VAZ 2115 High Fuel Consumption Injector Reason • Power system

16.11.2012

Gasoline flow sensor

My VAZ 2114 (1.5) 2005 with a mileage of 104 thousand uses about 12 liters per hundred in the city, but it’s still November, so what can we expect in winter? But my father’s 14th with a 1.6 engine consumes a stable 8.1 liters per 100 km in the city. And I asked myself: “Why is the fuel consumption so high on my 2114?” And I went looking for an answer on the Internet, as a result of which this article was created

According to the passport, Samara-2 should consume 7.6 liters per 100 km in mixed mode, in the city - no more than 9 liters. If your readings are as high as mine, then it's time to address the increased fuel consumption.

The reason for the high consumption of gasoline, both in VAZ and in other cars, may be the engine management system: it includes an Electronic Control Unit ( ECU , popularly known as the “brains”) and various sensors and drive mechanisms.

Checking the entire engine management system is quite difficult, and it is better to entrust this work to professionals, but if you want to solve the problem yourself, then go for it. Check the mass air flow sensor: Read the article How to check the mass air flow sensor on a VAZ?

The cause of increased fuel consumption can also be a faulty fuel system, namely the fuel pressure in the fuel system (How to check the pressure in the fuel system?):

1. Clean/replace the fuel injectors (Cleaning fuel injectors. 4 ways/ How to remove injectors?).
2. Replace the fuel pump.
3. Replace the fuel filter (Replacing the VAZ fuel filter).
4. Defective.
5. The phase sensor (PF) is faulty.
6. The oxygen sensor (Lambda probe) dies.
7. A clogged air filter will increase your fuel consumption by about 3 liters. So it’s better to replace it once again; it costs about 120 rubles. How to replace the air filter?

It also doesn’t hurt to check the following elements:

• Candles - they should not be sooted. Read the article: How to replace spark plugs? Step-by-step instruction.
• High-voltage wires: read the article How to check high-voltage (HV) wires?.

Increased gasoline consumption may be due to low compression in the engine (How to measure engine compression correctly?). Consumption is also affected by an incorrectly set ignition angle and incorrect valve timing.

At worst, check the tire pressure, they also affect fuel consumption. (What pressure should be in the tires of a car?)

VAZ 2115 – fuel consumption data

In 1997, the extremely successful line of Lada Samara models was replenished with a new series, codenamed Samara 2. One of the first models of the updated family was the VAZ 2115, which attracted potential buyers with reduced fuel consumption per 100 km, improved appearance, and a more comfortable interior than its predecessors. without unnecessary glamor. The car turned out to be so popular that it was produced until 2012, enjoying stable demand. Among its advantages are noted:

1. Updated design that compares favorably with previous models.
2. Improved optics.
3. Expanded range of gasoline engines.
4. High reliability and maintainability.
5. Installation of a modern fuel supply system.
6. Reliable suspension, adapted to domestic roads.

Advantages of the machine

For more than ten years, developers of modern cars have been resorting to a new type of fuel supply. Outdated carburetors have been replaced by injectors that increase engine efficiency. At the same time, they significantly reduce the flow of fuel into the tank, which significantly saves fuel consumption.

VAZ has such capabilities, which positions itself as a reliable, economical sedan modification vehicle. The fuel consumption of the VAZ 15 per 100 km is significantly less than that of other cars of a similar pricing policy.

INCREASED CONSUMPTION, WHAT TO DO – Power system

• Vladimir, Novocherkassk. I have a VAZ 2115 produced in 2007 with an eight-valve 1.5 MT. The main advantage of this car is its amazing reliability. The dynamics, of course, are mediocre, but in mixed mode, even in winter, fuel consumption does not exceed 9 liters per hundred, which completely suits me.
• Nikolay, Tver. Lada 2115 with a 1.5 engine with 78 horsepower is an excellent budget car. Compared to other cars, repairs cost a penny, it handles excellently, and in the city it confidently stays in traffic. Comfort is not enough, but I'm ready for it. To reduce heating in winter, I bought a car blanket, now the car takes 8.5-9 liters per 100 kilometers.
• Ivan, Petersburg. VAZ Lada 2115 with injection 1.5 MT, drove 200 thousand km. The car drives briskly, both in the city and on the highway. The interior is spartan, but enough for me. Fuel consumption on the highway is 6 liters, in the city it reaches 10.

1.5 engine with an injector • But if your VAZ 2114 has high fuel consumption, then this is a reason to carry out diagnostics and most likely repair the systems of your car.

Next, we will find out which sensors affect fuel consumption.

The lambda probe assesses the state of the exhaust (the presence of oxygen in the exhaust gases). That is, based on the volume of oxygen in the exhaust, it provides adjustment of the working mixture. It is installed in the exhaust system, it should be noted that it is the only one located on the “pipe” so you can’t go wrong. An oxygen sensor error can be seen either using the on-board computer or when undergoing diagnostics at a service station. Here are some reasons for his “death”:

• Poor quality gasoline;
• Stiff valves;
• Incorrect mixture;
• Oil scraper rings allow oil to flow into the mixture;
• The advance angle is incorrectly set.

Specifications

This is an improved model of the well-known VAZ 21099. The sedan that replaced it has become more popular than its predecessor. It features a number of positive innovations, which include a more modern assembly, economy, and the necessary comfort for the driver.

In Samara, the front optics have been modernized, the design has become streamlined and modern, and the stylish updated trunk lid attracts the attention of many consumers. The modified sedan can be equipped with electric windows, fog lights or heated seats. The on-board computer has become a classic feature for this car.

Fuel consumption standards 2022 Ministry of Transport: With 16 80 l engine with petrol manual transmission

• The fuel consumption rate for a VAZ 2115 (injector) on the highway will be 6 liters.
• In the city, the consumption indicator will indicate 10.4 liters.
• In areas with mixed roads – 7.6 liters.

Reviews from VAZ Lada 2115 owners Power supply system

Considering that today the cost of gasoline is quite high, it is easy to guess that increased consumption can make a noticeable hole in the family budget of an ordinary person, when every trip becomes literally golden. Irregularities in the power supply and ignition systems most often cause a drop in power, so testing to identify the cause should begin with them.

General table for all cars until 2008: : With 16 80 l engine with petrol manual transmission

Of course, no one forbids you to at least try to fix the problem yourself, and you should start by checking the functionality of the mass air flow sensor. Fast and passable, there have been no serious problems the entire time, at speeds above 120 km/h the consumption is about 8 liters, but in economy mode you can keep within 5 liters.

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• In summer, on the highway you will need 6.5 liters with a mileage of 100 km.
• The fuel consumption of the car in the urban cycle is 9.9 liters.
• With a mixed route, fuel consumption will correspond to 8.3 liters.
• In off-road conditions, VAZ 2115 gasoline consumption per 100 km increases to 10.8 liters.

1.5 engine with injector • To reduce warming up in winter, I bought a car blanket, now the car takes 8.5-9 liters per 100 kilometers.

What to do Sensor failure

• Arthur, Ufa. VAZ-2115 manufactured in 2012, the car is from the last batch. We bought it for testing at our editorial office. Everyone already knows about the car, the machine has been thoroughly studied. However, tag is a whole era, and we had to carry it out properly. For this purpose, they organized a resource test. The four-door car drove 100 thousand km and showed itself to be a great guy. Approximate fuel consumption is 9-11 liters with a 1.5 power unit. The checkpoint is still alive today and functions perfectly. As a result, a solid car for the chosen means, but still requires timely repairs.
• Julia, MSK. A car for any purpose, exemplary for both city roads and non-urban routes. At the same time, my fifteenth has high ground clearance, which makes it easy to use off-road. Brisk 1.5 l. The power unit consumes 11 l/100/100 km.
• Roman, Murmansk. I liked the car. In my opinion, it is much more profitable than Asian cars from the early years of production. In any case, our brand seems to behave more honestly and predictably. In addition, the service center has all consumables and parts. Fuel consumption 11 l/100.
• David, Astrakhan. My VAZ-2115 was purchased by my father, then it was inherited, so to speak. The car was manufactured in 2003, with a number on the odometer of 193 thousand km. Still running, still not complaining. Consumption 10-12 l.
• Renat, Mariupol. A worthy car of its time, a pure era for our AvtoVAZ. It's right that it was discontinued. Better late than not at all. And I gave mine away exactly in 2012, if it was removed. The car of my youth ate no more than 11 liters of the most budget AI-92.
• Evgeniy, MSK. A strong car, ordinary and easy to own. Very cheap in service, the layout of the car couldn’t be simpler. It's quite comfortable inside, if you don't pick too much. All controls are at hand. The 1.5-liter power unit is quite practical in city mode, consuming approximately 10 liters per hundred kilometers. 78 horsepower allows you to reach the first hundred in 15 seconds, and I feel this is acceptable for such money.
• Arkady, Nizhnekamsk. In the end I am satisfied with the car, this is my first car. I bought it in 2013; it was being discontinued at that time. It's called successful. Equipped with a 1.5-liter gasoline engine, front-wheel drive and manual transmission. Everything is the old fashioned way. Everything functions properly, I check the car periodically. Fuel consumption 11 l/100.
• Alexander, Tambov. A great car for a beginner, a very easy to learn car. Eats no less than 11 liters of gasoline. 1.5 liter 75l. With. The engine runs like 100hp. s.. Maybe it seems so due to vibrations and aerodynamic noise, but the engine is in fact quite playful for such a displacement.
• Renat, Lugansk. A normal car for the chosen means. I have a used one that has 100,000 miles on it, but so far everything is functioning properly. Fuel consumption with a 1.5 power unit is 11 l/100/100 km.
• Polina, Svetlogorsk. The car was manufactured in 2008. I praise the tag for its lively and dynamic power unit, which behaves like a fighter at all engine speeds. VAZ people know how to make engines. Consumption 10-11 l.

How to reduce fuel consumption on a VAZ 2115 • Reduce fuel consumption on a VAZ 2115 gasoline.

FACTORY SPECIFICATIONS

In any case, the fuel consumption of the VAZ 2114 per 100 km depends on the operating conditions of the vehicle. This indicator also affects the characteristics of the engine. It must be taken into account that the VAZ model was equipped with 4-cylinder engines:

• Volume 1.5 liters, 8 valves;
• Volume 1.6 liters, 8 valves;
• Volume 1.6 liters, 16 valves.

Table of gasoline consumption per 100 km. (according to data from the car manufacturer VAZ)

Therefore, the fuel consumption of a VAZ should differ slightly according to factory conditions in different modes, depending on the displacement of the engine and the number of valves in the cylinder head.

WHAT TO DO

Lada 2115 had several engine configurations. The smallest and most powerful version was the one with a volume of 1.3 liters. Thanks to various modifications, they were able to squeeze out as much as 135 horsepower. However, such an engine has high fuel consumption, which is stated in the passport at 10 liters. Other engines are much more modest. So, the 1.5 liter engine is capable of producing only 78 hp. power if the fuel is supplied by an injector, and 68 if the carburetor. Here, fuel consumption per 100 km varies from 7.1 to 7.7 liters. Another engine had a volume of 1.6 liters. Its power was 80 hp, and it consumed up to 7.6 liters of gasoline. All engines were paired with a five-speed manual transmission, standard for our cars.

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• Idle speed sensor. Operating principle, signs of malfunction.
• Throttle position sensor (TPS) VAZ.

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.

The engine does not pull: the main reasons for the decrease in engine power

So, if no other symptoms other than loss of traction are detected, then you immediately need to pay attention to the quality of the fuel, the proper functioning of the ignition and power systems.

• As practice shows, more than half of the cases of reduced efficiency from internal combustion engines are associated with fuel. The engine does not turn on due to the fact that the tank may be filled with low-quality or unsuitable fuel for this type of engine (for example, 92-grade gasoline instead of 95-grade gasoline).

Typically, such manipulations are necessary when, parallel to the loss of traction, unstable operation of the internal combustion engine is noted, the speed jumps or floats at idle and under load, the engine does not start easily, the “check” light is on the panel, etc.

Also, owners of gasoline engines can independently determine the quality of gasoline by the spark plugs and their appearance. To check the spark plugs you need to unscrew them from the engine. A disruption in the combustion process of the fuel-air mixture in the cylinders, as well as the presence of impurities in the fuel, can be identified by soot on the spark plugs and its color.

For example, if the fuel contains a lot of third-party metal-containing additives and additives, then the skirt and electrodes may become covered with reddish soot (brick-colored). Black soot will indicate that the fuel is not burning properly, etc. In any case, malfunctions in the combustion process of the working mixture lead to the fact that the engine stops pulling.

• The next step in diagnosis is checking the spark plugs. A decrease in the efficiency of these elements is also accompanied by a decrease in the power of the power unit.

This is especially noticeable during sharp accelerations, and when the car is already moving at high speed. In other words, the motor has no “reserve” left for further acceleration.

Carburetor - why fuel consumption has increased

As a rule, it is in cars with carburetor engines that the problem of increased “appetite” is more acute than ever. Let's look at what can cause high gasoline consumption:

1. The air damper is not fully open. It is no secret that the normal position of the damper when the engine is warm is vertical. In turn, the position of the choke handle is “towards you”.

If the choke is pulled out completely, but the damper has not yet reached a vertical position, then the problem is obvious. The air-fuel mixture enters the combustion chamber too rich. As a result, consumption also increases.

2. The EM valve or the XX fuel jet is not fully tightened. In this case, the prepared fuel is sent to the XX system, bypassing the fuel nozzle.

As a result, an increased volume of fuel enters the combustion chamber in any of the cycles. The harder you press the gas pedal, the higher the consumption at idle and while driving.

3. Violation of the tightness of the needle valve (the one located in the float chamber of the carburetor). When such a malfunction occurs, technicians often say that the carburetor seems to be “overflowing” fuel.

Excess portions of gasoline first enter the float chamber, and then into the cylinders.

4. The jets of the XX system or metering system are too large in diameter. In this case, a too rich mixture enters the combustion chamber.

5. The jets of the above systems are dirty. This malfunction clearly leads to excessive consumption and can be solved by cleaning the carburetor.

6. The EPH system has failed. Additional signs of this problem are unstable engine operation.

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• Violations of the thermal clearance of valves;
• Heavy carbon deposits on the valve plates and seats, or their burning;
• Occurrence of rings;
• Limit wear of the CPG;
• Cylinder head gasket failure.

High fuel consumption of VAZ 2108, 2109, 21099, 2105, 2107 cars

Let's consider the reasons for the high fuel consumption on VAZ 2108, 21081, 21083, 2109, 21093, 21099, 2105, 2107 cars and similar ones with carburetors 2108, 21081, 21083 Solex 2105, 2107 Ozone. In this article we list those that are directly related to one or another carburetor malfunction.

Other reasons not related to it are set out in the article “Causes of increased fuel consumption not related to the carburetor.” Indirect signs accompanying high fuel consumption are black carbon deposits on the spark plugs, pops or shots in the muffler, increased engine idle speed, black exhaust from the muffler, or exhaust with a persistent smell of gasoline, etc.

The page “Fuel consumption of VAZ cars with carburetor engines” provides examples of fuel consumption for various models of VAZ cars. Compare whether your consumption fits into the given standards. Perhaps the seemingly high fuel consumption actually falls within the standards set by the factory. If it doesn’t fit, then here is a list of possible reasons for this behavior of your car.

Fuel consumption at idle speed

And this is also a fairly significant indicator when determining average fuel consumption.

The passport idling flow rate should not exceed 0.8 liters per hour.

Since our engine is not a carburetor and you can’t adjust anything with a screwdriver, the only thing to blame for the high consumption is the idle speed sensor.

The idle speed sensor affects average fuel consumption

Unfortunately, this sensor cannot be diagnosed in any way, so its failure can only be judged by its symptoms:

• no high revs during cold starts;
• unstable, floating idle speed;
• refusal to idle in principle;
• The engine stalls while coasting or while shifting gears.

Actually, there is only one treatment option - replacing the sensor . However, there is another sensor that is diagnosed by the system - the throttle position sensor. It is located in the throttle assembly and the symptoms of its malfunction are similar to the idle speed sensor. The only difference is that its malfunction will be detected by the self-diagnosis system.