Situations when the VAZ injector starts up immediately, after which it 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 candle, but this is not a solution to the problem, but only a temporary measure. If the VAZ 2107 starts up and stalls immediately after turning the key in the ignition lock, then in most cases this indicates a problem in the delivery of fuel (the fuel pump is clogged or does not work properly), or the quality of the fuel used leaves much to be desired, and the nozzles are simply clogged. And the car starts only on the remains of fuel in the cylinders.

Finding the defective component

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

So what is the cause of the engine malfunction? If the car starts, then at least the spark is fine. That is, the electrician works as expected. It will not be superfluous to unwind the heads and try to find those candles that are covered with a layer of carbon. You can clean them by burning them over a gas burner and cleaning alcohol (this can be done only when the contacts are cold).

The injector itself can also become clogged. In this case, the fuel supply to the combustion chamber simply does not work. You should do the following:

• remove the blocks and check the dampers;
• check the operation of the sensors;
• check if the engine runs normally at temperatures above 80 ° C.

Naturally, the fuel pump itself can malfunction. At the time of starting the engine, it is automatically turned into the injector by the starter, and then there is a thrust from the generator. If one of these components does not work properly, the car will simply stall. Here again we are talking about the residual fuel quantity in the cylinders. If the engine immediately stalls, and the starter works unevenly with it, then, most likely, the problem is either in it or in the ignition lock.

You should try to replace it with a known good one and retest the engine operation. In extreme cases, the contacts are simply clamped.

What if the problem is in the ECU?

The engine may malfunction if the on-board computer malfunctions. In VAZ, it is he who is responsible for the timely supply of fuel, synchronization of the operation of the injector nozzle and spark plugs. When the engine immediately stalls, this indicates a mismatch between the timing of the fuel supply and the 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 delivery 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, putting the engine into operation only from mechanics.

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 moment.

That is, you need to check their work. Although, if a malfunction of one of them is detected, a Check Engine signal should be sent to the 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 in the 2107 model, the computer is not installed by default, but the injector does not work without it.

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

So, if the injector starts up and immediately stalls, then the main reasons for such a malfunction are malfunctions in the electronics (including the computer), improper operation of the fuel system or problems with filtering gasoline. It is not a problem to identify the root cause. In extreme cases, you can always contact the service station center. But it is worth remembering that any adjustments to the operation of the on-board computer can only be made with a completely serviceable engine.

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, the 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 engine operation 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 at 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 leaks 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.

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 that 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 that 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 incorrectly installed. This happens if the motorist 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 virtually indestructible, so all you can do is 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 then 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 regulator (IAC), based on the readings on the side panel - the malfunction signal will not light up. But what will immediately become apparent 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. This means that the engine detonates, and this signal is transmitted to the control unit, powered by the electronics.

How to diagnose the VAZ-2107 injector

Practice shows that if the injector stalls at idle speed, 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 did not give 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.

Hello everyone today I want to talk about the reasons why your VAZ 2107 car stalls, and due to this unpleasant annoyance, you can no longer continue driving on your iron horse. Today we will try to consider the main reasons why your engine stalls. Of course, unfortunately, there are many such reasons.
The first reason is problems with the idle speed control (IAC), usually the car stalls at idle. Pxx can fail due to contamination, and this leads to the fact that the stem wedges. To make sure you need to remove the IAC from the seven and rinse thoroughly in case of contamination. It is advisable to use a liquid that washes away the oil well.

The second reason due to which the VAZ 2107 stalls is the alarm (if, of course, it is installed), in most cases the alarm works with the electric circuit of the gasoline pump, but where does this ask you? And besides, the unscrupulous mechanic who connected the alarm to you could do his job poorly from here and problems may follow. Moreover, if they did everything on twists, then over time it weakens, and everyone write letters, as they say. Power to the pump ceases to flow, as a result of which the VAZ 2107 does not start.

The third reason is that the fuel mixture is too rich. You can check this version by unscrewing the candles, if the contacts of the candles are covered with black carbon, this means that the mixture is too rich. For how much gasoline is supplied to the cylinders, the position of the throttle valve, as well as the readings of the temperature sensor, is responsible; on a VAZ 2107 car, this sensor is located on the left in the back of the block head. If it becomes necessary to replace the temperature sensor, then you will have to drain some, then part of the antifreeze.
Failure of the mass air flow sensor (DMRV) on the VAZ 2107 also leads to an enrichment of the mixture. You can check the operation of the DMRV using a multimeter. If the voltage is more than 1.002 volts, then it will have to be replaced.

The fourth reason is the strong depletion of the combustible mixture. As a result, your "Seven" will also stall. This is mainly due to air leaks. The main places of suction are the gaskets of the intake system, or loosening of the fastening in the places where they stand. To find air leaks, a smoke generator is usually used to see where the smoke is being drawn in.

And the fifth reason is the vacuum brake booster. Since air leaks can also pass through it. This happens due to a leaky diaphragm. You can determine a faulty vacuum tank on a VAZ 2107 by pinching the hose that connects the vacuum amplifier and the intake manifold, if the engine does not stall, then most likely you will have to change the vacuum tank.

Well, that's all we have considered the main reasons why the VAZ-2107 car stalls, if you had other reasons, then write in the comments. Goodbye to everyone.

The stable operation of the engine of a VAZ 2107 car depends on the serviceability and correctness of the settings of its systems. Adjustment of the idle speed is possible without the involvement of specialists, provided that all recommendations of the operating manual are followed. A working carburetor with a correctly set ignition timing and gaps between the distributor contacts.

The regulation of the mode according to the technical documentation must be carried out using a device that determines the level of CO in the exhaust gases. In garage conditions, the carburetor is usually adjusted by eye and by the built-in tachometer. The description prescribes a crankshaft speed between 700 and 900 rpm. At lower values, the carburetor systems are unable to ensure stable engine operation, at higher values, fuel consumption increases.

The power unit of a VAZ 2107 car runs on gasoline, while the quality and composition of the fuel do not always meet the requirements of the standard. A clogged carburetor, particularly the idle system, can lead to erratic operation. Depending on the degree of contamination, manifestations can be different up to the spontaneous stop of the motor.

The main reasons for the unstable operation of the engine of a VAZ 2107 car when idling:

1. incorrect fuel level in the float chamber;
2. clogging of the strainer, jets and channels;
3. restriction or obstruction of the valve stroke in EPHH;
4. air suction through damaged gaskets, membranes or tubes;
5. clogged air filter;
6. burning of contacts or incorrect gap between them;
7. substandard candles;
8. incorrect adjustment of the ignition timing.

Before proceeding with tuning the carburetor, you should restore its performance, otherwise it is impossible to achieve a stable result.

Maintenance and troubleshooting

Routine work on systems that ensure engine operation should begin with a complete inspection. For convenience, the air filter housing is removed from the carburetor and all air pipes are inspected. There should be no cracks on them, and the material should remain elastic. If necessary, the carburetor is dismantled and it is completely disassembled with defect detection and replacement of faulty parts.

The next stage is diagnostics, elimination of identified faults and adjustment of the ignition system. It is recommended to clean the contacts in the distributor with fine sandpaper, replace the spark plugs and set the lead angle correctly. This can be done using a tester or a primitive test lamp. It makes sense to go directly to the regulation of the VAZ 2107 engine only if the carburetor and other systems are put in order.

Powertrain setup

The idle speed is adjusted in a well-ventilated room or outdoors. Make sure that the air damper is fully open by pushing the handle forward until it stops. The carburetor is now completely ready for setting the mode.

The sequence of actions of the wizard is as follows:

1. A device sensor is inserted into the exhaust pipe, which determines the concentration of carbon monoxide in the exhaust. The device turns on and readings are taken from it, which characterize the operation of the carburetor.
2. If the set parameters are exceeded, the screw of the mixture quality is tightened with a screwdriver. This action is carried out in several steps with constant monitoring of the exhaust.
3. The drop in idle speed is compensated by the fact that the VAZ 2107 carburetor is adjusted by the screw of the amount of the mixture.

The procedure continues until the engine runs stably in this mode. In the absence of a device, the adjustment of a serviceable carburetor on a VAZ 2107 car can be done without it. With a certain skill, this operation will not take much time.

Idle speed adjustment without device

Most experienced craftsmen and drivers adjust the VAZ 2107 power unit as follows:

1. The carburetor mixture quality screw sets the minimum speed at which the engine runs unstable, but does not stall.
2. The speed is increased by adding the mixture.

The mixture quality screw procedure is repeated until the carburetor ensures stable engine operation.

In practice, this method is used quite often and with sufficient driver experience, a positive result is guaranteed.

Idling adjustment on a carburetor VAZ 2107

Idling is a mode of engine operation in which there is no load on the crankshaft. It is necessary to maintain the combustion of a minimum amount of fuel so that the engine does not stall and does not have to use battery power to restart. Unstable idle speed leads to the fact that the engine stalls or runs intermittently, therefore periodically it is necessary to adjust the idle speed on the VAZ 2107 (carburetor). Today you will find out why there is no idling on a VAZ 2107 car with a carburetor and how to adjust it.

Idling adjustment for a vaz 2107

Why is idling unstable - VAZ 2107 carburetor?

Depending on the reasons, idling may be unstable or absent altogether. Both malfunctions are typical for any carburetor installed on a VAZ 2107.

To make the correct adjustment of this mode, you need to know about the reasons, which may be the following:

1. Insufficient or excessive level in the float chamber. A float chamber is needed to regulate the pressure between the fuel system and the diffuser and maintain a constant fuel level ready to spray. If the level is insufficient, the chamber does not have time to supply gasoline to the chamber, and if the level is too high, it overflows so that the fuel does not have time to burn.
2. Dirty carburetor. It can touch both its tubules and individual elements: mesh filter parts, as well as valves and various nozzles.
3. The DAAZ 2107 - 1107010 carburetor may fail the idle sensor or it is an EPHH malfunction. It is quite common. The valve may be installed incorrectly, as a result of which it is difficult to move.
4. Excessive air intake. It manifests itself in the form of leaks in the joints of the carburetor parts or there is a breakdown in the manifold gasket.
5. High degree of contamination of the air filter.
6. Trambler malfunction - burnt contacts.
7. Incorrect adjustment of the lead angle or idle speed of the VAZ 2107 (carburetor).

There is a solution to the problem for each reason. Therefore, we will consider more complex malfunctions and find out why there may be no idle at all.

No idling carburetor VAZ 2107 - what is the reason?

The concept of "no xx" on the VAZ 2107 carburetor means that in addition to the unstable operation of the engine, there is a stop. It can occur immediately after starting, or it can come later, giving the motor the opportunity to work.

The reasons for the lack of idle are as follows:

• Forced idle economizer malfunction;
• Air leaks;
• Incorrect ignition timing.

All these problems are accompanied by the fact that the carburetor cannot be adjusted. Therefore, first we will learn how to eliminate the causes.

Defective EPHX sensor

The idle economizer or idle speed sensor is located under the hood on the VAZ 2107 and bolted to the side of the carburetor. It is a small cylindrical electromagnet screwed into the unit. On the back of the valve there is a contact, the wire from which goes to the power supply circuit of the ignition switch.

EPHH control unit: 1 - block outputs; 2 - case; 3 - printed circuit board with microelectronic elements.

If the carburetor does not lend itself to any adjustments or does not idle on the VAZ 2107, and XX disappears very quickly or the engine is unstable, then it makes sense to start the engine and try to unscrew the valve a little. If the carburetor engine recovers, tighten the valve slightly and try changing the amount of mixture. In 90% of cases, the carburetor starts working properly again.

Another case is complete valve failure. To do this, you need to check it. You need to connect it directly to the battery. If clicks were heard, then the valve is working. Try screwing it into the carburetor and starting the engine. If successful, you need to look for a break in the electrical wiring and then you will not need to adjust xx.

Air leaks

It is one of the most difficult problems and can be caused by several reasons:

1. Crooked footprint
2. Defective gaskets
3. Throttle valve not closed

To be sure of the presence of this problem, it is necessary to check the color of the spark plugs and the number of revolutions at idle. If the revolutions are overestimated, and the candles have a white coating, then the mixture is depleted, which means that more air is supplied than it should be.

In this case, the check begins by treating the joints of the carburetor to the manifold with a throttle valve cleaner. Begin machining at the intake manifold, then move to the carburetor-manifold junction and complete the EPC. A change in RPM will indicate an air leak. It should be located at the joints of the gaskets.

However, the gasket may not always be the cause. If the carburetors are improperly installed and dismantled, irregularities may form on the surface of their joints, through which air is sucked in.

Another reason is the open throttle valve. More precisely, not completely closed. This will be more correct, because there is a bolt on the bottom of the upper carburetor cover for adjusting the throttle clearance. If it is unscrewed, then the damper opens slightly and a very large amount of air flows into the diffuser, reducing the gasoline content. That is why the flow rate becomes less, but the speed is too high, so it needs to be adjusted.

To fix, you need to remove the top cover and adjust the throttle position. The problem will go away immediately.

Float chamber level adjustment

This is the first step in adjusting any carburetor. It is from this part that the consumption and stability of the engine will depend. The level should be at the nominal mark established by the manufacturer, therefore it is very important to follow the technology.

Setting the fuel level in the float chamber:
I - carburetor cover; 2 - the saddle of the needle valve; 3 - stop; 4 - needle valve; 5 - ball of the locking needle; 6 - pull-back plug of the valve needle; 7 - float bracket; 8 - tongue; 9 - float; 10 - gasket.

The upper carburetor cover is removed, but before that, you need to pump up the manual fuel pump to check the set level. The denomination is the level of gasoline located on half of the inclined surface. If it is higher or lower, then adjust the level of the float by bending the adjusting tendrils. XX revolutions are also regulated by a float chamber.

To check, it is enough to put the cover on top, start the engine and turn it off immediately. Open the cover again and check the level. After that, you can proceed to the next stage.

How to adjust the carburetor of a VAZ 2107 at idle?

Now the most important thing. There must be a tachometer. After checking all the systems, their serviceability and correct settings, you can start adjusting the speed xx. To do this, the car is installed on a flat surface, the screws of quality and quantity are tightened up to the stop and unscrewed four turns, so they are adjusted from the factory.

In advance, you need to configure the launcher and completely remove it. The engine must be at operating temperature. If there is a need for a cold start, pull out the choke and remove it as soon as the engine warms up. But don't touch the gas pedal.

Set the speed to 800 rpm by tightening the air-fuel mixture amount screw. After that, you need to unscrew or tighten the quality screw so that the revolutions become the highest possible. Take your time to make the tuning process more accurate.

Tighten the amount screw again to 800 rpm. Now you need to adjust the quality screw until the engine starts shaking a little. This moment will be the most acceptable in terms of fuel economy and acceleration dynamics.

There is another method, which consists in cyclically increasing the speed using the quality screw. This process can be continued for a very long time, until the motor simply stalls. The most important thing is that the revolutions do not fall below 750 rpm, but also do not exceed 900. Otherwise, the engine will run unstable or consume too much fuel. Setting it up becomes more difficult.

If the overestimated speed of XX is regulated, then they noticeably reduce the engine resource, however, in winter, the adjustment is allowed at idle speed to 1000 rpm, when the carb freezes and needs additional mixture. After that, the next regulation will need to be tucked in in the spring to reduce the speed.

Adjusting the idle speed of the VAZ 2107 carburetor - how and why is this done?

Adjusting the idle speed on the carburetor is an integral part of the maintenance of the carburetor car, and in the injector, the idle speed sensor will help us in this situation. Today we will consider adjusting this mechanism on a VAZ 2107 car, but before that we will find out why the XX setting is performed.

Why adjust carburetor idle speed?

A carburetor is a mechanism that feeds the air-fuel mixture into the combustion chamber of an engine in a strictly specified ratio. Depending on the quantity and composition of the mixture (the composition in this case is called "quality"), many characteristics of the engine are determined: the stability of its operation, the power and consumption of the fuel consumed.

A perfectly tuned carburetor allows you to achieve the most efficient engine operation at XX. This means that it will have stable rpm and maximum power at the lowest fuel consumption. Therefore, it is necessary to adjust idle speed on the carburetor with the following symptoms:

• The engine is unreasonable and quite high fuel consumption... The econometric arrow constantly indicates not economical operation of the engine, and gasoline began to run out quite quickly.
• Reduced engine power. This means that it has difficulty gaining the necessary revs before the driver engages the next gear. In addition, there may be no traction at low rpm, the engine stalls, or there are dips in the gas pedal.

The main problem with the first two signs is that this can happen not only through the fault of the carburetor. Fuel filters, pumps, and a faulty ignition system may be to blame.

• The most important and significant reason is that the engine does not keep idling or does not keep it stable: engine vibration is possible, and the tachometer needle will constantly change its position. Eventually, the motor stalls by itself.

How to adjust the idle speed of the carburetor on a VAZ 2107

After you have found the main signs of improper operation of the carburetor, it is necessary to adjust the idle speed. Before starting this procedure, you need to make sure that the ignition system is working correctly, the fuel filters are clean and the fuel pump is working properly, only after that you can start adjusting the idle speed.

• First, warm up the motor to operating temperature. If this fails (engine stalls), pull out the manual choke control knob. After the engine has warmed up, shut it off and find two screws on the carburetor that are angled to each other. The one that stands perpendicular to the carburetor is called the amount screw, or in other words, the idle screw. It determines the amount of mixture that is supplied to the engine cylinders. The second screw is responsible for the ratio of gasoline to air, which is mixed in the carburetor and is called a quality screw. Tighten both screws and then unscrew the quantity screw by 4 turns and the quality screw by 3. Do not forget to remove the suction.
• Start the engine again. Most likely, the rpm will not be correct, so tighten or unscrew the number screw so that the rpm is 850-900 rpm. Now use the quality screw to set the engine to the highest rpm. To do this, unscrew or tighten the screw and carefully monitor the revolutions on the tachometer. To do this, you do not need to unscrew the bolt to the end, since the quality will reach its peak and the candles will simply "flood". Unscrew it until the corresponding interruptions appear.

Please note that the idling speed of the engine varies with the season. In the summer, it should not exceed 900, and in the winter - 1000 rpm.

Video - Simple DIY setting XX

This is how the idle speed is regulated on the VAZ 2107 carburetor. As you can see, it is not at all difficult.

VAZ 2107 does not keep idling: how to cope with the problem

VAZ 2107 is not the best model among cars in its class when compared with foreign approximate analogues. 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 faults appear for two reasons: violation of adjustments or wear of parts.

Unstable operation of the injection engine

Usually expressed in a spontaneous change in engine speed. Observed during movement and at idle. The most common reason for the 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 flow 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 the DMRV is faulty. Disconnect the device connector and the ECU will enter emergency operation. 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 unstable revolutions of a VAZ2107 / 2105 engine with carburetors is the same as that of an injection engine, in an 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 exceeding that specified in the maintenance standards. As a result, small particles clog the carburetor jets.

Drivers with a long 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;
• increase in the diameter of the orifice of the nozzles due to wear;
• damper axis 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 removed). If there is gasoline in the float, discard the float; if there is air, check it for bubbles in a basin of water. 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 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 below. Measurements are made in units of cm3 / min. Depending on the marking of the jet, the volume of liquid collected per minute in a volumetric flask should 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 holes. A petrol car may not start. It is recommended to use petrol periodically.

Carburetor adjustment

Carburetor adjustment involves several steps:

1. Adjust the float position as described above.
2. Check and refit the "quality" and "quantity" screws. Screw them up to the stop 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 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:

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

Stalls on the move:

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

It is better to start diagnosing 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 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. It says only one thing - lack of air. Most likely the air jets are 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.

Idle speed adjustment for VAZ 2101-VAZ 2107

Welcome!
Idling - Over time, a person who uses a car with impaired idling decides to adjust it, because as we all know, if the idle speed is too low, the engine will stall from time to time, and if it is too high, then the fuel consumption of this the engine increases and here you have to look for, as they say, the golden mean.

But in order to find this middle, you first need to learn how to adjust the idle speed on the car, and not all people know how to adjust the idle speed. Therefore, today we will analyze the issue concerning the idle speed adjustment on cars of the "Classic" family.

Note!
You only need one screwdriver for adjustment!

Summary:

Idling Adjustment Tips:
Firstly, the adjustment must be carried out at the engine operating temperature (90-95 ° C), and also when adjusting the air filter must be installed on the car.

Secondly, when adjusting the idle speed, the fuel level that is in the carburetor's float chamber must be adjusted.

Thirdly, the valve clearances must also be adjusted and the ignition timing of the car must be adjusted.

Fourthly, when adjusting the idle speed, the air damper should be fully open, you can check this by removing the roof from the air filter housing and, as a result, looking at the damper.

Fifth, adjusting the idle speed of a car is not always easy for a beginner, because adjusting the crankshaft rotation and adjusting the carbon monoxide (CO) content must be done together.

Note!
For a more accurate adjustment of the idle speed, it is necessary to use the "Gas Analyzer" which most owners do not have at all. But the adjustment can also be made without this device, but only this will be more difficult! (How to make adjustments without this device, see the heading: "Adjusting idle speed without a Gas Analyzer")

How to adjust idle speed on a VAZ 2101-VAZ 2107?

Before proceeding with the adjustment, see the photo below:

Note!
Let's start with the fact that the photo above shows the screws, thanks to which the idle speed is adjusted. As you can see, the screws are located deep in the carburetor throttle body, so the screw under the number "1" is not visible in the photo. On some cars, bushings are pressed onto both of these screws, thanks to which the screws can only be turned half a turn. If, due to these bushings, it is not possible to turn the idle adjustment screw properly, then remove the screws and, as a result, break the heads of the bushings. When the screws are unscrewed, wipe off the remnants of the broken bushings from them and then screw the screws back into place!

Idle speed adjustment using the Gas analyzer device:

Note!
So that you understand in more detail, when the screw is tightened, the crankshaft speed will gradually decrease, and with the opposite effect, that is, when it is unscrewed, the speed will gradually increase!

2) Now smoothly go to adjusting the "CO" content in the exhaust gases, for this turn the screw indicated under the number "1" in the photo above. When screwing in the screw under the number "1", the content of "CO" in the exhaust gases will gradually decrease, and when unscrewed, it will increase accordingly.

Note!
It is necessary to regulate the content of "CO" in the exhaust gases in accordance with the "GOST" at the present time. It is not necessary to lower the content of "CO" below the norm, because in this regard, the content of unburned hydrocarbons "CH" may sharply increase. By the way, when adjusting the screw "1", it can change the crankshaft speed!

3) And finally, turn the screw under the number "2", thereby bringing the crankshaft speed back to normal. After that, it is also recommended to check the "CO" content in the exhaust gases using a device. If it is necessary to re-adjust both screws, adjust them until the engine operation and the emission of "CO" into the atmosphere will not reach the norm.

Note!
After all adjustments, sit in the car and sharply press and then release the gas pedal. Make sure that the engine runs smoothly when you press the pedal, and when you release it, the car's engine should not stall. If the engine stalls after releasing the accelerator pedal, then increase the crankshaft rotation speed to "800 rpm". The crankshaft speed is regulated by the screw under the number "2"!

Idle speed adjustment without gas analyzer:

1) To begin with, slowly begin to rotate the screw of the mixture composition, which is indicated under the number "1". Rotate it until the crankshaft speed is maximum. (The frequency of rotation of the crankshaft can be very easily recognized by the readings of the tachometer)

Note!
By rotating this screw, the exhaust of harmful substances into the atmosphere is regulated. When this screw is screwed in, the amount of "CO" emitted into the atmosphere will decrease, and when unscrewed, on the contrary, it will increase!

2) Then, using the screw under the number "2", set the crankshaft speed to "1100 rpm".

Note!
The screw under the number "2" regulates the crankshaft speed, so when this screw is screwed in, the speed will gradually decrease, respectively, when unscrewed, it will gradually increase!

3) And at the end, tightening the screw for the composition of the mixture (Digit 1), achieve that the crankshaft speed is "800 rpm".

Question?
How do you adjust the idle speed of your car? (Write the answer in the comments)

Additional video clip:
Another way to adjust idle speed, which you can see in the video below:

Note!
Even if you watch the video, we advise you to read the article all the same, because it is written in more detail!