Fuel supply system VAZ 2114

Fuel is supplied to the engine by VAZ 2114 injectors installed in the intake pipe.

Fuel supply system with distributed injection
1 – fitting for monitoring fuel pressure
2 – injector ramp
3 – bracket
4 – fuel pressure regulator
5 – electric fuel pump
6 – fuel filter
7 – fuel drain line
8 – fuel supply line
9 – nozzles

An electric fuel pump installed in the fuel tank supplies fuel through the main fuel filter and the fuel supply line to the VAZ 2115 injector ramp.

The Lada Samara 2 fuel pressure regulator maintains a constant pressure difference between the inlet pipe and the discharge line of the ramp. The fuel pressure supplied to the injectors is within 300±6 kPa when the engine is not running. Excess fuel beyond that required by the injectors is returned to the fuel tank through a separate drain line.

Before servicing fuel equipment, it is necessary to relieve the pressure in the fuel supply system of the VAZ 2114.

When disconnecting the fuel lines, do not allow the VAZ 2113 fuel to spill. To do this, wrap the ends of the tubes with a rag.

A whole complex of devices combined into one fuel system is responsible for supplying fuel to the VAZ 2114 engine. This article is dedicated to it, by studying which you will learn what the power supply system of the VAZ 2114 injector consists of, what is the principle of its operation, and what preventive measures must be taken in order for the system to work out its resource to the fullest.

The fuel supply system is the main artery of the car

PRINCIPLE OF OPERATION OF THE SYSTEM

The fuel system of the VAZ 2114, in comparison with foreign cars, is made quite simply, thanks to which a high level of its reliability and endurance has been achieved. The 2114 has an injector for injecting gasoline into the combustion chambers. The presence of an injector provides for a complex fuel dosing system, for which the ECU controller (electronic control unit) is responsible.

The VAZ 2114 fuel pump is driven electronically. The injection moment itself is calculated thanks to sensors that determine the location of the car’s crankshaft. When the fuel pump is turned on, the fuel is supplied through the transport system to the filters, where it is cleaned of impurities, and after the filters - to the fuel rail.

The fuel rail is the part of the intake manifold in which gasoline and gas are mixed in a ratio of 1 to 15 (an increase or decrease in the amount of gas can be adjusted manually, but the optimal gasoline consumption is observed precisely at the above ratio). Next, the mixture is supplied to the injectors, after which it enters the combustion chambers.

Main components and how they work

The entire scheme of the VAZ 2114 fuel system is built on the injection principle, implying complete electronic control over the system’s operation process - starting with fuel supply and ending with the formation of a working mixture and combustion. Because of this, its constituent components are very different from devices characteristic of the carburetor principle.

So, it includes:

fuel tank;
pump (gasoline pump);
pipelines for supplying gasoline;
fuel filters;
fuel rail;
tank filler cap;
nozzles;
recycling block.

VAZ 2114 fuel system diagram

They perform the following functions.

Tank - provides storage of fuel reserves.

Pump - located inside the gas tank and serves to pump fuel to the ramp. Thanks to the sensor connected to it, it detects and transmits data on the level of remaining gasoline to the electronic unit.

According to reviews from 2114 owners, the best pump for this car is a fuel pump from Bosch, which is characterized by a long service life and great reliability.

Pipeline system - serves to move fuel to the engine and drain the remaining excess into the tank. It includes a system of metal tubes and flexible hoses, among which are the VAZ 2114 fuel hose, return hose, hose for connecting the adsorber and others.

Filters - serve to purify gasoline from possible impurities and sediments. The service life of the injectors, as well as the quality of the resulting fuel mixture, directly depends on their operation. That is why they should be replaced at least every 10,000 km.

WHAT GASOLINE TO POUR IN THE VAZ-2114?

This topic has become overgrown with various conjectures and speculations, but we will try to put everything in its place.

The technical data sheet of the fourteenth indicates that the car engine requires AI-95 gasoline, and there is no reason not to trust the manufacturer’s recommendations.

Another thing is that many car owners, over their long driving experience, have accumulated rational doubts about the existence of any serious differences between 95 and 92 gasoline. Adding fuel to the fire was the recent statement by the chief engineer of the Moscow oil refinery, A. A. Abrosimov, that we do not make 95-grade gasoline in our country, and everything that is sold under its guise is either 92-grade or unknown fuel brought from somewhere.

As evidenced by reviews from VAZ 2114 owners who use exclusively 92-octane gasoline, there were no problems with the car during its service life due to fuel, and they see no point in using a more expensive analogue. However, the final decision about what to pour into the fourteenth is yours.

COMPONENTS OF THE FUEL SYSTEM

The VAZ 2114 fuel system consists of the following main elements:

Gas tank;
Fuel pump;
Gasoline filtration devices;
Pipeline system;
Fuel rail;
Injectors;
Waste disposal unit.

Fuel system diagram

Let's analyze each component separately.

GAS TANK

The VAZ 2114 gas tank is a container made of two equal metal parts. A neck is removed from the tank into which gasoline is poured. The neck is connected to the tank via a rubber pipe and clamps.

FUEL PUMP

The fuel pump is located directly in the tank. It has a fuel level sensor, which transmits information about the current amount of gasoline to the ECU. The gasoline pump is connected to a line through which gasoline is transported to the fuel rail. The fuel pump itself consists of several parts - coarse filters, wiring and an electric motor, which pumps fuel. As evidenced by reviews from owners of fourteenth cars, fuel pumps from the German company BOSCH have proven themselves to be the best.

FILTRATION DEVICE

The VAZ 2114 fuel injection system very much depends on the quality of the filter devices used. A bad filter will significantly reduce both the efficiency and the longevity of the entire system.

On the fourteenth, non-separable filters with a working element made of paper are installed. Such filters clog quite quickly, and they need to be changed at least once every 10-15 thousand kilometers.

FUEL RAIL

The fuel rail is located on the intake manifold housing. Its design consists of two parts, separated by a spring-loaded diaphragm. The first is the fuel one, in which the required level of gasoline pressure is set, the second is the air one, air is pumped into it, due to which the diaphragm compresses the fuel chamber and changes the pressure level in it.

Ramp

PIPING AND HOSES SYSTEM

To circulate gasoline from the gas tank to the injectors, the fourteenth uses steel fuel lines located on the bottom of the car. The VAZ 2114 fuel supply system also provides for a return pipeline through which excess gasoline from the injectors is returned back to the gas tank.

VAZ 2114 owners are advised to carefully monitor the condition of the fuel line in order to avoid gasoline leaks. Pipes should be checked regularly for deformation and corrosion.

Description of the power system design

The vehicle's power system is designed to store fuel reserves, purify fuel and air from foreign impurities, and supply air and fuel to the engine cylinders.

The air entering the engine cylinders is cleaned of dust by an air filter. Air filter

installed in the engine compartment on three rubber supports. The filter element is replaceable and made of special paper. To prevent contaminated air from leaking into the intake tract, there is a sealing edging at the top of the element. To replace the filter element, the filter cover is removable. The purified air passes through the mass air flow sensor through the air duct to the throttle valve.

Throttle valve

regulates the amount of air entering the engine cylinders. The damper drive from the gas pedal is cable. The damper rotates on an axis in the housing (pipe). The throttle body is secured to the receiver flange with studs. The housing has a channel for coolant. The channel is connected to the cooling system by rubber hoses. Circulating coolant through the throttle body prevents the body's internal air cavities from freezing in the winter. The housing contains fittings for connection to the absorber and the engine crankcase ventilation system.

The throttle body, with the throttle position sensor and idle speed control installed on it, form the throttle assembly.

Throttle assembly: 1 - throttle valve drive sector; 2, 4 — fittings for connection to the engine cooling system; 3 — crankcase gas outlet fitting; 5 — throttle position sensor; 6 — idle speed regulator; 7 — fitting for connecting to the adsorber; 8 — throttle valve; 9 — throttle body pipe

Air is supplied to the intake valves of the engine cylinders through the receiver and the intake manifold.

Fuel tank

steel, welded from two stamped parts. The tank is suspended from the bottom of the car on two steel clamps. The filler neck of the fuel tank is located on the right side of the vehicle and is closed with a plug. Fuel from the tank is supplied by an electric submersible fuel pump.

The pump is installed in the fuel tank. To access the pump, there is a hatch with a cover in the bottom of the car under the rear seat cushion. A strainer is installed on the inlet pipe of the fuel pump, which traps small solid particles of debris that enter the fuel tank along with gasoline. The pump is turned on by command from the ECU.

Fuel pump: 1 - protrusion for attaching the strainer; 2 — fuel intake pipe for connecting a strainer; 3 - body; 4 — electrical connector block; 5 - outlet (discharge) pipe for connection to the fuel module cover with a corrugated tube

PREVENTION OF THE FUEL SYSTEM VAZ-2114

Prevention, as a rule, comes down to regular cleaning and, if necessary, replacing the fuel pump filter and the main fuel system filter.

Also once every 25-30 thousand km. It is necessary to clean the injectors, which is performed exclusively at a service station. There are two methods for cleaning injectors, neither of which require removing them:

Ultrasonic cleaning;
Cleaning with a special washing liquid.

The most effective and expensive is ultrasonic cleaning, which makes it possible to bring back to life even heavily worn nozzles.

For all types of vehicles, the timing of replacing the lubricating fluid of their power unit is established by the manufacturer's regulations. It is worth noting that the figures indicated in it are very approximate (approximately 12-15 thousand kilometers), however, it is impossible to correctly calculate the order of oil changes, since this is influenced by many factors. Unfortunately, the automaker does not always take most of them into account. Continue reading →

How to convert a VAZ 2107 carburetor engine to an injection engine

Some owners of carburetor “classics” independently convert their cars to an injector. Naturally, such work requires a certain amount of experience in auto mechanics, and knowledge in the field of electrical engineering cannot be done here.

What will you need to buy

The kit for converting a carburetor fuel system to an injection system includes:

electronic control unit;
gas tank;
cylinder head (new or used from VAZ 21214);
receiver;
ramp with nozzles;
fuel pump assembly;
fuel filter;
fuel line with rubber hoses;
throttle assembly;
accelerator pedal with cable;
air filter assembly with sleeves;
front engine cover;
crankshaft pulley;
ignition module;
sensors for mass air flow, damper position, detonation, coolant temperature, oxygen concentration, crankshaft position, detonation;
high voltage wires;
harnesses, cables, wires, terminals, thermal casings;
brackets.

The cost of all these elements is about 30 thousand rubles. The electronic control unit alone costs approximately 5–7 thousand. But costs can be significantly reduced if you buy used parts rather than new ones.

Conversion stages

The entire engine tuning process can be divided into the following stages:

Removing all attachments: carburetor, air filter, intake and exhaust manifolds, distributor and ignition coil.
Removing wiring and fuel lines. To avoid confusion when laying new wires, it is better to remove the old ones. The same should be done with the fuel pipes.
Replacing the fuel tank.
Replacing the cylinder head. You can, of course, leave the old “head”, but in this case you will have to bore the inlet windows, as well as drill holes and tap them for the receiver mounting studs.
Replacing the front engine cover and crankshaft pulley. In place of the old cover, a new one is installed with a shimmer for the crankshaft position sensor. At this stage, the pulley also changes.
Installation of the electronic control unit, ignition module.
Laying a new fuel line with the installation of a return line, a fuel pump and a filter. The accelerator pedal and its cable are also replaced here.
Installation of ramp, receiver, air filter.
Installation of sensors.
Laying wiring, connecting sensors and checking the functionality of the system.

It’s up to you to decide whether it’s worth spending time and money on conversion, but it’s probably much easier to buy a new injection engine, which costs about 60 thousand rubles. All that remains is to install it on your car, replace the gas tank and lay the fuel line.

Despite the fact that the design of an engine with an injection power system is much more complicated than a carburetor, it is very repairable. If you have at least a little experience and the necessary tools, you can easily restore its functionality without the involvement of specialists.

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With the start of production of VAZ 2113, 2114 and 2115 cars, they used a carburetor-type engine with a volume of 1600 cubic centimeters. After long-term operation of this sample, several problems characteristic of the carburetor power system were identified. Namely: contamination of the jets, incorrect adjustment of the quality and quantity of fuel, unstable idle speed, etc. Therefore, it was decided to replace the type of power system with a more reliable one.

After the engineers chose which options to weed out and which to leave, the VAZ 2114 and 2115 with an injector engine were released. With the modification carried out, the engine design changed radically: power and speed increased, acceleration time to 100 km/h decreased. The engine size and number of valves remain the same. Let's look at what exactly the updated device contained, point by point.

Electrical equipment

On a VAZ 2114 car, such a concept as: a unified circuit of electrical appliances is simply absent. This is explained by the fact that from 1999 to 2011, the injector was modernized, incorporating more and more new components into its device that affect the final power and speed of the machine. In order to study how the electrical wiring diagram and its components work, you need to understand this individually, together with a specialist. The basis of any such system is a computer. The rest of the device may differ radically from each other, depending on the year of manufacture of the VAZ car.

Idle speed adjustment

On carburetor engines, cold starting was quite difficult - it was necessary to pull the “choke” cable so that more gasoline and less air entered the combustion chambers. And it was necessary to open the air supply in a timely manner, otherwise the car would “eat” gasoline very greedily. As for adjusting the idle speed on injection engines, a specially designed engine (IAC) is used for this.

When the valve is closed, air enters the fuel rail through a thin channel, bypassing it. This channel is closed by a conical needle, which is mounted on the regulator. The microcontroller control system, depending on the engine operating mode, sends a signal to the electric motor. At the same time, the needle moves, changing the air supply to the ramp. At the same time, a certain engine speed is maintained - specifically, 750 rpm.

Device

An injector engine consists of several main elements. As in any car, fuel comes from the tank through the fuel line. Along the way, the combustible mixture goes through several stages of purification: a fine filter and a coarse filter. There is no strainer, such as was located on the carburetor inlet.

In general, on a VAZ car with an injector engine, instead of carburetor throttle valves, a throttle assembly is used. Its circuit is directly connected to the adsorber of the electromagnetic valves. It is he who regulates the fuel supply to the injectors.

As far as everyone knows, the correct operation of the engine directly depended on the amount of combustible mixture. It was controlled by the volume of the primary and secondary carburetor chambers, and the jets. In the version with an injector, a combination of three valves is used: two-way, safety and gravity. It is they who control that there is no overflow of the spark plug, or, conversely, a lack of fuel in the combustion chamber.

Fuel pressure control

In order for the engine to produce normal power and have synchronous operation of the valves, a fuel pressure regulator is installed in front of the injectors. With increased or decreased pressure, the regulator is activated, ensuring further operation of the piston.

Well, the last element of the device is the nozzles. They regulate injection into the combustion chamber. Since fuel is supplied to the injectors under constant pressure, they almost never clog. That is why the service life of a VAZ 2114 engine with an injector, without outside intervention, is much longer than with a carburetor.

In the period from 1999 to 2011, VAZ 2114 models with an injector engine were produced in two versions, which differed in engine capacity: 1500 and 1600 cm/cc. Their design was slightly different, not the circuit itself, but some components not related to the fuel system.

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The fuel filter plays a rather important role in the car's power system. Regardless of which engine (diesel, carburetor or injection), or which car (domestic or foreign car), such a mechanism is installed on all fuel systems. Let's look at the principle of operation and design of the fuel filter, using the example of a VAZ 2114 car.

conclusions

The design of the 8-valve injection engine VAZ-2114 is quite similar to the first generations of this engine - “Samara”. Of course, the designers made many changes to the features of the power unit, but in many ways they remained similar. Repair and maintenance of this engine must be carried out regularly, which will not only extend its life, but also reduce wear on the parts located inside.

The fuel supply system is the main artery of the car

Purpose

The starting point where gasoline comes from is the gas tank. It is a 40-liter canister, which is absolutely sealed. If the car is used for a long time (about 5 - 10 years), then rust forms on the walls of the tank. Small parts of it are washed with gasoline and settle at the bottom. When driving over uneven surfaces, pieces of rust rise and enter the fuel system.

Considering that the cross-section of the jets is very small, in order to completely close them, a few particles of rust will be enough. So, to prevent this from happening, the car uses a fuel filter that retains all the debris from the tank.

Also, when the car is idle for a long time, gasoline vapors in the gas tank rise upward, and the watery part remains at the bottom. In this case, if you start the engine, gasoline will be supplied to the system along with water. Then, the VAZ 2114 fuel filter retains water and only allows gasoline fumes to pass through.

Of course, not one cleaning element does not last very long. This part constantly gets clogged and needs replacement very often. Fortunately, this part is not expensive, and any car owner can afford to buy it.

Gasoline pump and purification

Using a two-stage electric drive, the fuel pump pumps gasoline into the line. The pump is of a rotary type, it is not dismountable, and is installed directly in the gas tank. This reduces the possibility of a vapor lock occurring, since gasoline is injected under high pressure and not under vacuum. The pressure value is about 284 kPa on VAZ-2111 and VAZ-2112 engines, and also over 364 kPa on VAZ-21114 and VAZ-21124 engine models.

The gasoline filter is built into the supply line directly between the ramp and the electric pump. It is located under the body, directly next to the fuel tank. The filter is a non-separable element; the housing is made of steel. Inside there is a paper type filter element. For rough cleaning of fuel, a so-called diaper is used, which is installed in the lower part of the pump.

Device

Unlike the VAZ Classic, on the Lada 2114 model, fuel filters are installed on the highway, and not in the engine compartment. There are only two of them: fine cleaning and coarse cleaning. They differ in their structure, as well as in the quality of cleaning.

First, on the way from the gas tank to the carburetor, a coarse filter is installed. It is located on the pipe that comes out of the tank and leads into the engine. The cleaning element of such a filter is a mesh. Its purpose is to clean gasoline from large debris present in the tank. Since this mechanism is very simple in design, it does not need to be replaced, and it is enough to simply wash it with gasoline and put it back.

Further along the fuel line there is a fine filter. Its structure is already heavier. It consists of a plastic body with two pipes. The fuel enters one pipe and, after passing through the filter element, comes out of the second.

This type of filter is considered disposable. That is, it cannot be cleaned or repaired. If it gets clogged, the only solution is to replace the part with a new one. And changing this device is easy. First, loosen the clamp on the exhaust pipe. Then, remove the main hose from it and insert a new filter into it. This is done to prevent gasoline from leaking out.

The old fuel filter must be held in such a position that the outlet pipe faces upward. Next, loosen the second clamp and remove the old filter element. The fuel line hose coming from the gas tank should still face up. Once the old unit is removed, insert the hose into the inlet of the new cleaning element. That's it, the replacement is complete.

Air intake and throttle valve

The first thing we will consider from the design of the VAZ-2110 fuel system (injector, 8 valves) is the air supply. An air purification filter is installed at the inlet - on the “tens” it is made of paper, flat, and has a large surface area. Due to this, filtration occurs as efficiently as possible. The design of the throttle assembly looks like this:

The pipe through which liquid from the cooling system is supplied to the housing.
The pipe through which the crankcase is ventilated during idle operation.
A pipe through which liquid is drained.
A sensor that allows you to determine the position of the damper when the engine is running.
Idle air control (you can’t call it a sensor, since the device doesn’t measure anything). This is a simple stepper electric motor that allows you to change the amount of air supplied to the ramp when idling.
Fitting – necessary for purging the adsorber.

Symptoms of malfunction

Sooner or later, any fuel filter becomes clogged and needs to be replaced. But what are the characteristic symptoms that indicate that the filter element has worn out?

The first symptoms by which it can be determined that the mechanism requires replacement is a loss of engine power. When you press the gas pedal, the car will choke and jerk. It is worth knowing one detail that will distinguish this malfunction from others - at idle speed, the engine will operate stably.

If, when you press the gas pedal, the car not only jerks, but also stalls, then this means that it is time to change the filter, since such driving can have a detrimental effect on other components and mechanisms of the VAZ 2114 car.

The next degree of filter contamination is when the car begins to stall even at low speeds. At the same time, it is impossible to move uphill because there is not enough power. The last stage, which clearly indicates that the filter needs replacement, is when the car stalls immediately after starting, or does not start at all. But experts strongly recommend not to let the cleaning mechanism reach this state. If your car has the first symptoms, then replace the filters immediately, especially since they will not take a lot of money and time to install.

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On VAZ 2108 cars, an emulsion, two-chamber Solex carburetor was installed, with a falling air flow. It was considered a factory option, and was most often found on this Lada model. Of course, over time it was changed to “Ozone” or “Daaz”. They did not have a particularly different device, but in some ways they differed from the standard one. We will look at this in this article.

Device

The carburetor of the VAZ 2108 car consists of two main parts - upper and lower. In each of them, there are some parts and mechanisms that are directly connected to each other. Let's look at the design of the standard Solex carburetor in more detail:

Float chamber. It houses the jets, float and throttle valve;
The first and second chambers, with a dosing device;
Vehicle idle system;
Transition system located in the second chamber;
Econostat;
Pneumatic economizer;
Accelerator pump;
Gasoline starting mechanism;
EPHH;
System providing crankcase ventilation;
The mechanism that controls the dampers.

Principle of operation

On the Lada 2108, different engines were installed, from 1100 cubic meters to 1500. At the same time, the carburetor design did not change at all. Enlarged jet holes helped adjust the fuel supply for a more powerful engine.

The operating principle is quite complex. Gasoline passes through a filter at the carburetor inlet. There is also a valve that prevents the amount of gasoline in the chamber from decreasing.

From the chambers, gasoline flows through jets into wells, where it mixes with oxygen and forms a flammable mixture. Some of the gasoline is taken by the idle jet, also mixing it with air. The rest of the mixture is injected under the valve. At the place where this injection occurs, two screws are installed - the quality of the fuel and its quantity. Thanks to them, you can adjust the number of engine revolutions and the supply of gasoline. The VAZ 2108 carburetor is adjusted using a flat-head screwdriver.

The economizer serves to add fuel to the combustion chamber when the throttle valves are fully opened.

The econostat is also responsible for the additional supply of gasoline, but, unlike the economizer, it passes it through the nozzle. The econostat starts working when the engine reaches maximum power.

The accelerator pump in Solex carburetors serves for atomized injection of fuel into the float chamber. It is activated when you sharply press the gas pedal, that is, during acceleration. Its device also provides for stopping the fuel when the gas pedal is released. This will protect the mixture in the float chamber from excessive air leaks.

Acceleration pump nozzle

A starting device is installed in order to increase the amount of gasoline supplied to the float chamber. Mainly used to start the engine “cold”. Increasing or decreasing the fuel supply is carried out manually, using a choke.

After the mixture is ready, it is fed into the combustion chamber through the intake manifold opening. Since the Solex carburetor was installed on all modifications of the VAZ 2108 engine, the difference between them can only be in the size of the manifold hole. Therefore, be sure to pay attention to the diameter of the hole and the size of the gasket. This will be useful to you if you carry out repairs.

Absorber and its system

Some Lada cars have a fuel system with an absorber. An absorber is an indispensable thing nowadays. It serves to reduce emissions of fuel vapors into the environment.

Absorber

The absorber is a flask filled with special carbon that evaporates fuel vapors and supplies them to the car's receiver. Installed in the vehicle's engine panel.

Absorber sensor

The absorber sensor controls the opening and closing of the air supply to the absorber to control vapors. Installed on the engine cover in engine versions with a volume of 1.6 liters, in engine versions with a volume of 1.5 liters it is installed directly on the absorber flask.

Separator

The separator in Lada cars is installed under the rear left wing near the shock absorber strut and serves to expand the fuel vapor formed in the tank due to temperature changes. Externally, the separator looks like a coolant expansion tank.

Tilting valve

This valve is installed next to the separator under the rear left fender of the car. The valve serves to prevent fuel from entering an overturned car during an accident. That is, when the valve is turned over, it shuts off the fuel system, protecting the car involved in an accident from fire.

Problems and repairs

Very often, Solex carburetors encounter a problem such as clogging of the inlet hole in the first chamber. This is due to the fact that after long-term operation of the engine, carbon particles appear on the cylinder walls, which enter the chamber along with the air entering the carburetor. Repairing this problem is quite simple. In order to clean the holes and chambers from carbon deposits, use a special liquid that is sold in every Automotive store. It eats away carbon particles and cleans the carburetor. If such a breakdown caught you on the road, and you did not have a cylinder with such a liquid at hand, then the following scheme of actions will help you:

Without turning on the ignition, pull the choke lever towards you until it stops;
Start the engine;
Gradually and smoothly release the choke, and when you feel that the car is about to stall, press the gas pedal all the way. You need to provoke the opening of the second chamber, and then the carbon particles will fly out of the hole under high pressure.

Remember that this method will relieve you of the problem for a while. To completely solve it, contact a service station, where the carburetor will be repaired. Another weak point of Solex carburetors is the small hole in the idle jet. This is fraught with the fact that even a small speck can clog the hole, and the car will stall at idle. In such a situation, no repair is required. Simply remove the jet and blow it out thoroughly.

The third problem, which very often occurs on carburetors of VAZ 2108 cars, is wear of the economizer gasket. At the same time, the engine's idle speed will not be stable, and the exhaust gases will turn black. Repair is carried out by replacing the gasket.

There are rarely cases when the amount of carbon deposits entering the chamber is very large. This mainly happens to those cars that have not undergone major repairs in a timely manner. Since the previously described scheme will not help you get to the nearest service station, you need to act more radically. Experts, in this case, recommend disconnecting the breather from the carburetor, directing its flow downward, using a long hose. This will help you somehow get to the station where repairs can be carried out.

Remember to periodically clean the Breather

Don't forget that the carburetor must be adjusted correctly. The VAZ 2108 carburetor is adjusted as follows: tighten the quality screw and the quantity screw until it stops, turning them clockwise with a screwdriver. Next, unscrew the quantity screw by one and a half turns, and the quality screw by 3.5. This is a mixture adjustment with minimal spark plug wear. If the spark plugs are worn out enough, add 1 - 1.5 turns for quality. With normal settings, the Solex should provide the engine with 800 - 900 rpm at idle. Under such conditions, repairs will very rarely be necessary.