If your car VAZ-2107 has a malfunction, as a result of which the engine stalls, then further movement becomes problematic. But to find the cause of this malfunction for the G7 injection engine is quite difficult without the presence of diagnostic equipment, since, unfortunately, there are many reasons why the crankshaft stops rotating.

Most often, an injection engine stalls during operation idle move... The throttle assembly with an idle speed controller (IAC) may be involved in this malfunction, since during the operation of the engine, the throttle unit can become very dirty, which leads to jamming of the IAC rod. To check this assumption, it will have to be removed, and in the presence of contamination, carefully rinse with a liquid well-washing oil mixed with dirt.

If you have a VAZ-2107 on your car alarms, which works with the electric circuit of the gasoline pump, the reason why the engine stalls may be the poor-quality work of those who installed it. If they did it on twists, then the poorly compressed twist weakens over time and, as a result, contact is lost. As a result, the electric fuel pump stops working.

A possible reason for the engine stalling can be re-enrichment of the combustible mixture... This can be checked by removing the spark plugs. If they are covered with black carbon, then the mixture is rich. The amount of gasoline supplied to the engine cylinders depends on the position of the throttle valve and the correct reading of the temperature sensor, which is wrapped on the left in the rear of the cylinder head. When replacing it, you will have to partially drain the antifreeze from the cooling system.

Failure also leads to a strong enrichment of the mixture. mass air flow sensor(DMRV). You can check its condition with a multimeter. The measurement is made between the green and red wires (the 2nd and 4th terminals, if you count from left to right) with the ignition on. If the voltage is more than 1.002 volts, then it will have to be replaced.

With a strong depletion of the combustible mixture, the engine will also stall. And its depletion occurs due to air leaks behind the throttle assembly. Possible places for air leakage are usually the gaskets of the intake system, either as a result of loosening the fasteners of the parts between which they stand, or because of their breakdown. The air leaks can be found with a smoker used by beekeepers. Having smoked the engine compartment with it, it will be immediately visible where the smoke is drawn in. And at decent service stations, instead of a smoker, they use a device called a smoke generator.

VAZ 2107 is not the best model among cars in its class when compared with foreign approximate counterparts. Nevertheless, due to its low price and affordable service, the car has been popular throughout the post-Soviet territory for many years. The car was produced from 1982 until 2014. That is, the oldest model is more than 30 years old. During such a period of operation, the owner will be able to face all types of malfunctions and investigate most of the causes of malfunctions.

After several years of operation, the VAZ 2107, as well as the almost identical model 2105, begins to show a new character with changes not for the better. Malfunctions associated with the power unit and its body kit are of a different nature, but symptomatic:

• the engine stalls periodically;
• does not keep stable momentum;
• unstable idling;
• hard to start;
• insufficient power;
• increased fuel consumption.

All malfunctions appear for two reasons: violation of adjustments or wear of parts.

Usually expressed in a spontaneous change in engine speed. Observed while driving and at idle. The most common reason for the running speed of the VAZ2107 / 2105 injection units is the failure of the DMRV (mass air flow sensor).

This device controls the amount of air entering the engine. Based on these data, the ECU regulates the supply of the combustible mixture with the optimal ratio of fuel and air under different engine operating conditions. Accordingly, in the absence of this balance, engine speed begins to depend on the amount of oxygen supplied. That is, a breeze blew - the turnover increased, the verse - decreased.

It is quite easy to make sure that it is the DMRV that is faulty. Disconnect the device connector and the ECU will enter emergency mode. In this mode, fuel delivery is controlled by the throttle position. If the car began to behave more adequately, then the DMVR is faulty. You can drive like this, but power will drop slightly and fuel consumption will increase.

A failed mass air flow sensor cannot be repaired, with the exception of contamination, so you can try to clean it.

Algorithm for cleaning the DMVR VAZ2107 / 2105:

1. Dismantle the sensor together with the protective cover.

1. Unscrew the two screws and pull the sensor out of the base without touching the surfaces of the active element (current bent wire).
2. Wash the casing with any dishwashing detergent.
3. Using a cylinder with a cleaner for a DMVR or for a carburetor, based on alcohols (no acetone), gently clean the surfaces.
4. Pour generously 3-4 times, the liquid should drain.
5. Dry the device.
6. Assemble the block in reverse order.

If the problem persists, you will have to buy a new device.

Unstable operation of the carburetor engine

The nature of the unstable speed of the VAZ2107 / 2105 engine with carburetors is the same as that of the injection engine, in the uncontrolled supply of air or fuel to the combustion chamber.

But in this case, the carburetor is responsible for preparing the combustible mixture. This is a completely mechanical device that is responsible for the optimal ratio of fuel to oxygen for different modes of operation of the power unit.

Despite the fact that there are filters at the fuel and air inlets, they can work ineffectively, as a rule, due to a long service life, which exceeds that specified in the maintenance standards. As a result, small particles clog the carburetor jets.

Drivers with great experience do not stand on ceremony much, they throw the VAZ2107 / 2105 carburetor into a bucket of gasoline for a day, then blow it from all sides with compressed air and the carburetor seems to be working normally. This is a normal solution, but flammable. Among the causes of engine malfunctions, which are caused by a breakdown of the carburetor, one can single out:

• displacement of the position of the adjusting screws from shock or vibration;
• an increase in the diameter of the orifice of the nozzles due to wear;
• damper axle wear, limiting its stroke;
• clogging of the jets;
• violation of the tightness of the float.

To determine the malfunction of the VAZ2107 / 2105 carburetor, and it is likely to be complex, start by checking the float for leaks. To do this, remove it from the carburetor top cover (it must be dismantled). If there is gasoline in the float - discard the float, if there is air - check in a basin of water for bubbles. Suppose he passed the exam, then it is necessary to check the gap.

Lift the carburetor cover upright. The gap between the float chamber and the carburetor wall should be 6.5 mm.

Install the carburetor cover and run the engine for 30 seconds. Remove the cover. The gasoline level should be exactly in the middle of the tapered surface of the carburetor body. If this does not work out, you should slightly bend the angle of the float rod.

Over time, air and fuel jets will either clog or wear out. In the first case, they must be cleaned and blown out. In the second case, you should check the throughput of the nozzles using a water tank installed above the measured nozzle by 1 meter. They are connected by a tube. A volumetric flask is installed at the bottom. Measurements are carried out in units of cm3 / min. Depending on the marking of the jet, the volume of liquid collected per minute in a volumetric flask must correspond.

It is much easier to buy a set of jets and replace them after 7-10 years of carburetor operation.

Those who use gas installations should be aware that the carburetor is not used when driving on gas. Over time, oxide forms inside the dry jets, which clogs the fuel supply holes. A petrol car may not start. It is recommended to periodically use gasoline.

Carburetor adjustment

Carburetor adjustment consists of several steps:

1. Adjust the position of the float as described above.
2. Check and refit the "quality" and "quantity" screws. Screw them all the way in and unscrew 2-3 turns for the "quality" screw and 3-4 for the "quantity" screw.
3. Connect a tachometer or auto-tester to the "K" terminal of the ignition coil, and the second probe to the body.
4. Start and warm up the engine to a temperature of 90 ° C

1. Use the "quality" screw to set the maximum idle speed. Gasoline flow is increased by turning the screw counterclockwise.
2. Use the “quantity” screw to set the speed higher, approximately 80-90 rpm.
3. Using the quality screw, we determine whether these revolutions are maximum, if not, then we repeat the procedure.
4. If the position of the quantity screw does not affect the engine speed, tighten the quality screw so that the speed drops to 800-900 rpm.

This carburetor adjustment may not be entirely accurate, but does not require special equipment.

If the car stalled

An engine that suddenly stalls not only creates an inconvenience while driving, but also poses a safety hazard to the driver and passengers. There are several reasons.

Stalls at idle speed:

• failure of the idle sensor;
• failure of the throttle sensor;
• failure of the throttle position sensor.

Stalls on the move:

• interruption of fuel or air supply due to a dirty filter;
• fuel pump malfunction;
• clogging of the carburetor jets;
• overheating of the engine.

It is better to start diagnostics of a car whose engine stalls in the most unexpected places by checking the idle speed sensor.

It is easy to check its performance. Dismantle the device without removing the contacts, or connect them after dismantling. Hold the device in your hands, put your finger on the cone needle and ask your friend to turn on the ignition. If you feel jolts, then put the device back. The idle sensor is OK.

If the throttle sensor is out of order, then the car will not only stall, but also will not start, because the ECU will give the command for maximum fuel emission, the candles will fill up and the engine stalled.

If you are on the road in a VAZ car and there is a problem with the throttle sensor, then it is easier not to bother and contact the nearest service, but if you reached the garage, you can use the following instruction:

1. Remove the sensor.
2. Using a 2 mm drill, drill out the plastic cover in a circle.
3. Take out the plastic pad of the upper contact block.
4. At the bottom deck, clean the tracks with WD-40 or rubbing alcohol.
5. The same is with the contact group of the top cover, but do not bend them, they will then prematurely eat the tracks.
6. Reassemble in reverse order.
7. Coat the contour with any glue for plastic.

Not enough air

Often the car starts up well, it rides on suction, but as soon as the suction is turned off, the engine stalls. This says only one thing - lack of air. The air jets are most likely clogged. They must be unscrewed and cleaned. Then check that the car should not stall without suction.

There are an incredible number of reasons for the poor-quality operation of car units with similar symptoms, but only a specialist with a set of professional diagnostic tools can figure them out. But if you feel confident in yourself - go for it, in VAZ car services they are already waiting for you.

How to solve this problem? Get started cleaning the throttle valve, especially since you can do it yourself. The only caveat is that for high-quality cleaning, you must purchase a special composition in advance, which allows you to efficiently blow through the injector and other components of the iron structure

Also inspect the oil trap, if it is clogged, it's time to clean it as well. Otherwise, very soon the crankcase ventilation system will clog up, and the engine will literally suffocate from excess gases, which means it will not be able to cope with idling.

If the engine stalls and then starts

Incorrect operation of the car at idle speed is also possible if the firmware of the electronic control unit designed for the engine is installed incorrectly. This happens if the car enthusiast overdoes it with tuning the VAZ-2107. As a result of experiments, the vehicle gives excellent dynamics, but when the revolutions reach 1000 in 1 minute, the car is not able to maintain the pace, which is why it stalls.

Fortunately, this type of breakdown is rare, most often it is the instability of a number of sensors that is to blame:

• the sensor responsible for the mass flow rate of the air flow, it is also called the mass air flow sensor;
• a sensor that detects and helps to adjust the position of the damper (abbreviated name - TPS);
• auto idle regulator, called IAC.

These sensors are almost impossible to repair, so all that can be done is to replace them with new ones, if you change them gradually, the procedure is inexpensive.

How to repair the idle speed regulator

The injector, in fact, does not need to be regulated, because the intelligent on-board control system is responsible for the operation of the machine. The idle speed regulator built into the injector is a mechanism that opens and closes the air flow, and the air itself passes through a channel specially equipped for this.

Unfortunately, it is difficult to establish the exact breakdown of the idle speed controller (IAC) based on the readings on the side panel - the malfunction signal will not light up. But what will immediately become obvious is the instability of the rotations or their complete disappearance. If there is a "Check" signal on the VAZ-2107 instrument panel, it is quite possible that the IAC is to blame. This means that the engine detonates, and this signal is transmitted to the control unit, powered by the electronics.

How to diagnose a VAZ-2107 injector

Practice shows that if the injector stalls at idle, in 70% of cases it is the IAC that is to blame, so we suggest learning how to diagnose:

1. Measure the voltage at the block where the regulator works. Normal voltage is 12 V. If the voltage is less, examine the battery wear and charge.
2. If the voltage is completely absent, check the entire power supply circuit of the mechanism and then take on the computer diagnostics.
3. When the multimeter, put into resistance mode, shows a value other than 53 ohms between the pairs of terminals, disconnect the IAC and turn the ignition. If the needle is immobilized, then it is the idle speed sensor that has broken.

How to repair an injector in a VAZ-2107

If replacing the sensors has not yielded results, it is better to go to the service station. The banal lack of tightness of the intake manifold provokes the appearance of the same problem when the car stalls at idle.

With your own hands, inspect the vacuum hoses, gaskets, injector sealing rings, and then the plugs that are in the manifold, the brake pedal vacuum booster. It is easy to determine air leakage using a special unit called a smoke generator. Do not disregard checking the gasoline pressure.

Owners of VAZ 2107, 2110, 2112, 2114, and other cars as well, may face a problem - the car starts up and immediately stalls. The engine starts, but after a few seconds the rpm drops and the engine stalls. Consider the possible causes of a startup malfunction, and how to fix them.

First you need to go through the most obvious options.

• Out of gasoline (diesel). As paradoxical as it may sound, drivers often forget to monitor the fuel level in the tank.
• On diesel engines (especially in winter), frozen fuel can cause the car to start and almost immediately stall.
• The quality of gasoline at filling stations is often appalling, so if you fill a car with low-quality fuel, you can face the problem of a stalling engine. If there is a little bad gasoline, you can dilute it with good gas. But if the tank is full, then it is better to drain the surrogate out of harm's way.
• Worn wires and old (faulty) spark plugs are also very common causes.
• Compression of the engine, or rather its absence, can provoke a situation in which the engine stalls barely having time to "pick up". But this is already a very serious breakdown, the appearance of which is accompanied by a host of other symptoms, which are simply impossible not to notice during the operation of the car.

The injector starts and stalls

Injection vehicles can behave this way due to a malfunctioning fuel pump. It is in the tank. It is very easy to check its performance. If you turn the ignition key to the first position and listen, you will hear how the pump works, pumping gasoline into the system.

Severe contamination of the fine fuel filter can also lead to the car stalling after starting. The filter simply does not have time to pass the required amount of gasoline.

ECU errors quite often lead to problems with starting the engine, not receiving signals from certain sensors, or receiving them in a distorted form. Diagnostics of such breakdowns is best done in specialized services.

Why carburetor cars start and stall

If the car starts up and immediately stalls, then the problem may be due to the lack of fuel in the float chamber. You can try to manually pump up the fuel pump. It must be checked for operability, and, if necessary, replaced.

Before you engage in self-cleaning of the power system in general and the carburetor in particular, it should be remembered that any unconscious manipulations can lead to a large increase in fuel consumption.

Another reason why the engine stalls is that the mesh filter in the carburetor in front of its entrance is clogged. If the car starts up and stalls after a few seconds because of this filter, then it must be cleaned and rinsed. To do this, use a toothbrush and thinner (gasoline or acetone). After that, immediately, together with the filter, clean the slot into which it is inserted.

It happens that in VAZ cars, a few seconds after starting, the speed drops due to a malfunction of the solenoid valve. The check is carried out as follows: the valve is unscrewed, power is supplied to the positive contact, and the body is closed to the motor ground. If the valve is working properly, a distinct sound will be heard, and the needle will enter the body.

You can just wire the valve to the valve and put it in place. If the click is not heard, the valve is faulty. We unscrew the valve and take out the jet from it. If it is bent, it needs to be replaced. Make sure the valve stop needle moves freely and that the valve gasket is not torn and that it fits snugly against the body.

If there is a click of the valve, then it is necessary to diagnose the EPHC system. The idle fuel jet may need to be cleaned. If a car's engine speed drops, clogging can affect the stability of the vehicle. To clean the jet, it is necessary to create an increased vacuum in the channels of the system.

To do this, we start the car and raise the revs to 3000. We turn out the jet holder (solenoid valve) for a few revolutions. This allows you to create the required vacuum in the channels. We repeat the procedure several times.

Other reasons for the incorrect start of the VAZ 2107 engine

Another common problem due to which the engine of VAZ 2107 cars starts and stalls is excess air entering the carburetor. In this case, the fuel mixture cannot keep the engine running for a long time, and although the car starts up, it stalls after a few seconds. It is necessary to determine the place of air leakage and eliminate the gap.

It happens that the nozzles and nozzles of the dosing system become clogged. This also affects the drop in engine speed, so that the VAZ 2107 stalls after a few seconds. What to do in this case? It is necessary to unscrew the jets and pipes under the carburetor cover and clean them. After that, blow out the wells and jets with compressed air. If you have a Solex carburetor, then you also need to clean and blow the fuel jets located at the bottom of the wells.

Adjusting the fuel level in the float chamber (Solex carburetors)

In addition to all of the above, engine speed drops if the fuel level in the carburetor (float chamber) is incorrectly adjusted. As a result, there is either insufficient or too much gasoline in the fuel mixture.

When adjusting the VAZ 2107 carburetor, it does not need to be disconnected from the engine. Follow these steps:

1. remove the air filter housing by unscrewing all fasteners;
2. remove the carburetor cover;
3. check the position of the floats. To do this, spread and bring them together to achieve the correct position.

It is necessary to achieve such a position of the floats so that they move freely without clinging to the walls of the chamber in which they are located. It will not be superfluous to measure the distance from the protrusions on the floats to the paper pad. The distance should be within 0.75–1.25 mm. Use a dipstick to measure.

What if it is far from the norm? In this case, you need to adjust the height of each of the floats.
As we have seen, there are not so few reasons why the engine stalls. To start the engine correctly, you need to check and eliminate all of the above malfunctions. After that, if the problem has not been resolved, you will have to contact the specialists.

In this article, we will talk about such an unpleasant problem as engine stalling and bad starting. Consider the main reasons why the engine stalls at idle and on the move. In addition, let's talk about why the engine does not start hot, as well as options for solving each of the above problems.

Common reasons why singles stall:

1. The most common is the idle speed regulator (sensor), which is directly related to the idle speed of the engine. It is quite simple to check whether the breakdown is in it. If the car does not start when you crank the starter, operate the gas pedal, the engine should start. If the revs begin to float immediately after you take your foot off the pedal - 99% that the reason is in the idle speed control. The solution is, this will take VAZ owners a minimum of time.

2. The second probable reason why the engine stalls at idle is throttle problems. This trouble is being treated - a banal one.

3. If after cleaning the problem persists, we make the assumption that the reason for which the engine stalls at idle may be the TPS (throttle position sensor). The problem is solved in a way, the procedure is not complicated and really doable with your own hands.

There are frequent cases when the engine stalls on the move, as they say for no reason. The most probable and most common reasons for which this may occur will be listed below.

Motor stalls on the move - reasons

1. Poor-quality fuel is the first thing that comes to mind for most of us, moreover, it is necessary to start from this the search for the cause of the engine stopping on the move. You will be "lucky" if this happens immediately after refueling, in which case it is safe to say that the problem is in the fuel. It is treated by draining fuel and.

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

3. Fuel filter. A clogged filter can interrupt the fuel supply, causing you to gas and the engine stalls on the move. It is enough to eliminate the malfunction.

4. Air filter. Everything is the same as with the fuel, if it is clogged, then the air does not flow, therefore the fuel-air mixture comes out re-enriched and the candles are simply flooded. In addition, due to lack of air, the engine will choke, that is, the power will drop, and the combustion process in the cylinders will not be able to take place, in the end the engine will stall. To eliminate this malfunction, it is enough to replace the air filter.

5. Defective fuel pump - the second "suspect". If your fuel pump is not all right, then the car will behave this way, it will stall on the move, or the engine will not start at all. The problem is solved by checking the pump, repairing it, or.

6. Battery. Oxidized battery terminals or poor contact can cause engine stalling. Check the terminals, clean them if necessary or replace the battery.

7. If the engine stalls on the move and no longer starts, the generator may also be the cause. A failed generator does not charge, as a result, the on-board network of the car is powered exclusively by the battery, and as you know, it will not last for a long time. As a result, you, unaware that the car is running on a battery, continue to move until it is completely discharged. It is treated - and.

6. In advanced cars, the reasons can also be with electronics and various sensors. If you are not strong in this and all of the above nodes and parts are normal, then it is better to contact the specialists, otherwise you can replace the floor of the car with no sense by "typing" method ...

Why the engine stalls hot, a well-heated engine won't start?

1. The first possible reason is. While driving, 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 also cools. 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 starts to get very hot from the hot engine body. The remaining gasoline in the float chamber from the high temperature begins to evaporate, filling the voids - the air filter, the intake manifold and the carburetor itself. Air locks are formed, 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 through the fault of the fuel pump or the fuel line. This typically occurs in hot weather, when vapor in the fuel system or pump creates air pockets that prevent 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 motor cranks, rather than just clicking or not responding at all. If so, one of the above options was confirmed. it is necessary to check the starter. If you are on the road, then the check can be reduced to an elementary check of the starter power cable or other visual operations. If you get home, make a detailed one. In case of malfunction or replacement.

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

Well, it seems like they haven't missed anything !? That's all for today, we hope the article will help, tell you the cause of the breakdown and help in solving 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 the attention.