Engine speeds are not falling at idle: how to fix the problem. Low idle speed on a heated engine: causes and methods for solving a malfunction on the carburetor engine are not immediately falling

27.07.2020

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 all models passenger cars idling 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 high turnsoV, it should be remembered that the problem can be called different faults on carburetors 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 causes for increased ropes more. In particular, the problem may be caused by both mechanical faults and the refusal of electronic sensors. But, in contrast to simpler carburetors, it is simplified by the presence on-board computerwhich 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 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 operating temperatureThe turnover should fall to their norm. Indicators for each specific model vehicle The manufacturer indicates the instruction 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 may high level of fuel in float chamber Carburetor. 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:

Wrong work temperature sensorinstalled 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.
The cable regulating the work of the throttle can ignite. Than more mileage The car, the higher the risk to face a similar problem.
The electronic XX operation sensor often comes into a malfunction, then turnover will be or grow or will disappear.
The spring, leading the throttle to the original closed position, incorrectly functions, scores or is very stretched.
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.
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, then in different time Miscellaneous amount of oxygen is supplied, as a result, surround jumps are observed approximately every 3 seconds.

Faced with a similar phenomenon, there will be a prerequisite 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 conduct an expensive overhaul Engine ahead of time.

Hello, dear friends! By exploiting their car, almost every driver faces certain difficulties and problems. Someone , Outdoor Tosol boils, and thirdly and at all do not fall the engine speed at idle. Between O. last Situation We are talking to you today.

This is a widespread malfunction at which the engine is constantly holding turns. Leaving the motor at idle (XX), the tachometer arrow does not want to fall down.

Such situations are found practically everyone who has an injector and carburetor under the hood, diesel and gasoline DVS. At the same time, the causes for injectors and carburetors are different. Let's look at them and look more carefully.

How to determine the presence of a problem

First you need to understand how you can independently determine the increased or simply abnormally high revs on your own car. After all, even at idle a certain level of revolutions, it must be consistently supported.

In practice, determine the sharply appeared problem is quite simple. Even in those situations when he has a newcomer, and he has no special experience in such matters. First of all, you can just listen to the work of the engine. The lower the engine turnover, the quieter in the end it will work. But it is even easier to diagnose the problem with which is installed on the overwhelming number of passenger and trucks. Look at the position of the arrow and fix what kind of turnups you see when driving in a measured, calm pace, and that the device shows after warming up or when the gas is discharged.

Depending on the engine, for each power aggregate There are turns of the revolutions at idle. This is usually from 650 to 950 rotations for a minute.

Now look at the instruction manual. There are necessarily indicated parameters of the norm for the XX. If current values \u200b\u200bdiffer from the indicators from the manual, this can be considered a deviation. That is, you need to start looking for a provocation factor.

Owners injector engines The onboard electronics helps perfectly. If the speed on the XX turns out to be higher than the manufacturer of the norm, the engine check light will probably light on the dashboard. Here I advise to look into our material where we talked about and their meaning.

Possible consequences

Similar phenomena are found on a large number of cars. Almost any modern and fairly old engine is able to present to your owner such a surprise. It can be:

VAZ 2109;
Renault Logan 1.4;
VAZ 2107;
VAZ 2110;
Chevrolet Sens;
Mitsubishi Lancer 9;
Niva Chevrolet;
VAZ 2114;
Kia Cherato;
Chevrolet Lacetti;
Chevrolet Lanos;
Toyota Corolla, etc.

It would seem, well, revolutions rose, but nothing is happening.

In fact, the engine can occur the processes initially invisible to the driver. But gradually the consequences will be apparent and often frightening their cost of recovery.

It is impossible to leave the speed of revolutions at idle.

This can be explained by several basic possible consequences.

Here we are talking about such potential problems:

The fuel consumption will constantly increase, which will negatively affect your budget;
The hot engine leads to problems with the cooling system and a general resource reduction;
Often fuel tritely will fly into the pipe, which threatens him also detonation in the exhaust system;
Will begin to reduce the overall resource of the power unit;
A node will suffer with which the increase in revolutions is associated.

The reasons are quite a lot in order to promptly take measures and eliminate the provocation factor.

Falling turns on carburetor engine

Despite the new environmental norms, in our country the number of cars with carburetor engines is quite impressive.

If you have noticed that on this engine, the turns are held on a sufficiently high mark at the XX, the reasons can be wounded in the following:

The idling system is incorrectly adjusted. If recently interfered with it, be sure to check the current setting;
Problems with . The increase in idle speed can be due to its improper closure. Check the damper on the subject of nagar. Anxiety is still possible or crack. Here only replacement;
Needle valve. Cause in its location. It is possible when an incorrect dosage of fuel falls into the chamber;
Block head gasket. She tritely struggling. Will have to change;
Success is open. To check, you need to evaluate the work of the damper in the primary chamber. If there is a problem, check the support of the supply. Usually the problem is solved by lubricating the drive and cable.

It is these reasons most often manifest on cars with carburetor engines, when at idle turns remain on abnormally high level. They are potentially considered in situations when the engine Almost immediately.

There is another option, relevant for carburetor and for injector DVS. Here we are talking about sticking gas pedals.

Problems on the injector

Separately, it should be considered situations, due to which the XX turns can increase on the injection types of engines.

Unlike carburetor engine, where all the problems lies in the mechanical part, the injector has a high probability of electronic faults.

Disruption of performance or failure of the sensor controlling the temperature of the coolant. This is a drive to permanent operation in Harting mode. Need a diagnostic scanner and probably replacing the controller;
Violation of the work or breakage of the XX sensor. He is the sensor mass flow of air. It will help the diagnosis of special equipment. Exclude a wiring break using a multimeter, replace the node as necessary;
The same problems, but already with the throttle position sensor. That is, throttle. The controller either jammed, or he broke;
Return spring flap. It can stretch or jump, causing the appropriate behavior of the motor at idle. The node returns to the place or changes to the new one;
Hall The throttle valve cable. Actual for old cars. Replacing or lubrication will help solve the problem;
Sealing gaskets on nozzles. They are damaged not so often. Diagnose the problem is difficult. Tested usually last.

Be careful, running And watching the behavior of the tachometer in his car. If you see that the turnups float, rise to abnormal marks and behave uncharacterously, do not ignore such symptoms.

Increased engine speed at idle or while driving - a sign that the motor is not in order. Such behavior of the power unit leads to an increase in fuel consumption and increased wear of engine parts. Therefore, this defect must be eliminated as soon as possible.

Description of the problem

When starting the engine, the turns rise to about 1500 rpm at idle. After warming up the engine, they decrease in about 650-950 rpm, which is the norm. If after warming up the turns remain at the same level, the motor works incorrectly.

The second option when the defect is found, this is the absence of a car fall when the gas is discharged while driving, that is, when braking the engine and riding the ride. In this case, the turnover seems to be "frozen" at the mark above 1000 rpm until the car stops complete, although in serviceable machines should fall below the specified mark.

It is easy to determine that the machine works at elevated revolutions simply. If a dashboard The car is equipped with a tachometer, then high speed is displayed on it. In the case when the tachometer is not, then the increased turnover can be determined by the sound of the engine. The more their number - the higher the tonality and louder the sound of the engine.

Main reasons

The reasons are the speed of the power unit are not reduced, differ in cars with injection and carburetor motors.

On carburetor engines

In cars equipped with carburetors, it is this node that is responsible for the preparation and supply of the air-fuel mixture in the combustion chamber. Most often, problems with elevated revolutions are associated with re-enhancing the fuel and air mixture, but other causes of malfunction can also occur.

The effect of increased revolutions can be caused by the following problems.

The incorrect operation of the throttle is responsible for air supply. If the flap after the gas reset or the engine warming cannot closer, and the gap is formed in it, the enriched fuel and air mixture is enriched into the engine.
Open Side. SUPPLICATIONS - Handle adjusting the air damper responsible for air flow into the carburetor. With it, you can enrich the fuel and air mixture with air. With an incorrectly working sacrifice, the mixture is re-enricged by air.
Binding needle valve. In this case, the incorrect dose of fuel will flow into the fuel combustion chamber. Needle valve malfunction can manifest in different ways, including the lack of inclination.
Invalid idle adjustment. With such a problem, car owners who changed or repairing the carburetor are often faced.
A rather rare cause is the root of the cylinder head gasket. The problem is manifested not only by the increased turnover of the engine, but also by the appearance white smoke From the engine compartment.

On injection engines

Car equipped with injection engines, the range of reasons for increased revolutions is wider. This is due to the fact that there are much more in such machines electronic devices and sensors responsible for the transfer of information in the electronic unit Control controlling motor turnover. Therefore, violations of the operation mode of the engine can be associated with mechanical damage, and with a malfunction of electronic systems.

The reason for the increased revolutions of injection engines can be one of the following problems.

Incorrect work or failure of the coolant temperature control sensor. With this malfunction, the engine constantly works in warm-up mode, since the ECU (electronic control unit) does not receive information from the sensor that the motor is already heated. As mentioned above, in such a mode of motor turnover.
Breakfast of the mass flow rate of fuel (DMRV), which is also referred to as the idle sensor. The DMRV malfunction can manifest itself in different ways - disappearing or increasing revolutions. In the latter case, the engine also goes to constant warm-up mode.
Throttle position sensor fault. In this case, the sensor malfunction can be perceived by the ECU as information about the open throttle. Then the control unit gives a team to increase the revolutions.

Also, the reasons for the increased turnovers of injection engines can be associated with mechanical damage.

The breakdown of the return spring throttle.
Singing the throttle cable.
Damage to the gaskets of the nozzle.

What to do

To solve the problem, it is necessary to diagnose it. On cars equipped with carburetor engines, successively checked and faults are corrected.

The incomplete closure of the throttle is most often due to the formation of rigging products. In this case, it needs to be easy to clean with a carbcliner. If the throttle is not closed completely due to the chip or crack, it will have to be replaced.
Sack fault can be eliminated by lubricating the cable and the air damper drive.
The problem of the needle valve is solved by replacing the part.
Incorrectly configured idling can be corrected, adjusting it correctly.
Burned gLP gasket Changes to a new one.

Solving problems with electronic sensors injector engines is almost always solved by their replacement. Their fault is manifested by the appearance of the inscription Check EngineAfter diagnosing the scanner, you can get an error code indicating a specific problem. Also, to diagnose sensors malfunctions, you can use a multimeter in the module mode.

How to avoid the problem

If all the parts and knots of the car are in order, then the problem is equipped with cars equipped injector injection Fuel, may wage in the computer firmware. It is the control unit regulates the engine speed and the composition of the air-fuel mixture entering the cylinders. To avoid further the problem of preserving high revolutions after the gas discharge or warming the motor, you can reflash the electronic control unit.

Another reason is that the revolutions are saved when driving, it may be a rug, watering the gas pedal. In this case, the accelerator pedal is not fully determined, which leads to excessive enrichment of the fuel and air mixture. To prevent the problem, you just need to fix the rug.

Almost each of the owners of domestic vases came across the problem of high idle speed. That is, when the engine is started, the turnover is assessed, however, when heating the engine is not falling below 1500 or 1000 revolutions, which is not normal. There may be several reasons for this - and incorrectly working DPDZ and idle regulator.

To resolve the problem, you should diagnose the main nodes and components that affect the increase in revolutions.

Why can there be high idle speed

One of the main reasons may be the failure of the PCX - the idle regulator, it is he who is responsible for adjusting the engine speed at idle. When, turnover can "swim", increase and decrease spontaneously. With the full failure of the sensor, at idle the car can simply blapted.

Also enhanced turns can be caused by a throttle position sensor fault (DPDZ). Over time, the moisture falls under the sensor, which leads to the formation of oxide and rust on the rod of the regulator. To check it, you need to unscrew the sensor and carefully examine it and rod. If rust is detected on them, they should be treated with penetrating lubricant or WD 40.

As a rule, the problem of increased revolutions on the VAZ 2110-12 is precisely in these two sensors. Therefore, first of all it is necessary to pay attention to them.

Where are the sensors of RXH and DPDZ

So, for a start, check the idle regulator sensor stroke RHX. It is located on the throttle node below the DPDZ sensor. Dismantling it is very simple - remove the block from the sensor and unscrew the two bolts of its fastening using a crosst screwdriver. After that, pull out the sensor or make it a diagnosis, read about it below.

The throttle position sensor is located above the RXX and is also fixed by two bolts. It is turned off quite easily, there is no need to remove the nozzle on the throttle, nor the choke itself. Disconnect the block, unscrew two bolts and pull out the sensor.

To make sure that the problem is high turnover really in one of these sensors, and maybe in a friend immediately, they should be diagnosed.

PCH 2110 sensor diagnostics

You can in several ways. To verify, we need a multimeter. To begin with, we describe the easiest way:

The method of checking RXH 1

Disconnect the shoe from the sensor and unscrew the sensor
Turn on ignition
Connect the block to the removed sensor, the needle in the sensor must be advanced, if not, the sensor is faulty

The method of checking RXX 2

Disconnect the minor battery terminal
Multimeter We measure the resistance of the outer and internal windings of the RXX, while the resistance parameters of the contacts A and B, and C and D must have indicators 40-80 ohms.
At zero values \u200b\u200bof the device, it is necessary to replace the RXH to a good, and in case of obtaining the required parameters, check the resistance values \u200b\u200bin pairs B and C, A and D.
Multimeter must determine the circuit break
With such indicators - PCH is working, and in their absence - the regulator is subject to replacement.

The method of checking RXH 3

Disconnect the shoe from the sensor
With the help of a voltmeter, check the voltage - "minus" goes to the engine, and "plus" to the conclusions of the very block of wires A and D.
Ignition turns on, and the data obtained are analyzed - the voltage must be within the twelve volt, if the problem is less than the problem with the battery charge, if there is no voltage, you will have to check the electronic control unit, and the entire chain is completely.
Then we continue to inspect when the ignition is turned on, and alternately analyze the conclusions A: B, C: D - the optimal resistance will be about fifty three ohms; With normal pCH work Resistance will be infinitely large.

DPDC diagnostics VAZ 2110

To diagnose the sensor, we will need a voltmeter.

It is necessary to turn on the ignition and check the voltage voltage between the contact of the slider and minus. On the voltmeter should be no more than 0.7 V.
Now you need to turnplastic sector, completely opening the damper, then make a stress measurement again. The device should show at least 4 V.
Turn off the ignition and disconnect the connector from the sensor. Check the resistance between the contact of the slider and some conclusion.
Slowly, turning the sector, watch the voltmeter testimony. Make sure that the arrow moves smoothly and slowly if you notice the jumps - the throttle position sensor is faulty and is replaced.