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.

In any case, the problem should be tried to eliminate in the shortest possible time. Increased revs - the reason for increasing the consigning fuel. This increases the cost of refueling. Also, the increase in revolutions is significantly accelerating the engine wear. So it is not desirable to delay with the solution of this problem. So you will significantly save your money. When identifying and eliminating the cause of high revolutions, it should be remembered that the problem can be called different faults on carburetners and injectors.

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.

In addition, gas pedal jamming can be found. This situation can happen not only on carburetors, but also on the injectors. Be sure to check whether the pedal goes freely.

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.

In addition to the listed, always follow the location of the carpet in the car, sometimes it falls under the pedal, and does not allow it to work optimally.

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.

It is necessary that all power unitsystem systems work properly. In this case, the engine must work normally both under load and in idle mode.

In practice, often the drivers face a problem when the engine turnover is not falling or falling with a large delay after discharge gas. It is quite obvious that overestimated idle turns point to malfunctions and are the cause of increased fuel consumption.

In this article we will talk about why motor turns do not fall, as well as consider the main reasons why similar problems arise on and auto.

Read in this article

When resetting the gas, turns are increased or "hang": common malfunctions

Let's start with the fact that on many cars with an injector during heating the turns raises. This is necessary in order for the power unit to work steadily after a cold start.

However, after increasing the temperature, the control unit lowers the turnover of XX, bringing them to normal. On many cars with a carburetor, the driver independently increases the revolutions during heating, using the so-called "SUPPLC".

At the same time, after the engine is heated, the idle speed is normal, on average, 650-950 rpm. If you click on the gas and release the accelerator, the turns should be increased, after which it is again dropped to the specified values.

It also often occurs when the momentum is slowly reset or constantly held at a mark of 1.5 thousand rpm, 2 thousand revolutions, etc. Expensely, in such cases, the flow rate is increasing and is stronger than the DVS, which indicates the need for diagnostics.

• So, let's start with frequent carburetor problems. Often the engine speed is not discharged due to the problem with the throttle. For example, when the driver presses the gas, the damper must be opened wider so that more air to burn the fuel in the cylinders. After the gas pedal is released, the damper is closed, revolutions are reduced.

If the damper does not close to the end, the re-entered mixture is incorporated into the cylinders, revolutions are increased. The reason may be strong pollution of the throttle node or damage to the damper itself (deformation). To begin with, clean the flap, the liquid for cleaning the carburetor is suitable as a cleaner.

We also note that the damper is closed and in the case when the drive cable is worn. In this case, the cable is subject to replacement. On carburetor machines do not fall engine speeds often and in the event that the gasket between the carburetor and failed. Also, the culprit may be an intake manifold, which has damage.

The main task becomes the right ratio of the amount of fuel and air. Often the high level of fuel in the carburetor float chamber also leads to increased revs. Check should be started with a needle valve.

• We now turn to the injector. Pay attention to many injection cars. As for malfunctions, the injection system itself is more difficult, that is, the causes of high revolutions are more compared to the carburetor.

As a rule, circulation problems can be caused by malfunctions of both mechanical elements and electronic components. In the list of major malfunctions, experts identify disorders of the temperature sensor, which is installed in.

Similar words, if the specified sensor supplies an incorrect signal, the ECU believes that the engine is cold and uses the warm-up mode. In this case, the control unit raises the momentum so that the power unit worked stably and faster to operate.

Also, revolutions problems may begin due to problems and failures in the work (idle regulator). It also happens that the throttle cable is hired and twisted. Another spring that closes the throttle can stretch or cause damaged.

Separate attention should be paid to the gaskets, since the air drums can lead to the fact that the mixing formation is disturbed. This means that you need to separately inspect the laying of collectors, nozzles seals, etc.

Floating turnover: Causes

Note that in some cases, the turnover is not just slowly falling or kept at one level, but "float". In this case, the engine can work unstable. First fall, then grow sharply and everything is repeated. Frequent cause of such a phenomenon is the supply of excess air, which leads to the "jumps" of turns on the XX.

Such problems arise in case of failure of the air supply sensor (), which allows the ECU to calculate how much air has been received and how much fuel is applied to prepare the necessary mixture.

If the failures arise, the control unit cannot prepare the "correct" mixture for the XX mode, which causes speed jumps after the release of the gas pedal or during the operation of the motor at idle.

Let's summarize

As you can see, to accurately determine why the engine turns are not reset, in many cases there may be in-depth diagnosis. For carburetor engines, cleaning and adjustment of the carburetor itself is often needed, while for the injector it will be necessary.

If the problem does not lie on the surface (zakis the valve cable, after washing or dry cleaning, the mat is incorrectly laid in the cabin, which presses the gas pedal, etc.), then it is better to deliver the car to the service.

The most difficult situation is such when it assumes the presence of a large number of sensors and actuators. In this case, even the use of diagnostic equipment does not always allow you to quickly and accurately determine the problem.

If the diagnosis is difficult to optimally deliver the car to such a service that specializes in the repair of a particular car brand. As a rule, these are official dealerships, less often you can meet third-party organizations.

Finally, we note that the timely detection of the problem allows you to save other nodes and aggregates. In other words, high curvatures of XX, speeding turns and jumps indicate that there are problems with air / fuel supply or with mixing formation. Ignoring such problems negatively affects the engine and the service life.

Read also

Why the engine may have increased idling speed. The main causes of high XX turns on the injection motor and engines with a carburetor.

The engine twisted at idle: why is it happening. Engine twitching in XX mode, diagnostics of possible malfunctions, recommendations.

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.

City	Cost
Moscow	700 rub.
St. Petersburg	650 rub.
Yekaterinburg	500 rubles.
Samara	500 rubles.
Krasnodar	550 rub.

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.

Often, car owners are faced with such a malfunction when the engine is not falling when the engine is not falling, more precisely, they do not fall to the normal level of idling (XX). This applies to both the injector fuel supply system and carburetor.

Usually, idle speed of gasoline passenger cars, depending on the motor model, are within 650-1000 rpm. Any deviations from these indicators indicate the incorrect operation of the car supply system. With the elimination of this malfunction, it is not worth tightening, since the increased engine speed leads to an increase in fuel consumption in the car and accelerating the wear of the motor, which negatively affects the driver's financial condition.

Sometimes the reason can be wounded in excessive enrichment of the fuel and air mixture supplied to the cylinders. It provokes the growth of revolutions to some level, after which the engine begins to "chop up", thereby reducing the turnover to normal value, after which they rise again. This malfunction causes the "floating revolutions" effect, but the problem may be in other disorders of the power system. In addition, you should not forget that malfunctions in cases with injection and carburetor motors will be different.

Main engine malfunctions with carburetor power supply system

• The occurrence of the needle valve responsible for adjusting the gasoline level in the float chamber.
• The loose closure of the throttle is often happening when it is clogged or mechanically damage. The contaminated valve should be cleared with a special tool that can be purchased at the auto parts store. And with mechanical damage to this node, most often, the complete replacement of the carburetor is required.
• Incorrect adjustment of the XX system. This problem often appears after cleaning or replacing the carburetor. To eliminate, it is necessary to simply adjust it, providing the optimal ratio of gasoline and air in the fuel and air mixture.
• Stable high idling may indicate a loose closure of the throttle, located in the primary chamber. Such a problem appears due to the wear of the throttle damper cable or deformation of the damper itself.
• Damage to the intake manifold or wear of the gasket between the GBC or the carburetor.

In the case of an injection system, possible reasons for increasing idolotes are noticeably more. This is due to the fact that they can be associated both with the failure of mechanical components and a malfunction of electronic sensors.

Major malfunctions injector

• Fault Cooling fluid temperature sensor. Interruptions in the operation of this sensor lead to the fact that the motor constantly functions on elevated circulation, in warm-up mode. At the same time, after warming up the power unit to the operating temperature, the electronic control unit does not reset the revolutions to normal values, since the sensor signals that the engine has not yet warmed. The same happens with the improper functioning of the idle regulator.
• The throttle adjustment cable is hot. Especially often it happens on cars with great mileage.
• Disrupting the performance of the controller of the XX or its electronic sensor, while the turnover at idle can increase or disappear.
• Throttle position sensor fault.
• Scapping or excessive stretching of the return spring, which should return the flap in the original position.
• Violation of the integrity of gaskets, rubber seals injectors or the collector himself. With these problems, excess air from the environment falls into the combustion chamber.

The most banal cause is that when the gas is discharged, the engine revolutions do not fall to idle, there may be an inaccient placement of the rug under the accelerator pedal after visiting the car wash.

Let's summarize

First of all, the malfunction of the injection and carburetor system, you should begin to diagnose from inspection of the throttle.

In the case of an injection engine, a computer diagnostics will help to accurately determine the problem of a specific sensor. To do this, it is best to use the services of a service that specializes in servicing cars of a particular brand.

Often, car owners are faced with such a malfunction when the engine is not falling when the engine is not falling, more precisely, they do not fall to the normal level of idling (XX). This applies to both the injector fuel supply system and carburetor.

Usually, idle speed of gasoline passenger cars, depending on the motor model, are within 650-1000 rpm. Any deviations from these indicators indicate the incorrect operation of the car supply system. With the elimination of this malfunction, it is not worth tightening, since the increased engine speed leads to an increase in fuel consumption in the car and accelerating the wear of the motor, which negatively affects the driver's financial condition.

Sometimes the reason can be wounded in excessive enrichment of the fuel and air mixture supplied to the cylinders. It provokes the growth of revolutions to some level, after which the engine begins to "chop up", thereby reducing the turnover to normal value, after which they rise again. This malfunction causes the "floating revolutions" effect, but the problem may be in other disorders of the power system. In addition, you should not forget that malfunctions in cases with injection and carburetor motors will be different.

Main engine malfunctions with carburetor power supply system

• The occurrence of the needle valve responsible for adjusting the gasoline level in the float chamber.
• The loose closure of the throttle is often happening when it is clogged or mechanically damage. The contaminated valve should be cleared with a special tool that can be purchased at the auto parts store. And with mechanical damage to this node, most often, the complete replacement of the carburetor is required.
• Incorrect adjustment of the XX system. This problem often appears after cleaning or replacing the carburetor. To eliminate, it is necessary to simply adjust it, providing the optimal ratio of gasoline and air in the fuel and air mixture.
• Stable high idling may indicate a loose closure of the throttle, located in the primary chamber. Such a problem appears due to the wear of the throttle damper cable or deformation of the damper itself.
• Damage to the intake manifold or wear of the gasket between the GBC or the carburetor.

In the case of an injection system, possible reasons for increasing idolotes are noticeably more. This is due to the fact that they can be associated both with the failure of mechanical components and a malfunction of electronic sensors.

Major malfunctions injector

• Fault Cooling fluid temperature sensor. Interruptions in the operation of this sensor lead to the fact that the motor constantly functions on elevated circulation, in warm-up mode. At the same time, after warming up the power unit to the operating temperature, the electronic control unit does not reset the revolutions to normal values, since the sensor signals that the engine has not yet warmed. The same happens with the improper functioning of the idle regulator.
• The throttle adjustment cable is hot. Especially often it happens on cars with great mileage.
• Disrupting the performance of the controller of the XX or its electronic sensor, while the turnover at idle can increase or disappear.
• Throttle position sensor fault.
• Scapping or excessive stretching of the return spring, which should return the flap in the original position.
• Violation of the integrity of gaskets, rubber seals injectors or the collector himself. With these problems, excess air from the environment falls into the combustion chamber.

The most banal cause is that when the gas is discharged, the engine revolutions do not fall to idle, there may be an inaccient placement of the rug under the accelerator pedal after visiting the car wash.

Let's summarize

First of all, the malfunction of the injection and carburetor system, you should begin to diagnose from inspection of the throttle.

In the case of an injection engine, a computer diagnostics will help to accurately determine the problem of a specific sensor. To do this, it is best to use the services of a service that specializes in servicing cars of a particular brand.