Causes of malfunction
Structurally, it turned out that the VAZ 2109 injector engine is a modified version of the 2108 carburetor power unit. The engine has four cylinders and eight valves.
The design of the motor is quite simple, which allows you to diagnose and repair the engine yourself. Before moving directly to the consideration of the repair issue, it is worth determining what reasons could cause such a malfunction, such as failure to gain momentum. So, let's look at the main causes of the malfunction:
Diagnostics of the fuel supply system to the engine
You should check the presence of the required amount of fuel in the gas tank. An insufficient amount of it can affect further diagnostics, since a small volume of gasoline will not allow the gas pump to receive the required amount. All diagnostics should be carried out with a full gas tank.
You need to pay attention to:
You should start checking with the pump, as this is very easy to do. It is necessary to disconnect the fuel hose from the engine and turn the starter.
The pump operates if there is fuel supply. Diagnostics can be done without starting the engine. To do this, you need to press the lever on the pump itself. A few presses are enough to create the necessary pressure.
If gasoline does not begin to pump after pumping, the pump should be replaced with a new one. There is no particular point in restoring the pump, since this component has a low price. Around 500-1500 rub.
The next step will be diagnosing the carburetor. It is not possible to do this alone. Therefore, you should ask someone to help.
With the found assistant, you need to do the following:
Gasoline must flow into the manifold. If everything is so, then the system is working properly. If not, then the carburetor is broken.
In this case, you need to clean the idle air valve on the carburetor. This valve looks like a “bar” and is located on the side. It must be unscrewed and checked for dirt. The valve must be cleaned with a needle or other thin object.
If a VAZ 2109 with a carburetor does not start the first time, then the defect is clearly in the carburetor jets.
For complete cleaning you will need a special liquid and a compressor. It is also necessary to correctly configure the carburetor itself. It is very difficult to do this yourself if you do not have the proper experience.
If the VAZ 2109 has an injector and the engine does not start, then the injectors should be checked. First of all, you should check the presence of power with a multimeter. To do this, you need to measure the voltage at the contacts that are connected to the injector. If there is no voltage, then it is necessary to check the cable.
If a VAZ 2109 does not start on an injector or carburetor in winter, then one of the reasons may be the thickening of the oil in the cylinders. Because of this, the compression force drops and the engine is unable to convert the mixture. In winter, oil flows down in the cylinder from top to bottom. And when trying to start the engine, fuel flows onto the cylinders from above, which dissolves the oil and washes it away from the cylinder walls.
Elimination methods
The main reason that the engine may not gain speed is the formation of an air-fuel mixture. So, the engine does not receive the correct ratio of gasoline and air, which affects the operation of the power unit and the burning mixture does not sufficiently spin the crankshaft, which drives the wheels.
Let's look at the basic diagnostic operations and repair methods.
Bad "fuel"
First of all, it is necessary to understand what quality of gasoline is poured into the system and whether it is possible for it to burn correctly and completely. This will determine not only whether the crankshaft can spin up, but also whether the power system is clogged.
Typically, the main indicator of gasoline quality is the condition of the fuel filter. If it clogs too often, it is recommended to change the fuel supplier. To fix the problem, it is necessary to clean the entire fuel supply system, from the fuel tank to the injectors. Also, it is worth diagnosing and cleaning the piston group, where most likely the pistons already have carbon deposits.
Ignition system malfunctions
More than once, the reason that the engine does not pick up speed well has been the ignition unit. Failure of spark plugs or high-voltage wires is a direct sign of problems of various types. Carrying out diagnostic operations is quite simple. The spark plugs are unscrewed and inspected for cracks and carbon deposits.
If there is no visible damage, then it is worth checking the performance on a special spark plug stand. If inoperative spark plugs are found, it is recommended to change them, first setting the gap.
High-voltage wires are removed from the vehicle and checked using a tester. If the resistance is more or less than 5 ohms, then this is the reason.
It is worth considering the fact that high-voltage wires must be replaced in sets.
Formation of the air-fuel mixture
To form an air-fuel mixture, two things are needed - fuel and air. In this context, a blockage in one of the systems will lead to the combustible mixture being formed incorrectly, which will affect the operation of the power unit.
As for the clogging of the injection system, it is often the injectors. Usually, to cure a malfunction, it is enough to simply clean the elements, but not always. It happens that the injectors are too clogged and the elements will need to be replaced. Many car enthusiasts do not know that this part is dismountable and it is enough to change the nozzles, which have a much lower price.
Clogging of the air supply system occurs when the unit is not maintained in a timely manner. The first place to look is the air filter. In this context, not enough air enters the engine cylinders, which leads to incomplete combustion of gasoline, kinetics that are not enough to put enough pressure on the pistons and spin the crankshaft.
VAZ-2109 does not start - what to do?
In general, diagnosing malfunctions of the controller (computer) and control system sensors, as well as the VAZ-2109 injector itself, is not much different from similar work for other cars. But due to the peculiarities of the “nine” control system, experienced owners of this car recommend the following solutions.
Most often, the injection “nine” does not start in winter. In this case, it is advisable to warm up and even recharge the battery - perhaps due to loss of capacity due to low temperature, it is not able to spin the engine shaft well.
Another “folk” method that helps is supplying air to the engine filter through a hairdryer. At the same time, heated air will flow into the cylinders. Many people claim that the VAZ starts right away.
Another possible reason: as a result of prolonged unsuccessful attempts to start, the spark plugs were filled with gasoline. In this case, it is recommended to try to start the car with the gas pedal pressed all the way to the floor - the spark plugs should dry out and the car will start. If this does not help, then unscrew the spark plugs and check for the presence of a spark. If it is not there, then either the spark plugs or the ignition system are faulty.
Starting the injection engine of VAZ 2108, 2109, 21099 cars in cold weather
When cold weather sets in, the injection engine of VAZ 2108, 2109, 21099 cars should confidently start up to minus 30 degrees Celsius. But this is subject to certain conditions. For example, a fresh and well-charged battery, new spark plugs, a working coolant temperature sensor and the use of semi-synthetic or synthetic motor oil in the engine. Therefore, it is worth taking care of this minimum in advance, before the onset of frost.
Let's consider a situation where you need to start the fuel-injected engine of a VAZ 2108, 2109, 21099 car that has been parked on the street all night at a temperature below minus twenty.
Starting the injection engine of VAZ 2108, 2109, 21099 cars in cold weather
— Turn on the low beam headlights for 10 - 12 seconds to revive the battery
— Press the clutch pedal five to seven times and hold it down
After starting, we do not release it immediately, but when the engine speed becomes stable.
We do not touch the gas pedal. On injection engines, there is no point in pressing it before starting the engine, since there is no accelerator pump from which fuel would enter the intake manifold.
— We start the engine, rotating its crankshaft with the starter until flashes appear in the cylinders
Spin as long as possible, but no more than 15 seconds.
In most cases, this is enough to start the car engine in cold weather.
If it doesn’t work, you can try again in a couple of minutes, when the battery comes to its senses.
— When restarting, lightly press the gas pedal while turning the crankshaft with the starter
The control unit monitors the position of the throttle valve, and if it is slightly open, it further enriches the fuel mixture, increasing the duration of fuel injection by the injectors. This should make starting easier.
You should not make more than three attempts to start the engine at once. Most likely the candles will be flooded. If the remaining battery charge allows, you should fully press the gas pedal and crank the starter for another 10 - 15 seconds. When the throttle is fully open, the engine cylinders are purged. Fuel is not injected at this moment. After purging, after some time you can repeat the start. Otherwise, it is worth replacing the spark plugs with dry ones.
Notes and additions
— A car that is used daily is much easier to start in cold weather than one that is driven occasionally.
— A car that has been parked overnight, at least under a canopy or other place not blown by the wind, is easier to start in the cold.
Electrical wiring problems
Listen to whether the fuel pump is running when the ignition is turned on. If there is no characteristic sound, then check the fuses on the VAZ 21093 (injector). Namely, the one that is responsible for supplying power to the fuel pump and its electromagnetic relay. It would also be a good idea to check the presence of power to all sensors in the system. Check all vehicle wiring for breaks. But if everything is in order, and the car does not start, then most likely there is a glitch in the software installed in the ECU. In this case, you will have to contact a service station for a complete diagnosis and firmware update of the microcontroller.
Fuel system malfunction
- The simple reason is a breakdown of the fuel level indicator on the instrument panel. It’s worth checking it first, perhaps you just ran out of gas, and the indicator indicated the opposite;
- Another breakdown may be the fuel pump. In a carburetor car this pump is of a mechanical type and can be checked manually. In an injection engine, the pump is electric and problems can be heard when the ignition is turned on. You can also connect a pressure gauge to check the pressure supply;
- the jets are clogged. This problem is present in cars with carburetor engines. In this case, you can clean the carburetor with a car pump and set the gasoline level in the float chamber. The fuel injectors in the injection engine become clogged. In this case, the fuel is not injected as expected, but drips;
- A clogged fuel filter will prevent the engine from starting. Some motorists often forget to regularly replace this element. As a result, problems with engine operation occur.
Injectors: diagnostics
When it has been determined that there is a spark between the electrodes (and it is bright blue), the gaps are normal, but the engine still does not start, you need to check the injectors. These are devices that inject a fuel-air mixture into the combustion chambers of each engine cylinder. If the VAZ 21093 engine (injector) does not start, the likelihood that the injectors are malfunctioning is extremely high.
To check the fuel injectors, you will need to have diagnostic equipment. But this is for an accurate check. To, as they say, “by eye” determine serviceability, you can remove the nozzle and connect it to the power supply. The ideal form of spraying the air-fuel mixture is a cone-shaped torch. And if fuel flows or drips with difficulty from the nozzle, we can say that contamination has occurred. Cleaning the spray nozzles will help you in this case.
Operating principle
The quantity and quality of the fuel mixture in the injector is controlled electronically. Sensors are located throughout the engine unit, the signals from which are intercepted from the microprocessor and converted to the fuel supply system. The same processor controls the mixture ignition system in the combustion chamber
If any sensor malfunctions, the output control pulse ceases to correspond to the parameters of the normal functioning of the engine, and it refuses to work, in other words, it does not start.
Candles
First of all, find out if there is a spark at all. The weakness of the latter allows you to start the engine while it remains hot, but it does not work when it is cold.
Unscrew the spark plug, place it against ground and crank the starter. If there is a spark, then there is probably a problem in the fuel system. We will tell you about it later.
It is necessary to do otherwise when the unscrewed spark plug works properly, but it turns out to be wet. Here you should check the timing belt. The latter sometimes jumps off, which disrupts the correct gas distribution and, accordingly, the VAZ engine does not want to start.
If you see that the spark plugs are filled with fuel, then perhaps this very circumstance is preventing you from starting the engine. Dry them with a burner or on a gas stove burner. When they turn out to be wet again during the next attempt, you will have to find out why this happened.
If there is no spark, the cause is sought further. It often lies in problems:
In most cases, the VAZ model 2109 injector does not want to start precisely because of the failure of the DPKV. Failure of other sensors does not prevent the engine from starting, it will simply not work correctly.
First, check whether the connector leading to it is intact and whether the wires are in good condition. It is the destruction or contamination of these elements that most often interferes with the normal operation of the DPKV, while the device itself is reliable.
To test the sensor, just hold a piece of metal close to it and measure the output voltage. It will fall if the piece of iron is taken away, and rise when it is brought close.
Another reason why a VAZ may not start is the crankshaft pulley. The disadvantage of this unit is that its teeth are partially made of rubber, which means they can come off or even scroll. This affects the sensor readings, and the computer, guided by them, does not want to supply voltage to the spark plugs. It’s not difficult to check - remove the casing from the timing belt (inspect it at the same time), and then examine the pulley.
Spark plug malfunction
Flooded spark plugs can cause malfunctions. They can be removed with a special spark plug wrench. This must be done extremely carefully, without damaging the spark plug connectors. Next, the spark plugs can be checked with a special device. It can be purchased for a small amount. If there are traces of deposits on the spark plugs, they are filled with fuel or dirt has accumulated, then the spark plug will not be able to produce the spark necessary for ignition. It is necessary to check for the presence of a spark. You need to unscrew the candle and place a candle holder on it. Next, you need to position the spark plug over the engine so that its body touches its block and crank the starter.
Malfunction of spark plugs: 1. Everything is fine; 2. A lot of gasoline is pouring; 3. Little gasoline flows; 4. Bad gasoline; 5. Long downtime; Your potty doesn't work; 7. The candle broke.; 8. The piston has failed.
Then the following situations are possible:
Flooded candles can be dried without a spark plug wrench. You need to turn on the ignition and put the VAZ 2109 in neutral gear. Next, press hard on the gas and crank the starter for 6-7 seconds. During this procedure, significantly more air penetrates into the cylinders than during normal operation of the cylinders, and the spark plugs in them are well dried from gasoline residues. It is worth knowing that during this operation the layer of oil on the cylinder walls becomes smaller. For this reason, it is not recommended to repeat such drying of spark plugs often, so that the engine does not run dry.
In a situation where the VAZ 2109 engine does not start when hot, the problem is most likely due to non-working spark plugs. Spark plugs should be changed every 10,000 km.
It can be difficult to identify the root cause of an engine that does not start on a VAZ 2109 engine, no matter whether it is an injector or a carburetor. If the defect is serious, it is recommended to take the car to a service center.
Fuel system
If there is a spark in a carburetor or injection engine, it should be assumed that the car does not start due to problems in the fuel supply system.
First make sure that gasoline is flowing into the injectors. If not, then look at the VAZ fuel pump. It is equipped with an electric motor and is located directly in the tank. Normally, when the ignition is activated, it starts to make noise.
It is advisable to find out whether the pressure in the ramp is normal. Measure it with a pressure gauge - there is a special fitting for it. Connect the device to it - if the reading is 4 atmospheres, then everything is in order. Low pressure appears due to a clogged fuel filter; this element will have to be removed and cleaned.
If there is no positive result, move on to the injectors. When they become clogged, gasoline either stops flowing altogether or its volume noticeably decreases. Moreover, it does not spray, but only drips. This problem does not make itself felt while the engine is hot. In frosty weather, the car, even if it starts moving, will still not be able to develop normal power.
In addition, fuel atomization does not occur when the computer does not open the injectors. Make sure they have all the wires and are securely attached.
In winter, a Lada, which has a carburetor or injector installed on its engine, faces another problem. When cold, the timing belt teeth slip or shear, preventing the engine from achieving proper valve timing. Accordingly, it won’t start.
To check, remove the timing cover and inspect the marks installed on the camshaft and flywheel. If they are in the correct position, then the cause must be sought further.
Ignition system malfunction
- If there is no spark when you turn on the starter, there may be a problem with the wiring. To do this, you can check the integrity of the wires with a multimeter or a special indicator.
- Ignition coil. You can check the coil for malfunction if you bring the central wire at a distance to the engine. If a spark runs between the contacts, then the coil is working.
- Distributor malfunction. A frequent breakdown can be cracks on the distributor runner and it does not produce a spark to the spark plugs (it hits ground). The fault can only be checked by replacing the slider with a new one. A black coating may also appear on the distribution cap. In this case, it needs to be cleaned.
- The capacitor is broken - this problem concerns a carburetor engine. The main sign here will be the presence of a weak spark or its complete absence. In this case, the presence of a problem is checked with a test lamp, to which the wires from the ignition coil and the capacitor wires from the distributor are connected.
Battery diagnostics
If the car is parked for a long time, the battery loses charge and loses voltage. The voltage sags so that ignition simply does not occur. You can diagnose the battery using a multimeter.
The voltage should be 12.6 V. If the output voltage is less than this value, then this indicates a problem with the battery. A desirable action would be to check the density of the electrolyte. It is worth checking absolutely all contacts. First of all, you need to check them with a multimeter on the starter.
In an urgent case, when the VAZ 2109 needs to be started and started immediately, you need to turn on the headlights, thereby increasing the voltage on the battery. This activates the battery electrolyte.
In the case when the VAZ 2109 does not start on the injector, even with a charged battery. The reason may be in its terminals. It is worth checking for oxidation on them. This is why the VAZ 2109 does not start on the injector. A white coating forms on the terminals; it needs to be cleaned off with sandpaper.
Battery fault
If the car has been parked for about two weeks and it was a cold season, it is worth checking the battery. To do this, you need to measure the density of the electrolyte in the battery with a hydrometer. The density should be 1.25-1.27 g/cm3.
If the density is below the specified value, charge the battery (check the electrolyte level). Then recheck the electrolyte density. If the density has not increased, it must be raised with electrolyte from 1.27 to 1.29 g/cm3. When the density has been restored, the battery must be returned to its place and lubricated with technical petroleum jelly to prevent oxidation of the terminals.
Muffler
Sometimes an injection car does not want to start due to shedding of the catalyst in the muffler. It serves to reduce harmful emissions and is installed in accordance with current environmental legislation on all cars.
When the catalyst crumbles, the gases cannot escape normally, which means that the car will not move, since the computer will not allow it to start. It is not difficult to check this possibility - unscrew the muffler mount so that the exhaust comes directly from the resonator. If this helps, then change the catalyst.
Source
VAZ 21099 catches but the injector does not start
In the article “VAZ 2109 will not start,” we examined in detail the reasons why the VAZ 2108, VAZ 2109, VAZ 21099 carburetor does not start . However, injection VAZ 2109 have their own characteristics, so this article is intended to help the owners of a VAZ 2108 2109 21099 injector when their iron horse stops starting. The differences in troubleshooting for carburetor and injection engines are very significant. Thus, the owner of a carburetor VAZ 2108, VAZ 2109, VAZ 21099 can, with his eyes closed, determine why his car does not start. However, if you transfer him to an injection VAZ 2108, VAZ 2109, VAZ 21099, which does not start, then the person will not know what to do. It’s understandable: an electric fuel pump, an ECU, a bunch of sensors, injectors, an ignition module. Without knowing what and in what order to look, a situation where an injection engine does not start can quite frighten the car owner. Here, as in diagnosing any malfunction, a clear, well-thought-out sequence of actions to identify the malfunction is important. So let's start, if the engine VAZ 2108 2109 21099 injector does not start, then the old rule applies here: “Either there is nothing to burn, or there is nothing to ignite.” That is, either there is no spark, or the combustible mixture does not enter the engine cylinders. 1) Check if there is a spark. To do this, unscrew the spark plug from the cylinder, press it against the ground and turn the starter. If the spark jumps at the spark plug, then the problem is in the fuel supply system. However, we must remember that if the unscrewed spark plug is wet and there is a spark, be sure to check the timing belt marks.
Mark on the camshaft gear VAZ 2109
Mark on the flywheel of VAZ 2109
Due to the fact that the timing belt slips one or more teeth, the valve timing will be disrupted and the VAZ 2108 2109 21099 injector engine will not start. If the spark does not jump at the spark plug, then the cause may be: the crankshaft position sensor (hereinafter referred to as DPKV), the crankshaft pulley, the ignition module, the ECU. 1a) Many people are very afraid of the fact that there are many sensors in the injector. Yes, it’s true, incorrect operation of the sensors can greatly ruin the life of the owner of a VAZ 2108 2109 21099 injector. I’ll tell you one important detail that will immediately make you feel better: the VAZ 2109 engine will not start due to a malfunction of one single sensor - the DPKV. If any other sensor is faulty, the engine will start, but its operation will be incorrect - it may stall, not develop power, increase fuel consumption, but it must start. So, we check the DPKV VAZ 2108, VAZ 2109, VAZ 21099, the integrity of its connector and the wiring to it. Very often the DPKV connector rots, since moisture and dirt can get into it from below, although the sensor itself is very reliable. If there is a suspicion that the DPCV is faulty, it can be removed and easily checked. Apply power to it from the battery and bring metal to its working area. When the metal approaches, the output voltage of the sensor should increase; when the metal is removed, the output voltage of the DPKV should be close to zero. If the DPKV is faulty, we change it and try to start it. If it doesn’t start, we move on. 1b) Crankshaft pulley. What could be the problem here? The problem is that part of the pulley with teeth on the DPKV is rubber, and it can either fall off or spin.
Part of the VAZ 2109 pulley with teeth for DPKV fell off
The VAZ 2109 with an injector has an electric fuel pump
The fuel pump VAZ 2108 2109 21099 injector is electric, it is immersed in the car’s gas tank. When the ignition is turned on, its operation should be heard. To check whether it is pumping fuel or not, you can loosen one of the fuel supply pipes, place a container under it and turn on the ignition - gasoline should flow from the pipe. The pressure in the fuel rail of a VAZ 2109 with an injector can also be measured using a conventional pressure gauge. The pressure regulator installed on the fuel rail has a special outlet for connecting a pressure gauge. We connect the pressure gauge and look at the pressure in the fuel line. It should be about 4 atmospheres. If the pressure gauge does not show pressure, then the fuel pump is not working. 2b) If the fuel filter is clogged, the pump will not be able to provide the required fuel supply to the vehicle injectors.
Fuel filter VAZ 2109
Again, you can tell whether the filter is clogged or not using a pressure gauge connected to the tap of the pressure regulator on the car’s fuel rail. 2c) Clogged injectors.
Dirty injection engine injectors
When the injectors become clogged, they either do not allow fuel to pass through at all, or the fuel flows in in smaller quantities and does not spray, but drips. Due to clogged injectors, it may be difficult to start the VAZ 2108 2109 21099 injector engine in cold weather. Such a car usually does not develop full power while driving. 2d) Fuel may not be sprayed by the injectors if they do not receive opening signals from the ECU. You need to make sure that the chips are installed on the injectors and that all wires are intact. 3) When starting a cold engine in cold weather, especially on injection engines VAZ 2108, VAZ 2109, VAZ 21099, a phenomenon such as slipping or cutting off the teeth of the timing belt often occurs. In this case, the valve timing of the engine is disrupted and it cannot start. To make sure that the timing belt has not slipped, you need to remove the belt cover and check the marks on the camshaft wheel and on the flywheel shaft. If everything is in order, we move on. 4) If the spark plugs VAZ 2108 2109 21099 are flooded, then they need to be dried. A spark does not form on a flooded spark plug. If you unscrew a spark plug and it is all wet, then you need to unscrew all the others and calcine them on gas. If they are flooded again, you need to look for the cause elsewhere. 5) Some VAZ 2108 2109 21099 injectors cannot start in cold weather with the engine temperature sensor connected. This is probably a feature of the firmware or something else. You remove the temperature sensor chip, the engine starts with difficulty, but it starts. When connected - no. This feature can confuse anyone: there is a spark, and the spark plugs are wet, and the belt has not slipped, but the car will not start. I removed the temperature sensor and it started. This situation, of course, is the exception rather than the rule, but it is better for the owner of the VAZ 2109 to know about it. 6) Also a rare situation, but it happens. Shedding of the catalyst in the car muffler. In accordance with environmental requirements, a catalyst is installed in the muffler of VAZ 2108, VAZ 2109, VAZ 21099, which reduces emissions of harmful gases into the atmosphere. If this catalyst crumbles inside the muffler, the exhaust gases will be difficult to exhaust and the engine will either not start at all or will stall. To eliminate this point, you simply need to loosen the fastening clamp between the catalyst and the muffler so that the exhaust gases exit after the resonator.
The problems described above are the most common reasons why the VAZ 2108, VAZ 2109, VAZ 21099 injector engine does not start, but you should remember that there are special cases in which only a service station can help.
VAZ 2109 injector does not start
Injection Zhiguli models have their own characteristics; the differences in troubleshooting for carburetor and injection engines are very significant. Thus, the owner of a carburetor engine can, with his eyes closed, determine why his car does not start. However, if you transfer him to a fuel-injected car that does not start, then the person will not know what to do. It’s understandable: an electric fuel pump, an ECU, a bunch of sensors, injectors, an ignition module. Without knowing what and in what order to look, a situation where an injection engine does not start can quite frighten the car owner. Here, as in diagnosing any malfunction, a clear, well-thought-out sequence of actions to identify the malfunction is important. So let's start, if the engine VAZ 2108 2109 21099 injector does not start, then the old rule applies here: “Either there is nothing to burn, or there is nothing to ignite.” That is, either there is no spark, or the combustible mixture does not enter the engine cylinders. 1) Check if there is a spark. To do this, unscrew the spark plug from the cylinder, press it against the ground and turn the starter. If the spark jumps at the spark plug, then the problem is in the fuel supply system. However, we must remember that if the unscrewed spark plug is wet and there is a spark, be sure to check the timing belt marks.
Mark on the camshaft gear
If the timing belt slips one or more teeth, the valve timing will be disrupted and the engine will not start. If the spark does not jump at the spark plug, then the cause may be: the crankshaft position sensor (hereinafter referred to as DPKV), the crankshaft pulley, the ignition module, the ECU. 1a) Many people are very afraid of the fact that there are many sensors in the injector. Yes, it’s true, incorrect operation of sensors can greatly ruin the life of the owner of this car. I’ll tell you one important detail that will immediately make you feel better: the VAZ 2109 engine will not start due to a malfunction of one single sensor - the DPKV. If any other sensor is faulty, the engine will start, but its operation will be incorrect - it may stall, not develop power, increase fuel consumption, but it must start. So, we check the DPKV, the integrity of its connector and the wiring to it. Very often the DPKV connector rots, since moisture and dirt can get into it from below, although the sensor itself is very reliable. If there is a suspicion that the DPCV is faulty, it can be removed and easily checked. Apply power to it from the battery and bring metal to its working area. When the metal approaches, the output voltage of the sensor should increase; when the metal is removed, the output voltage of the DPKV should be close to zero. If the DPKV is faulty, we change it and try to start it. If it doesn’t start, we move on. 1b) Crankshaft pulley. What could be the problem here? The problem is that part of the pulley with teeth on the DPKV is rubber, and it can either fall off or spin.
Part of the pulley with teeth for DPKV fell off
Accordingly, the DPKV does not operate when the crankshaft rotates and the ECU does not issue a spark command to the spark plugs. You can simply remove the timing belt cover and visually verify that the crankshaft pulley is spinning and is in good working order. At the same time, check the integrity of the timing belt and timing marks. 1c) The reason that there is no spark may be a malfunction of the ignition module. It is also necessary to check the connector on the ignition module for its integrity. If possible, you can take the ignition module from another car and check whether the engine starts or not. 1d) If the ECU is faulty, the engine will naturally not start. 1e) Lack of contact in the electrical wiring. All devices may be intact: the ECU, the ignition module and all the sensors. But there will be no contact between them in the wiring, for example, a wire is torn off or the connector is oxidized. 2) If there is a spark, but the engine does not start, it is necessary to check the engine power system. We check whether fuel is supplied to the injectors: 2a) Is the fuel pump pumping?
The VAZ 2109 with an injector has an electric fuel pump
The fuel pump on the injector is electric, it is immersed in the car’s gas tank. When the ignition is turned on, its operation should be heard. To check whether it is pumping fuel or not, you can loosen one of the fuel supply pipes, place a container under it and turn on the ignition - gasoline should flow from the pipe. The pressure in the fuel rail of a car with an injector can also be measured using a conventional pressure gauge. The pressure regulator installed on the fuel rail has a special outlet for connecting a pressure gauge. We connect the pressure gauge and look at the pressure in the fuel line. It should be about 4 atmospheres. If the pressure gauge does not show pressure, then the fuel pump is not working. 2b) If the fuel filter is clogged, the pump will not be able to provide the required fuel supply to the vehicle injectors.
Again, you can tell whether the filter is clogged or not using a pressure gauge connected to the tap of the pressure regulator on the car’s fuel rail. 2c) Clogged injectors.
Dirty injection engine injectors
When the injectors become clogged, they either do not allow fuel to pass through at all, or the fuel flows in in smaller quantities and does not spray, but drips. Due to clogged injectors, it may be difficult to start the engine in cold weather. Such a car usually does not develop full power while driving. 2d) Fuel may not be sprayed by the injectors if they do not receive opening signals from the ECU. You need to make sure that the chips are installed on the injectors and that all wires are intact. 3) When starting a cold engine in cold weather, especially on VAZ injection engines, a phenomenon such as slipping or shearing of the timing belt teeth often occurs. In this case, the valve timing of the engine is disrupted and it cannot start. To make sure that the timing belt has not slipped, you need to remove the belt cover and check the marks on the camshaft wheel and on the flywheel shaft. If everything is in order, we move on. 4) If the candles are flooded, they need to be dried. A spark does not form on a flooded spark plug. If you unscrew a spark plug and it is all wet, then you need to unscrew all the others and calcine them on gas. If they are flooded again, you need to look for the cause elsewhere. 5) Some engines with an injection system cannot start in cold weather with an engine temperature sensor connected. This is probably a feature of the firmware or something else. You remove the temperature sensor chip, the engine starts with difficulty, but it starts. When connected - no. This feature can confuse anyone: there is a spark, and the spark plugs are wet, and the belt has not slipped, but the car will not start. I removed the temperature sensor and it started. This situation is, of course, the exception rather than the rule, but it is better for the owner of the nine to know about it. 6) Also a rare situation, but it happens. Shedding of the catalyst in the car muffler. In accordance with environmental requirements, a catalyst is installed in the Lada muffler with an injector, which reduces emissions of harmful gases into the atmosphere. If this catalyst crumbles inside the muffler, then the exhaust gases will be difficult to exhaust and the engine will either not start at all or will stall. To eliminate this point, you simply need to loosen the fastening clamp between the catalyst and the muffler so that the exhaust gases exit after the resonator.
