VAZ 21074 Injector High Fuel Consumption Reasons • Electric fuel pump

After they released a car with distributed injection, car enthusiasts are interested in what the fuel consumption of the VAZ 2107 (injector) is. The reason for this curiosity lies in the higher fuel consumption than the manufacturers indicate.

The VAZ car is familiar to every Russian. Since 1982, the VAZ 2105 was replaced by a new model - the “seven”, that is, the VAZ 2107. This was visible in the changes that the car underwent.

They hid in changing the appearance of the hood, adding some details inside the car, and an aggressive radiator grille appeared. City of production – Nizhny Novgorod, Russian Federation.

The fuel consumption of a VAZ 2107 per 100 km with injectors of the AI-92 and AI-95 brands is presented as follows:

• on the highway - 6.7-8.5 liters;
• in urban conditions - consumption increases to 11.5 liters.

Plus, the factors of gasoline quality and the driving style of the car enthusiast are added to everything. Therefore, some have more consumption, others have less.

Expert advice

After completing the procedure for adjusting the VAZ-2105 carburetor device, experienced auto mechanics recommend paying attention to the following critical points:

1. Valve location - is in the retracted position, with the idle speed jet touching the seat in the carburetor body.
2. Lubricating the rubber seal with special motor oil.
3. The location of the air damper intended for cold passage is in a vertical plane, while the suction handle is lowered.
4. The condition of the solenoid valve - the presence of damage and malfunctions is checked as follows:
   turn on the ignition;
5. remove and put the connector on the valve;
6. listen to the sounds coming from the solenoid valve.

If clicks are heard during the inspection process, the part is in full working order.

Setting the ignition timing

When the ignition timing is correctly set, all indicators of engine performance (reactivity, power, idling, energy consumption) are within normal limits. To carry out the work, you must have a strobe and a tachometer, an open-end or socket wrench of 10. In general terms, the setup is done as follows:

• The engine warms up to operating temperature. Low idle speeds are set by ear or on the tachometer (less than 800 rpm), after which the engine is turned off.
• On the gearbox housing, look for a hatch with a visible part of the flywheel and a scale. Most often it is closed with a rubber stopper that needs to be removed.

By turning the flywheel with a screwdriver, the long alignment mark is located. The lead angle is 0 degrees if the mark is opposite the triangular notch on the scale. In this case, the pistons of cylinders 1 and 4 are at top dead center.

The strobe light is connected and the engine is turned on to idle. A flashing strobe beam is directed into a hatch with a scale. In the beam, the highlighted mark should be opposite the desired scale division, where each division corresponds to one degree of ignition timing.

The advance angle is adjusted by rotating the distributor (ignition distributor housing). Clockwise - the advance angle increases (early ignition), counterclockwise - decreases (late ignition). When the desired angle is set, the engine is turned off, the strobe light is turned off, and the distributor is secured.

VAZ 21074 injector engine speed drops

RTD, TPS - decipher it

By the way, this morning, it started up, warmed up to 30 degrees, I drive out of the parking lot, press the brake, the revs drop, the car stalls, I start it, drive a few meters, the situation repeats again, drive 30 meters, turn off the car, wait, start it, drive off, everything is ok, revs don't swim.

RTD, TPS - decipher it

RTD, TPS - decipher it

If only a person could immediately translate this Rotary Piston Engine into an understandable language

There is no time to check everything. Today the error came out - rich mixture. Before that, about 600 kilometers away, an error appeared on the oxygen sensor. did not light up after reset.

Added after 6 minutes 38 seconds:

By the way, there are ways to check the DMRV.

air consumption 15-17 at idle. it seems to have definitely died, judging by this indicator, I looked on the Internet and they write that the air flow should be up to 10 liters, but damn I don’t remember that such a flow would have been since the installation of the BC, it turns out that the car traveled about 60 tons on a faulty mass air flow sensor. km.

I dug up an interesting article on the parameters of injection engines (including classics) https://motorhelp.ru/122-tipovye-parametry-dvs-vaz.html

Previously, the solution was to remove the terminal from the battery, now even this does not help!

So that’s the problem - BC (State 07X1-M) does not give an error! The car is new, mileage 15,000.

Perhaps the firmware is crooked, at 15k km this happened, when you turn off the car and start it again the twitching disappears. On 2 computers on the same machine there was such a problem, and everything was without errors (after a week). I read a lot of information on this topic - many people had this problem, then the problem went away by itself. I had symptoms at about 15 thousand km: I’m driving, everything is fine, I brake in a traffic jam, the speed jumps from 1000 to 3000 rpm, I turn it off, start it, everything becomes normal - 800 rpm. If you have the same problem, try to be patient a little, tighten the clamps so that there is no air leakage. if the problem is permanent, i.e. every trip, then take it to the warranty if you have gone through all the maintenance. If you are out of warranty, then it’s best to start looking at the sensors. and change the air filter))))

Regarding my problem, I will look at the sensors today))))

By the way, I read somewhere on the forum that the mass air flow sensor can be checked in another way: on a warm car, accelerate it - as a result, the air flow should increase sharply by about 200 kg, for me it does not exceed 90 kg

High fuel consumption after VAZ engine repair

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After the capital, the consumption per 100 km is quite high, about 10 liters is this normal?

Dimooon85

this is a city + highway, before the repair it was where that 7-8
Nerv_
I didn’t measure compression

Holy shit, I personally can’t imagine how this can be achieved.. I have about 12.5. The engine was overhauled 5000 ago, less than half a year has passed. True, I have 1.5. I don’t drive slowly, but I don’t fly either, I don’t look for my Kamaz trucks. The carburetor was adjusted, I have no complaints about it, I start with half a turn in any frost... Yes, everything is great, but the consumption is huge.

Personally, I can’t imagine how this can be achieved.

your driving style increases consumption by up to 50%, maybe you hold the gas from traffic light to traffic light, and then brake sharply? If you use coasting, engine braking, lower gears, and calculate the traffic situation (reduce speed in advance of the intersection so that when the traffic light turns green, you can continue driving instead of moving away) - then you can achieve good fuel consumption, although this is called “vomiting in the right lane” . Much also depends on the place where you live and travel - “in Moscow there are such traffic jams that women in labor with ten-year-old children are brought to the maternity hospital,” and somewhere in a quiet small city you can drive 15 kilometers from one end to the other in 15 minutes. I got a little distracted on a philosophical topic.

After repair, the compression should be at least 12.5 points and the same across the cylinders, but until the engine has been run-in, it may be less; in my first thousand it was 10.5, then it increased to 12.5.

What needs to be done to optimize fuel consumption

Try to drive without sudden braking or sudden acceleration. To ensure that the actual consumption of the VAZ 2107 does not exceed the norm, replace the use of mineral motor oil with synthetic one.

Check your vehicle regularly and replace the air filter if necessary.

Gasoline consumption 2107 per 100 km (and regardless of the kilometers traveled) at normal vehicle speed also depends on the quality of the fuel, so try to purchase it at large network gas stations. The saving of fuel and your financial resources depends on the technical condition of the car.

Engine power system

Conventionally, the power supply system can be divided into two elements:

1. Air supply;
2. Fuel supply.

Let's consider the first option. If your car consumes too much gasoline, the problem may lie in a dirty air filter. All drivers should know that without oxygen, fuel combustion is impossible. Fuel consumption should be carried out in a ratio of 1 kg of fuel to 15 kg of air. This parameter is not always present, but should have approximate values.

If the air filter is dirty, it will turn out that fuel combustion will be poor, which means the engine efficiency will decrease, which is the reason why the VAZ 2107 carburetor has high fuel consumption, but there are other reasons, which lie in the operation of the carburetor itself .

If it is not set correctly, the Lada will have an air/fuel mixture that is too rich or too lean. In both cases, it consumes a lot of fuel and noticeably loses power. To get rid of the problem, you need to configure the system correctly. If the VAZ 2107, or more precisely, its carburetor, still consumes a lot of gasoline and has difficulty starting, then you should check the cleanliness of the fine and coarse filters.

Electric fuel pump

Its task is to monitor the presence of residual oxygen in the burnt gases, that is, if oxygen means a lot, the mixture was lean and the ECU must be commanded to increase the mixture. In addition to adjusting the operation of the engine power system, you can follow a number of simple tips that will help you really increase the efficiency of the engine and significantly reduce fuel consumption, regardless of whether you have an injection engine or a carburetor.

REAL PETROL CONSUMPTION ON VAZ MODELS

Real fuel consumption on the VAZ 2114 (as well as on the VAZ 2113 and 2115) often differs from the factory values. Mainly differs in the direction of increase. Of course, a lot depends on weather conditions. In winter, due to long and frequent warm-ups of the car, gasoline consumption increases, and other factors also influence fuel consumption:

• Driving style. Driving with sudden acceleration and high speed does not save fuel;
• Various malfunctions: in the engine, in the ignition system, in the fuel system, etc.;
• Unregulated tire pressure;
• Driving on a cold engine;
• Fuel quality.

It is necessary to take into account that the fuel consumption of the VAZ 2115 (2113) is practically no different from the gasoline consumption of the 2114 model, since the cars have very similar characteristics and are equipped with exactly the same engines.

Change the air filter in a timely manner. Car insulation

• Kia Rio
• VAZ 2107
• Hyundai Getz
• Hyundai accent

Is it worth installing a new engine?

A fairly common question is whether it is worth installing a new engine or modifying the original one. As previously noted, the VAZ 2105 engine design was first assembled several decades ago, and the power is at the level of 64 horsepower. Even with significant improvements in design, you can count on about 120 horsepower. In this case, other elements of the fuel system will also have to undergo tuning, and the service life of the engine may be significantly reduced. Therefore, if financially feasible, another engine with a more advanced design should be installed.

The installation of another engine can only be carried out by a professional who has already performed similar work. However, not all engines will fit the car in question. Therefore, this kind of modification can only be carried out in a car service center.

However, if it is not possible to buy a new engine and install it on the car, you can also perform minor tuning, which will increase the engine power. Let's take a closer look at several of the most popular methods.

Fuel mixture quality adjustment screw Solex 21083

Why do you need a Solex 21083 carburetor quality screw?

The quality screw is necessary to change the composition of the fuel mixture entering the car engine at idle (idle). By turning the screw we lean the fuel mixture, by turning it away we enrich it. In this way, you can adjust the air/gasoline ratio to ensure it operates at a minimum stable idle speed.

Where is the quality screw installed on the Solex 21083 carburetor?

The fuel mixture quality adjustment screw is installed in the lower part of the carburetor body, at the outlet of the emulsion channel. The screw is screwed into a special channel at the bottom of the carburetor body. It changes the flow area of ​​the outlet.

The outlet of the CXX Solex 21083 through which the fuel mixture is sprayed, the composition of which is regulated by a quality screw.

How does a Solex 21083 quality screw work?

The Solex 21083 carburetor quality screw is a metal screw of a certain shape with a thread. A rubber O-ring is installed on it to prevent excess air from entering the CXX channel. One end of the screw has the shape of a needle; the other has a cut for a 3 mm slotted screwdriver. See photo at the beginning of the article.

How does the fuel mixture quality adjustment screw work?

The easiest way to see how the quality screw works is in the Solex 21083 CXX diagram.

Under the number “14” is the quality screw.

A mixture of air and gasoline (fuel emulsion) is formed at the CXX fuel nozzle, where gasoline entering the carburetor CXX from the float chamber and air from the air duct are mixed. Under the influence of vacuum at the edge of the throttle valve of the first chamber, it is pulled through the emulsion channel and the CXX outlet into the engine intake manifold. The engine runs on this fuel mixture.

If we tighten the quality screw all the way, we will completely block the outlet of the emulsion channel of the idle system. Fuel stops flowing into the engine and it stalls.

If you turn the quality screw out a little, fuel will begin to flow into the engine and it will idle.

In order for the car engine to operate stably at idle, you should unscrew the quality screw at least half a turn from the stop and adjust the idle speed with setting the position of the fuel mixture quantity screw. It is necessary to achieve such a mutual position of these two screws that the idle speed is 650-700 rpm and the CO content in the exhaust gases is within normal limits.

Malfunction of the fuel mixture quality screw

There are only two malfunctions: clogging of the idle air system outlet and damage to the rubber O-ring on the screw.

Over time, the idle air system outlet becomes clogged with deposits and soot from the engine intake manifold. The quality screw needle ceases to play the role of a locking device, since the hole is already clogged. Depending on the degree of contamination, the engine begins to idle unsteadily or the idle speed disappears altogether. When turning the quality screw when adjusting the XX speed, the reaction will be weak or not at all.

You can quickly clean the outlet, quality screw and emulsion channel yourself without disassembling the carburetor using a cleaning aerosol. Details about the cleaning procedure: “Cleaning the idle system of the Solex carburetor 2108, 21081, 21083.”

The channel where the quality screw is installed leads directly to the CXX emulsion channel and its outlet. Therefore, this is one of the places where foreign air is likely to “suck” into the carburetor. Foreign air depletes the fuel mixture, as a result of which the engine does not have enough energy to rotate the crankshaft at idle, and it begins to “triple” and tries to stall. The reason for the air leak is a worn rubber o-ring on the quality screw. It may fail due to age or careless repairs.

Replacing the ring with a new one will help correct the problem of air “sucking” into the carburetor and restore normal idle speed of the car engine.

Notes and additions

If, with the quality screw fully tightened, the car engine does not stall, but continues to run, you should look for places where fuel is likely to enter the engine in addition to the carburetor idle system

Or pay attention to the position of the throttle valve of the first chamber. Perhaps it is very slightly open and in addition to the outlet hole of the CXX, underneath it there is an exit slot of the transition system of the first chamber and the fuel is drawn out of it by vacuum

The position of the throttle valve is regulated by the quantity screw, which with its tip rests on the lever on its axis.

Lada 2108 Color Black › Logbook › Solex carburetor, my settings and my consumption.

Hello everyone, my friends asked me here on the drive, what is the secret of low consumption and what are the settings of my Solex 83 carburetor.

I will tell you in order what and how I did and tried, I will describe my thoughts about the setup.

There are 3 variants of accelerator pump elephants

and this is precisely the first question about my carburetor.

Well, here are the types of elephants:

The standard elephant was hitting who knows where, and when the damper was opened, the drops that remained on the wall began to drip. I set it up so that when it opens, the jets shoot out without touching each other.

what did all this give me, the Solex has 2 modes, I call them up to 100 km per hour

, and after 100 km per hour.

Well, so if I drove in the city cycle without pressing the pedal to the floor, the car drove rather sluggishly! and when the pedal was pressed sharply, a simply indescribable failure appeared. Why? I noticed that despite the fact that we drive quietly and we have 1 chamber working, the supply goes to 2 chambers and in the second chamber there is stagnation of fuel, I checked at home and the stagnation was about 6mm of fuel. It was decided to abandon this elephant.

consumption is approximately 11 liters per 100 km in the city + failures.

The elephant out of 90 saved me from failure, the car simply cruised up to 100 km/h, but the car became stupid after 100 km/h. Consumption increased to 12-13 liters.

I tried to adjust the elephant, but one horseradish at the beginning it turned out to be drops, and then a stream.

Well, why did the consumption increase? It seems like elephant 1 is the same 35 to 40, but the consumption has increased.

the answer is in disarray. As I understand it, due to the fact that the 1st elephant and the 2nd are at the same level, the air begins to pull fuel from the elephant, as it were, even if you do not press the gas pedal.

here the elephants are at different levels and the fuel does not draw, it also makes it possible to configure the elephant so that the streams come out immediately when you lightly press the gas pedal, without touching the walls and without forming drops. Thus, the air and the mixture mix better, forming “fog”.

When setting up, do not allow the jets to cross, this will lead to the formation of a drop.

my choice fell on the Travnikov elephant, with it the consumption decreased to 10 liters, and the car was a gem up to 100 km/h and after 100 km/h the elephant costs 35 to 40.

The next step was cleaning the carburetor and channels, with blowing.

Regarding the idle speed and the idle air valve.

there is a small nick with this jet on the valve.

trick, the next one my jet was 35

and no matter how you set the idle speed, the car didn’t seem to accept it, the idle speed was constantly jumping, cured by replacing it with 52

jet, the speed has leveled off.

there is one more problem with this valve, oh I’m tired of it... wow...

If you tighten the idle too much, it will disappear; if you tighten it too weak, you will either suck in air, or the needle will not close enough and the fuel will go empty.

the ratio of fuel and air jets in my car... the sweetest...

in the primary chamber there are the following 92.5 fuel to 135 air. (per liter 15 liters of air per 1 liter of fuel)

in the secondary it costs 92.5 fuel to 125 air. (according to the literature, 13 liters of air per 1 liter of fuel, the mixture is over-enriched, not significant, which is why the car continues to pick up speed after 100 km per hour, and does not stall)

Solex carburetor. How to reduce consumption by selecting jets

This is a fairly simple and effective way to increase the efficiency of a gasoline engine. The essence of the method is to select fuel jets for the main dosing system. The jet is selected only for the first chamber and the idle system is adjusted.

To carry out the manipulations, you need to prepare a plastic bottle, marked 100 ml, into which gasoline is poured. You also need a set of jets of a smaller cross-section compared to standard ones and a larger cross-section (idle). A relatively flat and deserted section of the route is selected. Selection method:

• The engine warms up to operating temperature (about 90 degrees).
• A bottle of gasoline is installed under the hood. The suction fitting of the fuel pump is disconnected from the fuel hose and connected to the bottle with another hose.
• A control section is driven through at an optimal speed of 60-70 km/h and the fuel level in the bottle is measured.
• The carburetor cover is removed, the jet is changed to another, smaller cross-section (for example, 107.5 to 105). After this, the used fuel is measured again at the control section. At the same time, the dynamics of the car and the appearance of dips when pressing the accelerator are carefully monitored.
• In a normal situation, you can change the jet to an even smaller one. When failures occur, the experiments are stopped. After this, the idle speed is adjusted.
• The idle fuel jet is changed to a similar one, but with a larger cross-section (for example, 40 to 42), the speed is adjusted, and a test run is performed.
• If, as a result of the adjustment, the dips disappear, the adjustment was successful; if not, the idle jet is changed to an increased one and the race is carried out again.

Statistics

The fuel consumption of a Lada 2107 with an injection engine is perfectly shown by statistics provided by the manufacturer and figures received from car enthusiasts.

The manufacturer claims that when driving on the highway, the car will normally consume 9 liters of gasoline, but in reality we see that consumption does not exceed 7.75 liters.

Driving in urban conditions should consume only 9.70 liters, but here the figure exceeds 10.25 liters. With a mixed type of driving, the readings from the manufacturer and the car enthusiast practically coincided, the former had a consumption of 8.50 liters, and the latter - from 8.82 liters. However, we see that in practice the consumption is higher.

The passport does not indicate how much gasoline is consumed when driving off-road. Having checked it ourselves, we see that such driving requires more than 9 liters of fuel.

Principles of gasoline consumption

To reduce your car's fuel consumption, you need to know that part of the energy released during combustion of the mixture is spent not on ensuring the movement of the vehicle, but on the operation of additional equipment. You can reduce the amount of fuel “eaten” by a machine by limiting the use of certain components and systems. Naturally, you won’t be able to save on lighting fixtures and side lights - you shouldn’t drive in the dark without headlights, and besides, the Rules provide for low beams to be turned on when driving. But there is no need for constant operation, for example, of an air conditioner, and reducing the frequency of its operation will allow significant savings.

It is also worth noting that cars with an automatic transmission, compared to cars equipped with a manual transmission, have an increased appetite - this is the price their drivers have to pay for an easy start and no need to change gears.

Tires have a big impact on consumption. Thus, the rolling resistance coefficient for diagonal tires is higher than for radial tires. This figure may vary depending on the speed. If the car speed does not exceed 60 km/h, then the coefficient is stable, but as it increases, it increases sharply - for example, when driving at a speed of 110 km/h, it has a significantly higher value than at 70 km/h.

In addition, the rolling resistance coefficient is inversely proportional to the pressure inside the wheel and the temperature of the rubber - as these indicators increase, it decreases. The size of the tire and the condition of the road surface also matter - a large wheel experiences less resistance when rolling than a small one; on a flat road this coefficient also decreases due to lower energy consumption.

Consumption increases noticeably in winter, the reason being the contamination of the road surface. Winter tires are certainly needed at this time, but while increasing the level of safety, they become one of the reasons for increased fuel consumption. However, you should not think that using summer tires in winter will have a beneficial effect on gasoline consumption, since, in addition to the increased risk of accidents, such tires will cause slipping to become more frequent.

Causes of increased consumption and their solutions

Fans of domestic cars often contact the service with a similar problem. And it’s not at all strange, because no one wants to pay more when there are working ways to reduce gasoline costs. For people who need to constantly travel for work or other errands, this will save a large amount of money. It’s time to spend the latter in the right direction. The reasons why the carburetor begins to consume more fuel may be the following:

• uneconomical driving style, which extremely often happens among those car drivers who have been driving for quite a while and want to squeeze all the possible juices out of the car;
• inaccurate readings of instruments that show the level of gasoline in your fuel tank;
• errors in the speedometer operation.

Standard (average) fuel consumption is usually indicated in the vehicle documentation.

They usually indicate consumption in three modes of vehicle operation:

• 90 km/h;
• 120 km/h;
• driving in an urban environment.

Professionals will easily answer that the most economical mode, in which fuel consumption will be minimal, is driving at speeds of up to 90 km/h when your car is driving on a flat road. In this case, only one carburetor chamber works. But if you are approaching a speed of 120 km/h or have already crossed it, then the second chamber of your carburetor will definitely open. In such a situation, fuel consumption usually increases by one to two liters per 100 kilometers.

We learn to adjust the carburetor VAZ 2103, 2105, 2106, 2107 independently

• We learn to adjust the carburetor VAZ 2103, 2105, 2106, 2107 independently
• How does a VAZ 2107 carburetor work?
• Carburetor components
• Carburetor systems
• How to set up a carburetor
• Checking the condition of the mesh filter
• Setting up the float chamber
• Adjusting the starting system
• Adjusting the idle speed of the VAZ carburetor

Owners of VAZ 2103, 2105, 2106, 2107 cars have probably encountered the need to adjust the carburetor. The first desire that arises in your mind is to stop by the service station and solve all your problems. But there is no need to rush to the experts, because you can do the adjustment of the VAZ 2107 carburetor yourself. You will need time, patience and some knowledge of the design and operation of this unit.

• How does a VAZ 2107 carburetor work? Carburetor components
• Carburetor systems

How to set up a carburetor

• Checking the condition of the mesh filter

Adjusting the float chamber Adjusting the starting system Adjusting the idle speed of the VAZ carburetor

How does a VAZ 2107 carburetor work?

To independently adjust the carburetor, it is useful to know what components and systems it consists of. To provide the engine with high-quality fuel, the carburetor systems must work “like a clock.”

Carburetor components

The components of the VAZ 2107 carburetor are:

• Float chamber.

• Idle air valve.

• Crankcase gas exhaust compartment.

• Air and fuel jets.

Carburetor systems

For high-quality operation of the car engine, you will need flawless operation of the carburetor systems:

1. Engine starting and warming up system.

2. Idle system.

3. Constant fuel level monitoring system.

4. Acceleration pump (to guarantee acceleration of the car).

5. Large diffuser in the carburetor body, VTS sprayer, air and fuel jets, emulsion tube and emulsion well. Their location is the main dosing chamber.

6. Econostat system. This is an enrichment device in the second internal combustion chamber of the engine.

To adjust the carburetor, you need calibration data, which describes all the necessary values ​​for adjusting the VAZ 2107 carburetor. Having started adjusting the carburetor, you need to check the operation of all components and systems that control the operation of the carburetor. To do this, the check must begin with external control elements. Check the throttle valve actuator for full travel of the throttle valve actuator lever. When the gas pedal is released, the throttle valves in both mixing chambers must be completely closed. The gas pedal is depressed to make sure that the throttle valves operate smoothly and without jerking, sequentially (first in the primary chamber, and then in the secondary chamber, they fully open and become vertical, opening the throat completely).

Modifications

• VAZ-2107 (engine 2103, 1.5 l, 8 cells, carburetor)
• VAZ-21072 (engine 2105, 1.3 l, 8 cl., carburetor, timing belt drive)
• VAZ-21073 (engine 1.7 l, 8 cells, mono injection - export version for the European market)
• VAZ-21074 (engine 2106, 1.6 l, 8 cells, carburetor)
• VAZ-21070 (engine 2103, 1.5 l, 8 cells, carburetor)
• VAZ-2107-20 (engine 2104, 1.5 l, 8 cells, distributed injection, Euro-2)
• VAZ-2107-71 (1.4 liter engine, 66 hp engine 21034 for A-76 gasoline, version for China)
• VAZ-21074-20 (engine 21067-10, 1.6 l, 8 cells, distributed injection, Euro-2)
• VAZ-21074-30 (engine 21067-20, 1.6 l, 8 cells, distributed injection, Euro-3)
• VAZ-210740 (engine 21067, 1.6 l, 53 kW/72.7 hp, 8 cells, injector, catalyst) (2007 onwards)
• VAZ-21077 (engine 2105, 1.3 l, 8 cl., carburetor, timing belt drive - export version for the UK)
• VAZ-21078 (engine 2106, 1.6 l, 8 cl., carburetor - export version for the UK)
• VAZ-21079 (rotary piston engine 1.3 l, 140 hp, originally created for the needs of the Ministry of Internal Affairs and the KGB). Years of production: 1986—1991
• VAZ-2107 ZNG (engine 21213, 1.7 l, 8 cells, central injection)

Basic mechanisms and systems

To perform its functions, the carburetor has the following systems and mechanisms:

1. System for maintaining the required fuel level;
2. System for starting and warming up a cold engine;
3. Idle system;
4. Main dosing system;
5. Acceleration pump;
6. Econostat system.

Good old VAZ: love for life The three systems listed first in the list are subject to configuration. The VAZ 2105 carburetor in question can be adjusted without removing it from the car. Since the units of cars of models 2105 and 2107 are identical in structure and differ only in the diameters of the holes of the fuel and air nozzles, in the same way it will not be difficult to make a similar adjustment for the VAZ 2107.

How does this system work?

In order to correctly determine in the future why you are using a lot of fuel, you need to know how the engine power system works. With this knowledge, you will already know how to reduce the fuel consumption of your UAZ.

After air enters the intake manifold, the volume will be measured by a certain sensor. All this information will then go to the ECU. The process will receive the task of injecting fuel through an injector, or, to be precise, through injectors. Everything that is released into the atmosphere is detected by the exhaust measurement sensor. The data obtained helps determine the actual fuel consumption.

Already with knowledge about the operation of the entire system, it is easier to find the exact reason for the unreasonably high consumption of gasoline.

Understanding the basics of how engine power works is important for developing a vehicle operating culture. This will reduce the consumption of expensive fuel and, along with it, the operating costs of the VAZ 2107. The distributed injection system works as follows:

1. The air enters the suction manifold through the filter, its volume is measured by a special sensor. The data is transmitted to the ECU, which also receives information about the temperature of the coolant and the level of CO in the exhaust and the like.
2. The process, in accordance with the algorithm embedded in it, issues a command to inject a portion of gasoline through an injector, or more precisely, an injector. Fuel consumption is also determined by turning the throttle; pressing the accelerator hard causes a long period of opening of the fuel valve.
3. Combustion products are released into the atmosphere through the exhaust manifold, in which the catalytic converter is installed. It has a sensor that measures the level of active oxygen; this data also affects the fuel consumption of the VAZ 2107 engine.

Knowing the principle of operation of the injection system, you can determine the range of reasons that affect the fuel consumption of a car. Eliminating identified faults will help bring high gasoline consumption to the rated values ​​and even reduce it somewhat.

Economy driving skills

Drivers are taught proper driving techniques at a driving school. When operating the domestic “classic” VAZ 2106, you need to take into account a number of points:

1. The first gear of the car is quite “short”. You shouldn’t rev the engine too hard; once you’ve started moving, go to second speed.
2. Frequent sudden accelerations and stops are a real scourge for any car; along with excessive consumption of gasoline, the wear of parts and components accelerates. Move more calmly, try to stop as little as possible, use the inertia (rolling) of the car.
3. On the highway, maintain cruising speed at all times. The optimal value for the “six” with a four-speed gearbox is 80 km/h, with a five-speed gearbox – 90 km/h.
4. When coasting down a mountain, do not turn off the speed - brake the engine and watch the tachometer. When the needle drops below 1800 rpm, shift to neutral or low gear.
5. In a city traffic jam, don’t turn off the engine in vain. If the idle time does not exceed 3-4 minutes, stopping and starting the engine will “eat up” more fuel than idling.

Moving along busy city streets, experienced drivers monitor the signals of distant traffic lights. If you can see a green light in the distance, there is nowhere to rush - by the time you get there, you will come under a red one. And vice versa, if you notice a red signal, it is better to speed up and drive under the green one. The described tactics allow the motorist to stop less at traffic lights and thus save fuel.

Against the backdrop of rising fuel prices, driving outdated cars becomes doubly expensive. The “six” needs to be constantly monitored and repaired on time, so as not to pay extra money for gasoline. Aggressive driving is not at all compatible with carburetor “classics”, where the power of the power unit does not exceed 80 hp. With.

All carburetors manufactured on the plant's assembly line always undergo careful control. However, despite strict control, it is difficult to obtain similar characteristics of carburetors, because it is very expensive for mass production. As a result, carburetors differ in fuel mixture consumption by eight percent, and they differ from each other by sixteen percent.

Adjustment for low fuel mixture consumption

By adjusting the metering systems in operation, you can reduce fuel consumption on many carburetors. To do this, you need to combine the adjustment in the first chamber of the metering system, and then adjust the system; after idling, you need to open the secondary chamber and, under heavy loads, check the operation of the carburetor.

By combining the adjustment of the metering system with an enlarged air jet, it is possible to avoid making fuel jets with lower capacity. Sometimes you can simply make the cross-section of the air jet larger for carburetors 2105 from 1.7-1.9 millimeters, 2107 from 1.5-1.7 millimeters.

If, after the air jet has been enlarged, during smooth acceleration of the car in direct gear at a speed of sixty kilometers per hour with the opening of the primary chamber, the crankshaft rotation speed increases and there is a visible delay. If the owner is sure that the accelerator pump is working properly, then the air jet needs to have a smaller cross-section by 0.05 millimeters or 0.1 millimeters.

When starting smoothly, while driving in low gears and at minimum speed, do not pay attention to the formation of jerks and dips. It is necessary to select the adjustment of the dosing system, begin adjusting and diagnosing the XX system

The purpose of adjusting the XX system is to ensure a lean mixture composition in transition mode, at low speed. If the edge of the throttle valve is located near the vias, then the fuel mixture flows through the vias. At idle, you can make a fairly accurate adjustment using a simple tachometer

It is necessary to select the adjustment of the dosing system, begin adjusting and diagnosing the XX system. The purpose of adjusting the XX system is to ensure a lean mixture composition in transition mode, at low speed. If the edge of the throttle valve is located near the vias, then the fuel mixture flows through the vias. At idle, you can make fairly accurate adjustments using a simple tachometer.

Briefly about the technical characteristics of the injection engine

Starting in 2006, for the domestic market, the “seventh” model began to be equipped with a 1.6 liter engine with forced injection, which complied with Euro-2 standards. At the same time, the power, compared to the carburetor supply of the mixture, decreased slightly - to 50 kW. The plant guaranteed the following indicators when using AI-95 gasoline:

• urban mode - 8.5 l;
• 90 km/h – 6.9 l;
• 120 km/h – 9.2 l.

The use of a new injection system allows you to get rid of the constant adjustments inherent in the carburetor; idle speed is always stable. Dosage occurs using an electronic control unit, which is guided by sensor readings

:

• throttle position;
• crankshaft position;
• oxygen concentration;
• air consumption;
• coolant temperature.

In addition to changes in the electrical circuit of the VAZ 2107i, the following innovations were applied:

• hydraulic chain tensioner;
• hydraulic valve compensators.

These components made the engine quieter and freed the car enthusiast from such an important operation as adjusting the valves.

VAZ-2105

It is quite difficult to imagine a car enthusiast who is unfamiliar with the legendary VAZ-2105 model. Production of the latter began in the 80s. last century.

The first models were equipped with carburetor engines of different sizes and power:

• The 1.2 liter carburetor had a power of 59 hp. With;
• the 1.3 liter carburetor had a power of 69 hp. With.;
• 1.5 liter carburetor engines provided a power of 71 hp. With.

After 10 years, the manufacturer equipped the VAZ-2105 with a more powerful engine, with central fuel injection, which could reach speeds of up to 71 hp. s., its engine capacity was 1.5 liters.

The fuel consumption of a car of this brand depends on several factors:

• depending on the time of year;
• from the place of operation of the car, that is, the car is used in the city or outside its boundaries;
• on the number of traffic jams.

The average consumption in the city is 10 l/100 km, on the highway 7 l/100 km; if car owners have to stand in traffic jams for a long time while driving, especially in winter, then the consumption can increase to 15 l/100 km.

We diagnose ourselves • We diagnose ourselves

When choosing gasoline, the owner of a VAZ 2107 must remember the general rule: if you fill the car with gasoline with an octane rating lower than the calculated one, fuel consumption will increase. The rationale is that if you constantly have a roof rack on your roof, then fuel consumption increases by 10-15, the same can be said about excess cargo in the trunk.

Nuances of the VAZ-2105 carburetor adjustment process

Experts immediately warn inexperienced car enthusiasts: if you don’t know where the carburetor is located in the car and what it consists of, then you shouldn’t even start adjusting. By incorrectly changing the parameters of the fuel system, the entire vehicle can be damaged. It is best to entrust this procedure to qualified auto mechanics from a service station.

So, to begin adjusting the carburetor of a certain vehicle model, you need to study its structure. Thus, the VAZ-2105 carburetor contains several important systems:

• dosing;
• starting and warming up the engine;
• maintaining an optimal level of fuel fluid;
• starting idle;
• econostat system;
• accelerator pump.

Three of all the listed systems are subject to standard adjustment:

1. Starting and warming up the internal combustion engine (the starting device is configured).
2. Maintaining the fuel fluid level (the float mechanism is adjusted).
3. Idle speed (speed calibration is performed using a specific screw).