The machine does not drop the speed at idle. Low idle speed on a heated engine: causes and methods of solving a malfunction. Problems on the injector

The high speed of the engine at idle, except for completely unnecessary fuel reproduction, also interfere with driving cars - let's say, when driving a particularly broken section of the road, when you want to gently "sneak" among the selected on the first gear, and the car boldly takes the suspension strikes. In addition, with long downtime in traffic jams, the motor will work all the time in elevated temperature mode.
Consider several reasons why the increased speed of idling on a heated engine is not falling. The reasons may be faulty in both the mechanical and in the electronic components of the engine power system, so we describe the possible breakdown options separately. But since in the car these components interact in the complex, then you may be able to independently find the answer to the question why your engine has large idle speeds by taking the material of this article as "information for reflection".

Checking the intake manifold for tightness

The redundancy of excess air may cause high idle speed. Moreover, depending on the place of penetration of excess air in the intake manifold, idling turns either will be simply elevated, or will begin to "swim".

If idling "float", then most likely takes place.

If there is simply disruption of the tightness of the intake manifold gaskets, damage to vacuum hoses or sealing rings, the turnover will "swim". This is due to the fact that the amount of gasoline supplied to the cylinders will be permanent, and the quality of the mixture becomes the "richer", then "poorer". When a certain critical value (air content in the fuel mixture), the motor will start slowing down - up to the stop. But with a decrease in the number of revolutions, the amount of air entering the collector will decrease, i.e. the mixture will encine and the engine "comes will be limited" - idling turns will increase. So it will continue until not eliminate the tightness of the intake manifold.
On turbocharged engines, air drums can also be performed through damage in the intercooler or connection of air nozzles. With a significant subsoil (for example, if screwed off the nozzle from the intercoule), the engine begins to work with a whistling (or hissing) sound. But sometimes it is possible to identify the place of impairment of the intake path, overlapping the air supply to the intake manifold in different places in turn - from the air filter to the collector itself.

Supply of excess fuel

Cleaning throttle valve

A completely different situation will turn out if not just an excess air, and the fuel and air mixture - for example, through a slot formed as a result of a loose closure of the throttle. In this case, highly idle engine turnover will be stable.
In the fuel systems of some engines there is a semi-automatic regulation of fuel supply in the engine warming mode - due to its large idle speeds are maintained until the motor is warmed to a given temperature. Fuel is served on the channel, "bye" throttle.
Such a channel can close / open in various ways - the valve in it has either an electric drive (solenoid), or it can be arranged like a refrigerator thermaller - when the engine warms up, the channel is locked.

With high idling, it is necessary to check the entire throttle node with sensors and the XX regulator.

In any case, such a valve may break, and then in the intake manifold will always come with excess fuel, which will be the cause of larger idle speed after the engine warms up.
In all such cases, first of all, it is necessary to remove the body of the throttle valve and rinse with it with a special solution - a lot of things are sold in stores of such "chemistry". After washing, you need to thoroughly inspect the node - especially for the subject of hot or, on the contrary, excessive throttle of the throttle valve.
The throttle valves of some injection engines have, in addition, the screw for adjusting the idling of the engine or restrictions on the closing of the damper - you should pay attention to them, - is the adjustment node.
Often the engine speeds are not falling at idle due to the hot gas cable or falling under the pedal of foreign objects - the corner of the rug, for example.
Of course, almost all of the above can relate to carburetor motors. In addition, a characteristic malfunction (or, more precisely, deviation from the norm) for them is the incomplete opening of the air damper - mainly due to improper installation of the "Suppress" cable. In the absence of a breakdown, normal speeds at idle the carburetor engine are installed by adjustment using two screws - "quantity" and "quality" of the mixture.

Files of electronics

Checking the engine idle regulator

After replacing the idling regulator, it must be "prescribed" i.e. Apply its parameters in memory of the ECU.

The idling regulator (RXX) is a stepper motor (solenoid), operating from pulse signals supplied. It works in a similar manner with a screw adjustment screw of the mixture in the carburetor - when extending the valve it overlaps the fuel channel when it opens it.
It often happens that the core of the regulator simply encourages, and it ceases to respond to the signals of the ECU. And it is possible to damage the idling regulator yet in the store when buying - trying to turn or press the valve to the needle.
If, after replacing the sensor (regulator) of idling, there are high speeds, then, most likely, the case or in the ECU or in the mass flow sensor - all components of the power system elements are operated in the interaction, and must be diagnosed. It is quite possible that a new regulator will have to "prescribe" - that is, to enter the message to the computer.

temperature sensor

This sensor can also affect the engine fuel system. Having groaning an invalid signal (appropriately reduced) on the ECU, it will cause the controller to give a signal to other elements of the fuel system (nozzles incl.) On the enrichment of the mixture. The incorrectness of the sensor signal will lead to the fact that at idle turns will be more than 1000 min-1.

Air Flow Sensor

The DMRV directly affects the quality and the amount of mixture supplied to the cylinders - because the ECU "knows" about its composition thanks to this (and some other) sensors.
In conclusion, if the engine of your car was unfortunately climbing idling, look first in the possible hotels of the fuel system mechanisms - after all, it is primarily subject to different contaminants, and for electronic nodes, a voltage or closure is much more dangerous.

It is very important that the engine work correctly in any mode, including at idle. However, many car owners face a problem: when the engine is discharged, the engine turnover is not reset. As soon as this defect is detected, it is necessary to immediately find out the reason and eliminate the malfunction for the uninterrupted operation of the car. Also, the engine can reset the turnover for a long time, which also does not contribute to the right job.

Usually upon reaching the operating temperature, turns should fall to its norm. Indicators for each specific vehicle model Manufacturer indicates the manual. They can change slightly depending on the mileage and the overall condition of the car, but usually hold up 650-1000 revolutions.

In some cases, turns are very slowly discharged or at all hold on at the same level in 1500-2000 revolutions. In this mode, not only the fuel consumption increases, which affects the driver's finances, but also contributes to the wear of the engine.

The cause of work failure in idle mode must be diagnosed using qualified masters. However, to independently understand why the engine turns do not fall.

Carburetor System Problems

When the gas is discharged, the drop in revolutions can pass badly both on the injectors and on the carburetor systems.

If the car is a carburetor, then there may be several defects.

Most often, turns are not reset due to the faulty throttle. When the engine warms up, it is in the open position so that more air falls into the system. Then it closes and turns should fall.

Not closed to the end, the throttle valve leads to the fact that when the operating temperature is still being reached, the re-entered mixture is still fed, and the revolutions remain at the same level. If this item is strongly contaminated or deformed, it cannot be completely closed.

You can clean the damper using a special tool, which can be purchased at the automotive goods store. The deformation may require the replacement of the carburetor completely. The valve can be loosened loosely, if the drive cable is strongly worn. His replacement can correct the situation.

Another common reason, due to which the engine speed does not fall in idle mode, becomes a laying between the carburetor and the head of the cylinder block, which has become unusable, or the damaged intake manifold.

After replacing the carburetor or cleaning the power system, it is often possible to notice that the engine turns slowly. This is due to improper adjustment of the idle system, the re-entered air-fuel mixture is often fed. To eliminate a malfunction, it is necessary to adjust the supply ratio into the fuel and air system.

Also provoke a work defect can high fuel in the carburetor float chamber. The needle valve is responsible for it. Checking this detail can correct the situation.

Injector system

If an injection system is installed on the car, the causes of high speed at idle can be significantly larger. Here, both mechanical elements and electronic devices that are responsible for adjusting the XX can fail.

The main malfunctions of the injector include:

1. Incorrect operation of the temperature sensor installed in the cooling system. Incorrectly obtained data from this instrument makes the electronics to recognize the engine as cold and work for warming up, due to which high revs required for a set of operating temperature are supported. Often, overheating may occur, which leads to more serious breakdowns, up to the overhaul of the engine. The same effect is possible with incorrect operation of the idle mode regulator.
2. The cable regulating the work of the throttle can ignite. The more car mileage, the higher the risk to face a similar problem.
3. The electronic XX operation sensor often comes into a malfunction, then turnover will be or grow or will disappear.
4. The spring, leading the throttle to the original closed position, incorrectly functions, scores or is very stretched.
5. To the combustion chamber of fuel, there is too much air due to poor-quality or past gaskets. It is necessary to carefully check the collector seals and nozzles.
6. And the most simple reason is usually the wrong arrangement of the rug after a visit to the car wash or dry cleaning of the cabin. It is often inactively placed under the accelerator pedal, which leads to the visibility of the engine improper operation.

If the car is oversaturated with a variety of electronics and all work is built on the proper functioning of the sensors, one of them may well become a problem. It will serve incorrect data on a computer, as a result, turns will not fall. Self detect the problem, most likely, will not succeed.

It is necessary to contact the car service for computer diagnostics. The best task will be cope with specialists working on a service that specializes in the repair of a specific car brand. If the diagnosis is carried out on time, it is possible to get rid of a simple sensor replacement.

It is not worth tightening with repair, because the oversaturated mixture does not affect the operation of the engine and significantly reduces its life.

Floating revs

In addition to slowly falling revolutions, car enthusiasts can push into such a phenomenon as floating momentum when they fall, and then increase sharply. The reason becomes an excessive supply of air into the system, which causes the engine to spin turns up to 2 thousand at idle.

This often occurs in cars having a fuel injection sensor. It calculates how much air is needed. When his work is broken, at different times a different amount of oxygen is supplied, as a result, rumble jumps are observed approximately every 3 seconds.

Faced with a similar phenomenon, a prerequisite will be all the same computer diagnostics. It is very important that her and all subsequent work carried out experienced, qualified specialists. Turning to a service that does not specialize in breakdowns of this kind can face the need to carry out an expensive engine overhaul before time.

Often drivers are interested in why engine speeds do not fall at idle. This situation is quite often occurring, and no carburetor engines or more modern injectors are not insured. True, the causes of malfunction will be different. But, in practice, everything can be diagnosed on their own, as well as almost on all models of cars, the problem is eliminated with their own hands without any particular difficulties. Here the most important thing is to correctly diagnose, it will significantly speed up the repair process, and will save you from additional problems and difficulties.

What it is?

Why don't the engine speed fall at idle? For a start, let's decide how to understand that the problem arose, and also let's see what it can lead to. To determine the increase in speed at idle can even inexperienced car enthusiast. It is easily felt by rumor. With increasing revolutions, there is an increase in the noise of the operating engine when the gas pedal is released. Also on the machines equipped with a tachometer, you can trace the increase in the revolutions. Almost on all models of passenger cars, idle turns fluctuate within 650-950 revolutions per minute (Specify the indicator in those. your passport of your car), all that is considered to be a deviation from the norm. Also on many injectors such a problem causes the inclusion of "Check" on the panel.

Carburetrators

To begin with, we will deal with the problem on carburetor engines. This type of food is considered obsolete, but still many cars on the roads are accurately so. Also, many motorists in their ideological reasons use such motors, and are not going to refuse them. Diagnose the source of the problem here is quite difficult, and this is taking into account the small list of elements that cause an increase in revolutions. Let's look at what should be paid to:

• Loading needle valve. In this case, the fuel enters the chamber is not dosed. Moreover, depending on the location in which the valve jammed, idle turns can both disappear and vice versa increase;
• Violation of adjustment idling systems. It usually occurs after cleaning or repairing the carburetor. To avoid problems, you should correctly set the ratio of fuel and air. If you have not previously done, it is better to read how it is done on your version;
• The problem is closed. There may be several reasons for such a malfunction. Most often, the damper is not closed due to the presence of Nagar on it. In this case, you will need to clean this node. Usually, it helps. In some cases, the throttle may be damaged. Then it will be necessary to change this item, but this possibility is not provided on all carburetors;
• Sometimes, the problem may manifest itself when it happens quite rarely. But, nevertheless, it is better to check. For this, on the engine running engine, open the radiator cover, with a running gasket from the neck, the white smoke will go out. In this case, it will be necessary to change the gasket;
• Open Soots. Check how the valve works in the primary chamber. If they revealed the problem, then it makes sense to see how the sacrifice works. Most often, to eliminate the problem, it is enough to simply lubricate the cable and the damper drive.

Injector

On engines that are equipped with injectors, possible reasons for increased revolutions. In particular, the problem may be caused by both mechanical faults and the refusal of electronic sensors. But, unlike simpler carburetors, simplifies the presence of an on-board computer, which is capable of reading errors. So, consider the reasons for increasing revolutions on the injectors:

• Failure When breakdown of this sensor, the power unit begins to work nonstopable in warm-up mode, that is, the revs are not reset. The control unit believes that the optimal operating temperature has not yet been reached, and tries to heat the unit. Such a malfunction is fraught with overheating of the engine and expensive repairs. The easiest way to identify this problem using computer diagnostics;
• Violation of work. Sometimes, the reason in the mass flow sensor. Again, they are diagnosed, after which suspicious sensors are checking the multimeter. Additional check is required to eliminate the wiring break. If necessary, faulty sensors change;
• A throttle cable may occur. Check it with its performance. When the malfunction is detected, it is recommended to try to lubricate the cable, and develop it. If it does not help, you have to replace the part completely;
• Jumped, or the return spring of the flap was too stretched. This problem is also characteristic of old cars. Put the spring in place. If she stretched, it will be needed to buy an injection repair kit;
• . In this case, it serves an engine control signal of an open valve, in turn "brains" of the car provide more revolutions than in fact. The reason for the breakdown may be in a simple piece of part, or resistance brave. In the latter case, only a variant with a sensor replacement is possible;
• The last reason to be checked is the integrity sealing gaskets injectors. The check will require enough serious interference in the injector, therefore, they check this cause last, although this phenomenon is not the rare. In case of damage to the gaskets in the combustion chamber, there is an excess air, which causes an increase in engine speed.

Conclusion. Problems with the operation of the power system at least once met each motorist. Therefore, such a question is why the engine speed does not fall at idle, is not amazing. Unfortunately, it is almost impossible to answer it uniquely. There are quite a few reasons for such behavior of the car. To reveal and eliminate breakdown, you will have to carry out a detailed diagnosis.

Eleaches with the owners of the front-wheel drive vases are enough for the entire operation time of the machine. One of the most rapid - high idling speed, and, on the already heated car. This problem usually causes annoyance, since the reasons for its occurrence is too much, and the search for them is not easy.

We list them.

1. The most basic - malfunction or failure of the air consumption sensor.
2. No less often a breakdown of an idling valve.
3. The crankshaft position sensor, which issues incorrect information of the control unit, can also become a root of high or floating idle speed.
4. Another throttle position sensor can be facing.
5. It happens that for any reason it is not returned to the gas pedal back to the end. Moreover, this is happening as due to a banal violation of the operation of the cable, so because of the very funny - for example, after washing the car, the driver's rug was so stuck that the tip of the rug began to touch the pedal.
6. The air filter is very clogged. Because of this, a mixture for combustion is obtained too enriched with gasoline, again there are high revs during idling.
7. Fleamed cable with throttle valve.
8. Malfunction of the engine temperature sensor. It gives the "brain" of the car the wrong meanings, they increase the speed of the crankshaft, thinking that the engine is cold.

As you can see, we have a whole forest of a variety of reasons why high revs appear! We further consider the most characteristic, plus the most common problems associated with the described problem. At the same time we'll figure it out how to eliminate them with your own hands.

Ways to eliminate "sores"

If such a trouble happened, to look for which node is to blame, you need analytically, checking all the indicated sensors.

To begin with, consider the following version of the correction of the problem situation. Suppose there were high revs from the VAZ 2110. Inspection of suspects for faults of nodes showed that the throttle position sensor has traces of rust. It is located directly above the throttle. The voltmeter measurements have shown that during operation of the motor, the voltage on it remains high - it means that it does not close the flap.

How to eliminate a malfunction? To do this, we will need only a screwdriver. We proceed to implement the procedure.

1. Disconnecting the terminal block, as well as unscrewing two screws, dismantle the node.
2. We notice that traces of rust inside interfere with the wheel of a wheel regulating the position of the flap.
3. Fulfing the insides of the defective device penetrating aerosol against rust.
4. Screw a screwdriver for development.
5. Build the assembly in the reverse order.

Checking whether the engine is highly high. The problem must eliminate.

Now we will analyze a different case. Let's say, we have overestimated speed at idle at VAZ 2114. That's what we do, facing this situation.

When finding out the circumstances of the study, the problem is inspected initially always the operation of the idle sensor. This device consists of a needle embedded inside the electromagnetic coil. The needle either moves inside the coil, moving away from the throttle hole, or put forward, closing this hole, thereby stopping the air supply for the combustion of the mixture.

Also read about and.

This element is located at the throttle damper, opposite the gas pedal cable. To diagnose it, we pull out a terminal block from it, we bring the car, after which we see that we still have high engine speeds have not changed at idle. Then remove this defective node, then make it cleaning or replacement. To work, take:

• screwdriver;
• toothbrush;
• petrol.

Begin.

1. We unscrew the two screws. Give a broken node.
2. Connect the wiring to it. Turn on the ignition. If the needle of the device to the touch slightly pulled into the coil, then it is working.
3. If the needle does not react when the electric current is supplied, wash the device with a toothbrush with gasoline.
4. Assembly make in the reverse order.

When it is not possible to restore the performance of this node with your own hands, it is better to purchase a new one. Moreover, the cost of spare parts is small.

Other ways to fix

Of course, the options considered options are not exhausted possible ways to correct the disadvantage when high revs are seen on a warm engine. For further study of the most common situations, we will analyze the case with a malfunction of the air consumption sensor.


This device is responsible for feeding the correct air portions for the combustion of the mixture, and also gives these data to the electronic control unit on these portions so that the unit commensurate the supplied portions of the gasoline.

The diagnosis of this node can be made as follows. It is necessary to turn off the terminal block from our mass flow regulator, and then start the engine, after which it is necessary to drive on the crankshaft revolutions above 2000 rpm.

This automatically starts the emergency mode, the portions of the mixture are now calculated only by the position of the flap. If the sensations have shown that the car with a disconnected sensor has become more dynamic than with connected, then the malfunction of this node is obvious.

To replace it, take the following tools:

• screwdriver cross;
• screwdriver flat.

We start repair.

1. Loading the motor, we turn off the wires from the mass flow sensor.
2. Weave the clamp, remove the hose on the inlet tube.
3. We dismantle a defective device, unscrewing two bolts.
4. We produce a replacement of the device.
5. Build the assembly, moving on the points ago.

This is how this reason for high revs are eliminated.

For some reason did not help

Now we will analyze such a situation. The car owner changed, for example, a idling sensor, while the crankshaft was high, or still remained elevated.

The reasons for such an unpleasant phenomenon may be as follows.

1. Most likely, the motorist did a replacement just like that, Naobum, may cease to turn too quickly. The real state of things suggests that the fault must be sought elsewhere.
2. If this is a sensor is not a completely new sample, it has an adjusting bolt, you may need to twist it to configure the problem node. Modern idling valves when installing them do not need any additional configuration. However, for example, if the priors have high speed at idle, then this car can search the adjusting screw.
3. It is possible that the new spare part was defective.
4. Incorrectly installed a new spare part.

Here, perhaps, all the roots of the phenomenon are listed.

Talk about the cost

Not all under the power of this type of repair, as even reinstalling some sensor. Although the main difficulties cause not so much the substitution of one of the sensors involved in the process, but it is precisely the diagnosis of the origins of the field of rotation of the crankshaft when working in the work. After all, we found out that the search for the causes of this disease is complicated by their diversity.

If the motorist decides to turn to the masters a hundred, with a request to find the cause of the high speed of the engine produced at idle, the cost of diagnosis on major cities of the Russian Federation will be such.

Since the price of manipulation is low, then if the car owner doubts the success of his own diagnosis, he can safely contact the service station.

In the course of the article, we reviewed the basic solutions to a common problem. Now, if the car enthusiast faces the manifestation of the overestimated speed of the crankshaft of the crankshaft, he will already know how to do.

Now read about and.

Many injector car owners could observe the effects when idling (xx) suddenly fall momentum. Especially often this phenomenon occurs when the motor is warmed to operating temperatures. Sometimes the turns fall so low that the motor stalls. Let's figure it out that it can provoke low idling turns on a warm engine, and also learn why they fall. This information will be useful to everyone.

The origins of the unstable engine work on the XX

How will the picture be folded if the control unit does not receive data on the number and amount of air consumed? So, for example, the throttle sensor reaction will be the following - the frequency of revolutions will initiate, but then the fuel mixture will begin to be poor, as a result of which low speeds are installed on the hot engine. The reason for this one - the amount of air consumed by the motor has decreased.

However, it happens on the contrary - the fuel mixture is enriched, and the engine begins to gain momentum again. Such cycles can be alternate infinitely, these are floating momentum. Especially relevant the problem of low idling turns on a warm engine in winter.

On some cars, events can develop and differently - the turns grow, for example, up to 2000 rpm, and so remain. The reason is that the injector injected elevated portions of fuel. The amount of air does not grow, otherwise the engine could raise the turnover and up to 3 thousand, however, then it would still be stupid.

Fuel quality

When idling speeds are falling on a warm engine, you should not remove the fuel. It is possible that the problem is not connected with electronics, sensors or executive mechanisms. Maybe the thing is that the driver fills more low-octane gasoline, and the ECU is calculated on high-octane brands. Hence the depleted mixture, so the control unit remains nothing, how to work like this.

Possible reasons

So, because of what does this problem arise? Some of the most vulnerable links in injection engines are sensors. One of the elements that directly affects the operation of the engine and its quality is an idle sensor. Often find it is possible near the throttle. This is a stepper electric motor with a conical stop-up needle. When the choke is closed, the air falls around the damper along the idle channel, which overlaps the needle.

Another culprit that very low idle speed is air - the second important component for the preparation of the fuel mixture after gasoline. Therefore, if the mixture is quite poor, it is still a big turnover.

When failures arise in the system, the ECU cannot correctly choose and calculate the proportions of the fuel mixture in XX mode. As a result, the engine work will be unstable, the turnover will begin to fall and climb.

The less common problem of low idle speed on a warm engine can be incorrect operation of the EGR system, or rather its valve. The element is installed in the intake manifold and its function - the output of exhaust gases. This is nothing more than a periodically sensor must be cleaned.

It will not be superfluous to make sure that there is no air supply in the system and check in what condition is the throttle. Often the problem of low revolutions can be associated with a dirty damper or mechanical damage, deformations. It often happens that for one reason or another, the flap jars - hence another cause of low revolutions.

Why die sensors?

Experts identify two reasons for low idle speed. One of them is associated with low fuel quality. Often the low octane number is not only very much pollutes the working surface of the sensor, but it may also cause various disorders in the operation of electronic blocks.

In addition, often the sensors fail because of a banal marriage or exceeding the work resource. Inexpensive sensors may well be low-quality or defective. That is why low idling speed appear on a car.

How to exclude air seats?

In order to exclude or confirm the sublicas into the system of excess unaccounted air, check the tightness of the air supply system.

To do this, you can remove the air pipe and pour into it from the compressor or pump. The hose can be placed in water. So it turns out to identify cracks and other defects.

How to check the idle sensor?

To check the performance of the sensor, it is recommended to use a multimeter. The verification procedure is very simple. Replace resistance between contacts in the sensor block. It is important that the ignition is included. Resistance between different vapor contacts should be from 39.5 to 81 ohms. If during measurements the multimeter issues other readings, then the sensor should be replaced.

Checking DMRV

So, first for checking include ignition. Multimeter need to check the tension. Measure it between contacts with green and yellow wire. On various cars, the voltage can vary from 0.9 to 1.2 V. You can determine the output of the mass flow sensor of the air and in the appearance of the candles - the Black Coal Nagar says that it is better to replace it.

How to Clean the idle regulator (RXX)?

When there is a problem of low idling speed on a heated engine, in some cases it can be washed with flushing dhh. To do this de-energize the car. The controller is located on the throttle node below the DPDP (throttle position sensor). It is necessary to prepare a clean rag, a screwdriver, a liquid in the aerosol can be prepared - it can be any means for cleaning carburetors or injectors.

Cleaning begins with dismantling - to remove it is enough to unscrew the fastening screws. Sometimes there are bolts. After the sensor managed to remove from its landing place, you can start the cleaning process. The work is carried out with the help of a vein treated with a liquid from the canister.

It is also necessary to sprinkle from the sprinkler on the needle. The latter on various models of the car can be both metal and plastic. The cleaner will not spoil plastic. But the liquid should not get under the spring. If it still happened, it is recommended to blow the sensor with compressed air as quickly as possible. If this is not done, the liquid will wash the inner lubricant, which will cause the full yield of PCH in order.

Conclusion

As can be seen, only a few sensors can provoke low engine speeds at idle. But even one small element can significantly spoil the life of the car owner, especially if the turnover is not always falling. But this is not a problem, because this question can be solved easily, without large capital investments.