We find out the reasons why the VAZ 2114 idle speed fluctuates

During operation (especially long-term), motorists have to deal with the fact that the speed of the VAZ 2114 fluctuates. Frankly speaking, there can be several reasons for this unpleasant phenomenon - we will look at them a little lower. To begin with, it’s worth saying a few words about the idle speed itself.

Idle speed of VAZ 2114

List of main reasons

Reasons why idle speed fluctuates

Incorrect operation of the power unit may be caused by a malfunction of certain elements:

• Failure of sensors:

1. RXX;
2. DMRV;
3. DPKV;
4. Lambda probe;
5. DSA.

• The XX solenoid valve is faulty;
• The air filter is clogged;
• Heavy carbon deposits on candles;
• High-voltage wires are damaged or oxidized;
• Air leak in the intake manifold;
• Incorrect throttle position.

Carburetor internal combustion engines

Here the vast majority of reasons lie in the dosing device itself. High idle speed in this case is due to:

1. Incorrect idle speed setting. It is necessary to adjust the composition of the mixture supplied to the carburetor using the appropriate screws.
2. A jammed air damper: if it does not open completely, little air will flow into the cylinders.
3. The shutter of the 1st chamber. It may not close completely due to a mechanical defect or an incorrectly adjusted actuator.
4. Fuel level in carburetor float chamber too high

Ignition system

The reason for floating speed may lie in a damaged ignition distributor cap, high-voltage wires or spark plugs. These elements should be checked and replaced if necessary.

It is also worth noting completely banal reasons that are typical for both types of engines: incorrect adjustment of the accelerator pedal drive and jamming of the accelerator pedal itself, associated with corrosion of the mounting shaft and spring due to the car being idle for a long time.

How does this happen

If the car is running normally, all you need to do is start it and wait until the engine warms up to the optimal temperature. The tachometer indicator at this moment is at 2-2.5 thousand rpm, and then gradually drops to about 800 rpm as the power unit warms up.

But when there are problems, the idle speed jumps and changes sharply. The range of revolutions difference on the tachometer can be significant, up to 1.5 thousand revolutions. The car seems to live its own life. After some time, this phenomenon stops. But the next time the ignition is turned on, everything repeats.

Why does the VAZ 2114 fluctuate at idle?

The “fourteenth” model from the domestic automaker AvtoVAZ gained enormous popularity in its time due to its reliability, workmanship, responsiveness and agility of the power unit.

Of course, this car cannot be called ideal. Therefore, problems may arise from time to time. It is not uncommon for the rpm to fluctuate at idle. Such phenomena irritate the driver and lead to unpleasant scenarios on the road. For example, at any moment the engine may simply stall.

It is unlikely that you will be able to solve the problem for a long time by pressing the accelerator pedal in order to maintain speed. Therefore, more drastic actions need to be taken.

Idling

Idling of a car is the operation of its engine when the gear is in neutral. At the same time, the fuel load, as well as the load on the engine, is minimal.

Idling is used in several cases:

1. To “bleed” the oil after the car has been parked for a long time.
2. To warm it up during cold weather.
3. To keep the engine running for a long time without driving the vehicle.

Idling VAZ 2114

Engine idle operation looks like this: first, the speed quickly rises to 2,000 or even 2,500 rpm, after which it gradually decreases and stops around the 800 rpm mark.

This type of engine operation is absolutely normal. If, in idle mode, the VAZ 2114’s revolutions jump (either sharply increase or drop sharply, and the interval of “jumps” can be up to 1,500 rpm), then a malfunction has occurred in the engine system. In most cases, such a sharp fluctuation in speed leads to the engine stalling.

Despite the common opinion, driving a car with “floating” speed is unacceptable, as this can lead to serious consequences, including engine damage. When the first signs of this phenomenon appear, travel should be stopped and urgent repairs performed.

Idle speed control

The first thing you should check is the idle speed control. To do this, you will need a tester (multimeter) set to ohmmeter mode.

The check is performed as follows:

• turn off the ignition;
• disconnect the block;
• measure the resistance between contacts A * B and C * D of the regulator. If it is working properly, the device will show a resistance value in the range from 40 to 80 Ohms;
• measure the resistance between contacts B * C and A * D. If the regulator is operational, the ohmmeter will go off scale (on some devices an “open circuit” may be indicated).

Dirty IAC VAZ 2114

If the results obtained during measurements differ from those given above, then the idle speed controller is broken. By the way, its failure is one of the most common reasons why the idle speed of a VAZ 2114 injector fluctuates. If a breakdown is detected, the part should be replaced with a new, similar one (since the IAC is not a repairable device). Do not forget that before starting to replace the device, you should disconnect the battery ground terminal.

After the new regulator is installed, it should be “calibrated”. To do this, turn on the ignition for 10 seconds and then turn it off. There is no need to start the engine.

Injector

Here everything is much more complicated: the operation of an injection engine is associated with many sensors, ECUs and other elements of the power unit, in particular the fuel system. But first things first.

Idle air control sensor (IAC)

If this device is faulty, the engine may stall at idle, or its speed will float, making jumps in the range of approximately 600-1200 rpm. Therefore, it is necessary to ensure that the device is working properly. This can be done using a multimeter. Procedure:

1. First, measure the supply voltage on a pair of outer terminals A and D. To do this, place the black probe of the device to ground (any unpainted metal part of the car body), and the red one to the indicated terminals in turn. When the ignition is on, there should be 12 V. If this is not the case, check the voltage at the ECU terminals (for the VAZ 2110 these are pins 4 and 54). If there is 12 V here, look for an open circuit in the wiring.
2. Set the tester to ohmmeter mode. Resistance between terminals A and B, C and D: should be 40-80 Ohms.
3. Check the motor for short circuit. To do this, measure the resistance between A and D, B and C: the arrow of the device should tend to infinity.

That is, a throttle position sensor, which is responsible for the amount of fuel mixing with air. If the fuel supply is incorrect, the ECU will automatically give a command and the idle speed will increase. Therefore, it is necessary to check the TPS:

1. Unclip the connector that fits the sensor: you will see 3 contacts: for the control signal, power and ground.
2. Start the engine and measure the voltage at the power terminal: it should be approximately 5 V.
3. Stop the engine and switch the tester to resistance measurement mode (throttle valve closed). Measure it between ground and signal contact: it should be 0.8-1.2 kOhm. When the damper is closed, the value is 2.3-2.7 kOhm.

How to remove and install a new sensor

To dismantle, simply unscrew a couple of mounting screws. Next, disconnect the end of the damper shaft and, rotating the new sensor, align the holes to screw in the screws. Put the connector on.

After completing the work, it is necessary to delete the error from the controller’s memory. To do this, remove the terminals from the battery for a period longer than 8 hours. If the error has not cleared, try driving in a gentle mode so that the ECU resets it itself. If you fail again, you will have to contact a car service (you will need a motor tester).

Throttle valve

Jamming of this mechanical device will result in an increase in the amount of air supplied to the cylinders. As a result, the ECU will work again and begin to increase the volume of fuel to balance the mixture. To solve the problem, remove the damper and clean it with chemicals. If there is no result, the part will have to be replaced.

Engine ECU

Very often the cause of this trouble is the “brain” of the car, that is, the electronic control unit. If any sensor responsible for the correct operation of the internal combustion engine breaks down, or if foreign air enters, the computer cannot give a specific and accurate command to the system, which leads to floating speed. In this case, you should go to a service center and diagnose the ECU, since it is unlikely that you can determine error codes and malfunctions on your own without special tools and devices.

Sensors and their malfunctions

Of course, if the ECU issues incorrect commands, this does not mean that it is faulty. The cause of breakdowns should be sought in the following sensors:

1. IAC (idle air regulator).
2. MAF (mass air flow sensor).
3. EGR.

It is because of these parts that the speed on the VAZ-2114 most often fluctuates.

If all these elements are working correctly, you should diagnose the spark plugs and check the condition of the air filter. By the way, sometimes the cause of floating speed is not the sensor itself, but its electrical wiring.

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Air flow sensor

If the IAC turns out to be serviceable, then you should check the air flow sensor. To do this, you will also need a multimeter set to voltage measurement mode (in the range of up to 20 volts).

Measurements are carried out as follows:

• turn off the engine and turn on the ignition;
• measure the voltage at the sockets used to connect the yellow and green wires;
• if the voltage value is in the range of 0.98 - 1.02 volts, then the sensor is working. If not, then action should be taken.

DMRV VAZ 2114

To begin with, you can try to clean the sensor by blowing it with a composition for cleaning carburetors (in the form of an aerosol), although this does not always help. If after purging the voltage readings return to normal, then the “repair” was successful; if not, then the sensor will have to be replaced with a new, similar one.

Serviceability of the mass air flow sensor

To diagnose the mass air flow sensor, you need to switch the tester operating mode to “voltmeter” (20 V). We check the part by following these steps:

1. Let's turn off the engine and turn on the ignition.
2. Let's measure the voltage at the connection connector between the contacts of the green and yellow wires. The multimeter reading should be in the range of 0.99 - 1.02 V.

The device can be cleaned by “blowing” it with a carburetor cleaning aerosol.

Attention! The device can be dismantled and cleaned using a carburetor aerosol, but this does not always help. In the event of a critical component failure, it will have to be replaced.

Causes

The most dangerous thing in this case is inaction. Today we will talk about why the idle speed on the VAZ 2114 jumps, what are the reasons and what actions should be taken in this or that situation.

In fact, the reasons can be very different, so we will try to comprehensively study this issue.

Electronic control unit

It is not uncommon that the electronic brains of the VAZ 2114 car become the source of all problems associated with idle floating speed. If a sensor fails, this affects the ECU receiving incorrect information. Consequently, the engine does not operate at the parameters it needs.

Unfortunately, it will not be possible to independently diagnose and identify malfunctions of the electronic control unit. This requires appropriate experience, special equipment and tools. Therefore, this issue is resolved in a high-quality car service and nothing else.

Sensors

If the injection VAZ 2114 stalls at idle, the problem lies in the sensors sending incorrect signals to the electronic control unit.

There are three sensors that may cause engine malfunction:

• Idle air control or IAC;
• Mass air flow sensor or mass air flow sensor;
• EGR.

If the check shows that the sensors are working properly, then the causes of the breakdown should be looked for in the spark plugs and air filter. And don’t look for the problem only in the sensor itself. It is possible that the wiring connecting it to the ECU is damaged.

Let's look at problematic sensors that potentially cause floating speed in more detail.

EGR

This valve is a sensor that belongs to the exhaust gas recovery system. The valve sends some of these gases into the combustion chamber, which ensures more efficient combustion of the fuel. Consequently, the level of toxicity of emissions into the atmosphere is significantly reduced.

The device has a simple design, but nevertheless, it is quite rare that it causes the phenomenon that we are considering today.

The valve seat must be cleaned periodically, otherwise it will negatively affect the stability of the injection power unit. If cleaning has not been carried out for a long time, correct the situation. To do this, use special sprays designed for cleaning the carburetor. Just make sure that the substance does not get on the sensor diaphragm.

Fuel pump strainer is clogged

Considering the quality of fuel supplied to our market, you can often encounter a similar problem. If you have checked everything listed above, but still have not figured out the problem, it is better to immediately go to the nearest auto parts store and purchase a new mesh there. The issue price is about 70 rubles.

Then, under the rear seats, we find the hatch and unscrew it, gaining access to the gas tank. We disconnect all the tubes and remove the fuel pump mount and remove the entire mechanism from the tank. A mesh will be attached to the supply to the fuel pump, remove it and install a new one. Afterwards we collect everything back into the gas tank.

Floating speed on the carburetor

On carburetor versions of the VAZ 2114 there is no electronic control unit as such. But this does not mean at all that the problem of floating speed is not alien to him.

Tachometer with high speed

Floating speeds do not occur as often as in the case of an injector, but still. The reasons, as well as troubleshooting methods, vary.

1. The idle speed is set incorrectly, or it got lost during operation. In such a situation, the setting shifts to combining the fuel-air mixture. Here you will need to adjust the speed to the range of 800-900 units.
2. The solenoid valve is faulty. The engine will only run if the choke is pulled out. If you remove it, the engine will immediately stall.
3. The idle jet or channels are dirty. In such a situation, the fuel lacks air. Clean the jet and the problem will go away.
4. Excessive air is sucked in. The mixture becomes leaner, so the engine sputters and stalls.
5. The level of gasoline in the float chamber increases or decreases.
6. The air filter is clogged. The problem is solved by simply replacing the element.

If engine vibration occurs at idle speed of the VAZ 2114, there is no need to worry. It's all about the design of the engine. A similar phenomenon is typical for carburetor engines during cold starts. The engine just needs to warm up to the optimal temperature, after which the vibrations disappear.

The reason for the vibrations is the air-fuel mixture , which is prepared by the carburetor before being fed into the combustion chamber. Low temperatures lead to inefficient combustion of the mixture. Hence the “shaking”.

Although it is not uncommon for vibrations to occur due to the cushions, that is, the engine mounts on which it is mounted. When they wear out, vibrations are possible. Moreover, this does not depend on what type of engine is used - injection or carburetor.

You should always pay attention to the floating speed of the VAZ 2114 and not wait for the problem to manifest itself in some other way. If you delay in identifying the causes and eliminating faults, repairs can be much more expensive.

Methods for solving the problem

Before proceeding directly to the process of solving the problem, you need to understand that diagnostics and repair of these components should be performed only with knowledge of the matter. Also, it is worth separately noting that for a carburetor and injection engine there will be different diagnostic methods, but the principle of the causes is the same.

So, it is worthwhile to consistently understand the diagnostic and repair work that will eliminate high idle speed.

IAC sensor

It is not often possible to find an idle air control sensor on carburetor engines. This is usually done using a quality and quantity screw. To normalize high idle speeds, you should not carry out the process cold. First, you should warm up the engine to operating temperature, and only then begin adjustments. If after making the adjustments the speed remains high, then the reason is different.

For an injection engine, the opposite is true; all adjustments are made by the IAC sensor. In order to correct the malfunction, it is worth checking the sensor with a multimeter, and then, if the element is faulty, replace it with a new one.

The wrong amount of air entering the combustion chamber can cause the ECU to over-idle. If the throttle position sensor is faulty, it must also be checked. This can be done with a multimeter or oscilloscope. If it is discovered that the TPS is faulty, it is worth replacing it.

Throttle valve

A stuck throttle can cause a large amount of air to enter the engine. This fact will force the electronic control unit to increase the amount of fuel injected to balance the mixture. This will increase the fuel consumption and accordingly.

In order to solve the problem, it is necessary to dismantle the unit and clean it using special means. If cleaning does not give the desired result, the throttle must be replaced, but you should be prepared that this will not be cheap.

Do-it-yourself troubleshooting

Many faults from the above list can be eliminated yourself in a few minutes. It will take much more time to identify.

Diagnostics of mass air flow sensor and IAC

The mass air flow sensor and idle air control act as regulators of air supply to the combustion chamber.

We have already written in more detail about diagnosing the air flow sensor; you will need a multimeter!

Failure of these sensors will lead to an increase in fuel consumption, and a broken rod will affect the speedometer needle; it will remain motionless until the problem is fixed.

Checking the functionality of the idle air regulator

Checking the performance of the mass air flow sensor

If any malfunctions are detected, the idle air regulator must be replaced with a new one!

IAC failure and serviceability of the mass air flow sensor

Failure of the required regulator is one of the main reasons for the appearance of floating speed, which leads to dismantling the device. Here it is very important to leave the power supply turned on, because the electronic unit itself will not calibrate. The air flow device needs to be cleaned with a special aerosol for carburetors, although this action does not always help! In this case, replace.

If necessary, clean the throttle valve with a brush and cotton swabs, after moistening them with a solution, and blow all channels and pipes with air from the tire inflation pump.

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The channel that removes gases from the crater is completely filled with solution, because the diameter of the crater is small and there is no other way to perform this operation.

The article discusses the main points of work to eliminate floating speed in the car at idle. If everything is done according to these instructions, the problem will be eliminated, but if a positive result is not achieved, be sure to contact a service station for help from qualified technicians. Without solving this problem, it is not safe to use the machine!

Diagnosis of DPCV

Crankshaft rotation sensor location

Failure of the crankshaft position sensor will negatively affect the operation of the engine as a whole. A failure in synchronization between the engine and the injection system will result in the car not starting. You can accurately determine the condition of the sensor only by using a multimeter.

To do this you need to do the following:

• Set the sensor to a position with a maximum value of 200 mV;
• Connect the multimeter and close the core with a screwdriver;

• Checking DPKV with a multimeter

• The voltage should jump; in case of a negative reaction, the sensor must be replaced.

Video about checking the crankshaft rotation sensor

Lambda probe diagnostics

Location of the oxygen sensor (lambda probe)

The sensor reads the amount of oxygen in the exhaust gases and sends a signal to the computer to increase or decrease the air supply to the combustion chamber. Diagnostics is performed with a multimeter on a warm engine. The procedure is as follows:

• One core of the device clings to the ground, the second to the output from the sensor;
• When re-gassing the engine, the multimeter readings should be in the range from 0.2 to 0.9 V;

• When checking the lambda probe, the voltage readings should be within 0.2 - 0.9V

• Other readings indicate the need to replace the sensor.

Video about checking the lambda probe

Speed ​​sensor diagnostics

Speed ​​sensor

The vehicle speed sensor is located in the gearbox. Its diagnosis is carried out by visual inspection of wires and contacts . If oxide is detected, it must be thoroughly cleaned.

Replacing the air filter and glow plugs

Air filter for VAZ-2114

The presence of a large amount of dust on the body and inside the air filter requires its immediate replacement.

Since its throughput is reduced, the engine does not have enough air in the combustion chambers . Due to this, the fuel does not burn completely, and the remaining fuel is thrown out and burns out in the exhaust pipe, which can burn out as a result.

Changing the air filter

We clean carbon deposits or replace spark plugs

Heavy carbon deposits on the spark plugs or any mechanical damage to the housing require their replacement.

Oil deposits on spark plugs

Important! If the machine was operated with this malfunction, it is recommended to replace the spark plugs, since, due to high fuel consumption, they will be flooded.

Checking wires

The easiest way to diagnose high-voltage wires is in the dark; to do this, just open the hood. If the wire is “broken,” a spark will be visible striking to the side .

Visual inspection of high-voltage wires

Another reason lurking in this place is poor contact, the appearance of oxide. To do this, you need to visually evaluate the wire tips (white, blue or green coating); you need to thoroughly clean them, wash them with Wedge (WD-40), dry them and put them in place.

Healthy! Don't forget about the term "metal fatigue". This refers to the deterioration of current conductivity due to the fact that the contacts are in constant voltage mode. Therefore, high-voltage wires should be periodically replaced with new ones (their specific service life depends on the manufacturer and is indicated on the packaging).

Checking the intake manifold

Most often, air leaks occur through the connection of the intake manifold to the cylinder block . This happens due to wear of the gasket. This is not difficult to identify. To do this, you will need regular carburetor cleaner. With the engine running, you need to spray the can on all connections and places that cause you suspicion (microcracks in the commutator body itself are also possible).

Checking the intake manifold

If the engine runs without changes, then the cause of the malfunction is not here. If the engine speed increases and the engine jerks, the manifold or intake manifold gasket should be replaced.

Healthy! There is no need to solder and glue the intake manifold. The patch will not stay in place for long and after a while the problem will arise again.

Cleaning the throttle valve

The throttle valve needs regular cleaning of carbon deposits.

Due to heavy carbon deposits, the throttle valve may be in an incorrect position. To fix this, you will need to remove the throttle assembly and clean it with a carburetor cleaner or carburetor cleaner, and then reinstall it.

Healthy! The assembly should be washed thoroughly; you can soak it in gasoline for a while.

Floating speed is a standard disease of injection engines. The fact is that the ECU, when receiving an incorrect signal from a non-working sensor, mistakenly opens the air supply solenoid valve . The TPS gives a signal that this cannot happen, and the engine has already left the warm-up mode. It is at this moment that the idle speed of the VAZ-2114 begins to float. Therefore, if such a problem appears on your car, do not be upset. If the cause is detected and eliminated in a timely manner, there is nothing to worry about.

Methods for eliminating floating engine speeds

When starting to find and eliminate the reasons that cause unstable operation of the engine in idle mode, you first need to check:

1. Condition of the air filter and spark plugs. If they become critically dirty, they need to be replaced.
2. Integrity of insulation of high-voltage wires. If damage is found, they must be replaced.

It is recommended to make sure that there is no suction at the junction of the intake manifold with the engine cylinders. To do this, with the engine running, you need to sequentially spray all joints at the joints with carburetor cleaner or other flammable liquid. If atmospheric air enters there, the car engine jerks sharply, which is why, if a damaged gasket or plug is detected, the element is replaced.

Checking the tightness of the intake manifold (video guide)

Let's consider the remaining elements of the car, the malfunction of which can affect the smooth operation of the VAZ 2114 engine in idle mode.

Solenoid valve diagnostics

Cars with engines equipped with a carburetor are equipped with idle speed solenoid valves. Devices are checked as follows:

1. Disconnect the power cord.
2. Start the engine to warm up.
3. Connect the wire. If a clear click is not heard, the part must be replaced.

Attention! To fully ensure that the valve is working properly, be sure to clean the nozzle and repeat the test.

Is the EGR system on the injector working?

"Floating" speed can be caused by jamming of the exhaust gas recirculation (EGR) valve, which is installed in the exhaust manifold. It is necessary to periodically remove dirt from the valve seat and its seat using a carburetor cleaning aerosol, avoiding liquid getting on the sensor diaphragm.

Keep the valve seat clean

Attention! If cleaning the unit does not give a positive result, the device must be replaced.

Adjusting the idle speed on a carburetor engine (with video)

Note that the main reason for the appearance of floating idle speed in engines of this type is the incorrect operation of the carburetor. The device is adjusted by rotating the fuel quality and quantity screws.

Is the idle air control valve working correctly?

The IAC is checked by measuring the electrical resistance at the contacts - to diagnose the device you will need a tester (multimeter) set to the “ohmmeter” operating mode. To check the details:

1. Let's turn off the ignition.
2. Disconnect the connection block.
3. Let's measure the resistance on contacts A - B and C - D of the device. The optimal readings of the device vary from 40 to 80 ohms.
4. Let's repeat the measurements with contacts B - C and A - D. In this case, the multimeter should show “infinity” or an open circuit.

Any violation of the normal resistance values ​​means a malfunction of the regulator. IAC failure is a common cause of floating engine speed at idle, and if a malfunction is detected, the device must be replaced. Before you begin dismantling the part, you must disconnect the negative wire from the battery. After installation, the new IAC is calibrated - the removed terminal is returned to its place, the ignition is turned on and after 5-10 seconds (there is no need to start the engine).

IAC failure is a common cause of floating engine speeds.

Attention! If the battery is not disconnected before dismantling the device, the electronic control unit will not calibrate the IAC.

Cleanliness of the damper assembly

The throttle valve assembly is diagnosed by visual inspection for contamination. Clean the part with cotton swabs and a toothbrush moistened with a cleaning solution. For ease of work, the device is dismantled. After cleaning, it is recommended to blow out all channels and pipes of the unit with compressed air using a tire inflator.

To clean the part, it must be dismantled

Attention! It is recommended that the channel responsible for removing gases from the crankcase be completely filled with a cleaning solution before purging - the diameter of the element is very small and there is no other way to access it.

Video: How to clean the throttle body

Is it possible to diagnose DPKV and DSA?

A breakdown of the DPKV and DSA (Hall sensor) is indicated by the Check Engine indicator that lights up on the car’s dashboard. Testing these devices is only possible using special instruments (oscilloscopes). You can first check the integrity of the wiring; if it is broken, the damage should be repaired.

• The DPKV sensor is installed on a bracket located in close proximity to the generator drive pulley.
• The DSA is located on the speedometer drive mechanism of the gearbox.

For a more detailed introduction to methods for detecting faults associated with engine malfunction in idle mode, it is recommended to watch the following video.

Video: Computer diagnostics of VAZ 2114 idle problems

So, the main steps to rid the car of floating engine speed at idle are considered. Remember: if performing these operations yourself does not lead to a positive result, you will have to contact a service station with the necessary diagnostic equipment and qualified repairmen.

Throttle valve

If after all the checks and measurements carried out above it was not possible to identify a malfunction, then all that remains is to check the condition of the throttle valve assembly. To do this, the part should be dismantled and then cleaned of dirt using cotton swabs. The cleaned part (or rather, all its pipes and tubules) is blown with compressed air using a compressor.

Cleaning the throttle VAZ 2114

Special attention should be paid to the channel that serves to remove gases from the crankcase. Before starting purging, it should be filled with a cleaning compound and allowed to stand for some time, after which the purging itself should be performed. This is caused by the extremely small diameter of the internal channel, as a result of which other methods of cleaning it are simply not available.

In addition to all of the above breakdowns, a breakdown of the DPKV sensor, as well as the Hall sensor, can also lead to “floating” speed. If they fail, the Check Engine light will light up on the car panel. If such a malfunction occurs, it is best to contact a service center, since special equipment is required to check these sensors.

Causes of malfunction

Among the reasons leading to improper engine operation in idle mode are problems with sensors that transmit information to the electronic control unit . These include sensor malfunctions:

• idle speed controller (IAC);
• mass air flow (MAF);
• crankshaft position (CPCV);
• throttle valve position;
• vehicle speed (VSA).

The appearance of floating crankshaft speeds also causes:

• malfunction of the idle speed solenoid valve;
• dirty air filter and spark plugs;
• damage to high-voltage wires;
• wear of gaskets and plugs at the junction of the intake manifold with the cylinders;
• malfunction of the EGR valve, which regulates exhaust gas emissions.

Solenoid valve diagnostics

Cars with engines equipped with a carburetor are equipped with idle speed solenoid valves. Devices are checked as follows:

1. Disconnect the power cord.
2. Start the engine to warm up.
3. Connect the wire. If a clear click is not heard, the part must be replaced.

Attention! To fully ensure that the valve is working properly, be sure to clean the nozzle and repeat the test.

Conclusion

Many car enthusiasts do not know the reasons for the high idle speed effect, much less how to eliminate it. So, of course, experts and car mechanics recommend contacting a car service straight away, but our man won’t stop until he tries it himself.

There are many reasons for the effect of increased speed, from faulty sensors to errors in the electronic control unit. You can also fix the problem at home, which is what owners of VAZs and other domestic cars do. But owners of foreign cars will have to contact a car service center, where repairs can amount to a considerable amount.

Good afternoon. Help with advice. In general, in the cold weather the check light came on. At first the speed just started to jump a little. Now the idle is kept at 1.5k almost all the time. And if you press the clutch at speed, it increases up to 3k. From time to time the check does not disappear for long, but the problem does not go away, you have to revise the throttle all the time so that the speed drops. Also, all this is accompanied by increased gasoline consumption. Unfortunately, there is no BC, and I consider it a waste of money to go for diagnostics; they rarely help anyone significantly.

After reading a lot of posts about this, I realized that it was necessary to sin on one of the following: IAC, DMRV, DPS or lambda probe.

But I changed the pxx recently, when the speed, on the contrary, dropped to 0.5, plus if there are problems with the pxx, the check light does not light up.

The main task of the idle speed system (mode) is to maintain engine speed at a minimum level, ensuring complete combustion of the fuel-air mixture in the cylinders. The number of idle speeds on different engines may vary, the range is 700-950 rpm. Excessively low tachometer readings lead to unstable engine operation, which may stall. On the other hand, high engine speeds at idle are fraught with excessive fuel consumption and more toxic exhaust. Below we discuss the main reasons for the increased and unstable crankshaft speed at idle for a carburetor and injection engine.

Sources

• https://carfrance.ru/pochemu-vaz-2114-plavayut-oboroty-na-xolostom-xodu/
• https://luxvaz.ru/vaz-2114/135-plavayut-oboroty-na-holostom-hodu.html
• https://mashinaa.ru/avtovaz/vaz-2114/6444-plavajut-oboroty-na-holostom-hodu-vaz-2114-inzhektor-prichiny.html
• https://remontvazov.com/plavayut-oboroty-na-holostom-hodu-vaz-2114-inzhektor
• https://FB.ru/article/146420/plavayut-oborotyi-na-vaz—-prichinyi-i-metodyi-ustraneniya
• https://provaz2114.ru/dvigatel/plavayut-oboroty-na-holostom-hodu-vaz-2114-prichiny.html
• https://pol-z.ru/plavayut-oborotyi-na-holostom-hodu-vaz/
• https://prometey96.ru/ustrojstvo/plavayut-oboroty-vaz-2114.html