The reason for the high fuel consumption of the VAZ 2109

On a VAZ-2107 car, fuel consumption depends on many parameters. Of course, the condition of the engine is of great importance - the amount of compression, the level of wear of pistons, rings, valves and their seats and other components. But this is not the only thing that affects gas mileage. The fact is that the injection system is completely computerized. Of course, it is not controlled by an ultra-modern gaming computer, but only by a microprocessor. But this is quite enough to organize the correct operation of the motor. To learn about all the advantages and disadvantages of the injection system, you need to study it in more detail.

General design of the injection system

The first direct injection systems appeared several decades ago. They made it possible not only to reduce the basic fuel consumption of cars, but also to significantly simplify driving. True, the complexity of the design has increased - many sensors and actuators have appeared that are not inherent in carburetors. The introduction of such systems became possible only thanks to the development of microelectronics. Because it is based on a control unit that analyzes thousands of signals every second.

Just think about how many pulses the sensor alone produces? Hundreds per second, which is a lot. In addition, they all need to be analyzed and responded to correctly. But if carburetors operate solely on the basis of simple physical processes, such as the pressure difference in the chambers, then the injector functions only thanks to electronic devices. Pressure is created not due to vacuum in the ramp, but by pumping fuel and air into it. This will be discussed a little below, and the question of which is better – an injector or a carburetor on a car of the seventh model – will also be considered.

Less common causes of increased consumption

The reasons listed above do not end with the rather lengthy list. As you can see, there are many problems with the carburetor on the VAZ-2107. But he may not be the only one to blame. Problems with the following systems can also lead to increased fuel consumption:

• gradual reduction of the combustion chamber;
• reduced engine compression, which occurs due to severe wear of the cylinders, valves, rings and piston group, very often happens on the VAZ-2107, since over time these processes are inevitable, especially with such a middle-aged model;
• constant driving on a cold engine - may occur due to the absence or malfunction of the thermostat;
• the car is not rolling and the wheel bearings are tightened;
• spark plug failure;
• high voltage wire is broken;
• low tire pressure, which seriously increases the resistance of traffic on the road;
• the presence of a roof rack or trailer that is heavily loaded;
• impaired valve adjustment;
• delayed ignition and others.

However, experts most often recommend, first of all, paying attention to your driving style. After all, why disassemble and change anything in the car if the problem is you. If you always drive smoothly, do not brake sharply and do not accelerate as sharply, you do not have a trunk and the car is not loaded, then the problem most often lies under the hood.

Any experienced driver will always advise monitoring tire pressure, not overloading the car, and turning off the engine when the light is green. Together with a smooth ride, such methods will help save fuel consumption by up to 40% at best. Even if the effect is not so significant, over time your wallet will definitely thank you.

When it comes to any work with the carburetor, it is better not to do everything blindly, especially if you have not previously had such experience. Your wrong actions can lead to serious damage. Therefore, do not disdain the help of specialists or just watch training videos on the Internet. On the Internet you will find thousands of videos that examine this problem in detail and demonstrate ways to solve it right in front of you. If you are a complete beginner, then it is better to go to a workshop where professionals will do all the work for you.

Electronic control unit

Indeed, this is the heart of any injection machine. To understand its operation, it is necessary to consider the block diagram, which includes:

1. Reading devices (sensors).
2. Actuators (IAC, fuel pump, catalytic collector heater).
3. Microcontroller with the required number of I/O ports.

But the whole problem is that the sensors produce different signals. Some have 12 volts output, while others have less than one. And the problem is that on a VAZ 2107 injector, fuel consumption will depend on the parameters coming from the sensors, and the microcontroller can only perceive a signal in the range of 3.5-5 Volts.

How to reduce fuel consumption on a VAZ 2107

RT on VAZ cars with a carburetor engine depends on many factors:

• driving style - during fast dynamic driving, gasoline literally “flies down the drain”;
• season - in winter a lot of fuel is spent on warming up the internal combustion engine;
• the serviceability of the power unit - if the engine is running rough, the fuel does not burn completely, consumption increases;
• tire pressure - with poorly inflated wheels, the resistance to movement increases, and accordingly, the RT increases;
• settings, serviceability of the carburetor itself.

To save money on refueling a car, motorists are advised to install gas-cylinder equipment - gas is consumed no less, but the fuel itself costs at least almost half as much, refueling with methane is especially cheap.

It should be noted that converting a car to gas is beneficial only if the car is used regularly and covers at least 30-40 thousand kilometers per year. The thing is that before you can profit from saving on fuel, you first need to recoup the cost of installing the equipment and the gas equipment itself.

Coordination of the microcontroller with sensors

Therefore, some signals need to be amplified and others reduced. For these purposes, intermediate stages (matching devices) are used - operational amplifiers and voltage dividers. This is all clear, but the microprocessor will not be able to turn on even the winding of the electromagnetic relay. For this purpose, special Darlington assemblies are used. This is a small microcircuit; it is based on amplifier stages based on field-effect transistors. They operate in key mode and allow switching currents up to 30 A. This is quite enough to power the winding of an electromagnetic injector.

It is impossible to coordinate the microcontroller with the injectors using an electromagnetic relay. The reason for this is the high pulse frequency. The relay simply will not be able to manage the required number of switchings per second. From this point of view, the switch on the field-effect transistor turns out to be much more efficient.

Electromagnetic injectors

Below is a table of fuel consumption for a 1.5-liter engine, but with a different injection system.
Constant pressure is maintained in the ramp, gasoline is in suspension, almost a kind of fog. It is separated from the combustion chamber only by the solenoid injector valve. What kind of device is this? It consists of a coil, a core and a valve, which is driven by current. Carburetors also have something similar, the design is very similar - this is an idle speed solenoid valve. The functions and appearance are of course different. Injectors have two states - open and closed. In the first, gasoline and air are injected into the combustion chamber. Comparison of fuel consumption of a carburetor and injection engine with a volume of 1.5 liters

VAZ 2107 injector

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.

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.

Reasons for overspending

To determine the causes, technicians use a special device - a tester. They check the electronic control unit and sensors. There are several main reasons when fuel consumption may increase:

• Aggressive driving.
• Precipitation on the walls of nozzles, measurement of their flow area.
• Incorrect operation of the sensors.
• The glow number of the spark plugs does not correspond to that stated by the manufacturer.
• The car's air engine is clogged.

We diagnose ourselves

You can find out for yourself how much fuel is actually consumed. To do this, you need to fill a full tank of gasoline, which is 39 liters, and drive until the gas level indicator is in the middle. This will take more than one hour of moderate driving. Then we go back to the gas station.

We calculate: divide the volume of fuel poured by the mileage on the odometer. This way you will find out the average gasoline consumption of a VAZ 2107 per 100 km. If fuel consumption standards are exceeded, you yourself will not be able to diagnose the exact cause of the problem. Then it is recommended to go to a service station.

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.

Engine versions

Model VAZ 2103

The first engine that was installed on the “seven” was 2103, 75 hp, 1.5 liters. The results showed that in this carburetor car the speed does not exceed 155 km per hour. At the same time, fuel consumption within the city is 11.5 liters.

Model VAZ 2104

New engine – 2104, 72 hp, 1.5 l – injection. The manufacturer claims that a car with this engine can reach a maximum speed of 150 km per hour. But the fuel consumption of the VAZ 2107 decreased to 8.5 liters. \

Model VAZ 2106

Engine 2106, 74 hp, 1.6 l - the most popular among other injection versions. The maximum speed reaches 155 km/h. When driving on the highway, the fuel indicator dropped to 7 liters. Over the 7 years of sales of this engine, the figure was equal to the sales of carburetor versions over 23 years.

In these examples we can see that the fuel consumption of the 2107 injector is lower than that of the carburetor.

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Electric fuel pump

But this is a device that is responsible for ensuring that the required pressure is always present in the ramp. How to reduce fuel consumption will be discussed below. But it is worth noting that the electric pump does not affect this parameter. It is located directly in the tank, combined in a single housing with a gasoline level sensor. It also has a filter. People call it “diaper” due to its external resemblance.

By the way, try to change it as often as possible, otherwise the fuel lines and injectors will become clogged. And cleaning sometimes costs a lot of money. In addition to the electric pump, there is another device that allows you to maintain constant pressure - the regulator on the ramp. With its help, excess gasoline is discharged back into the tank. Therefore, excess pressure for the system is not dangerous.

Why is an injector better or worse than a carburetor?

Convenience is the main trump card of the injection system. In addition, its minimum fuel consumption is much lower than that of a carburetor. The reason for this is a more advanced system, control of all engine operating parameters. There are also advantages - there is no suction. The air supply is handled by an electronic system. At high speeds, the engine response is higher.

But at low speeds, unfortunately, the torque and power are lower. A very complex design entails expensive maintenance. Without diagnostics, it is sometimes difficult to determine the cause of a car breakdown. Even all this data is enough to try to answer the question of which is better - an injector or a carburetor. But there will still be no final answer. On the one hand, the injector is better. On the other hand, it turns out to be somewhat worse.

Engine versions

Model VAZ 2103

The first engine that was installed on the “seven” was 2103, 75 hp, 1.5 liters. The results showed that in this carburetor car the speed does not exceed 155 km per hour. At the same time, fuel consumption within the city is 11.5 liters.

Model VAZ 2104

New engine – 2104, 72 hp, 1.5 l – injection. The manufacturer claims that a car with this engine can reach a maximum speed of 150 km per hour. But the fuel consumption of the VAZ 2107 decreased to 8.5 liters.

Model VAZ 2106

Engine 2106, 74 hp, 1.6 l - the most popular among other injection versions. The maximum speed reaches 155 km/h. When driving on the highway, the fuel indicator dropped to 7 liters

. Over the 7 years of sales of this engine, the figure was equal to the sales of carburetor versions over 23 years.

In these examples we can see that the fuel consumption of the 2107 injector is lower than that of the carburetor.

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We will tell you about the most common ones. Only a professional who has conducted a thorough inspection of the car can tell you exactly what the problem is.

Is it possible to reduce injector consumption?

Now it’s worth talking about how to reduce fuel consumption on an injection engine. The surest way is to change the microcontroller firmware. At the same time, a new fuel map is recorded according to which the engine operates. The content of air and gasoline changes, therefore, there is a loss of power. But you get a slight advantage. As a result of such manipulations on the VAZ 2107 injector, fuel consumption decreases. True, the maximum speed, power and throttle response of the car also become less. When choosing firmware, car owners are guided by the average indicators shown in the table. For comparison, data is presented for a similar engine with a carburetor injection system.

conclusions

The increase in fuel consumption of the VAZ 2107 depends both on the driver’s behavior and the vehicle’s operating mode, as well as on the condition of the car. Therefore, it is necessary to pay attention to as many factors as possible that affect gasoline consumption and then you will undoubtedly achieve a reduction in fuel consumption. Successful savings and good luck on the roads!

The fuel consumption of the VAZ 2107 per 100 km depends on many factors. These include the following: vehicle speed, engine type and fuel supply system. What is the fuel consumption of a VAZ 2107 with a carburetor? According to documents for this model of car, the average fuel consumption on the highway is 6.8 liters, if the speed is about 90 km/h. When driving in city mode, this figure increases significantly - up to 9.6 liters.