VAZ 2115 stalls at idle - what to do, repairs, reasons

MAIN REASONS WHEN THE CAR STALLS AT IDLE SPEED

A VAZ car stalls at idle quite often when there is a malfunction of sensors, components or parts. It is also possible that the car's lines, filters, and various elements in the system become contaminated.

If any of the VAZ models, including the Chevrolet Niva, stalls at idle, then first of all you should pay close attention to the quality of gasoline. Problems with starting or incorrect operation of the engine after the next refueling may arise precisely because of low-quality fuel. In this case, it is worth draining all the gasoline and changing the fuel filter.

When these steps do not help, you need to check the spark plugs in the car. The working part is distinguished by the light gray color of the central electrode. The carbon deposits on the candles should be light brown. In case of any deviations from the norm, we can assume that the part has failed. Replace the spark plugs and try to start the engine again.

A faulty ignition module can also cause problems with starting the engine. Knowledge of at least a minimum of electrical engineering will allow you to check its performance. But it is better to contact a specialized service.

A generator malfunction leads to a decrease in the bot network voltage. In this case, all vehicle systems are powered by the battery. This is also the reason why a car stalls at idle when hot. On the instrument panel indicators of some models you can see a decrease in the mains voltage. Here it is worth diagnosing the generator for the presence of a breakdown.

What are the reasons leading to incorrect engine operation:

• The throttle valve is broken or dirty.
• Contamination in the crankcase ventilation.
• Malfunction of the throttle position sensor or mass fuel flow sensor, other indicators.
• Faulty or clogged parts of the idle air regulator.
• Carburetor channels are clogged with sediment.
• Fuel nozzle clogged.
• Debris or errors in the operation of injection nozzles.
• Faulty or dirty fuel pump filter mesh.
• Fuel filter is dirty.

Regulator XX

You will be interested in: Van "Lada-Largus": dimensions of the cargo compartment, technical characteristics, operating features, advantages and disadvantages of the car

This is one of the fairly common reasons why the VAZ 2114 injector stalls at idle. Regulators called XX or IXX are special devices that help control engine speed at idle. For the power unit to function properly, some air must pass inside. It, in turn, is detected by the mass air flow sensor, and the fuel controller supplies fuel based on sensor readings. Also, the number of revolutions is controlled by the DPKV. But it is the XX regulator that is responsible for the air supply, regardless of the operation of the air valve.

If an IAC system is installed in the car, then, as a rule, the car owner does not need to warm up the engine for a long time before starting to drive. However, this type of regulator is not capable of self-diagnosis. Therefore, if it fails, the VDO VAZ 2114 dashboard does not notify the driver that this unit needs to be checked.

OPTIONS FOR TROUBLESHOOTING

It is clear that if any emergency situations arise with the motor, it is advisable to contact a specialized service. However, this procedure is not always possible. Therefore, it is worth knowing how to independently diagnose the main systems and key parts.

THROTTLE VALVE AND ASSEMBLY

When the speed drops at idle and the car stalls, you need to pay close attention to the details of the throttle assembly. Long-term operation of the car on low-quality fuel and untimely maintenance of the air filter can lead to malfunctions of the throttle valve. It periodically jams if debris gets into the equipment.

Throttle valve VAZ 2112

The problem can be solved by cleaning the system. The throttle is cleaned using carburetor cleaners. Using a compressor, you need to blow out the damper under the pressure of compressed air. It is not recommended to touch the screws located inside and on the side. If cleaning does not correct the situation, the device must be replaced. This operation is not particularly difficult.

CRANKCASE FAILURE

There is an oil trap in the crankcase ventilation system of the engine. Its contamination can also lead to interruptions in engine operation. Crankcase gases do not allow the engine to function normally, the speed fluctuates, the internal combustion engine stalls.

SENSORS

If a gasoline car stalls at idle, then one of the sensors is likely to break. In injection cars with an electronic engine control system, the engine usually starts normally, but then it stops working. It's worth checking here:

• Electronic car indicators;
• DRХХ – device that regulates idle speed;
• Air flow meter (air intake in the carburetor);
• Sensor indicating the position of the throttle curtain.

Electronic control unit in VAZ 2114

Interruptions in the operation of any sensors immediately affect the behavior of the electronics - errors appear in the car control unit. The “brains” of the machine receive unreliable information. It is not transmitted correctly to the engine. It starts working with parameters that do not correspond to reality. Self-testing of this device is not possible. You need to contact a professional for service.

Diagnostics of mass air flow sensor

The idle air control device is usually to blame for engine malfunction when the car idles poorly. But you pressed the gas pedal and the engine started. In the latest VAZ modifications, error information appears on the instrument panel.

When diagnosing, you must use a multimeter. If a part is faulty, it is recommended to replace it with a new one. All sensors are reasonably priced. It is better to start checking with parts that have a simpler design. Then gradually move on to complex devices. We must not forget that the problem may lie not only in the sensors themselves. It is also necessary to check the wiring to them and the presence of stable contact.

CARBURETOR

If the VAZ carburetor stalls at idle speed, then the jets may become clogged. Low-quality gasoline, deposits from the gas tank, contain small particles of debris. They can easily disrupt the operation of the fuel injection system. It is worth replacing the filter in front of the carburetor and cleaning the device itself. The dispensing part is cleaned using a cleaning solvent, which is sold in aerosol cans. Another reason is often a prolonged lack of carburetor adjustment.

In a mechanical fuel pump of carburetor cars, the filter mesh may be clogged with dirt. This reduces the performance of the device. Wear of the membrane and its destruction often leads to clogged carburetor channels.

INJECTOR

A situation that often arises is that various Lada models, as well as the VAZ 2110 injector stalls at idle. It is necessary to check the fuel pump strainer for clogging. This is a common problem with injection machines. It is better to immediately replace the part with a working one.

FILTERS PROBLEM

If the VAZ 2112 stalls at idle, then the fuel filter may be dirty. This also applies to other models of the concern. Generally, it is not practical to clean it. The part must be replaced. The same should be done with a dirty air filter. Low throughput leads to the fact that the air-fuel mixture simply floods the spark plugs.

Self-checking will not always lead to a positive result. It is often more practical to identify the cause of unstable operation of the internal combustion engine at a car service center. It will cost more, but specialized diagnostics will prevent more serious damage to the car.

Methods for eliminating floating engine speeds

When you begin to find and eliminate the causes of unstable engine idling, you first need to check:

1. Condition of the air filter and spark plugs. In case of critical contamination, they must be replaced.
2. Integrity of insulation of high-voltage cables. If damage is found, they must be replaced.

It is recommended to ensure that there are no leaks at the junction of the intake manifold and the engine cylinders. To do this, with the engine running, you must constantly spray all joints at the joints with carburetor cleaner or other flammable liquid. If atmospheric air gets in there, the car engine clicks sharply because when a damaged gasket or cap is found, the element is replaced.

Checking the tightness of the intake manifold (video guide)

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

Solenoid valve diagnostics

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

1. Unplug the power cord.
2. Start the engine to warm up.
3. Connect the wire. If you do not hear a clear click, the part must be replaced.

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

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 improper operation of the carburetor. The device is adjusted by turning the screws according to the quality and quantity of fuel.

Is the EGR system on the injector working?

The "floating" speed can be caused by a stuck exhaust gas recirculation (EGR) valve, which is installed in the exhaust manifold. It is necessary to periodically remove dirt from the valve seat and valve seat using an aerosol to clean the carburetor without allowing liquid to contact the sensor diaphragm.

Make sure the valve seat is clean

Attention! If disk cleaning fails, the device must be replaced.

Is the idle air control valve working correctly?

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

1. Turn off the ignition.
2. Disconnect the connection block.
3. We measure the resistance on contacts A - B and C - D of the device. Optimal meter readings are in the range from 40 to 80 ohms.
4. We repeat the measurements with contacts B - C and A - D. In this case, the multimeter should show “infinity” or an open circuit.

Any violations of the normal resistance values ​​indicate a malfunction of the regulator. IAC failure is a common cause of floating engine idle and should be replaced if a fault is detected. Before you begin disassembling the part, you must disconnect the negative cable 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 the ignition is turned off (no need to start the engine).

IAC failure is a common cause of engine speed fluctuations.

Attention! If the battery is not disconnected before disassembling the device, the ECU will not calibrate the IAC.

Serviceability of the mass air flow sensor

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

1. Turn off the engine and turn on the ignition.
2. We measure the voltage at the connector between the contacts of the green and yellow wires. The multimeter reading should be between 0.99 and 1.02 V.

The device can be cleaned by “blowing” with carburetor cleaning spray

Attention! The device can be disassembled and cleaned using carburetor spray, but this does not always help. In the event of a critical failure, the part will need to be replaced.

Video: Checking the mass air flow sensor

Cleanliness of the damper assembly

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

To clean the part, it must be disassembled

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 out to it.

Video: How to clean the throttle body

Is it possible to diagnose DPKV and DSA?

The failure of the DPKV and DSA (Hall sensor) is indicated by the Check Engine indicator, which lights up on the car’s dashboard. Control of these devices is possible only with the help of special devices (oscilloscopes). You can first check the integrity of the wiring - if it is damaged, 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 gearshift speedometer drive mechanism.

For a more detailed understanding of methods for identifying faults associated with engine malfunction at idle, it is recommended to watch the following video.

Video: Computer diagnostics of VAZ 2114 idle problems

The following discusses the main steps to rid a car of floating engine speeds at idle. Remember: if performing these operations autonomously does not lead to a positive result, you will need to contact a service station with the necessary diagnostic equipment and qualified repair technicians.

VAZ 2115 stalls at idle - reason

• Wash the throttle assembly, especially pay attention to the channels xx, where the low speed regulator is located. Wash the IAC itself. Check the TPS sensor. Look for air leaks, check the mass air flow sensor. Check coolant temperature sensor.
• I once changed about five TPS, from the cheapest to the most expensive, and everyone behaved differently. They have a little travel to adjust, try making the revs a little higher.
• Well, suction cannot be ruled out throughout the entire intake tract. Do you have a recirculation valve? The tube comes to it from the receiver, try turning it off.
• With a non-working automatic transmission, the car will not start at all, much less go anywhere. Moreover, the ECU constantly monitors its operation and, if something happens, will turn on the meat grinder on the panel for you.
• According to check: when the ignition is on, there should be 0.7 volts between ground and the TPS slider, and 4 volts with the throttle fully open.
• I don’t know whether there are many or few defects, but I came across two in a row through which air was sucked in the place where the rivets were, both with a hologram and with an authentication code. I returned one, the second, because I took it apart, naturally did not return it, but covered the crack with nail polish.
• But you may have another reason; I haven’t tried it with the connector removed. Just in case, check it for leaks.
• No, there is no relay, there is a stepper motor, controlled by the ECU.
• The ECU issues control signals to the stepper motor, in which direction and how many steps to turn the motor rotor, and it, in turn, moves the rod, opening or closing the xx channel. Operating a ball motor is not like operating a regular motor. Or do you think that the ECU may not be giving a signal? Then you need to diagnose or borrow a BC, it will be able to show the operation of the IAC.

In this article we will talk about such an unpleasant problem as engine stopping and poor starting. Let's look at the main reasons why the engine stalls at idle and while driving. In addition, we will talk about why the engine does not start when hot, as well as options for solving each of the problems described above.

Common reasons why the idle stalls:

1. The most common one is the idle speed regulator (sensor), which is directly related to engine idle speed. It’s quite easy to check whether there is a breakdown. If the car does not start when you turn the starter, operate the gas pedal, the engine should start. If the revs start to fluctuate immediately after you take your foot off the pedal, there is a 99% chance that the reason is in the idle speed control. The solution is to replace the idle air control; this will take VAZ owners a minimum of time.

2. The second probable reason why the engine stalls at idle is problems with the throttle valve. This problem can be cured by simply cleaning the throttle valve.

3. If after cleaning the problem persists, we assume that the reason why the engine stalls at idle may be the TPS (throttle position sensor). The problem is solved by replacing the TPS; the procedure is not complicated and can actually be done with your own hands.

There are often cases when the engine stalls while driving, as they say, out of the blue. The most probable and most common reasons why this may happen will be listed below.

Idle speed control

On VAZ models with an engine of 8 or 16 valves and on foreign cars, the power unit starts up, then stalls due to IAC. The wrong name is idle speed sensor, the correct name is regulator.

The device monitors engine speed and maintains it. At idle, the engine stops working, or uneven speed is observed - the part is faulty. When the gearbox is switched to neutral, the engine stalls - it is worth changing the regulator.

Sometimes similar symptoms are observed when the throttle valve is dirty. It is recommended to clean it first.

The engine stops while running - reasons

1. Poor quality fuel is the first thing that comes to mind for most of us, and besides, this is where we need to start looking for the reason for the engine stopping while driving. You will be “lucky” if this happens immediately after refueling, in which case you can confidently say that the problem is in the fuel. Treated by draining the fuel and replacing the fuel filter.

2. Candles. As a rule, suspicion most often falls on them, after bad fuel, of course. Everything is simple here - unscrew the spark plugs and check their condition, replace the spark plugs if necessary.

3. Fuel filter. A seriously clogged filter can cause an interruption in fuel supply, causing you to rev the gas and the engine to stall while driving. To eliminate the problem, simply replace the fuel filter.

4. Air filter. Everything is the same as with the fuel, if it is clogged, then no air comes in, therefore the fuel-air mixture comes out over-enriched and the spark plugs simply flood. In addition, due to lack of air, the engine will choke, that is, the power will drop, and the combustion process of the mixture in the cylinders will not be able to take place, and eventually the engine will stall. To eliminate this problem, simply replace the air filter.

5. A faulty fuel pump is the second “suspect.” If your fuel pump is not working properly, then the car will behave like this, stalling while driving, or the engine will not start at all. The problem can be solved by checking the pump, repairing it, or completely replacing the fuel pump.

6. Battery. Oxidation of the battery terminals or poor contact can cause the engine to stall. Check the terminals, clean them if necessary or replace the battery.

7. If the engine stalls while driving and no longer starts, the generator may also be the cause. A failed generator does not charge; as a result, the car’s on-board network is powered exclusively by the battery, and as we know, it will not last long. As a result, you, unaware that the car is running on the battery, continue driving until it is completely discharged. It can be treated by charging the battery and repairing the generator.

Do-it-yourself troubleshooting

Many of the defects from the list above can be eliminated yourself in a few minutes. Identification will take much longer.

Diagnostics of mass air flow sensor and IAC

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

Failure of these sensors will result in increased fuel consumption, and a broken rod will affect the speedometer needle, which will remain stationary until the problem is corrected.

Diagnosis of DPCV

Crankshaft sensor position

Failure of the crankshaft position sensor will negatively affect the operation of the engine as a whole. Loss of synchronization between the engine and the injection system prevents the vehicle from starting. You can accurately determine the condition of the sensor only using a multimeter.

To do this, follow these steps:

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

Checking DPKV with a multimeter

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 ECU to increase or decrease the air supply to the combustion chamber. Diagnostics is carried out with a multimeter on a hot engine. The procedure is as follows:

• One core of the device clings to the ground, the second to the sensor output;
• When recharging the engine, the multimeter reading should be between 0.2 and 0.9 V;

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

Video about checking the lambda probe

Speed ​​sensor diagnostics

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 housing and inside the air filter requires immediate replacement.

As its permeability decreases, the engine lacks air in the combustion chambers. Due to this, the fuel does not burn completely, and the rest is thrown out and burned in the exhaust pipe, which can burn out as a result.

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

Oil deposits on spark plugs

Important! If the car has been operated with this malfunction, it is recommended to replace the spark plugs, as due to high fuel consumption they will be filled.

Checking wires

The easiest way to diagnose high-voltage cables is in the dark, just open the hood. If the wire is “pierced”, a spark will be visible beating off to the side.

Visual inspection of high voltage cables

Another reason hiding in this place is poor contact, the appearance of oxide. To do this, you need to visually evaluate the ends of the wire (white, blue or green plate), which must be thoroughly cleaned, washed with a wedge (WD-40), dried and reinstalled.

Healthy! Don't forget the term "metal fatigue". This means conductivity deteriorates due to the contacts being in constant voltage mode. Therefore, high-voltage cables must be periodically replaced with new ones (their specific duration 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 is due to wear of the filling. This is not difficult to identify. To do this, you will need regular carburetor cleaner. With the engine running, you need to spray all connections and places that make you suspicious with an aerosol can (microcracks in the commutator body itself are possible).

Checking the intake manifold

If the engine runs unchanged, this is not the cause of the malfunction. If the engine speed increases and the engine clicks, replace the manifold or intake manifold gasket.

Healthy! There is no need to weld or glue the intake manifold. The patch will not last long, and after a while the problem will return.

Cleaning the throttle valve

The throttle valve must be regularly cleaned of carbon deposits.

Due to the accumulation of large amounts of carbon deposits, the throttle valve may not be in the correct position. To fix this, you will need to remove the throttle assembly and clean it with a vadashka or carburetor cleaner, and then reinstall it.

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

Fluctuations in engine speed are a common problem in injection engines. The fact is that the ECU, when receiving an incorrect signal from a non-functioning sensor, mistakenly opens the air supply solenoid valve. TPS reports that this cannot happen and the engine has already exited heat mode. It was at this time that the idle speed of the VAZ-2114 began to fluctuate. Therefore, if this problem appears on your machine, do not worry. If the cause is identified and eliminated in a timely manner, there is nothing to worry about.

Why does the engine stall when it is hot, and a well-warmed engine does not start?

1. The first possible reason is the carburetor. During movement, a large amount of air passes through it, due to which the carburetor is seriously cooled, at the same time the fuel that passes through it is also cooled. As a result, the carburetor temperature is several times lower than the engine temperature. Because of this feature, problems arise; after a long journey, you turn off the engine and make a short stop, at which time the carburetor begins to get very hot from the hot engine body. The remaining gasoline in the float chamber begins to evaporate from the high temperature, filling the voids - the air filter, the intake manifold and the carburetor itself. Air pockets form, and not a drop of fuel remains in the float chamber.

The solution to the problem is quite simple - press the gas pedal halfway several times and try to start the engine. This will make the mixture leaner and release excess evaporation. It should be noted that problems with hot starting can also be due to a similar problem, only due to the fault of the fuel pump or fuel line. This usually happens in hot weather when air pockets form from evaporation in the fuel system or pump, preventing fuel from entering the carburetor.

2. The second possible reason for the strange behavior of a warm engine is problems with the starter. Make sure that when you try to start the engine, the starter turns and does not just click or not respond at all. If this is the case and one of the above options is confirmed. the starter needs to be checked. If you are on the road, then the check can be reduced to a basic check of the starter power wire or other visual operations. If you get home, perform a detailed check of the starter according to these instructions. In case of malfunction, repair or replace it.

3. Alternatively, the reason when the engine does not start when hot may be a dead battery due to the reason described above, when the generator did not charge and the battery was completely dead.

Well, it seems like you didn’t miss anything!? That's all for today, we hope the article will help, tell you the cause of the breakdown and help you solve your problem. If you know other reasons, as well as ways to solve them, you can supplement the article using the comment form. Thank you for your attention.

The cause of a stalled engine is the spark plugs

In 50% of cases, the problem is due to the fact that the spark plugs simply do not produce a spark. This failure occurs as a result of 3 reasons:

• contacts become clogged;
• plaque forms along the entire contour of the candle;
• malfunction when supplying voltage to the spark plug.

However, the most popular is still black carbon deposits on the spark plugs, which prevents the spark from appearing or causes it to work periodically.

Tip: if the spark plug set malfunctions, you will hear a “triple” sound that is uncharacteristic of the engine. In this case, the car will jerk strongly while moving. As a result, the engine will either stall on its own, or you will need to turn it off and turn the ignition on again.

If you see dirt on the surface of the contacts, this indicates the need to replace a low-quality type of fuel or check the serviceability of the oil supply systems. It is the oil supply adjustment sensors that can splash the spark plugs with it if there is a problem. Also, oil that appears on a set of spark plugs may indicate serious damage to components in the engine cylinders. Be sure to check the engine at a car service center. Otherwise, further operation may lead to expensive replacement of jet rods and even the entire set of pistons.

If you systematically use low-quality gasoline samples, you may find a red-brown coating on the contour of the spark plug. In this case, cleaning will not help - it is better to immediately replace the entire set after a new refill. If you find that the car periodically turns off at full speed, but starts easily even with clean spark plugs, then the problem lies in the electrical wiring.

The cause of a stalled engine is a power supply failure

In this type of problem, 3 reasons may be involved:

• Poor contact with the terminals of the new battery;
• Detection of poor contact or breakdown along the entire length of high-voltage wires;
• The appearance of malfunctions in the generator or ignition coil system of the car.

If the problem lies in damp high-voltage wires, then it is best to replace them completely along with the battery contacts. If the terminals make poor contact, you need to carefully clean them with sandpaper and try to reconnect them. If the generator is found to be inoperable, the problem usually boils down to problems in the following parts:

1. Broken timing belt;
2. There is a malfunction inside the housing of the unit itself.

A problem with the generator is easily detected when the corresponding indicator on the dashboard turns on. In addition, if there is insufficient energy supply, the backlight of the on-board panel will gradually fade, and a set of other diagnostic sensors will show incorrect values.

Advice: if when you press the gas the car jerks, then stalls and cannot start, then the problem is related to the failure of the ignition coils. It is best to replace these parts in a car service using special equipment.

From the list of reasons that are directly related to the car engine, you need to move on to problems that arise in the fuel and air supply systems, as well as malfunctions of components responsible for exhaust gas removal.

Ignition coil

Throttle valve

The cause of the breakdown is contamination of the throttle valve. The car's response to the gas pedal is late, the speed is uneven, the engine stalls, the part needs to be washed. Necessary:

1. Buy a special product at a car store.
2. Remove the damper.
3. Rinse thoroughly.
4. Install back.

If these steps do not help, the problem is related to the power supply (see below).

On foreign-made cars, the throttle damper could fail. Then, when you release the gas, the engine will stall. The part is responsible for returning the damper to its normal position, eliminating dips.

To check the damper you need:

1. Warm up the engine to operating temperature.
2. Open the valve yourself.
3. Let go quickly.

The part should return almost to the limit, pause and not reach the end so quickly. If no deceleration is observed, the damper is faulty. It needs to be replaced, repair is impossible.

Fuel supply faults

It is quite easy to find out that the car stalls while driving due to the engine being “choked” with the fuel mixture - during a long drive you will find that the signal of the sensor responsible for this function is constantly on.

Here the problem lies in low-quality fuel, which does not quickly “ignite” from the spark of the candles. It can also be caused by gasoline not meeting the requirements for the octane number specified in the vehicle specifications. If there are problems with fuel, the gas pedal will be pressed all the way, and the car will not begin to gain speed. In addition, the car will periodically stall when the clutch is engaged.

Another symptom indicating problems with fuel is the appearance of problems with the car after refueling. The problem is characterized by a rapid drop in engine power at full speed, as well as when constantly changing gears. The way out of the situation is to completely drain the bad fuel mixture, wash the engine and all the fuel system pipes.

Also, the car will constantly stall if there is an interruption in the supply of the fuel mixture. This may be due to contamination in the following system components:

• Dirt in the fuel filter;
• Problems with injector nozzles;
• Dirty throttle valves;
• Fuel pump power failure.

The main symptom of a malfunction of these parts is that there will be a gradual drop in the power of the car’s engine, after which the car will stall even after sharply pressing the gas pedal. If you do not release the clutch carefully when changing gears, this will also cause the engine to stall.

The contamination of the fuel filter and fuel pump can be judged by the unstable operation of the machine even during idling and during rapid braking (when the supply of the fuel mixture decreases). And if the performance of fuel filters can be easily established during an external inspection and eliminated by replacing them, then to detect other causes, you need a full-fledged computer diagnostics, which can only be carried out in a car service center.

Another reason for a stalled car associated with the operation of the fuel pump is boiling gasoline in the fuel pump. This happens mainly in hot weather when the car is moving slowly or standing on the highway in traffic jams. The car will start to stall while driving, but when you turn on the idle speed and press the clutch, it will start again.

If boiling occurs, it is better to stand in a traffic jam with the engine turned off and gradually cool the car. After 5-10 minutes, the car's operation will be stable again.

Advice: if you recently did a wheel alignment with your own hands on a VAZ-2107, then to cool the car, proceed as follows - throw a piece of cloth made of dense material over the fuel pump body, which you first moisten with cold water.

How to find the cause of the problem

If the speed of the VAZ 2114 drops, you need to comprehensively diagnose the functioning of the injection system on your car, which can be done in your garage if you have a little experience and appropriate instructions. In this case, those “fourteeners” that were equipped from the factory with a dashboard from the German manufacturer VDO have an important advantage, since it, in comparison with the analogue from Schetmash, is equipped with a self-diagnosis mode.

To carry out this procedure, you will need to perform a few simple steps:

• After turning off the engine, you need to keep the odometer button pressed for three to five seconds;
• Having turned the engine ignition to the first position, the button must be released;
• arrows should appear on the display, which is a signal of normal operation, then the button must be pressed the first time (displaying the firmware version) and the second time - after this probable errors in the ECU will be shown;
• To reset the error message, you will need to hold the button until a zero appears on the display.

After reading the manual, you can find out what errors shown on the screen may be associated with the fact that the speed constantly drops when the gas is released on the VAZ 2114.

So, it could be one of the following situations:

• code 1 – controller error;
• code 14/15 – coolant sensor error;
• code 22/23 – throttle position sensor error;
• code 33/34 – mass air flow sensor error;
• code 42 – faulty ignition;
• code 44 – fuel mixture is lean or too rich.

The owner of a VAZ 2114 should remember a specific feature of the self-diagnosis mode on his car: if there are several errors, the computer sums their codes arithmetically, which can be misleading. This can be indicated by a logical discrepancy between the displayed code and the actual problems.

To be completely sure, you will either need to take the car to a service center and pay for its inspection, or buy a diagnostic scanner yourself, which is not that expensive. Another option is if you have the same VAZ model (fully operational), one by one, remove it from it and install potentially vulnerable sensors on your car, using the method of elimination to find the problem.

Malfunctions in the air mixture supply system

Here the problem lies either in a clogged air filter or in the failure of the regulator responsible for idling the car. In this case, your car will stall all the time when you gain speed or when you release the gas when you release the accelerator.

To solve the problem, remove and inspect the air filter. If there is serious contamination or chips, replace it. To diagnose and replace the idle speed regulator, you will need the help of qualified car service employees.

Car exhaust system problem

The engine may also stall if the tubes responsible for removing gases are malfunctioning. At full speed, the car will quickly begin to “choke”, and pressing the gas pedal completely stops the engine. Malfunctions in the operation of the exhaust pipe system in 90% of cases are caused by contamination and clogging of the muffler. However, the catalyst may also fail.

In the first case, carefully clean the muffler and remove foreign objects from there. If there are problems with the catalyst, conduct a complete diagnosis of the exhaust system and replace this element.

What to do if cars with automatic transmission stall?

If your vehicle has an automatic transmission, then the problem should be found in the electrical supply. If you abruptly switch from one gear to another, or while switching gears while braking, the settings may be distorted, and the on-board computer will receive a signal to turn off the engine.

Also, models with automatic transmission may stall due to malfunctions of the hydrodynamic transformers of the gearbox. This problem mainly manifests itself during acceleration and requires urgent intervention from car service specialists.

Sources

• vaz-russia.com/vse-ob/pochemu-glohnet-mashina-na-hodu.html
• o-ladagranta.ru/vaz-2115-glohnet-na-holostyh-oborotah-prichina/
• nadomkrat.ru/innteresnoe/pochemu-mashina-vaz-glohnet-na-holostyh-oborotah