Everything that the owner of the VAZ 2107 should know about his carburetor

The VAZ 2107 model (popularly called simply the “seven”) has been considered a classic of the domestic automotive industry for decades. Over the years, the car was repeatedly modified and re-equipped, but the classic version until 2012 was equipped with a carburetor engine. Therefore, it is so important for the owners of the "seven" to understand the design of the carburetor and be able, if necessary, to adjust, repair or replace it.

Carburetor VAZ 2107

Why was the VAZ 2107 equipped with carburetor engines? There are many reasons for this: from the typical requirements of that time to the ease of operation of this kind of installation. Throughout the entire period of production of the model, two-chamber carburetor mechanisms were installed on the car. That is, two chambers are built into the body of the device, in which the fuel-air mixture is ignited.

Mechanism device

If we talk about the design of carburetors on the VAZ 2107, then they all have an indivisible cast body, the internal content of which can be conditionally divided into three main parts:

• top (represents a carburetor cover and fuel fittings, that is, there are special connectors to which fuel hoses are connected);
• medium (directly the body itself, in the cavity of which two internal combustion chambers, diffusers operate);
• lower (consists of such important elements as a float chamber and a throttle valve).

The carburetor consists of more than 40 small parts and mechanisms

In the arrangement of carburetors on the VAZ 2107, small details are of great importance. Each component of the system is aimed at doing its job, and therefore the failure of at least one part threatens to break the entire carburetor.

In the design of the device, the following can be considered especially “capricious”:

1. Jets. These are tubes with clearly calibrated holes. There are fuel and air (for supplying gasoline and air, respectively). If the holes become clogged with dust or, conversely, wear out during operation, the throughput of the jets can be reduced or increased. In this regard, the carburetor will not be able to maintain proportions when forming the fuel-air mixture.
2. Float in the float chamber. It is this device that determines the required level of gasoline to guarantee the quality of the engine in any of the modes. If the float settings go astray, then the whole system experiences difficulties in preparing the mixture, since there may not be enough gasoline or, conversely, too much.
3. Carburetor gaskets. As an element, gaskets are installed on the outside of the carburetor body to prevent overheating of the device and securely fix the device itself to the intake manifold. However, frequent driving on broken roads quickly wears out the gaskets, so it is recommended that you pay attention to these elements every time you inspect the device.
4. Accelerator pump. This is a special device whose function is to transfer the mixture from the chamber to the engine.

For your information:

Typical equipment of the VAZ 2107 in the USSR and Russia meant 1.6 liter carburetors. The maximum power of such an installation is 75 horsepower. The device consumes AI-92 fuel.

Dimensions of carburetors VAZ 2107 minimum:

• length - 16 cm;
• width - 18.5 cm;
• height - 21.5 cm.

The total weight of the assembly is about three kilograms.

The device has a molded body and built-in elements

Purpose of the carburetor

The essence of the work of any carburetor is to create a fuel-air mixture. To do this, the following processes take place in the device case:

1. The throttle valve opens, through which a strictly limited amount of gasoline enters the cavity of the float chamber.
2. The economizer also regulates the fuel dose, so only the amount of gasoline that the engine needs at the moment of operation enters the chamber.
3. Through jets (special tubes with holes), gasoline is directed to chambers No. 1.
4. Here, the fuel is crushed into tiny particles and mixed with air particles: in this way, a fuel-air mixture is created, which is necessary for the full operation of the engine.
5. If the vehicle speed increases, a second chamber may be used to create more mixture.
6. The accelerator pump sends the finished mixture to the diffusers, and from there to the cylinders.

The carburetor is the "main assistant" of the engine

Thus, the carburetor not only creates a fuel-air mixture, but also forms it according to clear proportions in the quantities necessary for the smooth operation of the engine.

What carburetors are installed on the VAZ 2107

Since the release of the "seventh" model, AvtoVAZ engineers have repeatedly changed carburetor installations on cars so that the VAZ 2107 can meet the requirements of its time. Particular attention was paid not only to power characteristics, but also to indicators of fuel consumption, environmental friendliness and ease of maintenance.

In the history of the VAZ 2107, three main carburetors can be distinguished:

1. "DAAZ" (the device is named after the manufacturer - Dimitrovgrad Automotive Plant). The first carburetors for the VAZ 2107 were manufactured in Dimitrovgrad under a license from Weber. The design of these devices was extremely simple, and therefore reduced the cost of the model. DAAZ carburetors were distinguished by good speed indicators, however, they consumed a large amount of gasoline - at least 10 liters per 100 kilometers.
2. Ozone is an improved version of DAAZ. This installation met all the environmental requirements of its time, besides, the designers managed to reduce gasoline consumption. For speed of work, a pneumatic valve was built into the equipment of the second internal combustion chamber, which became a problem for many car owners. As soon as the valve got a little dusty, the second chamber of the carburetor ceased to function.
3. The most modern installation of the Dimitrovgrad plant is called "Solex". Structurally, this carburetor is very complex, as it has a fuel return system. Thanks to this, Solex saves gasoline, even at high engine speeds. However, this modification also has its drawbacks: the carburetor is very capricious to the quality of the fuel consumed.

Photo gallery: a selection of iconic carburetors throughout the history of the "seven"

Prototype of all domestic carburetor installations

The first modified version of carburetors, which allowed to reduce fuel consumption

Modern carburetor

Installation of two carburetors

Experienced drivers of the "sevens" have heard that two carburetors can be installed on a car at once. Such an operation makes sense to give the engine additional power and reduce fuel consumption.

The installation procedure is not complicated, but you need to understand the nuances of the design of your car. As practice has shown, the installation of two carburetors on the VAZ 2107 really allows you to give the car acceleration and make the ride more comfortable. Contrary to popular belief, paired carburetors help reduce fuel consumption.

Two carburetor mechanisms allow to facilitate the work of the motor and optimize all its characteristics

Signs of a malfunction of the VAZ 2107 carburetor

Like any other mechanical device, a carburetor can fail. Very rarely, breakdowns happen suddenly, usually the mechanism for some time lets the driver know that something is wrong with him.

Thus, there are pronounced signs of malfunctions that the owner of the VAZ 2107 should pay attention to.

Engine stalls at idle

Idle instability, jerking and jerking of the engine, or simply the inability of the engine to idle, all indicate a malfunction in the carburetor. As a rule, "guilt" for these malfunctions can be assigned to:

• idle economizer, which is responsible for the operation of the engine in warm-up or idle mode;
• a float that has shifted to the side, due to which there is not enough fuel in the chambers to create a fuel-air mixture;
• an accelerator pump that does not supply the required amount of fuel, so the engine is very difficult to work.

In any case, you need to contact a car service to identify the exact cause of the malfunction.

Acceleration crashes

It is not uncommon for the “seven” to start up confidently, the engine keeps its speed perfectly, and the driver does not experience discomfort when driving at medium speeds. But as soon as the car leaves the open road, it is very difficult to pick up speed: when you press the gas pedal, you feel dips in the engine.

The cause of this malfunction may be hidden in the following elements of the carburetor:

• the jets are clogged, so air and gasoline do not enter the combustion chamber in the required volumes;
• diffusers and accelerator pump are not working properly.

In this case, it will be necessary to clean the carburetor and check its elements for wear and mechanical damage.

The smell of gasoline in the cabin

Strictly speaking, the cabin can only smell of gasoline when excess fuel is released from the carburetor. That is, the smell is the first sign that candles will soon be filled.

The smell of gasoline while driving and parking is a serious reason to check the performance of the carburetor

Fills the candles

This symptom of a carburetor malfunction can be detected without turning on the ignition. As a rule, if excess fuel is released to the surface, it is the spark plugs that are the first to suffer. In the most serious cases, puddles of gasoline can accumulate under the car.

Fuel transfusion is possible for a number of reasons, but most often this occurs due to breakdowns in the fuel return system. It is recommended to clean all gasoline supply channels, as well as check the pumping unit: it is quite possible that the pump is operating in heavy duty mode.

The engine fires

This concept can be associated with transfusion. If there is a fuel leak from the carburetor, then it can start to shoot (sneeze), that is, twitch during operation, and in the most serious cases, ignite. Of course, it is not safe to operate such a car, so disassembling the carburetor and washing it is required.

The engine stalls when you press the gas pedal

Another malfunction is associated with the inability to move off: the engine starts, runs smoothly, but as soon as the driver presses the gas, the engine immediately stalls. The reason for this problem lies in the lowering of the fuel level in the float chamber. There is only enough fuel to start the engine, and when you sharply press the gas pedal, the fuel flow is completely blocked, so the engine stalls.

Adjusting the carburetor VAZ 2107

The carburetor is a device that does not require daily inspection and special maintenance. However, a good setting and periodic adjustment will benefit the carburetor: the procedure is recommended for drivers whose cars have clearly begun to “hand over”:

• the engine began to consume a large amount of gasoline;
• decrease in speed and power;
• periodically there are troubles with ignition or acceleration, etc.

Properly adjusted carburetor adjustment can optimize engine performance.

The necessary arsenal for setting up work on the carburetor is already available

Preparing for adjustment: what the owner of the VAZ 2107 should know about

The key to success is thorough preparation. Therefore, it is necessary to pay attention to the conditions under which and with what tool these works will be carried out.

First you need to prepare a “front of work”, that is, make sure that the engine is cool, and there is no dirt and dust on the carburetor body and near it. In addition, you should stock up on rags, since when unscrewing some parts, gasoline leaks are possible. It is important to create comfortable adjustment conditions for yourself - ventilate the room and take care of the lamps and lamps so that you can see each element.

Next, you need to assemble the tools that will be used in the adjustment. The carburetor on the VAZ 2107 is unpretentious and structurally simple, so you only need:

• standard set of open-end wrenches;
• crosshead screwdriver;
• flat screwdriver;
• ruler for measurements.

To clean the cavities of the device, it is recommended to buy special liquids.

Before adjustment, you can clean the carburetor with special fluids.

And the last stage of work (which is important!) is to find a service book for your car. The fact is that for each modification of the VAZ carburetor there are parameters for optimal operation. It is with these parameters that you will need to check when adjusting.

Enrichment and depletion of the mixture: why is it needed

The carburetor forms the fuel-air mixture, taking into account strict proportions. At high speeds, it enriches the mixture, changing proportions to make the engine work easier. However, in some cases, the proportionality may change and this is not always convenient for the motor and the driver.

Therefore, the first thing with which they begin to adjust the carburetor on the VAZ 2107 is the enrichment or depletion of the mixture:

1. Start the engine.
2. After warming up the engine to operating temperature, turn off the ignition.
3. Remove the air filter housing to make it easier to work with the carburetor body.
4. Next, tighten the quality screw and the fuel quantity screw until it stops.
5. Then unscrew each of them exactly three turns back.
6. Switch on ignition.
7. Check the parameters indicated in the service book: it is necessary to tighten the screws until the number of revolutions at idle is equal to the factory values.

Video: mixture adjustment instructions

how to adjust mixture on carburetor

After that, you can proceed to other stages of regulating the operation of the carburetor.

We reduce fuel consumption

The main reason why VAZ 2107 owners decide to carry out adjustment work is due to high fuel consumption. However, simple actions can reduce consumption, it is important to follow the instructions. As you know, the float is responsible for the fuel level in the float chamber. As a rule, after adjusting the enrichment / depletion of the mixture, the float should fall into place, however, if it has risen above the norm, then the fuel consumption will be consistently high.

Float adjustment is necessary not only to reduce gasoline consumption, but also to reduce exhaust toxicity.

Before adjusting the float, you need to remove the air filter housing and unscrew the screws that hold the carburetor cover. After that, direct access to the float chamber opens:

1. The float stroke must correspond to 8 mm (this is a typical parameter for all VAZ 2107 carburetors). Accordingly, if the float is above this norm, then the consumption of gasoline will increase, if it is lower, then due to fuel losses, the car will sharply lose its dynamism.
2. Using your fingers and a screwdriver with a thin flat blade, it is necessary to adjust the float mounts to a norm of 8 mm.
3. After fitting, it is recommended to re-measure the level of its position.
4. Next, screw the carburetor cover back into place.

Video: instructions for optimizing fuel consumption

Carburetor reduce fuel consumption ourselves

Idle adjustment

After working with the float, you can begin to adjust the idle speed of the carburetor. It is important that the engine is well warmed up and the air filter housing is left aside:

1. Close the quality screw to the stop, then unscrew it 3-4 turns back.
2. Start the engine.
3. Turn on all lighting devices, acoustics, stove - you need to create the maximum load on the carburetor.
4. In this mode, set the number of revolutions equal to 750–800 units / min.
5. The quality screw must be in a position that achieves a maximum idle speed of no more than 900 rpm.
6. After that, carefully tighten the quality screw back until jerks are observed in the operation of the motor. Here it is worth stopping and returning the screw one turn back.

Idling adjustment on the VAZ 2107 is necessary to save fuel and stable engine operation.

Video: instructions for adjusting xx

DO IT YOURSELF. Idle adjustment!

Equally important in the adjustment is the correct selection of jets. In most cases, drivers simply change jets to make it easier for them to maintain carburetors.

Table: jet parameters on DAAZ carburetors

designation carburetor	VAZ engine	Atomizer mixture I chamber		Atomizer mixture chamber II
		designation	Marking	designation	Marking
2107-1107010; 2107 – 1107010 – 20	2103; 2106	2105 – 1107410 Feet	3,5*	2107 – 1107410 Feet	4,5*
2107 – 1107010 – 10	2103; 2106	2105 – 1107410 Feet	3,5*	2107 – 1107410 Feet	4,5*

Table: jet marking

Carburetor designation	Fuel main system		Air main system		Fuel idle		Air idle		The jet will speed up. pump
	I little	II kam.	I little	II kam.	I little	II kam.	I little	II kam.	warm	re- start-up
2107-1107010; 2107 – 1107010 – 20	112	150	150	150	50	60	170	70	40	40
2107 – 1107010 – 10	125	150	190	150	50	60	170	70	40	40

How to replace a carburetor on a VAZ 2107

This question can take an inexperienced driver of the "seven" by surprise. But in fact, the procedure for replacing the carburetor is not difficult. The only thing that the driver can confuse is the connection points of certain hoses. Therefore, it is recommended to sign where and which hose should be connected to the new carburetor.

The presence of a large number of mechanisms, hoses and wires can frighten an inexperienced driver

How to remove a carburetor from a car

Dismantling work must be carried out only on a cold engine to avoid the possibility of injury. Due to the fact that the carburetor is located on the intake manifold, this part can cool down for a very long time - you need to keep this fact in mind.

Usually, all elements connected to the carburetor are disconnected without problems.

Dismantling the device takes an average of 7-12 minutes:

1. Remove the air filter housing so that you can crawl to the carburetor.
2. First of all, two thin wires must be disconnected from the device: one of them feeds the throttle valve, the second - air.
3. Next, disconnect the economizer return spring.
4. Use a screwdriver to loosen the clamps on the large gasoline supply pipe and remove the hose. Beforehand, it is necessary to place a rag under the carburetor so that the outflowing gasoline does not blur under the car.
5. Remove the fuel return hose (it is thinner than the main one).
6. Unscrew the ventilation and vacuum hoses (they are even thinner).
7. After that, it is possible to dismantle the carburetor itself from the car. The body of the device is fixed to the intake manifold with four nuts that must be unscrewed.
8. The opened hole in the collector must be immediately closed so that dust does not get inside.

Video: dismantling work

how to remove a carburetor from a vaz 2107

Of course, it is recommended to install a new carburetor only after cleaning the joint. Over the years of operation of the mechanism, the surface of the collector could be covered with soot, dust and fuel smudges.

Don't forget the lining

Depending on the year of manufacture of the VAZ 2107, between the carburetor and the intake manifold there could be gaskets made of a variety of materials: from metal to cardboard. Regardless of the degree of wear of the existing gasket, it will need to be replaced with a new one.

It is important to choose a gasket from the same material as the original, since only in this case it will be possible to achieve a reliable connection. Accordingly, after removing the old carburetor and cleaning the joint, it is necessary to install a new gasket.

For any work on the carburetor, it is recommended to change the gasket element to a new one.

How to install a new carburetor

Installing a new carburetor is done in the reverse order of removal:

1. The device is mounted on four studs and screwed with nuts.
2. The next step is to connect. The first step is to connect the hoses for ventilation and vacuum.
3. Then connect the hose to the return line and the hose to the gasoline supply. Clamps are changed immediately.
4. After connecting the EPHX wire, it is fixed on the carburetor solenoid valve.
5. Return the damper spring to its place and connect two thin wires to the valves.

The correctness of the installation is checked by the stable operation of the motor

After that, the procedure for replacing the carburetor is considered completed.

Video: installation work

Thus, the driver of the "seven" can foresee all the troubles associated with the carburetor and take timely action. In addition, relatively simple carburetors were installed on the 2107 models, so most of the diagnostic and adjustment work can be done independently.