DIY carburetor 21083 repair

In detail: DIY carburetor 21083 repair from a real master for the site my.housecope.com.

For a long time, front-wheel drive cars VAZ 2108-09-099 were equipped with carburetor engines, and only closer to the beginning of the 2000s, an injection fuel system began to be installed on VAZ cars.

This article will consider the Solex 21083 carburetor: device, adjustment, unit setting, its features, as well as basic malfunctions.

Carburetors of the "Solex" type began to be used on Russian (Soviet) cars from the mid-80s of the last century, at first they were installed on the VAZ-2108 car. The first carburetors were designed to work with engines of 1100 and 1300 cm³, and they were marked DAAZ-2108. Later, the Solex 21083 model was developed, and the digital index means that the device is intended for installation on VAZ-21083 engines with a volume of 1.5 liters.

The carburetor is used to prepare the fuel mixture, on which the engine operates, and ensures uninterrupted stable operation of the power unit at any speed and load. Solex-21083 consists of the following main parts:

the main body, which contains the diffusers, the main dosing system (GDS), the idle system, the economizer and the accelerating pump;
covers with an air damper, floats, an electromagnetic valve, a cold engine starting device.

The Solex carburetor is a two-chamber one, the GDS fuel jets are located in the middle of the chambers in the very depths of the main body, and the GDS air jets are installed on top of them. The Solex 21083 carburetor device provides a heating unit for the air-fuel mixture, to which the hoses of the cooling system are connected. The throttle valves are located at the bottom of the main body and open sequentially, the opening of the damper in the second chamber is provided by the drive levers.

Video (click to play).

There are two branch pipes in the lid - one of them is designed to supply fuel to the carburetor, the second is reverse and serves to return excess fuel to the gas tank, also due to the "return" the pressure in the fuel system is reduced.

For 21083 carburetors, the industry provides repair kits, which include GDS fuel and air jets for the primary and secondary chambers. Depending on the size of the cross-section of the diffusers, there are different repair kits designed to work with engines 2108, 21081 or 21083, therefore the jets in the sets have a different cross-section.

Often, VAZ carburetors are installed on other brands of cars (for example, UAZ, Volga GAZ-31029/3110), and if you leave the "native" GDS jets, then their section will not be enough, since the air-fuel mixture will enter the cylinders in the wrong proportion and the amount that the engine requires.

Often, to improve the acceleration and dynamics of the car, some motorists put fuel jets of a larger cross section, but it should be borne in mind that in this case, fuel consumption can increase significantly, and the experiment with the installation does not always give the desired results. The most correct decision is not to experiment, and install the repair kit in the carburetor that is designed specifically for this carburetor brand (for example, for a 1.5 liter engine, jets intended for model 21083 should be installed).

If the dynamics of the engine does not suit you, you should look for the reasons for the sluggish acceleration of the car, and there can be quite a lot of them:

weak compression in the cylinders;
the ignition is not adjusted;
spark plugs do not work well;
break through high-voltage wires.

There are many more different reasons due to which engine power is lost.The opinions of car owners about tuning the carburetor are different, but practice still shows that it is better to put the carburetor recommended by the manufacturer on the car.

At one time, on GAZ-31029 or 3110, in order to save fuel, the owners of these cars often set themselves VAZ Solex, but this installation basically did not justify itself - even if it was possible to save gasoline, it was only with very careful driving and weak acceleration. So in the Solex 21083 carburetor, jets should be selected that are recommended by the manufacturer. It should also be noted that many repair kits from different manufacturers are now being sold for the VAZ Solex, including parts produced by China. In such kits, the cross-section of the nozzles may not correspond to the declared parameters, therefore, you should try to purchase parts of the original production, or at least from trusted companies that have proven themselves well on the market.

The Solex carburetor provides several types of adjustments, and you can adjust:

the level of gasoline in the float chamber;
the number of minimum idle revolutions;
the qualitative composition of the fuel mixture (TC) using the idle quality screw (XX).

It is very simple to regulate the quality of the vehicle, and any car owner can do the adjustment with his own hands. To do this, you need to warm up the engine well and set the speed with the number screw in the range of 800-900 rpm. Then:

we tighten the quality screw until the internal combustion engine starts to work with some interruptions and reduce the number of revolutions;
we unscrew the screw so that the motor starts running smoothly again, usually one revolution is enough. Loosening the screw too much will increase fuel consumption.

In other cases, it is necessary to loosen the amount screw more, since dips appear in the engine's operation.

One of the most common problems with idling is the inability to adjust the Solex 21083 carburetor using a quality screw - when it is tightened and unscrewed, the engine speed does not change. There are several reasons for this malfunction:

the jet in the solenoid valve is clogged;
clogged channel XX, which is located under the "quality" screw;
the solenoid valve (EC) itself is faulty.

It is quite simple to check the performance of the EC itself, we do it as follows:

on the idle engine, remove the wire from the valve;
unscrew the EC;
we remove the fuel jet from it, it is pulled away by our hands;
turn on the ignition;
we connect the wire to the EK - at the moment of contact, a dry clear click should be heard, and the valve stem is recessed. If there is no click, and the stem does not move, such an EC must be replaced.

It is also necessary to immediately blow through the jet - in some cases, such a small speck gets into it that it is practically invisible. There is also the problem of Solex - the idle channel under the quality screw becomes clogged so that it cannot be blown out.

You can check the efficiency of the EC in another way - while the engine is idling, you need to pull the wire from the solenoid valve - if the motor stalls, then the solenoid valve is working properly.

If the XX channels are clogged, the motor at minimum speed starts to work intermittently, stalls when the gas is released. When there is no time to do repairs, and you need to get to the destination urgently, there is one way you can make the motor work stably at idle. To do this, during the operation of the internal combustion engine at XX, we loosen the key by 13 EC, we find the position in which the engine works most stably. But you should not drive like this all the time - with this position of the solenoid valve, fuel consumption increases sharply, since the idle system works bypassing the XX fuel jet.

In order for the carburetor to work smoothly, it must be adjusted, first of all, the level in the float chamber should be set.To perform this adjustment, it is not necessary to remove the entire carburetor; it is sufficient to remove only the top cover of the assembly.

On a VAZ-2109 car, adjust the fuel level as follows:

stop the engine, dismantle the air filter housing;
disconnect the solenoid valve wire, release the suction cable;
unscrew the clamps and pull off the fuel hoses (main and return) from the carburetor cover;
unscrew the five screws that secure the cover;
remove the lid and turn it over, hold it horizontally, see what is the gap between the floats and the horizontal surface of the lid itself - it should be within 1.0-1.5 mm;
we adjust the required gap by bending the plate holding the floats. When adjusting, it is necessary to achieve the same position of the floats above the surface of the cover.

According to the book instructions, the fuel level in the Solex 21083 carburetor is measured using a caliper - the distance between the upper surface of the main body and the level of the fuel in the chamber is determined, it should be 24-26 mm. Measurement should be made immediately after removing the carburetor cover, as gasoline evaporates quickly.

All of the above adjustments relate to the settings of the Solex 21083 carburetor, and how well the unit is adjusted depends on the nature of the engine operation and fuel consumption. There are some other settings that you should also pay attention to.

The solenoid valve contains an idle jet, and its cross-sectional diameter can be different - from 39 to 42 mm; it also eats accelerator pump sprayers with different “noses” cross-sections (35x40, 40x40, 45x40, 35x35). By selecting the required diameter of both elements, it is possible to achieve the operation of the carburetor without failures, good throttle response. It is difficult to recommend something definite here, an individual approach is needed in each specific case, and the best result is achieved by trial and error. By the way, the "spouts" of the atomizers can be directed:

both to the primary chamber;
one sprayer into the first chamber, the other into the second.

Often, when installing the carburetor, many motorists make one mistake - the suction cable is inaccurately installed, and therefore it is problematic to start on a cold 21083 engine, especially in frosty weather. After fastening the suction cable, before installing the air filter, it is necessary to check whether the air damper is fully closed with the help of the cable. If the flap remains ajar when the suction is extended, it is necessary to fix the cable sheath in a different position.

In order to repair or purge (flush) the carburetor, it must be removed. The unit is removed quite simply; almost any motorist can do it on his own. We remove the device as follows:

turn off the ignition, first of all we remove the air filter housing;
dismantle the return spring from the throttle valve drive;
disconnect the throttle cable;
we unscrew the fasteners of the suction cable;
we unscrew the four nuts on which the carburetor body itself is attached;
dismantle the node.

Installation is carried out in reverse order.

There are malfunctions that are most typical for Solex carburetors:

clogging of the GDS fuel jet;
the ingress of debris into the idle system, especially the XX jet in the solenoid valve is often clogged;
deformation of the bottom surface of the main body due to overheating;
failure of the diaphragm of the accelerating pump;
defect of the solenoid valve;
loosening of the fit of diffusers in the housing.

If the body is deformed, air is sucked in between the carburetor and the intake manifold, and the engine starts to work intermittently, as the air-fuel mixture becomes lean. Idling is difficult to adjust, and to correct the defect, it is required to grind the surface on an emery wheel.If the surface warpage is significant, grinding will no longer help; replacement of the housing is required.

The diaphragm of the accelerating pump can crack over time, lose elasticity, and tears appear in it.

It is quite easy to check the condition of the diaphragm, for this you do not need to remove the carburetor. To get to the diaphragm, you need to unscrew the 4 screws of the accelerator pump cover and remove the part. The condition of the diaphragm is checked by external inspection.

There are many varieties of Solex carburetors on the market. The carburetor is one of the most important parts in the fuel supply process to ensure the quality of the vehicle.

Solex carburetor 21083 is a very popular model that can be found on a large number of domestic cars.

The Solex 21083 carburetor is the basic version, equipped with diffusers of the minimum cross-section, thanks to which this series has gained immense popularity, since it allows for various kinds of modifications, for example, a groove.

You should start tuning the Solex 21083 carburetor by adjusting the fuel level in the float chamber. This involves starting the engine directly and warming it up for five minutes. Then the motor turns off and further actions are performed:

The fuel supply hose is carefully detached to prevent gasoline from entering the chamber during further work.
The screws securing the cover are removed, in the amount of five pieces.
The suction cable is removed.
With extreme care, the lid is lifted horizontally so that the floats are not damaged.
In the chamber itself, the fuel level is measured with a ruler or vernier caliper.

The distance from the top level of gasoline to the edge of the mating plane of the cover should be from twenty three to twenty five millimeters. It is necessary to select an average value, since the fuel level is not able to be in a constant state due to the manifold, which by itself cannot be in a horizontal position all the time. If there was a deviation from the norm of the parameters set earlier, then it is enough to make the folds of the float holders in order to correct the situation.

Then some of the gasoline is removed and the reverse assembly process of the carburetor begins. The keyword here is the opposite, which implies performing the same process, but starting from the end.

At the stage of control check of the engine, it is necessary, of course, to start it, and then for about thirty seconds observe the flow of fuel into the chambers from the side of small diffusers, using a small flashlight for a better view. If gasoline arrives, then an overflow has occurred and the next adjustment of the fuel level is required. To carry it out, it is necessary to turn off the engine and re-measure the fuel in the chambers.

If the parameters are in the area of permissible norms, then the Solex carburetor adjustment ends there. Then the transition to the next stage is carried out.

After completing the adjustment of the fuel level in the float chambers, the engine is warmed up again, coming into working condition. Further work takes place in this way:

A mixture quality screw is found, located in a recess in the lower part of the carburetor, and then screwed counterclockwise all the way to the stop.

During the twisting of the specified part, it is very important to control its own strength, since excessive persistence can lead to threaded failure.

Five or six turns clockwise are made to loosen the screw.

The engine starts again and the choke is removed.

The number screw allows you to set the minimum frequency for the motor to run without interference.

If the device is working properly, then the revolutions are made in an amount from five hundred pieces per minute to one thousand two hundred.

The quality screw is tightened at a fairly slow pace until unstable motor work begins.

Then, in one or one and a half revolutions, it turns back again for stable frequency activity.

The idle speed is regulated by the screw quantity in the range from eight hundred and fifty to nine hundred pieces per minute, if it is not possible to establish the process, then the quality screw comes to the rescue.

Attention!

The result of the idle speed setting is a competent ratio, where the motor is extremely stable and with a minimum vacuum. Image - DIY carburetor 21083 repair

With the right combination of circumstances, the engine should reduce the number of revolutions, and at the end it should completely stall. But if the number screw does not cause any recoil from the engine, then this directly indicates a problem. And it lies in the excessive flow of fuel into the idle channel, which does not allow the quality screw to block it.

Factors causing the problem:

The installed idle jet is larger than necessary.
The plug is not screwed on well enough or the solenoid valve is loose, which causes gasoline to suck past the fuel metering hole.
The jet itself or the place for it is deformed.

To find the problem, you need to disconnect the wire from the valve while the engine is running and look at the result. If the engine stalls, then the real problem lies in the wrong size of the jet. With the engine running, the defect lies in the fuel bypassing the idle system.

To overcome these difficulties, we get rid of the valve with a plug and look at the condition of the orifice, as well as the place where it should sit, to find various local distortions.

The carburetor cover must be replaced if it was possible to find places of deformation in the area of the seat. If no damage can be found, the nozzle is placed on the valve, and the O-ring is covered with oil.

After that, the jet is screwed in with a wrench without using force.

The selection of the appropriate nozzle for adjusting the Solex 21083 carburetor is influenced by the volume of the engine itself. For the primary chamber, fuel samples should be purchased, only then the necessary air analogue is selected for the found model. And in the end it is recommended to start looking for a device for the secondary camera.The jets that come with the original carburetor are considered exemplary models for future purchases. Experienced craftsmen advise you to take them with you in search of new parts.It is necessary to take into account the fact that for depletion of the mixture, a nozzle of a larger diameter is taken by one position, and for enrichment - at the same position less.To control the composition of the fuel mixture in relation to engine speed, emulsion hoses are used. There are three types of them:It should be noted that such a mechanism is not installed on engines with volumes of 1.5 liters or more. This causes malfunctions at excessive speeds.The accelerating pump serves for a stable and timely supply of the fuel jet through the exposed carburetor flap. Deprived flow or dripping is not considered normal. Spilled fuel along the walls of the diffuser is also taken as a deflection.The acceleration pump noses are inserted into different chamber compartments. However, for agility, they can be installed only in the primary, which in exceptional cases will promise excessive overflow. Image - DIY carburetor 21083 repair

Under special conditions, a high vacuum area is formed under the closed carburetor flaps. When they are suddenly opened, the vacuum can instantly decrease, which causes disturbances in the operation of the primary chamber, forming a dip, since at idle the gasoline was sucked out of the channel through the nozzles.

To eliminate the consequences, the idle jet or pump nozzles are adjusted, changing in turn, in order to remove the resulting difficulties with failures and delays with a quick and abrupt pressing of the gas pedal.

It should always be remembered that this kind of manipulation is carried out exclusively with a preheated engine.

The secondary chamber system cannot be regulated due to the native jets produced at the plant, as well as the econostat located in its planes, since it is he who supplies an additional amount of fuel to enrich the mixture when a vacuum is formed in the carburetor caused by high speeds.

The acceleration pump nose is perhaps the only element that can undergo minor changes in cases where the flow of gasoline does not enter its intended place.

So that the carburetor does not seriously junk in the future, it is necessary to carefully monitor its operation and not run to a critical state, which excludes self-repair.It will be appropriate to purchase the necessary parts of a similar carburetor model, disassembled into parts specifically for this purpose.For the best motor performance, it is recommended to get rid of the forced idle economizer. Timely preventive maintenance and precisely selected jets will ensure the most reliable operation of the unit.The article fully reflects the main goal of adjusting the Solex carburetor starting device, based on many years of practice and consisting in a stable engine start at idle, which ensures the standard operation of the starting system.VAZ carburetor models are the classics of the domestic auto industry, from which you cannot get away. With all the disadvantages of such cars, they have one advantage that makes them popular among drivers - low price. Many people buy a VAZ 21083 with a carburetor as their first car.In the late 80s, when the first VAZ 21083 rolled off the assembly line, the carburetor type of the engine was a monopolist - they did not even dream of injectors at the VAZ at that time. From the first days this model received high marks from drivers as one of the best in the VAZ series. However, then little thought about the price of gasoline, which can not be said now.The VAZ 21083 car has 2 doors, a very good streamlined shape, which is important when driving, and also keeps well on the road. The main characteristics of this model is the 1.3 liter four-cylinder engine. Some models were produced with a volume of 1.1 liters, but they did not work very well. The production of such cars was more of a test nature, and only a few cars were produced. Image - DIY carburetor 21083 repair

VAZ 21083 has about 70 l / s in its engine, is capable of picking up speed up to 160 km / h. Due to its Solex carburetor, this car model is quite economical. Average fuel consumption reaches 5.5-6 liters per 100 km. The car's carburetor is very well thought out and not picky about fuel quality.

For the first time Solex carburetors were used in France, where they got their name. At the factories of the domestic market, this type of device was remade and some changes and improvements were made. The Solex-type carburetor began to be installed on cars almost immediately with the first releases of this VAZ model.

The most noticeable change in the design of the engine was the installation of the carburetor not along, as in previous VAZ models, but across. It was necessary to change the design of the engine under the hood due to the fact that it was necessary to improve and make more stable the operation of the engine in the car at a high rise and sharp descent. Later, this type of carburetor began to be used and installed on all VAZ cars.

The Solex carburetor in the car serves to supply the fuel mixture to the engine, where it will ignite further. It mixes the required amount of fuel with air, the ratio of which changes depending on the speed of movement. The VAZ 21083 carburetor consists of two chambers. It is in them that the fuel is supplied and mixed for further work. The whole main process takes place in the second chamber.The main mechanism in the operation of the device is the econostat, it is located in the second chamber of the carburetor. Due to its work when driving at high speed, the fuel mixture is enriched with oxygen. Fuel in the carburetor rises through the tubes. The carburetor jets are responsible for the correct and uniform fuel supply. Therefore, it is very important that they are configured correctly. Image - DIY carburetor 21083 repair

Air supply to the carburetor occurs through special channels in the chamber and is controlled by the throttle valve. In the first chamber, the throttle valve is adjusted using the accelerator. In the second chamber, it opens and closes automatically.

In the cold season, the VAZ 21083 engine is much more difficult to start than in the warm season, and therefore a more saturated combustible mixture is required. The starting device in the car is responsible for the preparation of such a mixture. The starting device performs the process of pulling back the throttle valve spring, then the air damper opens under the air flow, as a result of which the fuel mixture is uniformly mixed.

The economizer is responsible for the idling of the car in the Solex carburetor. It consists of elements such as a switch, a control unit and a solenoid valve. With long and forced idling of the engine, the number of revolutions can reach up to 2000 rpm. In normal operation, this value should not exceed 900-1000 rpm. During this, the economizer is activated, which, using the control unit and its valve, cuts off the fuel supply to the idling system. It also turns off the fuel supply when the engine is suddenly braked and during its operation when driving on a slope. This type of device also serves to prevent large emissions of carbon dioxide into the atmosphere.

Quite often, car owners are faced with a problem in the operation of the Solex carburetor. This happens while the car is moving, as well as when the engine is idling. It is quite simple to identify problems in the operation of the carburetor.

When you try to start the car, it can stall, the tachometer revolutions on the instrument panel float.

When idling, exhaust may appear from the vehicle pipe.

While driving and shifting gears, there may be gaps in the gas pedal.

The main symptom of a breakdown of this device is a noticeable increase in fuel consumption and a decrease in traction in the car. Problems in the operation of the car's carburetor can occur regardless of the season. Therefore, it is worth considering with attention to its work and eliminating malfunctions at an early stage in order to prevent significant damage and complete failure.

Setting up and adjusting the floats and jets in the carburetor chamber is a very delicate job and requires some technical skill and knowledge, especially if this is your first time doing it.

If you need a complete replacement of the device, then the matter is much easier and within the power of any motorist, because at this stage there is no need to disassemble and adjust the device - it is already configured correctly from the factory. You can buy a new carburetor or parts of its repair kit at any car dealership. Nowadays, this type of device is still very widespread, so it will not be difficult for you to find the necessary materials.

The carburetor in a VAZ 21083 car is located under the air filter cover. To remove it, you need several keys. Before that, you need to open 4 latches. Then loosen all the clamps that go to the carburetor. Next, disconnect the contact wire from the solenoid valve and unscrew the carburetor cap. It must be removed so as not to catch the walls of the floats in the chamber, because they can be broken.

The floats in the carburetor chamber must be parallel to each other. If there are any deviations and inaccuracies in the operation of the floats, the fuel will spread unevenly through the chambers.The chambers have red markings on the body that mark the permissible fuel level.

The jets inject fuel into the engine. Normal working jets have three holes. With very long operation and low-quality fuel, they wear out, as a result of which the fuel is supplied in the wrong amount. Adjustment of the jets should be done gradually. When replacing, they must be tightened with an emphasis without the use of significant force.

With regular use of the car, timely cleaning of the Solex carburetor is very important. It is highly recommended to conduct it at least once every six months. This will significantly extend the life of your carburetor and provide a more comfortable ride for your vehicle.

VAZ-2108 - the first front-wheel drive car of the Soviet-Russian automobile industry. The carburetor installed on this car became the ancestor of an extensive family, whose representatives are successfully operated on many passenger car models. Modification 2109, in fact, is no different from the "eight". Over time, any part requires repair.VAZ "eights" and "nines" were equipped with licensed Solex carburetors of the Dimitrovgrad Automobile Unit Plant. The manufacturer installed one of the seven models listed in the table below, depending on the size and other features of the engine. Image - DIY carburetor 21083 repair

VAZ "eights" and "nines" were equipped with licensed Solex carburetors

There are no fundamental differences between the models. All have the same design, but the sizes of the metering elements (nozzles, diffusers) differ, there are some features of some units.

All of the above carburetors are of the float type, that is, those in which a float chamber is used to maintain a stable flow of fuel into the mixer. It consists of a container for fuel floating on the surface of the float liquid and a valve controlled by it, whose task is to limit the flow of excess fuel.

Gasoline is mixed with atmospheric air in two mixing chambers

Gasoline is mixed with air in two mixing chambers. The first is used constantly, the second is connected when maximum output is required from the motor.

The main dosing system operating under load (in motion) ensures stable mixing ratio and includes flow restricting jets and emulsion tubes to slow the fuel flow.

The dosing of the mixture at low speeds is carried out by the idle system. It uses its own nozzles and emulsion tubes that deliver fuel to the space behind the throttle.

In addition to the listed components, there are adjusting elements in the idle system: the quality screw changes the proportion of the mixture, the amount screw opens the throttle valve. The starting system helps the engine start.

A short-term inflow of additional fuel with a sharp gas pedal is provided by an accelerating pump, which consists of a diaphragm, two valves (suction and delivery) and a sprayer.

The enrichment of the mixture in the degree required for the loaded engine is provided by the power mode economizer and the econostat. Saving gasoline is assigned to the forced idle economizer.

They say that the ambitious project "chisel", as the VAZ-2108 will be called for its characteristic chopped shapes, was personally approved by Leonid Brezhnev - the secretary general had a particular weakness for the novelties of the domestic auto industry.

Alexey Kovanov

Repair is the determination of a breakdown, based on its manifestation, and the elimination of damage by replacing defective parts or in another way.

Spare parts and parts that fail most often are sold both separately and as part of repair kits. They usually include:

gaskets,
seals,
springs,
hairpins,
valves and their components,
the axes of the floats,
screws,
diaphragm,
jets,
emulsion tubes. Spare parts and parts are sold as part of repair kits

The carburetor is an important component of the fuel system. Its malfunctions are immediately reflected in the nature of the car's movement.

failure - slowing down or lack of reaction of the car to pressing the gas pedal for several seconds;
jerk - short-term failure;
twitching - a series of jerks;
swinging - several failures in a row;
sluggish acceleration - slow increase in speed;
difficult start of the motor or inability to start;
unstable idle;
high fuel consumption.

There are two reasons for a difficult start: either the proportions of the mixture are changed (too rich or poor), or for some reason the fuel does not reach the carburetor.

Access the carburetor. Press the throttle lever 2-3 times. At the same time, the accelerator pump injects gasoline into the chamber, which can be seen. If there is one, the reason for the difficult start is most likely a violation of mixture formation. The booster pump injects gasoline into the chamber, which can be seen
If there is no gasoline in the mixing chamber, check that it comes out of the tank. Try to pump fuel with the gasoline pump manually by disconnecting the inlet hose from the carburetor fitting.
If gasoline is poured out of the hose in a pulsating jet in time with the pumping, the pump is probably operational. Check the cleanliness of the strainer and the carburetor inlet needle valve.
It is not out of place to make sure that the fuel pump pumps not only manually, but also from the engine drive. To check, lower the free end of the hose into the bottle, crank the crankshaft with the starter. If gasoline does not flow, while the pump manually pumps it normally, then the problem is in the drive. Make sure that the fuel pump is pumping not only manually, but also from the engine drive

In addition to a problematic gas pump, the reason for the lack of fuel can be clogged hoses, a clogged fuel intake and fine filter, and a violation of the ventilation of the gas tank.

To check ventilation, open the gas tank cap, try to pump fuel. If it appears at the outlet of the fuel pump, the clogging of the ventilation holes should be removed.

Hose permeability is checked by blowing with a pump or mouth.

To restore the performance of the mesh filter, wash it in gasoline or acetone, blow with air.

The performance of a stuck needle valve is sometimes restored after lightly tapping on the carburetor body. Even if tapping helps, replace the valve as soon as possible.

The mixing ratio can be disturbed by an incorrect (due to sticking) position of the air damper or damage to the diaphragm of the starter. These problems often manifest themselves with a cold start of the engine.

In addition to them, it is necessary to check the level in the float chamber, the tightness of the gaskets and hoses. Through damage and loose connections, extraneous air can enter the carburetor, changing the optimal mixture ratio.

On the first prototypes of the VAZ-2108, the front fenders, hood, doors and trunk lid were made of aluminum! Hinges, reinforcements, safety bars and other details were also cast from the "winged" alloys. Even the rims were planned to be used unusual - made of polypropylene and polycarbonate, and gas tanks - “blown out” of polyethylene.

Alexey Kovanov

A high level of gasoline in the float chamber - the carburetor "overflows" - usually affects the start of a hot engine.

In addition, the "overflow" manifests itself as unstable idling, black smoke from the exhaust pipe, carbon deposits on candles, dips and the smell of gasoline under the hood.

Among the reasons for the "overflow" are the problems of the throttle valve, solenoid valve, jets and fuel pump. But most often the floats or the needle valve are "to blame".

When the needle sticks in the open position, nothing prevents the flow of gas, while its level in the float chamber should be stable.

A similar picture develops when a depressurized float loses its buoyancy and does not control the valve, or the float mechanism is not regulated.

To check the level in the float chamber, the health of the needle valve and floats, to adjust the float mechanism, remove the carburetor cover.

To check the level in the float chamber, the health of the needle valve and floats, to adjust the float mechanism, remove the carburetor cover

The required level of gasoline is 25–26 mm from the top edge of the chamber. If less or more, adjustment is required.

Check that the needle valve is working by creating a vacuum in the inlet connection with a rubber bulb or with your mouth. If the valve is leaking air, the only way to repair is to replace it.

Place the cover on a flat surface with the floats facing up. Examine her. The correct position of the floats is parallel to the marks on the bottom of the carburetor on the gasket. The lever tongue should be centered on the valve ball. The distance from the bottom edge of the floats to the spacer is 2 mm.

Distance from the bottom edge of the floats to the spacer 2 mm

Bending the rods of the lever, achieve a position when the upper cut of the floats is 34 mm higher than the cover. The free play of the bottom edge is adjusted by bending the tongue. Its norm is 15 mm.

Bending the lever rods, achieve a position when the upper cut of the floats is 34 mm higher than the cover.

In the vertically turned lid, the tongue presses against the ball, closing the valve. The marks from the stamp on the side faces of the floats must be parallel to the cover.

The integrity of the floats is determined by external inspection. For a more accurate assessment, they are removed and placed in a container with gasoline, pressing down with a load.

The first (main) chamber of the VAZ-2108 (2109) carburetor prepares the mixture at idle, low and medium load. The second is connected to help when the load increases.

The problems of the first chamber are manifested in idle violations, dips and jerks. When the camera is completely inoperative, the engine stalls, it is worth releasing the gas pedal.

The performance of the camera depends on the health and adjustment of the throttle valve. But most often the cause of violations is in the contamination of the nozzles, pipes and channels.

Many motorists, desperate to restore their working capacity, spend money on a new carburetor. Waste can be avoided by thoroughly cleaning the carburetor.

For cleaning, the jets and emulsion tubes are unscrewed and removed and marked so as not to be confused during assembly.

First, the float chamber is washed using exclusively a rubber bulb, but in no case with a rag, which can leave invisible villi in the carburetor.

The channels, nozzles and pipes are blown out with a strong air jet, washed with gasoline, acetone, thinner or carburetor cleaner. Gasoline is used most often for cleaning. It does not harm diaphragms and seals, but it flushes out deposits worse than other solvents.

Heavily clogged nozzles are cleaned with a wooden toothpick or copper wire with a diameter of 0.8 mm. Washing and blowing is repeated until completely clean.

The carburetor may freeze during prolonged driving at a constant speed in wet, cold weather. In places with the highest air speed, ice appears, clogging the air channels to such an extent that the engine stalls. Ice can be seen by quickly removing the air filter cover. But on a warm engine, it quickly melts.

To prevent icing, heated air is supplied to the air filter at low temperatures along with cold air. Some drivers unknowingly get rid of "unnecessary" details, creating the prerequisites for the formation of ice.

To prevent icing, warmed air is supplied to the air filter at low temperatures along with cold air.

Freezing up the carburetor is not a big problem. As soon as the engine is turned off, the ice melts in a few minutes.

Usually the carburetor is serviced and adjusted directly at the engine.Removal and disassembly is required when normal troubleshooting methods do not help.

Video (click to play).

To work with the carburetor, you will need the following tools and accessories.