VAZ 2107 is not the best model among cars in its class, when compared with foreign approximate analogues. Nevertheless, due to the 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 over 30 years old. During such a period of operation, the owner will be able to encounter 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 intermittently;
• does not keep stable speed;
• 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. It is observed while driving and at idle. The most common cause of revving for 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 a combustible mixture with the optimal ratio of fuel and air under different engine operating modes. Accordingly, in the absence of this balance, engine speed begins to depend on the amount of oxygen supplied. That is, a breeze blew - the speed increased, the verse - decreased.

Making sure that it is the DMRV that is faulty is quite simple. Disconnect the device connector, and the ECU will go into emergency mode. In this mode, the fuel supply 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 a little and fuel consumption will increase.

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

Cleaning algorithm for DMVR VAZ2107/2105:

1. Remove 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 can of DMVR or carburetor cleaner, alcohol-based (no acetone), gently clean surfaces.
4. Pour abundantly 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 operating modes of the power unit.

Although there are filters at the fuel and air inlets, they may not operate efficiently, usually due to a long service life that exceeds the specified 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 they 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, can be identified:

• displacement of the position of the adjusting screws from shock or vibration;
• increase in the diameter of the hole of the jets due to wear;
• damper axle wear, limiting its travel;
• jet clogging;
• 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 tightness of the float. To do this, remove it from the top cover of the carburetor (it must be dismantled). If there is gasoline in the float, discard the float; if there is air, check in a bowl of water for bubbles. Let's say he passed the exam, then you need to check the gap.

Raise 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 level of gasoline should exactly coincide with the middle of the conical 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 either become clogged or wear out. In the first case, they must be cleaned and blown. In the second case, the throughput of the jets should be checked using a water tank installed 1 meter above the measured jet. A tube connects them. A measuring flask is installed below. Measurements are made in units of cm3/min. Depending on the jet marking, 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 be aware that the carburetor is not used when driving on gas. Over time, oxide forms inside dry jets, which clogs the fuel supply holes. The petrol car may not start. It is recommended to use gasoline periodically.

Carburetor adjustment

Adjusting the carburetor consists of several steps:

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

1. Set the “quality” screw to the maximum idle speed. The supply of gasoline increases when the screw is rotated counterclockwise.
2. Use the “quantity” screw to set the speed more, approximately 80-90 rpm.
3. With the quality screw, we determine whether these revolutions are maximum, if not, then 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 by 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 is not only a driving inconvenience, but also a safety hazard for the driver and passengers. There are several reasons.

Stalling at idle:

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

Silences on the go:

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

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

It's easy to check if it works. 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 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 will not start either, because the ECU will give the command for maximum fuel ejection, the candles 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, but if you reach the garage, you can use the following instructions:

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

Not enough air

Often the car starts up well, rides on the choke, but as soon as the choke is turned off, the engine stalls. It says only one thing - lack of air. Most likely clogged air jets. 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 the poor performance of car units with similar symptoms, but only a specialist with a set of professional diagnostic tools can understand them. But if you feel confident in yourself - go for it, VAZ car services are already waiting for you.

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

Also inspect the oil separator, if it is clogged, it's time to clean it. Otherwise, very soon the crankcase ventilation system will clog, 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 is also possible if the firmware of the electronic control unit designed for the engine is incorrectly installed. This happens if the motorist goes too far 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 unable to withstand the pace, which is why it stalls.

Fortunately, this variant of breakdowns is rare, most often due to the instability of a number of sensors:

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

These sensors are almost beyond repair. 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 controller

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 again, 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 on-board panel - the malfunction signal will not light up. But what will immediately become obvious is the instability of 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 for everything. This means that the engine is detonating, and this signal is transmitted to the control unit, powered by electronics.

How to diagnose the 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 diagnostics:

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

How to fix the injector in the VAZ-2107

If the replacement of the sensors did not work, 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, nozzle 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. Don't forget to check your fuel pressure.

If your VAZ-2107 car has a malfunction, as a result of which the engine stalls, then further movement becomes problematic. But finding 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 the idle speed controller (IAC) may be involved in this malfunction, since the throttle assembly can become very dirty during engine operation, which leads to jamming of the IAC rod. To check this assumption, it will have to be removed, and in the presence of contamination, gently rinse with liquid well-washing oil mixed with dirt.

If your car has a VAZ-2107 signaling, which works with the electrical circuit of the fuel 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 a 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 why the engine stalls may be re-enrichment of the combustible mixture. You can check this by removing the spark plugs. If they are covered with black soot, 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 at the rear of the cylinder head. When replacing it, you will have to partially drain the antifreeze from the cooling system.

The failure of the mixture 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 (terminals 2 and 4, counting 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 leakage behind the throttle assembly. Possible places for air leakage are usually the gaskets of the intake system, either as a result of loosening of the fastenings of the parts between which they stand, or due to their breakdown. The place of air leakage can be found with the help of a smoker, which is used by beekeepers. Puffing them into the engine compartment, you will immediately see where the smoke is drawn in. And at decent service stations, instead of a smoker, they use a device called a smoke generator.

Despite the development of the auto industry, classic VAZ models are still in great demand in the CIS countries. The latest models of the Classic, namely the VAZ-2107, were equipped with an injection intake system. It is more reliable than carburetor. But what to do if the VAZ-2107 starts up and stalls? The injector is a more complex system. But the problem can be solved by hand. Let's see how to do it.

Does the starter spin?

First you need to check the voltage in the car's on-board network. For a normal start of the machine, this indicator should not be lower than 12.5 V. To accurately measure the voltage, you must use a voltmeter.

A starter is a mechanism that requires a large starting current. It is this assembly that turns the crankshaft to start. Therefore, if the VAZ-2107 (injector) does not start, the reasons may be commonplace - low battery voltage. The solution is to charge the battery. You should adhere to the indicators in 12.5-14 Volts.

Starter failure

If there is a short in the housing or armature wiring, replace the damaged part. How to check an element? To do this, you need to use a multimeter. One wire is connected to the place of friction of the brushes, and the second - to the axis of the armature. If the arrow of the device deviates from the values, this may be a malfunction of the armature or winding. Check brushes. They should move easily, and their springs should be elastic and put good pressure on the anchor. After replacing damaged elements, start the engine again.

Ignition system

What to do if, with a well-charged battery and a working starter, the VAZ-2107 (injector) does not start? The reasons may be hidden in the ignition system. Here it is non-contact type. The first thing to check is the condition of the spark plugs. They can simply be "filled". Unscrew the elements out and inspect the condition of the electrode. In the presence of plaque, the part should be cleaned in an alkaline solution and screwed back. You should also check the gap between the electrode. To do this, use a special probe. The normal indicator should be in the range from 0.7 to 1 millimeter.

What if the indicator does not correspond to the norm? The electrode can be bent. But do it carefully. If the indicator is less than normal, use a minus screwdriver. If more, tap the electrode on a metal part (such as an engine valve cover). It would be useful to check the candles for spark generation. For this, a special gun is used. The spark itself should be blue. If the parts have traveled more than 60 thousand kilometers, they should be replaced. Also, when this period is reached, the ones going to them from the ignition distributor change.

When the candles are lit

If the VAZ-2107 injector does not start well (grabs but does not start), then the combustion chamber is overflowing with gasoline. The normal ratio of fuel to air should be 1:14. This problem often happens on these vehicles. When starting, the fuel pump pumps a lot of gasoline. By the way, on injection motors it is electric, submersible type. Installed directly into the tank.

How to dry candles without removing them? To do this, open the throttle when starting. It is mechanical here and is activated by pressing the accelerator trigger through the cable drive. This will allow more air into the combustion chamber and the engine will start immediately.

distributor

The VAZ-2107 car uses distributor ignition. If you need to check the condition of the contacts on the high-voltage wires. When the season changes, condensation forms on them. The distributor has five outputs.

Four of them go to the cylinder plugs, and one (central) goes to the ignition coil. A white coating often forms on the metal ends. Because of it, the slider will not be able to transmit impulses to the coil. By the way, it would be useful to check the ignition distributor itself. The detail looks like this:

If it is burnt, the part should be replaced. The price of a new element is 150 rubles. If a spark forms on the ignition coil when starting the engine, the high-voltage wire should be replaced. He also "punches" on candles. You can see it at night time. Small blue sparks are visible near them. In this case, the wires are changed as a set. They are inexpensive. New elements cost about 700 rubles.

Electric pump problem

Previously, one of the main problems on the domestic "Classic" concerned the fuel pump, which constantly overheated. But in the injector "seven" it is electric and is cooled by the gasoline itself, which is in the tank. If the element is not supplied with electricity, the car simply will not start. The first thing you should pay attention to is the fuse block.

On the cover it is written which one is responsible for the fuel pump. If the fuse is blown, replace it. A 15 or 20 amp cell can be used.

We determine the serviceability visually

Is it possible to check if voltage is applied to the fuel pump without a multimeter? To do this, when you turn on the ignition, you should carefully listen to its work. When you turn the key to the third position, it should make a characteristic hum. It can be heard in the rear of the cabin. If it is not there and the VAZ-2107 (injector) does not start, the problem is in the voltage supply. It is worth checking the pump relay. It should make characteristic clicks. Experienced motorists carry spare relays and fuses with them in case of sudden breakdowns. This relay is located on a shelf under the glove compartment.

Low pressure

Why does the VAZ-2107 (injector) not start? Problems may be hiding in the low pressure of the fuel line. For a normal start of an injection engine, at least 2.8 atmospheres are required. You can check this by disconnecting the supply tube from the ramp. Use a manometer for this. Malfunctions with the pump may occur due to frequent overheating. But how does this happen if it is a submersible type? The fuel pump kills riding on an empty tank. If the light comes on, do not tighten with refueling. The cost of the pump for the injection "seven" is 3 times higher than for the carburetor.

Filter status

The following situation also occurs. You arrived at your destination, turned off the engine for two minutes, got into the car and could not start it again. What to do if the VAZ-2107 (injector) This may be due to a clogged fuel filter. Its replacement period is about 50 thousand kilometers. A dirty air filter is also the cause of a difficult start.

If it has traveled more than ten thousand kilometers, then it must be replaced. Otherwise, you will run into startup problems.

VAZ-2107: the injector starts and immediately stalls

In this case, check the mass air flow sensor. It is located immediately behind the plastic filter housing.

This element receives information about the air flow and transmits it to the control unit. As a result, the electronics decide on the composition of the combustible mixture. The unit can deliberately adjust the concentration of fuel and air. The resource of the DMRV sensor is 150 thousand kilometers. When contaminated, the element may send false readings. Because of the VAZ-2107, the injector does not start or works and immediately stalls. You should also check the condition of the air pipes for tightness. If necessary, replace.

DPKV

If, with a working fuel system, the VAZ-2107 car (injector) does not start, If it is faulty, the control unit will stop supplying fuel due to lack of information about its position. The cost of this element ranges from one to one and a half thousand rubles.

Conclusion

So, we found out for what reasons the VAZ-2107 car does not start. As you can see, you can detect and fix a malfunction with your own hands, and for a small price.

Here we will analyze in detail all the possible reasons why the carburetor stalls in a VAZ 2107 car. In most cases, the breakdown can be fixed on your own, but sometimes a complete replacement of the carburetor will be required.

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

• 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 vehicle may stall after a short period of operation.
• If the engine stalls immediately after starting, this is also a sign of a carburetor malfunction. The engine will stall several times, and only after numerous attempts, you will be able to start the VAZ 2017.

Causes of breakdown of the carburetor VAZ 2107

Here we will describe in stages all the possible reasons that the VAZ 2107 starts and stalls.

If the reason for the breakdown of the carburetor was the lack of fuel in the float chamber, then it is likely that the fuel pump or the power system is also faulty. Simply remove the hose from the fuel inlet fitting. After that, make a couple of clicks on the lever for manual fuel supply. Gasoline should flow out of the hose hole. If the jet was weak, or completely absent, then a detailed check of the fuel pump and power system should be carried out.

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

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

Breakage of the solenoid valve or fuel jet of the idle system

First of all, you need to look at the position of the fuel jet and the solenoid valve. As a result of some breakdowns, it can turn away, which is why a breakdown occurs. Just trust him. Also try removing the wire from the valve and putting it back on. You should hear a characteristic click. It indicates that the valve has earned. If you do not hear a click, then connect the battery plus and the valve outlet. 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 EPHH system.

The serviceability of the valve can be checked by pulling the fuel jet out of it. Examine it carefully. It must be free of soiled areas and damage. Look at the o-ring and locking needle. The jet should be thoroughly cleaned and blown with compressed air.

This is a very broad problem that will be difficult to fix. Because of it, the car does not always stall. This can happen if the fuel mixture is very depleted of excess air. This is the reason why the carburetor starts and stalls in the VAZ 2107. In this case, you need to check the entire carburetor.

Particularly susceptible to:

• Ring under the valve;
• Tube to the vacuum cleaner;
• Tube to valve cover;
• Ring on the quality screw.

Sometimes it will be easier to replace the entire carburetor.

Starter diaphragm damaged

If the reason lies in the diaphragm of the trigger, then it will have to be completely disassembled and viewed. 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

The emulsion wells and tubes of the dosing system may also be clogged.

You will need to disassemble the carburetor, remove the above parts and clean them. For cleaning it is necessary to use acetone, a brush and a can of compressed air. They must be cleaned of all visible contaminants. It should be noted that in Solex and Ozone systems the components will be the same. Only their location differs.

Cleaning required:

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

All components must be cleaned, even if some of them are not very dirty. This will help prevent re-breakage.

Clogged fuel and air jets of the idle system

Clogging of these sections 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 easy enough 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 to clean the jets without having to completely disassemble the carburetor. This will greatly reduce cleaning time.

Violated fuel level in the float chamber

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

Suction not adjusted

Due to the fact that the air damper may not be fully open, the fuel may be enriched. Most often this does not lead to serious problems, but sometimes the fuel is enriched so much that the engine is very difficult to start. Especially if it has been heated up by a long ride. In this case, it is worth adjusting the air damper (suction). Sometimes a highly enriched mixture can even fill candles.

With the correct operation of the air damper, it should block the section of the right chamber. This occurs when the handle is fully extended. And if the handle is recessed, then it should stand up vertically. If this does not happen, then the reason for the breakdown of the carburetor lies precisely in the incorrect adjustment of the suction. Adjusting it shouldn't take you long.

Other reasons why the VAZ 2107 stalls

VAZ 2107 can stall not only because of the carburetor. This may be due to a breakdown in 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 those of a faulty carburetor. Still need to check the power system. It can also be the reason that the VAZ 2107 starts up and immediately stalls.

conclusions

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