Hello! Please help, a car with an automatic transmission has stalled and will no longer start. What to do? (Mumin Kurbonov)

Mumin, good afternoon. Automatic transmission- the unit is quite complex and demanding in terms of operation and maintenance. Therefore, one wrong action can cause the engine to stall and not start. We will try to help you with your question.

[ To uncover]

Why does a car with automatic transmission stall?

There may be several reasons for this behavior of the car. Let’s say right away that only high-quality diagnostics will help accurately identify a breakdown, and the information below is only a theory, since we have not seen your car and do not know under what circumstances it stalls.

So, the most common reasons:

1. Very low quality fuel. On low quality gasoline, diesel or gas, the car may not run at all. In practice, this problem usually manifests itself among those motorists who install gas installations and are filled with low-quality gas. You need to get rid of low-quality fuel and fill in new one. If your car is equipped with gas equipment, then you also need to check the gas filter. Filter performance fuel cells It should be checked on both petrol and diesel cars.
2. Regulator failure mass flow air. We recommend checking the functionality of the device, as well as its connection diagram; there may be a break or short circuit in the wiring.
3. Position sensor malfunction crankshaft. With such a problem, the car may stall while driving. As in the previous case, it is necessary to check the functionality of the regulator, as well as its wiring.
4. If the vehicle stalls while braking, the breakdown may well be related to the vacuum brake booster. We recommend diagnosing the mechanism only if you know how to do everything correctly.
5. Crowded throttle valve. As practice shows, it is the throttle that in most cases causes the car to fail to start.
6. Naturally, you should also check the fuel level in the tank.

In any case, if you do not know how to diagnose a transmission, then you need to seek help from specialists. Using a computer check, a professional will diagnose the unit and identify all possible malfunctions in the form of codes that will need to be deciphered. If necessary, it will be possible to check the operation of the engine itself.

Video “Features of operating an automatic transmission”

Everything about operating a car with automatic transmission is on video (author - Vladimir Grechaninov).

avtozam.com

Stalls when you turn on D or R

There have been several cases in practice when cars stalled when the automatic transmission selector was placed in the drive or reverse. At the same time, everything worked perfectly in neutral and parking. The malfunction was also periodic in nature - the car sometimes stalled when stopping in the drive selector mode. This malfunction appeared on the Santa Fe (CM) and ix35, equipped with 6 step box machine. In all cases, the valve body was to blame. In an automatic transmission, only the torque converter (donut) can turn off the engine. To diagnose, you need to understand how it works. On idle speed it transmits a small torque to the gearbox, so the engine does not stall. To save fuel, modern torque converters are locked - friction disc built inside the torque converter. The lock on most cars starts working only at higher speeds(4,5,6 speed). If you enable the lock on standing car in D mode, it is equivalent to throwing the clutch on mechanical box transmissions. Possible reasons: 1. Electrical part. The torque converter lock-up is activated using electronic unit automatic transmission control To exclude the wiring and automatic transmission control unit from suspicion, simply disconnect the connector from the gearbox. Gearbox without electrical supply will go to emergency mode. When you switch to D mode, 4th gear is engaged. My car being diagnosed continued to stall and I realized that there was a breakdown inside the automatic transmission. In general, diagnostics can be carried out using error code P0741.2. Checking the hydraulic part. It is necessary to measure the torque converter lockup control pressure. These are DA and DR ports.

It is advisable to use two pressure gauges, but you can get by with one. You can see what should happen in the documentation for error P0741:

As you can see DR = 7.3 DA = 4.4. Here important point that DR is greater than DA and, therefore, the locking disk will not be pressed against the fluid coupling body. When I took measurements, I received the value that, on the contrary, DA is greater than DR. and therefore the lock was enabled. The following figure clearly shows how the blocking works.

Based on the information received, I removed the hydraulic unit and washed it. Special attention you need to pay attention when washing the valve body solenoid valve blocking. You can apply voltage briefly to click and rinse. The hydraulic unit must be completely disassembled and washed diesel fuel. Nothing else can be used for cleaning. You need to be extremely careful when tightening the valve body bolts. When re-stretching, problems also arise later.

Ideally, of course, the filter would be changed, but to do this you need to remove the box and disassemble it.

There is still a possibility of destruction of the torque converter inside, but this is extremely unlikely and I have not encountered such a defect.

Washing the hydraulic unit

www.diagnoz-auto.ru

Does the car stall while driving? All causes and consequences!

Most drivers don't know why their car stalls while driving. The problem is quite common and very annoying, considering that the car can stall at any time, especially if the driver has already entered a busy road.

This problem in such a situation hinders both the owner of the car and the participants traffic. From the outside it may seem that the driver simply has not learned proper driving.

If such a malfunction occurred only a few times and then disappeared without a trace, everything is not so bad. But if the engine tends to constantly stall while driving, this is already serious problem. Do not forget that such sudden stops are dangerous on the roads; a more inexperienced driver may simply not have time to stop, which will lead to an accident.

Main reasons

The engine stalls:

1. At the moment of gear shifting, as well as at neutral speed.
2. While pressing the gas.
3. When the engine speed is reduced.

It is worth noting that the injection and carburetor engine The causes of problems are usually different. Another important factor is at what time the engine stalls: cold or hot.

The reasons may be the following:

1. Not high quality gasoline. Engine malfunction may occur due to refueling low quality fuel. Any knowledgeable driver will reflect on when and where the last refueling was made. There are cases when, after refueling at another station or with a different brand of fuel, the car begins to stall while driving.
2. Faulty spark plugs ignition If, while driving, along with a sudden stop of the engine, the car makes sudden movements in the form of jerks and starts poorly, then the reason is in the spark plugs.
3. Fuel filter. Another cause of malfunction is a dirty fuel filter. Over time when passing fuel mixture the filter becomes clogged with waste. If there is a fault in it, it should be replaced.
4. Why the car stalls while driving is due to a faulty fuel pump. With this malfunction, fuel cannot flow normally into the aggregate system; in this case, you simply need to replace the pump.
5. The battery must be kept clean, the terminals must be cleaned on time, since without proper care they either oxidize or become clogged.
6. The generator is very serious and important detail car. With him malfunction all energy consumption falls on the battery, which, without the support of a generator, can very quickly discharge, and the car will not just stall, but will stand somewhere in the middle of the road until it receives a charge.
7. Air filter. When it becomes contaminated, a failure occurs in the timely enrichment of the fuel mixture. Very often car owners forget about timely change filter, which leads to malfunctions and breakdowns.
8. Optional equipment. With a large number of installed additional parts that provide comfort to the owner, a huge amount of energy is consumed. The car starts to stall because it doesn't receive sufficient quantity charge for normal operation.

In the case of a stalled engine at the very beginning of operation, when the car has not yet warmed up and the engine is not hot, the following problems may occur:

1. Feed system is faulty air-fuel mixture.
2. The automatic throttle is faulty or the adjustment is incorrect.
3. Thermostat malfunction - if this part breaks down, the engine will not be able to warm up normally and give the required speed.
4. Fuel injectors heavily polluted.
5. The coolant sensor is broken.

There can be a lot of reasons for a breakdown; special diagnostics, which are carried out only in car services, can correctly determine the cause. Only after this should you begin repairing the machine. Once you find out what the problem is, it is easier and faster to repair the car.

For cars with an automatic transmission, the automatic transmission sensor may light up while driving, and then the car stalls.

In this case, the automatic transmission should be diagnosed. The repair of such a malfunction should be entrusted to specialists. Usually, in car services, immediately after diagnostics, at the driver’s request, the auto mechanic disassembles and sorts out the box and fixes the problems. Usually the box does not need to be completely replaced.

Injection engines

If a car with an injection engine stalls while driving, then there may be several problems of this kind:

1. The oxygen enrichment system for the fuel mixture is faulty.
2. Broken oxygen sensor.
3. Intake manifold malfunctions.
4. Fuel injectors are partially or completely dirty.
5. The cooling system of the unit is broken.

If the owner himself is not sure of the cause of the breakdown, the same diagnostics are needed, after which repairs are already carried out.

You can describe some of the reasons in more detail, but do not forget that there can be a lot of them, and they are all different - it depends on the make of the car, the country of origin, the type of engine, etc.

Spark plug

According to statistics, the reason for a large number of cases of stalled engines is the spark plugs: they simply do not produce a spark. The spark plugs may be dirty, have deposits on them, or there may be a malfunction when applying voltage directly to the spark plug.

In any case, if the breakdown is caused by spark plugs, the car will jerk while driving. For example, if there is dirt on the spark plug contacts, then the problem is the low quality of the fuel mixture or malfunctioning oil supply systems, or oil splashes are found on the spark plugs, which indicates that a serious breakdown has occurred in the component cylinders of the engine. For precise definition You need a full inspection of the engine at a car service center.

If you delay repairs, you can get a lot of problems, since you will have to replace the entire set of pistons.

If a red-brown coating is found on the spark plugs, then the problem is due to constant use. low quality gasoline. It is worth replacing the spark plugs with new ones, changing the gas station with higher quality gasoline. But if this does not help, then you need to look for a wiring fault.

In the case of power supply, the following malfunctions occur:

1. When installing a new battery, the terminals are poorly secured.
2. Breakdown of high-voltage wiring.
3. Faulty generator.

In case of malfunction, high-voltage wires are completely replaced. For good contact The battery and terminals need to be cleaned with sandpaper. If the malfunction is in the generator, then it may occur in the event of a broken timing belt, as well as a malfunction within the unit itself. Generator breakdowns are easier to detect, since dashboard There is special icon, which lights up in case of any deviations.

Additionally

1. Brake malfunction. In this case, the design is usually faulty vacuum booster. The problem comes to light during hard braking - as a result, the engine stalls (i.e. slowly stalls by itself). Usually the entire amplifier is replaced or its adjustment is made.
2. Exhaust system. The exhaust system may be contaminated, and after such contamination the car simply cannot “spit out” all the accumulated gas and begins to “choke.” It is necessary to clean the muffler; if the problem is not only contamination, but also a breakdown of the catalyst, the exhaust system must be completely replaced.

Is it due to poor fuel quality? Often the problem is precisely the fuel of low quality, or that does not correspond to the brand of car the driver is driving.

Needs to be monitored carefully gas stations.

Fuel tends to pollute and contribute to rapid wear many vital parts for the car.

When using low-quality mixtures, the following occurs:

1. Rapid pollution fuel filter.
2. Malfunctions appear injection nozzles.
3. Throttle valves become dirty quickly.
4. Work gets lost fuel pump.

Most main indicator malfunctions are a gradual decrease in engine power, as a result of which the car will stall even when the gas pedal is sharply pressed. You can identify many problems yourself without spending extra money. cash to pay for the services of the service center, but if external inspection and subsequent repairs fuel systems the problem has not been resolved, you will have to carry out computer diagnostics to more fully and deeply identify the problems.

If your car has an automatic transmission and the car periodically stalls while driving, then the problem is usually in the power supply.

When the transmission changes gear, the computer receives a notification that some part is faulty and decides to immediately turn off the engine. Problems with this type of car need to be resolved as quickly as possible, in mandatory Repairs should only be carried out by specialists. Personal intervention will lead to more bigger problem.

So, the car stalled while driving, what to do next:

1. Using the inertia of movement, push the car off the roadway, no matter whether it is a city road or a highway.
2. Turn on Emergency Signal.
3. Must be installed emergency sign behind the car: there are plenty of fans of high-speed driving everywhere, you shouldn’t create emergency situation.
4. Put the car on the handbrake.

Development options further developments 2:

1. Do the repairs yourself.
2. Find a way to transport the car to the service.

In order to avoid such unpleasant and unexpected moments when the car stalls while driving, you need to follow simple rules:

1. Carry out vehicle diagnostics as often as possible service center.
2. Carry out preventive maintenance and inspection of the machine yourself.
3. Monitor the condition of parts and replace them in a timely manner so that the machine does not break down in unexpected places.

You should always have a tool with you to repair minor damage, as well as a can of gasoline to avoid stopping due to its absence.

Hello! Please help, a car with an automatic transmission has stalled and will no longer start. What to do? (Mumin Kurbonov)

Mumin, good afternoon. An automatic transmission is a rather complex and demanding unit in terms of operation and maintenance. Therefore, one wrong action can cause the engine to stall and not start. We will try to help you with your question.

[Hide]

Why does a car with automatic transmission stall?

There may be several reasons for this behavior of the car. Let’s say right away that only high-quality diagnostics will help accurately identify a breakdown, and the information below is only a theory, since we have not seen your car and do not know under what circumstances it stalls.

So, the most common reasons:

1. Very low quality fuel. The car may not run at all on low-quality gasoline, diesel or gas. In practice, this problem usually manifests itself among those motorists who install gas installations on their cars and refuel with low-quality gas. You need to get rid of low-quality fuel and fill in new one. If your car is equipped with gas equipment, then you also need to check the gas filter. The performance of fuel filter elements should be checked on both gasoline and diesel cars.
2. Damage to the mass air flow regulator. We recommend checking the functionality of the device, as well as its connection diagram; there may be a break or short circuit in the wiring.
3. Malfunction. With such a problem, the car may stall while driving. As in the previous case, it is necessary to check the functionality of the regulator, as well as its wiring.
4. If the vehicle stalls while braking, the breakdown may well be related to the vacuum brake booster. We recommend diagnosing the mechanism only if you know how to do everything correctly.
5. Clogged throttle valve. As practice shows, it is the throttle that in most cases causes the car to fail to start.
6. Naturally, you should also check the fuel level in the tank.

In any case, if you do not know how to diagnose a transmission, then you need to seek help from specialists. Using a computer check, a professional will diagnose the unit and identify all possible faults in the form of codes that will need to be deciphered. If necessary, it will be possible to check the operation of the engine itself.

Often car owners are faced with a very unpleasant problem: the car suddenly stalls while driving. Then immediately, perhaps after a certain time, it starts up again and drives as if nothing had happened. Such faults at service stations belong to the class of flickering faults; many workshops charge double the cost for their repair. And this is understandable: it can be difficult to detect. After all, as a rule, the so-called general effect works here in reverse. If an auto electrician comes to such a call, the car starts up as if nothing had happened and works until the technician leaves. I myself have found myself in such situations more than once. First, let's figure out, in general, what is needed for the engine to work.

Conditions for normal engine operation

Va engines internal combustion For stable operation required:

• constant injection of air, and in proportions corresponding to the fuel;
• optimal pressure in the ramp;
• normally working nozzles (injectors);
• correct ignition angle;
• working sensors and actuators engine control unit;
• required compression;
• V gasoline cars– plus ignition spark.

In motorist parlance, an engine needs air, fuel, compression and ignition.

From the point of view of the probability of failure of the internal combustion engine, gasoline engines more vulnerable, because they have additional system– block high voltage ignition, which is very sensitive to weather conditions operation. Drivers know that once a diesel engine is started, it can “burb” all day long, although not always.

Why does it happen that a car stalls and then starts? To the most probable reasons Such malfunctions include:

1. Immobilizer problems

For most motorists, an immobilizer poses a great danger. And this is understandable: you can’t deal with it without special equipment, and the services of auto electricians to fix problems with the immobilizer are expensive. If for some reason the immobilizer blocks the engine control unit, then various models cars behave differently. In BMW, if there are problems with the immobilizer, the starter usually does not even spin; most models allow you to try to start it. But in Renault, as in some other models, the engine usually starts, but after a few seconds it stalls. Then it starts again, and after the same time it stalls. This can go on indefinitely.

Immobilizer synchronization failure occurs for the following reasons:

• use of a non-original key or loss of a chip from it;
• battery discharge in the key, if the circuit provides power to the chip;
• breakage of the pumping loop (located in the area of ​​the lock cylinder);
• failures of car alarms with auto start (transponder);
• Malfunctions in the power supply circuits of the engine control unit, immo.

Just in case, you can check if your key has a chip.

If your car has on-board computer, the immobilizer failure will be indicated in the form of a message such as IMMO or SECRET SERVICE, KEY or a blinking yellow LED. It should be remembered that if you started the car and drove it several hundred meters, the immobilizer has already been synchronized with the engine control unit, it sudden stop will not be in any way related to this issue. That is: stopping the engine while driving is not an immobilizer problem!

2. Crankshaft sensor malfunction

It is responsible for general ignition synchronization, both in gasoline and in diesel engines. If the sensor is faulty, then in 95% of cases the car will not start at all. But if the sensor is on the verge of its performance, then the engine may fail. The fact is that the sensor is usually electromagnetic. It represents an inductor wound with an extremely thin wire around a magnetic core. During use and wear, moisture may enter it. When the engine heats up while driving, the sensor coils may open and the engine stalls. Then, while you are struggling to start it, the engine cools down, the sensor coils close again, and the car starts up as if it should. So: typical situation faulty sensor crankshaft: the engine starts when cold without problems, after 15 minutes of driving it suddenly stalls, then, after you wander around the car for half an hour, it starts again without problems. Advice for car enthusiasts - wet it cold water rag and place it on the sensor. Somehow you will get home while the sensor is cooling.

By the way, this malfunction may not be diagnosed when it is cold.

3. Flow meter malfunction

This sensor is involved in the quality formation of the mixture. If the flow meter is clogged (this often happens on run-down engines, it becomes clogged with oil), the mixture is formed enriched, it can flood the spark plugs. At idle speed in traffic jams or when coasting, this can cause the engine to stall. Then the engine starts with difficulty again, and so on. You can try cleaning the flow meter with carburetor cleaner. Many car enthusiasts turn it off altogether and, if the car stops stalling, they drive like this for a couple of years.

Installing a new flow meter to replace a heavily contaminated old one solves the problem for a short time. If piston group or valve stem seals badly worn, the sensor will soon become dirty again.

4. Ignition system for gasoline internal combustion engines

If one of the spark plugs floods or one of the high-voltage wires breaks, the engine usually does not stop. But if the ignition coil (if it is single or double) breaks down when heated, then the car may periodically stall, then start again after a while. Sometimes the coil has microcracks. In wet weather, moisture can get in there and the car may stop suddenly. Sometimes during a rainstorm or if it gets into a puddle, the ignition system becomes flooded with rainwater. Then, as it dries, everything returns to normal. There is only one way to check the ignition coil: throw in a known good one, because a broken coil can ring normally using a multimeter.

5. Idle speed control

If the idle speed is not adjusted correctly, or the governor drive is stuck, the engine may stop at idle speed. Bypass regulators and regulators with stepper motors you can try cleaning it.

6. Air leak

Usually leads to uneven operation of the engine, which may stall when sudden movement accelerator pedals. Many service stations use smoke machines to search for leaks. Experienced mechanics use a good cigarette.

7. High pressure pump wear

If you suspect the fuel pump, it is better to remove it and take it for diagnostics.

8. Low pressure in the ramp

Typically, engine shutdown occurs due to the fault of the electronic valve pressure regulator installed in the fuel pump. As a rule, flushing the valve does nothing.

9. Fuel pump wear

In many situations, the fuel pump remains in visually working condition, that is, it seems to be pumping. But its productivity and pressure drop to critical levels. The impeller begins to pump, then the pressure decreases by an order of magnitude. The car keeps moving and then shuts up. Change the fuel pump without question. Now the pumps themselves are inexpensive, they can be replaced without equipment, which costs money.

10. Car alarm failures

Frequent malfunction. If the alarm is installed by a non-professional, even worse, in garages, it may begin to fail immediately. After 7 years of operation, all alarms begin to fail. Typically, alarm systems use fuel pump circuits to block theft. If the signal fails, fuel is cut off. Nowadays it has generally become fashionable not to install alarms, but to turn them off. There are more and more such calls to service stations. Advice: install alarms only at proven service stations, otherwise you won’t find anything in a couple of years; When buying a used car, find out the coordinates of who installed the car alarm.

If your car begins to periodically stall while driving, then start, immediately solve the problem, determine the cause of the problem and fix it. Otherwise, sooner or later it will stall for a long time.

Read about troubleshooting other problems.

This article will talk about why the car stalls while driving. The reason for this phenomenon may be the most banal, but you will get a lot of troubles from such “behavior” of the car. In addition, the engine may stall at idle speed. This is not very pleasant; the engine seems to start, but after a while it stops working. It is possible that the engine does not want to start if its temperature is close to operating temperature. Working temperature engine is about 90 degrees. And there can be many reasons, but we need to consider the main ones.

Most common reason

It is worth paying attention to the fact that all reasons can be divided into several categories. Why does the car stall while driving? The reason can be both trivial and complex. If we are talking about injection engines, then very often the regulator that is responsible for the speed fails. It is the one that supplies required amount air into the fuel rail. The idle speed control is stepper Electrical engine, with its help, the channel opens and closes, through which clean air passes into the ramp for mixture formation. So, first of all, you need to make sure that the idle air control is working properly. To do this you need to scroll crankshaft starter, at the same time depress the gas pedal. The engine starts, but the number of revolutions constantly changes. There is an obvious failure of the IAC - the engine stalls when you press the gas. And most effective method to get rid of such trouble is complete replacement element. You need to install a new one. On VAZ cars this is done literally in a matter of minutes.

Throttle problems

Quite often, the reason that the engine starts to stall is the throttle valve itself. It's possible that it's worn out air filter, so the entire surface of the valve was dirty inside. To fix this breakdown, it is enough to clean the damper completely from the inside. Please note that after thorough cleaning the problem may persist; the engine still stalls when you press the gas. In this case, you need to make sure that the position sensor is in good condition. This sensor is variable resistor. It is installed on the damper axis. Moreover, maximum wear is observed in the extreme position (corresponding to idle speed). If it fails, it must be completely replaced. The cost of the part is quite low, and replacement occurs literally in a matter of minutes. But it is possible that the engine begins to stall, despite the fact that all sensors are in perfect condition.

Fuel quality

Always watch what kind of gasoline you fill your car with. In most cases, all of the above symptoms appear as soon as you fill the tank with fuel. Of course, the engine may stall after some time. Therefore, it will be difficult to immediately determine the breakdown. It is also worth paying attention: the reason that the engine begins to stall or stall should always be sought in the gasoline itself. To cure this “disease”, you will need to completely drain the gasoline from the tank and also replace the fuel filter. Unfortunately, you don’t always buy at gas stations quality fuel. Therefore, it is worth choosing one brand of manufacturer that sells the highest quality gasoline. Of course, there are times when the car stalls while driving (the reason for this does not lie in gasoline). Please note that it is excessive low cost- this is the first sign that gasoline is of dubious origin. And pouring it into the tank is tantamount to pointing a car at full speed ahead into the pillar

Spark plug

To make sure they are working properly, you need to unscrew them all, check the size of the gap, as well as the presence of carbon deposits. And your car stalls while driving. The reason may be hidden in the candles. In the event that there is heavy carbon deposits, but the gap is within acceptable values, it is necessary to clean the spark plug electrodes. But the best way out is to install new spark plugs. In the same case, if the gap is very large, there is excessive wear of the electrode, cleaning will not help, it is necessary to completely replace the set of spark plugs.

Fuel filter

Here is another very common reason why a car stalls while driving. VAZ or foreign car - it doesn’t matter. But this is especially true for older cars. Some drivers simply forget that the car has a gasoline filter. It is located at the bottom of the fuel pump. Of course, if there is dirt in the filter, gasoline will simply not flow into the fuel rail and the combustion chamber will not work. There will definitely be interruptions in the fuel supply. At the same time, by pressing the gas pedal, you turn off the engine. To get rid of this malfunction, you need to remove the gasoline pump and replace the filter. It is also worth considering that the tank itself can cause the filter to quickly clog. Therefore, either replacing the container or thorough cleaning can help.

Air filter

The situation is similar as in the case of a gasoline filter element. Please note that the operation and repair of the vehicle must be carried out in accordance with the manufacturer's requirements. After all, you know that a mixture of gasoline and air is supplied to the combustion chamber. Consequently, if any component of this mixture does not enter the fuel rail, the engine will stall. Consider an example of how a motor operates when there is not enough air. Too much gets into the combustion chamber, causing the spark plugs to flood. At the same time, it feels as if the engine is choking. Among other things, some motorists who do not know about the principle of operation of an internal combustion engine can cover the inlet pipe with a rag to prevent water from getting into it. It's funny, but this happens.

Fuel pump

If then, of course, the car stalls. The carburetor will work perfectly, but no one gives it gas. On injection cars the fuel pump is located under back seat. On carburetor engines - near the camshaft (since it is driven from it). If it stops working, the engine may Idling It functions normally, but when the speed increases, it will definitely stall. However, when completely worn out If the gasoline pump is used, the engine will not start at all. To get rid of this malfunction, it is necessary to either repair the pump or replace it completely, which is the most effective. Concerning carburetor engines, then the pump diaphragm drive rod may wear out greatly.

Electrical equipment

The problem of stopping the engine may also be due to a malfunction of electrical equipment. In particular, oxidation may occur on the batteries. Whether old cars or new ones, they all need maintenance and careful care. Consequently, the contact deteriorates as the resistance increases, and this leads to the engine stalling. The battery itself may also fail. In the same case, if the generator does not produce the required current, all electrical network The car switches to power from the battery. If you do not immediately see a light on, indicating that there is no charging, the car will continue to move. Given that the lights are on and the ignition system is running, after a while the battery will be completely discharged and the engine will stop. You will have to charge the battery and also completely repair the generator.

As a rule, the true cause of the breakdown is revealed quite simply. And even a car owner who does not have deep knowledge of vehicle repair can easily correct problems that arise that are accompanied by incorrect behavior of his car.

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 spark plugs, which prevents the spark from appearing or causes it to work periodically.

Advice: If there are interruptions in the operation of the spark plug set, 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 breakdowns components in 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 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.

spark plug

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 contacts for batteries. At bad contact terminals, 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. In addition, if the power supply is insufficient, the backlight side panel will gradually fade, and a set of other diagnostic sensors will show incorrect values.

timing belt

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 may also be due to gasoline not meeting the requirements specified in the vehicle specifications. octane number. 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 sharp pressing gas pedals. 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 unstable work the machine even when idling and during rapid braking (when the supply of the fuel mixture decreases). And if performance 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 done at 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.

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, carry out full diagnostics exhaust system and replace this element.

car muffler

Problem with the vehicle's braking system

This problem is associated with malfunctions in the design of the vacuum booster. The symptoms are as follows: as soon as you try to brake sharply at full speed, you will see how quickly the engine stalls. This defect can be eliminated by repairing the amplifier adjuster or replacing the entire mechanism completely.

What to do if cars with automatic transmission stall?

If your vehicle has automatic transmission gears, then the problem must be looked for in the power 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.

Video: why does your VAZ car not start, jerk, jerk, or stall?