There is probably not a single owner of a domestic car who has never found himself in a situation in which the engine of his car refused to start. A similar problem is familiar to drivers of foreign cars, but our cars suffer from this “disease” much more often.
It often happens that the car starts and immediately stalls. There can be many reasons for this. We will talk about them in this article using the example of a VAZ-2109 car with carburetor and injection engines.
The best
look at the fuel pressure in the rail, if there is a return line, see if gasoline is flowing from it, if it doesn’t, then there is no fuel pressure in the rail,
look at the main relay, the fuel pump relay, the fuses, right the caps with it from them and look, maybe the main thing clicks for you and immediately hangs up or doesn't turn on at all,
see if the immobilizer is sewn into the firmware, flash the firmware from the ECU to the table and look, or replace it with another ECU, look for errors with a scanner,
look at the readings of the mass air flow sensor and the IAC (the latter can be checked by slightly opening the throttle valve)
There is probably not a single owner of a domestic car who has never found himself in a situation in which the engine of his car refused to start. A similar problem is familiar to drivers of foreign cars, but our cars suffer from this “disease” much more often.
It often happens that the car starts and immediately stalls. There can be many reasons for this. We will talk about them in this article using the example of a VAZ-2109 car with carburetor and injection engines.
Problems with idle speed of VAZ models 2108-09-099
VAZ cars of the “ninth” family are equipped with Solex carburetors, which differ in modifications depending on the engine size (1100, 1300 or 1500 cm³). Externally, carburetor units (CU) are almost completely identical, the difference lies in the internal “filling”: nozzles of different sections, a throttle pump atomizer (DPR), emulsion pipes, and diffusers are installed. The idle speed system (XX) in these KUs is responsible for the stability of the engine's idle speed as well as fuel consumption.
Checking the presence and condition of the spark
Determining whether voltage is being supplied to the spark plugs is not difficult. It is enough to unscrew one of them, connect the central electrode to the corresponding high-voltage wire, ensure that its “skirt” is in contact with the “ground” of the car, turn on the ignition and start the starter. If a stable blue or white-blue spark is observed on the electrodes of the spark plug, everything is in order with ignition. It wouldn’t hurt, of course, to check all the spark plugs in the same way. The fact is that very often the reason that a car starts and immediately stalls is a malfunction of one or more spark plugs.
If there is a spark on all spark plugs, pay attention to its color and size. If it is yellow or red in color, and its size is disproportionately small compared to the interelectrode gap, this may also be the reason why your car starts and immediately stalls.
We diagnose high-voltage wires
If you determine that everything is in order with the spark plugs, and the VAZ-2109 starts and immediately stalls, as before, it is worth checking the high-voltage wires. Due to the constant loads created by high voltage, they also often fail. A wire malfunction is a violation of the integrity of the current-carrying core or insulation. In the first case, electricity does not flow to the spark plug at all, as a result of which the spark disappears. If there is damage to the insulation, a breakdown occurs between the conductive core and the “ground” of the car, that is, part of the electricity simply goes away. Because of this, the spark loses power, and often the ability to ignite the fuel mixture.
High-voltage wires are checked in the same way as spark plugs. Additionally, the resistance value of the conductor is measured. Depending on the brand and model of wires, it can range from 0.4 to 0.9 kOhm.
Air leak
Engine problems are often caused by air leaks in the fuel system.
Where could there be an air leak on the VAZ 2109
Possible ventilation openings:
- Due to the deformation of the metal from which the parts are made, a fence occurs between the carburetor body and its top cover.
- Gaps between the lower platforms of the carburetor units and the intake manifold.
- Unreliable connection of hoses to fittings of the vacuum brake booster.
- Vacuum booster malfunction.
The operation of the latter can be checked simply: disconnect the vacuum hose from the intake manifold, plug the fitting and start the engine.
If the motor stops with a triplet after the plug is reinserted into the fitting, the problem was in the amplifier.
Injection engine power system sensors
Often it is a faulty mass air flow sensor that causes the injection “nine” to start and immediately stall. This sensor determines the amount of air flowing through the air duct into the intake manifold. Based on its data, the electronic control unit regulates the concentration of the fuel mixture. The slightest malfunction of the mass air flow sensor leads to its incorrect formation. As a result, we have an increase in fuel consumption, floating idle speed, and problems with starting the engine.
Well, how can we not mention the idle speed regulator (sensor). It is he who receives a signal from the electronic control unit about the required amount of air for the combustible mixture and mechanically increases or decreases its volume. The regulator is directly involved in starting the engine and its operation during the warm-up phase in idle mode. So if your car starts and immediately stalls, do not forget to check the IAC.
The engine stops working while driving or immediately after starting
It is easy to determine that the engine has stalled for the following reasons:
- When receiving a load, the engine immediately stops working (at takeoff).
- The engine stopped before it started moving.
The reasons are difficult to predict, but experts identify the most common:
- Problem with fuel supply to the carburetor.
- Ignition fault.
- The minimum is gone.
- The fuel filter is clogged.
- Exhaust gases are trapped inside the muffler.
Fuel supply problems are most often caused by the fuel pump. The VAZ-2109 starts and locks when you press the accelerator pedal before moving.
To understand the pump, you need to disconnect the central high-voltage cable, disconnect the fuel line connected to the carburetor, and temporarily run the starter. The operation of the fuel pump is ensured if fuel immediately begins to flow out of the pipe.
How can you be sure that the gases that escape freely through the exhaust system? The fact is that the car will immediately freeze if the deflector in the muffler completely closes the exhaust, and if not completely, then the car will be able to move off, but in the process there will be problems with acceleration and speed.
This hypothesis is tested as follows:
- The engine is started by the first person (it is more convenient to carry out the operation together).
- The second participant places his hand on the exhaust pipe, checking for gas leaks.
The lack of idle speed in the VAZ-2109 carburetor also leads to the car starting and stopping. The problem is widespread on cars of this brand, so it’s worth looking at it in more detail.
IAC check
To check the idle air control, we use a multimeter turned on in ohmmeter mode. Before starting diagnostics, the IAC must be disconnected from the on-board circuit. First of all, we measure the resistance between terminals A and B, after C and D. It should be within 53 Ohms. Next, we measure the resistance between A and C, B and D. Here it should tend to infinity. If the test results differ from the given values, the regulator is faulty, and, most likely, it is to blame for the fact that your car starts and immediately stalls. The reason for the failure of the IAC may be either a break in one of the windings, or wear of the cone needle guides. In any case, it is better to replace it.
Possible carburetor malfunctions
Now let's talk about the problems with starting carburetor engines of "nines". There are no sensors here that affect the operation of the power system, but this does not mean that there are fewer problems with them. If you are confident that the ignition system is working, but your car starts and immediately stalls, the carburetor is the reason. Or rather, one of its working elements is responsible for the engine idling.
It is recommended to start checking with the idle air solenoid valve. This device more often than others causes the VAZ-2109 to start and immediately stall. It does not matter which carburetor is installed on the engine.
The simplest method for diagnosing the valve is to disconnect and connect the device to the power wire with the ignition on. Clicks that occur when the positive wire is connected to the corresponding terminal indicate that the electromagnet is working properly. If the valve does not respond to the supply of electricity, you can safely throw it away. Naturally, installing a new one in its place.
After unscrewing the solenoid valve, check the condition of the idle fuel jet at the same time. If necessary, blow out and flush it with carburetor cleaning fluid. A clogged idle jet also negatively affects engine operation without load.
The leakage of excess air into the system also leads to problems with starting the power unit. As a result, the fuel mixture becomes leaner, and the engine begins to operate intermittently, losing speed and power. Check the tightness of the system at the attachment points of the vacuum tubes going to the distributor and brake booster, as well as the seat of the idle air valve.
What to do if the problem is in the ECU?
The engine may fail if the onboard vehicle does not work properly. In VAZ, only he is responsible for the timely supply of fuel, synchronizing the operation of the injector injector and spark plugs. When the engine stops immediately, it indicates a mismatch between the timing of the fuel supply and the ignition of the fuel mixture.
Usually changing the firmware or returning to the industrial state helps. Although it may simply require adjustments to the fuel cycle, as well as saturation of the consistency. In particularly difficult situations on a VAZ 2110 (or later model), you will have to replace the entire ECU unit or turn it off, putting the engine into operating mode only by a mechanic.
It should be noted that not only the ECU itself is responsible for the operation of the engine, but also a group of sensors that regulate the pressure in the injector, the saturation of the consistency and the ignition timing.
In other words, you also need to check their performance. However, if a training malfunction is detected among them, a Check Engine signal should be sent to the dashboard. This, for example, happens when starting a VAZ 2110. This happens not only in this case, if the ECU simply does not receive signals from the sensors. It is worth noting that, as a rule, a computer is not installed in the 2107 model, but the injector does not work without it.
Identical problems arise when and when the carburetor is synthetically modified to accommodate an injector, but the onboard remains the same. In a personal computer, they simply change the firmware, connect new modules, alas, you need to understand that at first it is not designed for such work. Therefore, when modifying the carburetor along with its help, it is necessary to change the ECU to a compatible model. Fantasy, VAZ took care of their release.
What is needed is if the injector starts in this case, but freezes, then the main reasons for such a malfunction are disturbances in the operation of the electronics (including the ECU), incorrect operation of the fuel, allowing for accounting (software) or actions with the filtration of gasoline. Identifying the root cause is not a problem. In the latter case, you can always contact Center 100. Alas, it is worth keeping in mind that any changes in the operation of the on-board vehicle, of course, can only be made if the engine is in good working order.
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The car starts in cold weather and immediately stalls
Low temperature can affect the stability of the engine only if the fuel pump is faulty. Are you trying to start the engine in severe frost, it starts, but after a few seconds it stalls? Try pumping fuel using the pump lever. If the situation has changed, look for a problem in the pusher. In addition to the fact that its sealing gaskets may be worn out, which, moreover, become harder in severe frost, it itself may become covered with frost. All this makes it difficult for him to move. As a result, fuel enters the carburetor in a smaller volume, which, again, leads to a leaner fuel mixture.
Air filter
Replacing filters in a car is an important maintenance procedure that many people forget about. As a result, the filter becomes clogged and the operation of the power unit and systems is disrupted. If there is severe contamination or damage, the engine will run unevenly and jerkily—it will stall when you press or release the gas pedal.
Attention! The engine stalls in the same way if the XX regulator fails.
To verify the malfunction, you need to dismantle the filter and inspect for damage. If dirty or worn, replacement is necessary.
Reasons for changes in engine operation
What to do if the VAZ injector starts and stalls at idle? This problem most of all concerns old cars, since with age various contaminants accumulate in the fuel system and in the throttle assembly, as well as sensors and mechanisms wear out - all this will inevitably lead to changes in engine operation.
We will describe in order all the reasons that lead to this problem.
- The first thing to check is the mass air flow sensor (MAF). The sensor's sensing element becomes dirty and wears out with age, which is why its resting voltage increases and its reaction time to changes in air flow increases. If the quiescent voltage exceeds 1.035V, you should think about replacing the sensor, because it will no longer be able to give inflated readings on air flow. The electronic control unit will supply more fuel and the mixture will be over-rich - and this will have a very bad effect on all engine operating modes, as well as on idle stability.
- The idle air control (IAC) can also affect the stability of the engine. Rod jamming is the most typical malfunction in it. In addition, with age, natural wear and tear occurs on the components of the regulator, and this leads to problems with movement. The usual service life is 100-150 thousand km. Only with the help of special equipment can you check the IAC, and it is better to replace it with a new one immediately if a malfunction is suspected.
- Very often it is enough to simply clean the throttle assembly from dirt. It's easy to do it yourself. These are the most basic cases that you need to pay attention to. Atypical situations will follow.
- Sometimes the problem is a leaking intake manifold. You need to check the gaskets, vacuum hoses, injector O-rings, and the vacuum brake booster and manifold plugs. The easiest way to find air leaks is with a smoke generator.
- Pay attention to fuel pressure.
- You also need to check the ignition system and spark plugs in particular.
In conclusion, it should be noted that without special equipment, a complete check of the system is impossible. Only with its help can the fault be accurately identified.
What can cause the engine injector to stall when starting a VAZ 2109
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If you turn it on for a few seconds, it doesn't freeze, but it still runs unevenly as if there wasn't enough fuel pressure.
Freedom for parrots and c105!
It looks like the ignition module is dying.
Hm. I'll try to jump tomorrow. Could this be due to air getting into the exhaust manifold gasket? just some kind of sound, a stranger appeared, like this pffff))) I somehow didn’t pay attention to it (..
Could this be due to air getting into the exhaust manifold gasket?
Freedom for parrots and c105!
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