply to the vacuum valve with the engine running. If there is no vacuum, check the condition of the corresponding vacuum hoses and their unions. If the hoses are OK, check the permeability of the nipple on the throttle body. If the vacuum is supplied correctly, disconnect the electrical wiring from the EGRC valve and check the serviceability of the battery voltage supply to the contact terminals of the battery connector with the ignition on (do not start the engine).

2. To check the correct functioning of the EGRС solenoid valve, disconnect the electrical wiring from it and, having grounded one terminal, use a jumper wire to connect the other to the positive pole of the battery.
3. When power is applied, the air must be freely blown through the two fittings located next to each other. The valve must close when power is removed.

EGR backpressure switch valve (VRT)

Before the trip to Anapa, the O-rings in the glushak burned out, I did not manage to fix it before the trip.

On the road, the whistle became stronger and stronger, the power dropped with every hundred kilomentors, fuel consumption grew!

Over the weekend, when washing the engine, a torn modulator of the EGR system was found to shreds, I decided that because of this, a troublesome with walking speed arose. Yesterday we got our hands on the car. I went to our service. All day trying to put in the muffler O-rings and get them to seal the system. But they still let the gases through.

Towards evening, they discovered that the sound comes not only from the muffler, but also from the back of the engine. Inspection showed that gases are escaping from the EGR valve tube under enormous pressure. The valve was forcibly shut off. He began to whip the muffler again and the engine speed stopped rising above 2500.

Then everything was more interesting.

Gena: Valer, why the hell are you giving me rosin with a muffler and a malfunction of the EGR system, if your catalytic converter finally died and because of this all the problems, high pressure in the exhaust system?

They threw off the glushak in front of the katalik, the engine started working like a watch, but the current is ooooooochen loud. It was decided to break through the catalyst. Crowbar and sledgehammer, Russian folk instruments!

It works like a watch, the glushak does not cut, EGR without problems! And also the engine had a drain of power that already the rubber whistles (well, this is out of habit, for the first half hour I pressed the trigger just like before the repair)! In general, the buzz! I did not think that the wheelchair could be so clogged that all the gases go anywhere, but not into the muffler!

So, a few words about the "EGR" (Exhaust Gas Recirculation) system, which means "exhaust gas recirculation". From the name itself, it becomes clear that the principle of operation of this system is based on the return of a certain amount of exhaust gases back to the engine cylinders for final combustion.

Dealing with a malfunction that occurs due to improper or unstable operation of the "EGR" system is quite difficult, especially for a novice auto repairman. This is probably due to the fact that everyone is accustomed to the so-called "usual" malfunctions: "engine troit", "engine will not start", "engine" shakes "" and so on.A malfunction of the EGR system does not apply to "ordinary" malfunctions (if they can be called that), because it is disguised either under the same "missing", or "abnormal air leakage", or under something completely incomprehensible.

For example, the engine starts and the first time it works absolutely normally, but 10-15 minutes pass (and in some case - an hour or two hours of work) and some strange, not quite explainable interruptions begin - the engine is just “troit” , then - either "coughs", then - or something else. “By ear” it is rather difficult to determine such a malfunction. In addition, not every master and not every workshop has special devices recommended by the manufacturer to test this system.

So the EGR system is not the “last link” to look out for.

The principle of operation of the system is based on the return of a strictly defined amount of exhaust gases back to the intake manifold at a strictly defined time. Further, mixing with air and fuel, exhaust gases flow back into the engine cylinders along with a fresh air-fuel mixture. This amount is determined by the control unit (ECU) according to the program laid down at the factory based on the readings of the sensors: Coolant temperature sensor (THW); Absolute pressure sensor (MAP-sensor) or air mass sensor (MAF-sensor); Throttle position sensor (TPS); Intake manifold air temperature sensor (THA - not on all models). Own EGR sensors.

The number and purpose of sensors may vary depending on the car model, year of manufacture and country of destination, that is, for which country this car was produced.

The above is not a dogma, because different versions of the "EGR" system are possible. If on some cars the “EGR” system is controlled, for example, by a computer based on the readings of the coolant temperature sensor, some other sensors or sensors, then on others the whole system is controlled by one solenoid valve and the intake manifold vacuum (this is the so-called classical system).

It should be noted that the "EGR" system does not work constantly, but according to a special program (if the bypass was carried out constantly, you can imagine what ratio of air and gasoline would enter the cylinders, not 14.7: 1, but it is not clear what).

When the engine is started, the computer (ECM) is guided by the readings of the coolant temperature (THW) sensor and, if the engine is still cold, does not give a command to add exhaust gases to the engine cylinders. When the temperature of the idling engine reaches 60-80 ° C, the computer sends a signal to open the solenoid valve. The valve opens and, accordingly, the vacuum of the vacuum port "A" occurs directly in the "EGR" valve, but the vacuum force in the vacuum port "A" at this moment is not enough to OPEN the "EGR" valve. For further operation of the “EGR” system, additional “force” of the vacuum port “E” is required. This port serves to help the EGR valve open at the right time. At approximately 900 - 1100 rpm engine speed, an ADDITIONAL vacuum is created in the “E” vacuum port, which, together with the vacuum from the “A” vacuum port, helps the EGR valve to open.

If the engine speed exceeds 4000 rpm, the computer commands the EGR solenoid valve to “close” and cut off the flow of exhaust gases into the engine cylinders. That's it, the “EGR” system does not work again.

Thus, we have established in which cases the EGR system works and in which it does not. Let's repeat: when starting the engine from a cold state and warming up to a temperature of 40-60 ° C, the EGR system DOES NOT WORK.

On a warm engine, at idle speed, the EGR system DOES NOT WORK.

Starting from 900 - 1200 rpm, the EGR system RUNS and continues to work until the engine speed reaches 4000 rpm.

What are the advantages of this system?

The positive thing is that when the EGR system is turned on, a certain fuel economy occurs - at the moment the EGR system is turned on, the computer connects the fuel mixture depletion program, which is executed and controlled mainly using an oxygen sensor.

The above circuit is one of the simplest circuits for the EGR system, using only two components: the EGR valve and the EGR solenoid valve. This is a classic scheme, on the basis of which such EGR system schemes are now built, which may include some additional elements. For instance:

EGR valve position sensor

EGR vacuum switching valve

But if we consider in detail the structure and operation of all types of EGR systems on Japanese cars, then it will take more than one hundred pages.

What is affected by the malfunctioning of the system?

First of all, improper operation of the EGR system affects the stable operation of the engine at idle. This is because the readings of the air flow sensor (MAF-sensor) or the absolute pressure sensor (MAP-sensor) are negatively influenced by the unaccounted amount of exhaust gases. If it is not enough, then the control unit (ECU) still somehow, probably, will be able to adjust the idle speed based on the readings of the oxygen sensor. But if the volume of gases passing through the valve is quite high, then the control unit will no longer cope with this.

An example is the case of a NISSAN repair with a CA-18 engine. This car came to us from time to time, i.e. with a "floating" fault. And looking for such faults is both difficult and, in some cases, hopeless. It took a lot of effort to find the cause of the malfunction. However, at some point we “hit a dead end”. Well, judge for yourself: everything seems to be checked and rechecked and everything works fine and correctly. The car starts up perfectly, works perfectly - quietly, smoothly, “like a watch”. However, fifteen minutes pass and ... the engine starts to malfunction. This failure lasts a few minutes, and then everything returns to normal and again the engine works amazingly. And like this, within an hour - several times.

By means of simple checks, we have calculated that the picture of normal engine operation is “lubricated” by the first cylinder. We began to look closely at what was “tied” to him. So we went to the port of the EGR system, through which the exhaust gases through the EGR valve freely passed into the intake manifold and there, due to certain physical laws for a specific intake manifold, they "failed" precisely in the first cylinder. In addition, improper operation of the “EGR” system can affect the operation of the engine in both acceleration mode (the car jerks) and deceleration mode (pops in the muffler when gas is released).

On "simple" cars, it is advisable to simply plug the vacuum port of the EGR system. This will not do much harm, the engine will work stably and reliably. If the EGR system is “advanced”, has many sensors and actuators, then when installing a plug on the channel of the “EGR” system, the machine will, of course, work better at first. However, later it may develop such a defect: the engine at idle speed will spontaneously "go out" at 1500-2000 rpm, and after a while it will also spontaneously reduce them to normal ...

However, on vehicles after 1995, installing the EGR blanking plug will cause the “CHECK” light on the instrument panel to come on.

Sometimes it turns out to clean the EGR valve itself (its stem and seat) by using a "WD-40" type cleaner.

It was for the purpose of establishing a change in fuel consumption (or unchanged) immediately after jamming, gasoline was poured under the neck of the tank.... ... Although even if the flow rate increases (within reasonable limits, naturally), since it was before the jamming (dullness, dips during acceleration, and twitching, such as a slight podtruvaniya engine idling) I do not want to be exact anymore. ... ...

But if the expense is large, then I don’t know what to do then. ... ... Should I put a new one?

Recently I drowned out this device. the machine began to dull terribly. after the plug found boooolshoy fuel consumption. (I drove 180 km through the city for 25 liters). I tried to clean it, cleaned it up, put it on, the machine immediately started heating up again, dulling it. I do not get it. Or should I buy a new one? ... Or maybe something is wrong with the recirculation system itself? ...
How does the valve generally work, at what speed does it open? ...

Threat I also did this, poured water into the upper part of the valve (naturally the valve was removed), the valve was in the closed position, and the water was all glass down. then it does not hold. those. Should it be generally hermetically sealed or should it still allow a little leak? ... and why not?

A question about turning on the radiator fan. Now in the morning it is quite cool + 6g, returning from work in the early morning and hearing how the ventilator turned on and measuring the temperature at +66g, when the fan turned on again when driving up to his parking lot, but already at + 78g. When the fan turns on during the daytime, then it is 86-90gr.
The measurement was made with a special laser thermoscope, the interior heating was turned off,
But in the daytime, the fan is turned on exactly at 86-90g
Tell me if the fan operates in such a temperature range - is this the norm?

And further
however, even if the car is warmed up to operating temperature, and while driving into the cold, the lower pipe and the bottom of the radiator also cool down, it turns out that this is not good for the engine because it does not reach operating temperature while driving. Maybe I'm wrong, of course.

Could Thermostat be to blame?
The car in the city warms up well as always Upper. and the Bottom pipe is hot, the temperature arrow is in the middle

In general, I would be grateful for any help.