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

Also inspect the oil trap; if it is clogged, it’s time to clean it. Otherwise, very soon the crankcase ventilation system will become clogged, 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 functioning of the vehicle Idling It is also possible if the firmware of the electronic control unit intended for the engine is installed incorrectly. This happens if a car enthusiast goes overboard with tuning the VAZ-2107. As a result of experiments 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 due to the instability of a number of sensors:

• sensor responsible for mass air flow, also called mass air flow sensor;
• a sensor that determines and helps adjust the position of the damper (abbreviated name - TPS);
• car idle speed regulator, called IAC.

These sensors are practically irreparable. Therefore, 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 control

In fact, the injector does not need to be adjusted, 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 again, and the air itself passes through a channel specially equipped for this.

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

How to diagnose a VAZ-2107 injector

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

1. Measure the voltage at the block where the regulator operates. The normal voltage is 12 V. If the voltage is less, examine the battery wear and charge.
2. If the voltage is completely absent, you should check the entire power circuit of the mechanism and then start diagnosing the computer.
3. When the multimeter, switched to resistance mode, shows a value other than 53 ohms between pairs of terminals, disconnect the IAC and turn the ignition on. If the needle is immobilized, it means that the idle speed sensor is broken.

How to repair an injector in a VAZ-2107

If replacing the sensors does not produce results, it is better to go to a service station. The banal lack of tightness of the intake manifold provokes 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 located in the manifold, and the vacuum brake pedal booster. It is easy to detect air leaks using a special unit called a smoke generator. Do not ignore checking the gasoline pressure.

VAZ 2107 not best model among cars of its class, when compared with foreign equivalents. However, thanks to its low price and accessible 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 most old model is over 30 years old. During such a period of operation, the owner will be able to encounter all types of faults and investigate most of the causes of problems.

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. Problems associated with power unit and its body kit has different character, but symptomatic:

• the engine stalls periodically;
• does not maintain stable speed;
• unstable operation at idle;
• 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 during movement and idle speed. The most common reason for low speed in VAZ2107/2105 injection units is the failure of the mass air flow sensor (mass air flow sensor).

This device controls the amount of air entering the engine. Based on this data, the ECU regulates the supply of a combustible mixture with the optimal fuel-to-air ratio under different engine operating modes. Accordingly, in the absence of this balance, engine speed begins to depend on the amount of incoming oxygen. That is, the wind blew - the speed increased, the speed died down - it decreased.

It is quite simple to make sure that it is the mass air flow sensor that is faulty. Disconnect the device connector and the ECU will go to emergency mode work. In this mode, fuel supply is controlled by the throttle position. If the car begins to behave more adequately, then the MVR is faulty. You can drive like this, but the power will drop slightly and fuel consumption will increase.

A failed mass air flow sensor cannot be repaired, except for contamination, so you can try to clean it.

Cleaning algorithm for DMVR VAZ2107/2105:

1. Remove the sensor along with the protective casing.

1. Unscrew the two screws and pull the sensor out of the base without touching the surfaces of the active element (straight, bent wire).
2. Wash the casing with any dishwashing liquid.
3. Using a bottle of cleaner for DMVR or for carburetor, based on alcohols (without acetone), carefully clean the surfaces.
4. Pour generously 3-4 times, the liquid should drain.
5. Dry the device.
6. Reassemble 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 an injection engine, in the uncontrolled supply of air or fuel into 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 operating modes of the power unit.

Despite the fact that there are filters at the fuel and air inlets, they may not work efficiently, usually due to a long service life exceeding that specified in the maintenance standards. As a result, the carburetor jets become clogged with small particles.

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

• displacement of the position of the adjusting screws due to shock or vibration;
• increase in the diameter of the jet holes due to wear;
• wear of the damper axis, limiting its travel;
• clogging of jets;
• failure of the float seal.

To determine the malfunction of the VAZ2107/2105 carburetor, and it will most likely be complex, start by checking the tightness of the float. To do this, remove it from the top carburetor cover (it needs to be removed). If there is gasoline in the float, throw away the float; if there is air, check in a bowl of water for bubbles. Let's say it passed the exam, then it is necessary to check the gap.

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

Install the carburetor cap and run the engine for 30 seconds. Remove the cover. The gasoline level should exactly coincide with the middle of the conical surface of the carburetor body. If this does not work, you should slightly bend the corner of the float rod.

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

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

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

Carburetor adjustment

Adjusting the carburetor involves several steps:

1. Adjust the position of the float as described above.
2. Check and set the “quality” and “quantity” screws to the initial state. Screw them all the way and unscrew them 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 housing.
4. Start and warm up the engine to a temperature of 90°C

1. Use the “quality” screw to set the maximum idle speed. The gasoline supply increases when the screw is rotated counterclockwise.
2. Use the “quantity” screw to set the speed higher, approximately 80-90 rpm.
3. Using the quality screw, we determine whether these speeds are maximum; if not, then we repeat the procedure.
4. If the position of the quantity screw does not affect engine speed, tighten the quality screw so that the speed drops by 800-900 rpm.

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

If the car stalls

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

Stalls at idle:

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

Stalls while driving:

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

When diagnosing a car whose engine stalls in the most unexpected places, it is better to start by checking the idle speed sensor.

It's easy to check its functionality. Dismantle the device without removing the contacts, or connect them after dismantling. Hold the device in your hands, place your finger on the cone needle and ask a friend to turn on the ignition. If you feel shocks, then install the device back. The idle speed sensor is OK.

If the throttle sensor fails, the car will not only stall, but also will not start, because the ECU will give a command for maximum fuel release, the spark plugs will flood and the engine will stall.

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

1. Remove the sensor.
2. Using a 2 mm drill, drill out the plastic cover in a circle.
3. Remove the plastic pad of the upper contact group.
4. On the lower platform, clean the paths with WD-40 or alcohol.
5. Same with contact group top cover, but do not bend them, they will then eat the tracks prematurely.
6. Reassemble in reverse order.
7. Apply any plastic glue along the contour.

Not enough air

Often the car starts up well and runs on choke, but as soon as the choke is turned off, the engine stalls. This indicates only one thing - lack of air. Most likely the air jets are clogged. They need to be unscrewed and cleaned. Then check that the car should not stall without suction.

There are an incredible number of reasons for poor performance of car components 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, VAZ service centers are already waiting for you.

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 and 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 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. The treatment for this problem is trivial.

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, 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.

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. It can be treated by draining the fuel and...

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, if necessary.

3. Fuel filter. In order clogged filter can cause a fuel interruption, causing you to rev and the engine to stall while driving. To troubleshoot it is enough.

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 air filter.

5. Faulty fuel pump - the second "suspect". If your fuel pump If not everything is in order, then the car will behave exactly like this, it will stall while driving or the engine will not start at all. The problem is solved by checking the pump, repairing it or.

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 is being treated - and.

6. In advanced cars, the reasons may also be with electronics and various sensors. If you are not good at this and all the above components and parts are normal, then it is better to turn to specialists, otherwise “at random” you can replace the floor of the car to no avail...

Why the engine stalls when hot, A well-warmed engine won't start?

1. The first possible reason is. 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, 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. Second possible reason strange behavior warm engine - 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 got home, make a detailed one. In case of malfunction or replacement.

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.

Here we will look at everything in detail possible reasons, due to which the carburetor in a VAZ 2107 car stalls. In most cases, the breakdown can be repaired independently, but sometimes it will be necessary complete replacement carburetor

If you notice some of these phenomena in the operation of the VAZ 2107, then you should carefully check the carburetor. You may find something broken in it.

• If the VAZ 2107 starts and immediately stalls, the carburetor may be the cause. All subsequent attempts to start the engine will be unsuccessful.
• In cases where the engine is difficult to start, the carburetor should also be checked. The car may stall after a short time of operation.
• If the engine stalls immediately after starting, this is also a sign of a carburetor problem. The engine will stall several times, and only after numerous attempts will you be able to start the VAZ 2017.

Causes of failure of the carburetor VAZ 2107

Here we will describe step by step all the possible reasons that the VAZ 2107 starts and stalls.

If the cause of a carburetor breakdown is the lack of fuel in the float chamber, then there is a high probability that the fuel pump or power system is also faulty. Simply remove the hose from the fuel inlet fitting. After this, make a couple of presses on the lever to manually supply fuel. Gasoline should flow out of the hose hole. If the stream was weak or completely absent, then you need to carry out a detailed check of the fuel pump and power system.

A clogged filter is also a common cause of carburetor failure. It will be very easy to correct this reason. You will need to remove the strainer and then clean it. For cleaning purposes, you should use a toothbrush, or something similar.

You can try rinsing the filter with acetone. A can of compressed air can also help. Blow through the entire filter with it. Clean the filter seat. Sometimes it may be necessary to completely replace this part, but it is better to just try to clean it.

Broken solenoid valve or fuel jet of the idle system

First of all, you need to look at the position of the fuel jet and solenoid valve. As a result of some kind of breakdown, it can turn away, which is why the breakdown occurs. Just turn it on. Also try removing the wire from the valve and putting it back on. You should hear a characteristic click. It indicates that the valve is working. If you do not hear a click, then connect the battery positive and the valve terminal. If you do not hear a click, then the valve will need to be replaced. If there is a click, it is worth checking the EPH system.

The serviceability of the valve can be checked by removing the fuel nozzle from it. Examine it carefully. It should not be contaminated or damaged. Look at the O-ring and the locking needle. The jet should be thoroughly cleaned and blown out with compressed air.

This is a very broad problem that will be difficult to fix. It doesn't always cause the car to stall. This may happen if fuel mixture very much depleted of excess air. This is the reason why the carburetor in the VAZ 2107 starts and stalls. In this case, you need to check the entire carburetor.

Particularly susceptible:

• Ring under the valve;
• Tube to vacuum tube;
• Tube to valve cover;
• Quality screw ring.

Sometimes it will be easier to replace the entire carburetor.

Trigger diaphragm damaged

If the reason is the trigger diaphragm, then it will have to be completely disassembled and inspected. Sometimes it may be necessary to completely replace the starter, but not often. It will need to be adjusted. Be sure to replace the diaphragm with a new one.

Clogged fuel and air jets

Emulsion wells and dosing system tubes may also be clogged.

You will need to disassemble the carburetor, remove the above parts and clean them. To clean, you need to use acetone, a brush and a can of compressed air. They must be cleaned of all visible contaminants. It is worth noting that in Solex and ozone systems the components will be the same. Only their location differs.

Cleaning requires:

• Air jets;
• Emulsion tubes;
• Fuel jets;
• Emulsion wells.

All components need to be cleaned, even if some of them are not very dirty. This will help avoid repeated breakdowns.

Clogged fuel and air jets of the idle system

Clogging of these areas of the carburetor can also cause the VAZ 2107 to start and immediately stall. In this case, you will have to disassemble them. This is quite easy to do, you just need to carefully unscrew the jets. Next you need to clean them and blow them with compressed air. Sometimes they may need to be replaced. You can try cleaning the jets without resorting to full analysis carburetor This will significantly reduce cleaning time.

The fuel level in the float chamber is broken

This is very common reason why the carburetor stalls in the VAZ 2107. This is due to incorrect adjustment of the fuel level. The fact is that the fuel mixture is disrupted. It can be highly enriched, or vice versa, depleted. In this case, adjustments need to be made. It may take a long time, but this way you can avoid carburetor malfunctions.

Choke not adjusted

Because the choke may not be fully open, the fuel may become richer. Most often this does not lead to serious problems, but sometimes the fuel becomes so rich that the engine is very difficult to start. Especially if it has been heated by long driving. In this case, it is worth adjusting the air damper (suction). Sometimes a highly enriched mixture can even flood the candles.

If the air damper is working correctly, it should cover the cross section of the right chamber. This occurs when the handle is fully extended. And if the handle is recessed, then it should stand vertically. If this does not happen, then the cause of the carburetor breakdown is precisely the incorrect adjustment of the choke. Adjusting it shouldn't take you much time.

Other reasons why the VAZ 2107 stalls

A VAZ 2107 may stall not only because of the carburetor. This may occur due to failure of other systems. First of all, pay attention to the ignition system. Its failure can often be confused with a carburetor failure. This is because the symptoms of a faulty ignition system are very similar to the signs of a faulty carburetor. You also need to check the power system. It may also be the reason why the VAZ 2107 starts and immediately stalls.

conclusions

Most of the above causes of breakdowns can be eliminated yourself. To do this, you just need to strictly follow the instructions. Most often, you just need to clean some parts of the carburetor, but sometimes you may need to completely replace the carburetor in a VAZ 2107. This way you will quickly get rid of many problems associated with the fact that your car starts and immediately stalls.

Situations when a VAZ injector starts up immediately and then immediately stalls arise quite often. And all because of the fuel injection system (forced type). To correct this situation, car owners often use a heating plug, but this is not a solution to the problem, but only a temporary measure. If a VAZ 2107 starts and stalls immediately after turning the key in the ignition, then in most cases this indicates a problem in fuel delivery (the fuel pump is clogged or not working correctly), or the quality of the fuel used leaves much to be desired, and the injectors are simply clogged. And the car starts only on the remaining fuel in the cylinders.

Finding the faulty component

So, what should you do if the engine starts easily, but then immediately slows down and stalls? The first thing you need to do is check for carbon deposits on the spark plugs. If some of them are covered with a layer of carbon deposits, then the engine a priori cannot operate normally. It first starts due to the movement of the starter, but immediately after that it slows down, since several cylinders physically cannot withstand the entire load from crankshaft. The carburetor, by the way, can also fail due to such a problem.

So what is the cause of engine failure? If the car starts, then at least the spark is fine. That is, the electrics work as expected. It wouldn’t hurt to unscrew the heads and try to find those spark plugs that are covered with a layer of soot. You can clean them by burning them over a gas burner and cleaning them with alcohol (this can only be done when the contacts are cold).

The injector itself may also become clogged. In this case, the fuel supply to the combustion chamber simply does not work. The following actions should be taken:

• remove the blocks and check the valves;
• check the operation of the sensors;
• check whether the engine operates normally at temperatures above 80ºС.

Naturally, the fuel pump itself can also fail. When the engine starts, the injector turns automatically due to the starter, and then the thrust comes from the generator. If one of these components is not working correctly, the car will simply stall. Here again we are talking about the residual amount of fuel in the cylinders. If the engine immediately stalls, and along with it the starter also works unevenly, then most likely the problem is either in it or in the ignition switch.

You should try to replace it with a known good one and retest the engine operation. As a last resort, the contacts are simply clamped.

What to do if the problem is in the ECU?

The engine may not operate properly if the on-board computer malfunctions. At VAZ, it is he who is responsible for the timely supply of fuel, synchronizing the operation of the injector nozzle and spark plugs. When the engine stalls immediately, this indicates a mismatch in the timing of fuel supply and ignition of the fuel mixture.

As a rule, changing the firmware or restoring it to the factory state helps. Although sometimes it may simply be necessary to adjust the fuel supply cycle, as well as the saturation of the mixture. In extreme cases, on a VAZ 2110 (or later model), you will have to replace the entire ECU unit or turn it off, switching the engine to manual operation only.

It should be noted that not only the ECU itself is responsible for the operation of the engine, but also a bunch of sensors that regulate the pressure in the injector, the saturation of the mixture, and the ignition timing.

That is, you need to check their work. Although, if a malfunction is detected in one of them, a signal should be given Check Engine on dashboard. This, for example, happens when the VAZ 2110 starts up. This does not happen only if the ECU simply does not receive signals from the sensors. It is worth noting that the model 2107 does not have a computer installed by default, but the injector does not work without it.

Similar problems arise when the carburetor is synthetically converted to an injector, but the same on-board computer is retained. They simply change the firmware in it, connect new modules, but you need to understand that it was not originally designed for such work. Thus, if the carburetor is rebuilt, then the ECU must be changed along with it to a compatible model. Fortunately, VAZ took care of their release.

So, if the injector starts and immediately stalls, then the main reasons for such a malfunction are malfunctions in the electronics (including the ECU), incorrect operation fuel system or problems with gasoline filtration. Identifying the root cause is not a problem. As a last resort, you can always contact the service center. But it is worth remembering that any adjustments to the work on-board computer can only be added when the engine is in full working order.