With the onset of winter, most carburetor cars bring hassle to their owners. The carburetor VAZ 2109 is no exception, which does not start well when cold. There can be many reasons for such a launch. This article will consider the most common reasons why a carburetor VAZ 2109 does not start well on a cold one.
Before drawing any conclusions, it is necessary to make sure that the driver correctly complies with the requirements for starting a cold engine. For these purposes, carburetor engines have a manual throttle valve drive. Without using this mechanism, starting the car, especially in cold weather, is quite problematic.
You need to start the engine in the following sequence:
- Open the hood and pump up fuel with the hand pedal of the petrol pump
- Pull the choke knob towards you
- Pump gasoline into the manifold using the accelerator pedal
- Without pressing the gas pedal, start the engine
The engine may not start the first time. But the second time it should. You also need to focus on pumping gasoline with the gas pedal. The main thing here is not to overdo it, otherwise you can fill in the candles and then the engine will definitely not start. If this nevertheless happened and the car did not start, then depress the pedal all the way, turn on the starter and, while it rotates, slowly release the gas pedal.
Poorly turns the starter on a cold VAZ 2109
This is one of the most common causes of a poor fret start. There are two sides to this: the starter jams or freezes the battery. While everything is clear with the first case, the second requires special attention.
In severe frosts, it is recommended to bring the battery into the house and put it on charge, then problems with starting will be left behind. But if this is not done, then the task may become more complicated. To start, you need to turn on the dipped beam for a while - this will warm up the electrolyte. After that, you can try to turn on the starter for no more than 3 seconds. Each new attempt to start the engine must be followed by pauses of 30 seconds, 1 minute and 2 minutes. Otherwise, the battery will run out to the end and instead of a trip you will have to wait for the battery to charge.
If in the summer you can fill in oil with a lower viscosity or 20w40, then in severe frosts it freezes. It becomes very difficult to turn the crankshaft with frozen oil, so the manufacturer recommends pouring engine oils with a viscosity of 5w40 for the winter.
Another option for solving this problem is the use of pre-heaters, which are included in the 220 V network and heat the antifreeze. Due to the heat transfer of the metal parts of the VAZ 2109 engine to the carburetor, the oil becomes thinner, and the engine can work quietly even in severe frosts.
If the VAZ 2109 does not start well, not only cold, but also hot, then the problem may affect the system. An incorrect lead angle degrades the starting properties, which makes the launch problematic.
Usually, startup problems are observed with. In this case, you can see black smoke from the exhaust pipe, the electrodes of the spark plugs are covered with black carbon, and pops are heard in the muffler when the accelerator pedal is pressed. You can try turning the distributor a few degrees or adjusting the ignition from scratch. The problem should go away.
However, an angle too early results in:
- Detonation;
- Overheating of the engine;
- Depletion of the mixture.
VAZ engine power system problems
First of all, you need to check the air and fuel filters. If they are heavily contaminated, the engine will not start well when cold. The design of the nine provides for two fuel filters located under the hood and the car and one air filter. If they are intact, then we check the operation of the gas pump.
Try to manually pump gasoline. If it does not pump well, then the problem lies in the fuel pump.
Next in line is the carburetor. Incorrect adjustment can cause the car to be difficult to start when cold. Idling speed should not exceed 900 and fall below 700. Carbon deposits on spark plugs are unacceptable. Otherwise, the unit needs proper tuning.
Gas distribution mechanism
The last one is the valves. Before adjusting the carburetor, it is necessary to check the valve clearances. This is done on a cold engine, since the metal expands when heated.
Violation of the clearances will impair compression. In this case, not only power is lost, but also the starting properties of the car deteriorate.
These are the main reasons why it is difficult to start on a cold VAZ 2109. If none of these tips helped, then it is better to contact a specialist.
> In the article "" 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 the VAZ 2108 2109 21099 injector when their iron horse stops starting. Differences in troubleshooting carburetor and injection engines are very significant. So, 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 transplant it to an injector VAZ 2108, VAZ 2109, VAZ 21099, which will not start, then the person will not know what to do.
It is understandable: an electric fuel pump, an ECU, a bunch of sensors, injectors, an ignition module. Not knowing what to look in and in what order, the situation when the injection engine does not start can pretty much scare the owner of the car.
Here, as in the diagnosis of any malfunction, a clear, well-thought-out sequence of actions to identify the malfunction is important. So let's start, if the VAZ 2108 2109 21099 injector does not start, then the old rule works 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, we unscrew the candle from the cylinder, press it against the mass and turn the starter. If a spark jumps on the spark plug, then the problem is in the fuel supply system.
However, it must be remembered that if the twisted candle is wet and there is a spark, be sure to check the marks.
Mark on the camshaft gear VAZ 2109
Flywheel mark VAZ 2109
Due to the fact that the timing belt will slip one or more teeth, the valve timing will be disrupted and the VAZ 2108 2109 21099 engine will not start.
If the spark does not slip on the spark plug, then the reason may be: crankshaft position sensor (hereinafter referred to as DPKV), crankshaft pulley, ignition module, ECU.
1a) Many are very afraid of what is in the injector. Yes, it is true, incorrect operation of the sensors can very much ruin the life of the owner of the VAZ 2108 2109 21099 injector. I will tell you one important detail, from which it will immediately become easier for you: the VAZ 2109 engine will not start due to a malfunction of one single sensor - DPKV. If any other sensor is faulty, then the engine will start, only its work will be incorrect - it can triple, 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 wiring to it. The DPKV connector very often rots, since moisture and dirt can get on it from below, although the sensor itself is very reliable. If there is a suspicion that the DPKV is defective, 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. It won't start - let's 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 scroll.
Part of the VAZ 2109 pulley with teeth for DPKV fell off
Accordingly, the DPKV does not work when the crankshaft rotates and the ECU does not give a command for a spark to the spark plugs. You can simply remove the timing belt cover and visually make sure that the crankshaft pulley is spinning and is working properly. At the same time, check the integrity of the timing belt and label.
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 will start or not.
1d) If the ECU is faulty, the engine will naturally not start.
1e) Lack of contact in the wiring. All devices can be whole: 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 a connector is oxidized.
2)
If there is a spark, but the engine does not start, a check of the engine power system is necessary.
Check if fuel is supplied to the injectors:
2a) Is the fuel pump pumping?
U VAZ 2109 with injector electric fuel pump
The fuel pump VAZ 2108 2109 21099 injector is electric, it is immersed in the gas tank of the car. When the ignition is turned on, its operation should be heard. To check whether it pumps fuel or not, you can loosen one of the fuel inlet pipes, place a container under them 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 tap 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 understand whether the filter is clogged or not using a pressure gauge connected to the pressure regulator tap on the car's fuel rail.
2c) Clogged nozzles.
Dirty injectors of the injection engine
When the injectors become clogged, they either do not allow fuel to pass through at all, or the fuel enters in a smaller amount and does not spray, but drips. Due to clogged injectors, it can be difficult to start the engine of the VAZ 2108 2109 21099 injector in frosty conditions. Such a car usually does not develop its full power while driving.
2d) Fuel may not be sprayed by the injectors if they are not receiving open signals from the ECU. It is necessary to make sure that the chips are attached to the injectors and all the wires are intact.
3)
When starting a cold engine in frost, especially on injection engines VAZ 2108, VAZ 2109, VAZ 21099, a phenomenon such as slipping or shearing of the timing belt teeth often occurs. In this case, the valve timing of the engine is violated 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, go on.
4)
If the candles VAZ 2108 2109 21099 are flooded, then they need to be dried. A spark is not generated on a flooded candle. If you unscrew the candle, and it is all wet, then you need to unscrew all the rest and ignite them on gas. If they are flooded again, you need to look for the reason elsewhere.
5)
Some VAZ 2108 2109 21099 injectors cannot start in frost with an engine temperature sensor connected. Probably this is a feature of the firmware or something. Throw back the temperature sensor chip, the engine starts with difficulty, but it starts. When connected, no.
Such a feature can confuse anyone: there is a spark, and the candles are wet, and the belt has not slipped through, and the car will not start. He threw back the temperature sensor, and she started up. This situation, of course, is more the exception than the rule, but the owner of the VAZ 2109 knows better about it.
6)
Also a rare situation, but it happens. Sprinkling catalyst in the muffler of the car. In accordance with environmental requirements, a catalyst is installed in the VAZ 2108, VAZ 2109, VAZ 21099 muffler, which reduces the emission of harmful gases into the atmosphere. If this catalyst is poured inside the muffler, then exhaust gases will be difficult to exhaust and the engine will either not start at all, or it will stall. To eliminate this point, you just need to loosen the clamp between the catalyst and the muffler so that the exhaust gases come out after the resonator.
The problems described above are the most common reasons that the engine of the VAZ 2108, VAZ 2109, VAZ 21099 injector does not start, but it should be remembered that there are special cases in which only a service station can help.
On the VAZ-2109 car, initially carburetor engines were installed, and then injection ones. Regardless of which engine is on the nine, it will not start with a faulty starting system, since starter either cannot turn the crankshaft, or rotates it with insufficient frequency. The reasons for this state of affairs may be insufficiently charged accumulator battery, oxidized terminals, both on the battery terminals and on the traction relay, in which the internal contacts can also burn. Failure of the overrunning starter clutch will also lead to the fact that the engine will not start, since the crankshaft will not rotate, although the starter armature shaft will rotate.
Another malfunction that will prevent the engines of carburetor and injection nines from starting will be failure timing belt... It can simply break or, more likely, cut the teeth, and in the event of a loosening of the belt tension, it can jump a couple of teeth on the drive gear, which will lead to a violation of the valve timing and the engine will not start in this case.
If everything is in order with the timing belt and the starter, then on the VAZ-2109 carburetor engines we further check power supply system and ignition system... Testing of these systems usually begins with the presence of a spark on the spark plugs. If it is not on the spark plugs, then check if it is on the high-voltage wire coming from the ignition coil. If there is a spark in this place, you will have to check if the distributor slider is broken to ground, if the contacts of the distributor cover are burnt, and if the carbon rod that transfers voltage to the slider is not frozen. If there is no spark on the center wire, then either the ignition coil itself or the switch will be the culprit.
If there is a spark on the spark plugs, you will have to check the operation fuel pump and carburetor... We check the operation of the fuel pump by disconnecting the gas line from the carburetor and supplying fuel in manual mode. If there is no pressure or it is weak, it means that the diaphragm of the fuel pump has torn. If the pressure is strong, then you will have to remove the air filter and carburetor cover, and then blow out the jets with compressed air, and also do not forget to check the operation of the needle valve, there are cases that it sticks and then the fuel supply to the carburetor float chambers stops.
On injection engines The VAZ-2109, both ignition and fuel supply to the engine cylinders, is controlled by an electronic unit that receives information from seven sensors, and then processes it and issues appropriate commands to the injectors and ignition coils. If the crankshaft position sensor fails, the engine will not start, but in order to determine this, it is necessary to carry out diagnostics and by error codes, to identify the malfunction. The engine will not start even if the electric fuel pump fails, either due to the lack of voltage at its terminals, or due to a short circuit of its windings.
A fairly common question that covers not only VAZ 2109-2108 cars, but probably all VAZs in general, since problems with starting the engine are quite common and similar machines.
Of course, the topic is hackneyed, but you will most likely not be able to get an answer to your question why your car does not start right away. Moreover, there may be so many reasons that it will take quite a lot of time to diagnose it alone. So, below are the main reasons why your car may not start.
Fuel system malfunction
- First, look at the fuel gauge on the instrument panel. There are such drivers, usually beginners, who do not look at the devices, and will not always be able to find their way in the case when the fuel simply runs out.
- See if fuel is flowing into the system. If the car is carbureted, pump the gas pump up manually and make sure that the gas is going to the carburetor. If it is injector, listen carefully if the fuel pump is working when the ignition is turned on. If not, look for the cause, a faulty fuse, an open circuit, or something else that could lead to a similar outcome.
- The power system is clogged: it often happens that debris enters the carburetor along with the fuel, and even one clogged jet can disable the normal start of the engine.
Problems in the ignition system
- Check if there is a spark on the candles. If it is not there, then the reason is precisely in the ignition system. It is necessary to check the connection of all high-voltage wires to the module or distributor, especially for the central high-voltage wire (for a carburetor engine model).
- , if it is she who is the reason for the disappearance of the spark and the consequence of the fact that the car has stopped starting.
- Check the operability of the distributor - open the lid, look at the integrity of the coals in it. Also check contacts or.
Problems with the electrical or electronics of the injector
If your VAZ 2109-2108 is injector, then there may be much more problems for which it refused to start. There are about 5 ECM sensors alone, which can affect the normal start of the motor:
- DMRV - mass air flow sensor
- IAC - idle speed regulator
- Throttle position sensor
- Crankshaft position sensor
- Phase sensor
Also, do not lose sight of even the simplest problems, for example, with the ignition switch, starter and its retractor relay, as well as with fuses.
Will not start due to problems with the timing or piston group
If the timing belt has jumped a couple of teeth, then the engine may no longer start, since the ignition is out of order. In order to bring him back to life, it is necessary.
The valves are jammed - there is also a possibility that it is for this reason that starting the engine has become difficult and, over time, even impossible. In this case, it is necessary to produce.
Weak compression is the case when a difficult start is manifested daily, if the piston is already on the verge of complete decline. This is due to too much wear and tear of the parts of the piston group: rings, pistons and cylinders.
There is something to supplement this list, we do not hesitate - we write in the comments to the article below.
What to do if your favorite VAZ 2108, VAZ 2109, VAZ 21099 refused to start? This article will discuss the troubleshooting diagram. As you probably know, three conditions are necessary for the engine to start and work: air, gasoline, spark. When the crankshaft of the VAZ 2108, VAZ 2109, VAZ 21099 engine rotates, the combustible mixture is sucked into the cylinders (a mixture of air and gasoline in a certain proportion). After closing the intake and exhaust valves at the end of the compression stroke, a spark should appear on the spark plug, igniting the combustible mixture - the engine starts.
Consider the diagnostics for determining the malfunction along the chain. The entire methodology is shown in detail in the figure, the text provides the necessary comments on the points.
1) If the starter does not turn the crankshaft of the VAZ 2108, VAZ 2109, VAZ 21099, then we check the following: the battery must be charged, when the ignition key is turned, a click of the retractor relay should be heard, all connectors must be put on the starter.
2) If the starter turns the crankshaft. It is necessary to determine what is not entering the cylinder, a combustible mixture or a spark. First, we look for a spark. To do this, remove the high-voltage wire from any candle, bring it a centimeter to the ground and turn the starter.
3) If a spark does not go to the VAZ 2108, VAZ 2109, VAZ 21099 spark plug, check if the spark goes to the ignition distributor (distributor). To do this, remove the central wire from the distributor, bring it to a distance of 1 cm to the ground and turn the starter. If the spark slips from wire to ground - the problem is in the ignition distributor: we check the slider, clean the contacts.
4) If there is no spark to the ignition distributor, a diagnosis of the ignition system is necessary.
There are two options for further troubleshooting:
A) Using a non-contact ignition system diagnostic device.
B) Manual troubleshooting.
A) You have a device, their varieties may be different, but the principle of operation is the same: the power supply and testing of the Hall sensor and the switch are displayed by light bulbs.
The device is connected to the open circuit of the switch. Remove the connector from the switch and connect to the instrument connector. Put the second connector of the device on the commutator. Turn on the ignition: the ignition system power light and the Hall sensor power light should be on.
When the starter rotates, the VAZ 2108, VAZ 2109, VAZ 21099 should blink: the switch control light, the pulse light from the Hall sensor.
If the switch control light does not blink, replace the switch.
If there are no pulses from the Hall sensor, disassemble the ignition distributor, make sure that the distributor slider rotates when the starter rotates. If the starter is spinning, but the distributor slider is not, the timing belt is torn. If the slider turns, but there is no signal from the Hall sensor, replace the Hall sensor.
B) A variant of troubleshooting without an ignition diagnostic device VAZ 2108, VAZ 2109, VAZ 21099. Disassemble the ignition distributor and make sure that the distributor slider rotates when the starter rotates. If it does not spin, the timing belt is torn. If the slider turns, check that the distributor drum does not touch the Hall sensor. Make sure the wires and the Hall sensor connector are in good condition. If everything is normal, change the switch, the most common reason when there is no spark is the switch burned out. If, after replacing the switch, a spark does not appear, suspicion falls on the ignition coil and connecting wires. The ignition coil (according to the popular babin) breaks down extremely rarely, but such cases also happen.
Ignition coil
5) If there is a spark, but the engine will not start, remove the air filter cover.
Is the filter clean, not filled with oil? We are trying to start a VAZ 2108, VAZ 2109, VAZ 21099 without an air filter cover, it starts up - it means there is no air access to the carburetor, the filter is clogged, the air supply is clogged, the filter is filled with oil.
6) Does not start - completely remove the filter with a cover and unscrew the fuel hose from the fuel pump to the carburetor from the carburetor side. We turn the starter - gasoline should spray. Doesn't it splash? Either the fuel pump is out of order, or fuel is not supplied from the tank, if it is there of course.
7) If gasoline splashes when turning the starter - unscrew the fuel return hose from the carburetor. Plug the return line with your finger, and blow your mouth into the feed. Is the air flowing into the float chamber? If so, then the gasoline also passes, it is necessary to blow out the entire carburetor with compressed air.
8) Does air not pass into the float chamber? We check the carburetor mesh filter. We unscrew it, clean it. Did not help? - The needle valve may be stuck. Tap on the side of the carburetor with a wrench or blow into the supply port with compressed air.
9) If you still cannot blow air into the float chamber, remove the carburetor cover, take it in your hands and try to blow again. Air does not pass - we change the needle valve.
10) If, when the cover is removed, air passes through, but when it is clamped on the carburetor, the fuel jets are not clogged. A complete purge of the carburetor is required.
11) If, after the work done, the car still does not start, unscrew the candles.
Look if they are filled with gasoline or not? If they are filled, they must be dried. We turn on the gas stove and, holding with pliers, dry the candle over the fire. If the candles are still dry, you can try to sprinkle a few drops of gasoline into 1 chamber of the carburetor (closer to the cabin). It can pierce the carburetor with the resulting vacuum and the engine will start.
The techniques described above will help to start Vaz 2108, Vaz 2109, Vaz 21099 in more than 90% of cases. However, in case of difficult-to-diagnose problems (not a few teeth slipped through the timing belt, bad or missing compression in the engine, the carburetor is not adjusted) you can only be helped at the service station.
