VAZ 2107 injector starts and stalls reasons

Long-term and intensive use of the car leads to the accumulation of faults that can cause problems with starting the engine. Often, the power unit of the carburetor model VAZ 2107 starts poorly or does not turn on at all in the morning or after a long stay. The cooling time of the oil to ambient temperature in summer is about six hours.

At the end of this period, to start the VAZ 2107 engine, you need to close the air damper in the carburetor by pulling the choke all the way. If it does not start, as drivers usually say when it is cold, the cause of this phenomenon should be determined and eliminated. To do this, it is necessary to carefully examine the power unit and carry out a number of measures aimed at putting the components and mechanisms in order.

Looking for a faulty component

There can be a large number of problems in the car system due to which the engine refuses to operate stably. I will try to focus on the most basic and most common ones; it is worth saying that they cover approximately 95% of all engine failures with an injection-injector power system. So, here we go:

Checking the spark plugs. Carbon deposits on the spark plugs interfere with the normal functioning of the engine and the ignition of the fuel-air mixture in the cylinders. The engine can start due to the efforts of the starter, but then stalls, since the cylinders cannot withstand the entire load from the crankshaft
The injector itself could be clogged. Disassemble it, check the operation of the main sensors, observe whether the power unit operates normally at temperatures above 80 degrees Celsius
It is necessary to ensure that the fuel pump is functioning normally. Check all its contacts, and also make sure that no damage has happened to it.

These are the three most common reasons. Also, don’t forget about all the fuel and air filters. If they are clogged, the supply of the combustible mixture is disrupted, so the engine cannot operate fully. It is especially important to change the fuel filter on time, since the quality of our gasoline leaves much to be desired.

Main reasons for difficult starting

Each of the car models, both domestic and foreign, has its own operating characteristics. The engine most often starts if one of the systems is not functioning well: ignition, power or starter. A clogged carburetor, worn distributor or insufficient battery charge are the most common causes of difficult starting.

The VAZ 2107 car in this regard is no exception to the general rule; it has all the features of carburetor engines. Difficulties related to hot starting or the car not starting after a long period of parking, all this happens quite often. Qualified diagnostics of the systems mentioned above will eliminate the causes and significantly simplify the life of the driver.

Tips for motorists

If your VAZ-2107 passenger 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 “Seven” 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 in idle . The throttle assembly with the idle air control (IAC) may be involved in this malfunction, since during engine operation the throttle assembly can become very dirty, which leads to the IAC rod jamming. To check this assumption, you will have to remove it, and if there is dirt, carefully rinse it with a liquid that washes away well oil mixed with dirt.

If your VAZ-2107 car has an alarm system that works with the electrical circuit of the fuel pump, the reason why the engine stalls may be poor quality work of those who installed it. If they did it with 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 why the engine stalls may be over-enrichment of the combustible mixture . You can check this by unscrewing 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 located 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 of the mass air flow sensor (MAF) also leads to a strong enrichment of the mixture. You can check its condition using a multimeter. The measurement is made between the green and red wires (2nd and 4th terminals, counting from left to right) with the ignition on. If the voltage is more than 1.002 volts, it will have to be replaced.

If the fuel mixture becomes very lean, the engine will also stall. And its depletion occurs due to air leaks behind the throttle assembly. Possible places for air leaks are usually gaskets of the intake system, either as a result of loosening of the fastenings of the parts between which they are located, or due to their breakdown. The place where air is leaking can be found using a smoker, which beekeepers use. Having smoked the engine compartment with it, 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.

Why does a VAZ injector car start and stall immediately?

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 brakes, since several cylinders are physically unable to 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 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 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 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 up and immediately stalls, then the main reasons for such a malfunction are malfunctions in the electronics (including the ECU), improper operation of the 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 operation of the on-board computer can only be made if the engine is in full working order.

Why does the VAZ-2107 injector stall the engine at idle?

A working engine in a VAZ-2107, the injector should work if the car is started, constantly, regardless of whether the vehicle is in motion or idling. Reasons why the engine stalls at idle:

the idle speed controller is not functioning well;
the throttle valve, channels related to the carburetor, and injector are heavily contaminated;
the idle jet is dirty;
it's time to clean the fuel pump and air filter;
The mass air flow sensor and the sensor that reads the throttle position have refused to function;
The crankcase ventilation mechanism of the VAZ-2107 engine is clogged.

To fix these problems, you need to remove each part and thoroughly clean it from dust and dirt.

Assess the condition of the components; if it is far from ideal, there are chips and deep dents, it may be better to completely replace the old part with a new one.

VAZ 2107 injector starts and immediately stalls, the reason for this malfunction

Owners of VAZ 2107, 2110, 2112, 2114, and other cars, may encounter a problem - the car starts and immediately stalls. The engine starts, but after a few seconds the speed drops and the engine stalls. Let's look at possible causes of startup failure and ways to eliminate them.

First, let's look at the most common problems.

Gasoline (diesel fuel) has run out. No matter how paradoxical it may sound, drivers often forget to monitor the level of fuel in the tank.
On diesel engines (especially in winter), the reason that the car started and stalled almost immediately could be frozen fuel (but as a rule, diesel VAZs are very rare).
The quality of gasoline at gas stations is often appalling, so if you fill your car with low-quality fuel, you may encounter the problem of a stalled engine. If there is only a little bad gasoline, you can dilute it with good gasoline. But if the tank is full, then it’s better to drain the surrogate out of harm’s way.
Worn wires and old (faulty) spark plugs are also quite often the cause.
Engine compression, or rather its absence, can provoke a situation in which the engine stalls barely having time to “catch up”. But this is already a very serious breakdown, the appearance of which is accompanied by a host of other symptoms, which are simply impossible not to notice during the operation of the car.

A VAZ with an injector starts and immediately stalls

A few reasons:

Fuel-injected cars may behave this way due to a faulty fuel pump. It's in the tank. It is very easy to check its functionality. If you turn the ignition key to the first position and listen, you will hear the pump working, pumping gasoline into the system.
Severe contamination of the fine fuel filter can also cause the car to stall after starting. The filter simply does not have time to pass the required amount of gasoline.
ECU errors quite often lead to problems with starting the engine, not receiving signals from certain sensors, or receiving them in a distorted form. It is best to diagnose such breakdowns in specialized services.

Reasons why carburetor cars start and stall

If the car starts and immediately stalls, the problem may be due to a lack of fuel in the float chamber. You can try manually pumping up the fuel pump. It must be checked for functionality and, if necessary, replaced. Before you independently clean the power system in general and the carburetor in particular, you should remember that any unconscious manipulations can lead to a large increase in fuel consumption.
Another reason why the engine stalls is that the mesh filter in the carburetor in front of its inlet is clogged. If the car starts and stalls after a few seconds because of this filter, then it needs to be cleaned and washed. To do this, use a toothbrush and a solvent (gasoline or acetone). After this, immediately, together with the filter, clean the slot into which it is inserted.
It happens that in VAZ cars, a few seconds after starting, the speed drops due to a malfunction of the solenoid valve. The test is carried out as follows: the valve is unscrewed, power is supplied to the positive contact, and the housing is shorted to engine ground. If the valve is working properly, a distinct sound will be heard and the needle will enter the body.

You can simply connect a wire to the valve and put it in place. If you do not hear a click, the valve is faulty. We unscrew the valve and remove the jet from it. If it is bent, it needs to be replaced. Make sure that the valve shut-off needle moves freely, that the valve gasket is not torn and that it is sealed tightly against the body.

If the valve clicks, then you need to diagnose the EPH system. The idle fuel jet may need cleaning. If the car engine speed drops, its clogging can affect the stability of operation. To clean the nozzle, it is necessary to create increased vacuum in the system channels.

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

What other breakdowns of the VAZ 2107 can occur?

Another common problem that causes the engine of VAZ 2107 cars to start and stall is excess air getting into the carburetor. In this case, the fuel mixture cannot keep the engine running for a long time, and although the car starts, it stalls after a few seconds. It is necessary to determine the location of the air leak and eliminate the gap.

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

Problems with Solex carburetors

In addition to all of the above, engine speed drops if the fuel level in the carburetor (float chamber) is incorrectly adjusted. As a result, there is either not enough gasoline in the fuel mixture or too much of it. When adjusting the VAZ 2107 carburetor, it does not need to be disconnected from the engine.

Follow these steps:

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

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

What to do if it is far from normal? In this case, you need to adjust the height of each of the floats.

As we have seen, there are many reasons why the engine stalls. To start the engine correctly, you need to check and eliminate all the above faults. Afterwards, if the problem is not resolved, you will have to contact specialists.

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If the car stalls after starting the starter

What does it mean if the car refuses to slow down when you lower the gas pedal, and then suddenly stalls on its own at idle? The functioning of the throttle valve suffers, and all because it is clogged or stuck.

This option is quite acceptable if the owner of the car has used low-quality fuel more than once, the air quality in the industrial regions of Russia also leaves much to be desired, dirt impurities enter the air filter, which, being in a worn-out state and during long-term operation, simply cannot cope with dust.

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 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.

Reasons why carburetor cars start and stall

If the car starts and immediately stalls, then the problem may be due to lack of fuel in the float chamber. You can try manually pumping up the fuel pump. It must be checked for functionality and, if necessary, replaced. Before you independently clean the power system in general and the carburetor in particular, you should remember that any unconscious manipulations can lead to a large increase in fuel consumption.
Another reason why the engine stalls is that the mesh filter in the carburetor in front of its inlet is clogged. If the car starts and stalls after a few seconds because of this filter, then it needs to be cleaned and washed. To do this, use a toothbrush and a solvent (gasoline or acetone). After this, immediately, together with the filter, clean the slot into which it is inserted.
It happens that in VAZ cars, a few seconds after starting, the speed drops due to a malfunction of the solenoid valve. The test is carried out as follows: the valve is unscrewed, power is supplied to the positive contact, and the housing is shorted to engine ground. If the valve is working properly, a distinct sound will be heard and the needle will enter the body.

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 difficult to determine the exact breakdown of the idle air control (IAC) based on the readings on the on-board panel - 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:

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.
If the voltage is completely absent, you should check the entire power circuit of the mechanism and then start diagnosing the computer.
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.

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 can happen if the fuel mixture is very lean with 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 chamber;
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 completely disassembling the carburetor. This will significantly reduce cleaning time.

The fuel level in the float chamber is broken

This is a very common reason why the carburetor stalls in a VAZ 2107. This is due to improper 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.

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.

If a pressure regulator is installed on the VAZ-2107 ramp, the optimal value fluctuates around 2.5 bar, but this is only at idle without a vacuum device. With a vacuum device, a value of 3.8 to 4 bar is permissible. Spark plugs must also be checked.

How to clean the VAZ-2107 injector nozzle is shown in the video: