Reducing fuel consumption on an 8-valve VAZ-2114: press the trigger correctly

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?)

Fuel consumption certificate

It is worth considering that there is a passport and actual fuel consumption of the VAZ Lada 2114. Quite often these two parameters do not coincide. If you believe the manufacturer, then this car with a 1.5-liter power plant in the combined cycle should consume 6.8 liters of gasoline per 100 kilometers. At the same time, consumption on the highway is 5.2 liters, in the city – 8.9 liters.

Fuel consumption per 100 km (VAZ-2114 with a 1.6-liter engine) will be 7.2/5.4/9.8 liters in mixed mode, on the highway and in the city, respectively. As you can see, the numbers are very attractive, which indicates the efficiency of the car.

However, if you believe the reviews, then on the VAZ-2114 the fuel consumption per 100 km significantly exceeds that declared by the manufacturer. With a 1.5-liter engine, the maximum gasoline consumption when driving in urban conditions is 12 liters. With a 1.6-liter engine, consumption reaches 13.5 liters per 100 kilometers. As for driving on the highway, here the parameter practically corresponds to the declared one - 5.5-6 liters per 100 kilometers. In mixed mode, the car consumes about 7.5-8 liters per hundred.

Some owners have significantly higher fuel consumption, but often there are some malfunctions with the engine or some element of the fuel system.

Simple reasons that you can eliminate yourself

Sometimes you can solve the problem of the huge fuel consumption of the VAZ-2114 yourself. First of all, you need to check the degree of contamination of the fuel filter and check it for debris. If there is debris inside it or suspicion of contamination, then it is better to replace it. This element is inexpensive, and its average price is 300 rubles. You can replace it yourself - it’s simple and does not require the intervention of a specialist.

The second filter is the air filter. Air passes through it, which is subsequently mixed with gasoline and supplied to the combustion chamber. And if it is dirty, it will not be able to pass enough air. As a result, the air-fuel mixture will not be enriched with oxygen, and a lean fuel mixture will quite logically lead to increased gasoline consumption. Car owners often manage to reduce gasoline consumption by approximately 3 liters per 100 kilometers simply by replacing the air filter. It is easy to change - it is located in a large black box under the hood.

Clogged air filter

A negligent attitude towards the condition of the machine leads to the accumulation of a number of faults. The cost of an air filter for a VAZ is no more than 200 rubles. However, this does not stop some drivers from wanting to save money. A clogged air filter is a direct path to damage to the mass air flow sensor and loss of power. Obstructed air supply to the combustion chamber of the mixture increases fuel consumption.

In winter, this element does not play a big role, but when driving in dusty conditions, its condition should be checked regularly. The best way to eliminate a problem with this element is to carry out maintenance on time.

Lambda probe

One of the first and most important sensors, the operation of which can affect increased gasoline consumption, is the lambda probe. It is located on the exhaust pipe, and its main task is to assess the condition of the exhaust gases. Based on the oxygen content in the exhaust, the system regulates the volume of the working mixture. Accordingly, if the sensor malfunctions, the system will not be able to accurately regulate the working mixture that needs to be supplied to the combustion chambers. This may increase consumption.

However, if the sensor breaks down, the system warns the driver about this with a “Check” light on the dashboard. You can also see the error using the on-board computer. Often this sensor breaks down due to poor quality gasoline, oil getting into the combustion chamber, or valve clamping.

Low compression in the engine

Gradual wear of the piston group and the engine as a whole is inevitable even with constant maintenance. Insufficient compression in the cylinders is a sign of wear. In such a situation, the engine stops producing maximum power, which increases fuel costs. In addition, oil consumption in the engine appears. Repairing the piston group is a logical option to solve the problem. To begin with, you can decarbonize the rings and fill in the additive. This will have a small effect, but will still reduce the level of gasoline consumed.

In the photo, the engine compression indicator is 13 points, which is a good indicator.

Speed ​​sensor

Also, the cause of high fuel consumption per 100 km (VAZ-2114) may be the speed sensor. Its main task is to transmit information about the speed of the vehicle to the control unit. The latter monitors the operation of the engine by adjusting the throttle valve. The problem with this sensor will be shown by the on-board computer or error reading device. It is almost impossible to replace it yourself without specialized knowledge. Typical symptoms of speed sensor failure:

1. Speedometer failure or interruptions.
2. “Floating” idle speed.
3. Noticeable loss of traction.
4. Stopping the engine when idling.
5. Increased gasoline consumption.

The principle of operation of the fuel system

High fuel consumption on the VAZ 2114, then follow the instructions below. Of course, few people would want to drive such an “expensive” car and throw money away.

There are not many options:

go to an official service center and let them fix the shortcomings, or do it yourself, if you know a lot about it. Only in the latter case you need to be especially careful, since you can violate the warranty period, if it still exists.

So, if you decide to fix everything yourself, then first you need to outline the range of sources of problems: electronic control unit (ECU), sensors, filters.

Drive the car into an inspection pit or overpass, let the engine cool, put on rubber gloves and begin visual diagnostics.

note

to the fuel system, namely:

• Unscrew the nozzles one by one. Examine them. If you have a tester, clean it with injector fluid. Possible deposits or other foreign particles;
• Fuel pump: if there are no leaks or mechanical cracks, then the cause may be internal. You should disassemble it and clean the internal diaphragm ( see the article
  “Signs of a fuel pump malfunction”);
• Remove and replace the gasoline filter with a new one; if there is no obvious sediment in the old one, this does not mean that it is clean. Microparticles are not visible to the human eye;
• Malfunctions in the speed sensor. At first glance, it has nothing to do with it; it may be a source of increased gasoline consumption;
• Instability in the operation of the phase sensor, which records the position of the crankshaft at certain moments of rotation;
• The oxygen sensor
  allows less air to pass through. The fuel system begins to starve, the mixture becomes leaner and the engine requires more ignition costs. In this case, only complete replacement, no resuscitation;
• In addition to the fuel system, we will check other components. Each part must be checked separately, so that you do not spend money on purchasing the entire set, but it turns out that the filter, for example, is to blame.
• The air filter is the second source after the fuel system. It can squeeze out a maximum of 3.0 liters/100 km. mileage

Increased consumption in idle mode

Typically, normal gasoline consumption when the engine is idling is 0.8-1 liter per hour. If these indicators are not exceeded, it means that everything is fine with the system. If consumption is increased, then it is worth checking the same sensors. However, special attention should be paid to the idle speed sensor, which automatically regulates idle speed. It is located on the throttle assembly and is secured with a pair of screws. The device does not have an electronic system, so its breakdown will not be displayed on the dashboard in the form of a “check”. You can judge its malfunction only by certain signs:

1. Lack of high speed when starting a cold engine.
2. The engine stalls when idling. This may even occur during gear changes.
3. “Floating” idle speed.

How to reduce gasoline consumption on a VAZ-2114 car?

The steps are simple: you need to use high-quality gasoline, replace consumables on time (fuel and air filters, oil, oil filter), monitor the condition of the sensors, and if you suspect a malfunction, you need to contact a specialist.

Now you know what fuel consumption per 100 km the VAZ2114 has, and what elements can affect increased gasoline consumption.

High fuel consumption of the VAZ 2114 today is one of the most common problems faced by owners of domestic cars. The fuel consumption rate of the machine can be found in the technical documentation.

For the injection “fourteenth” engine, the consumption rate is within 8.5 liters per 100 km in the urban cycle and about 6.5-7 liters on the highway. But more often, VAZ 2114 owners record completely different indicators that go far beyond its limits. What is the most common problem and are there effective ways to fix it? Sometimes we are faced with the acute question of how to reduce fuel consumption on a VAZ 2114 8-valve injector?

SIGNS

Consumption of fuel above the norm is a phenomenon that occurs quite often. Therefore, many car owners are often interested in how to reduce fuel consumption on a VAZ 2114. If the driving style does not raise any doubts in terms of accuracy, and it’s summer and the roads are smooth, then you need to pay attention to the technical condition of the car to see if this is the reason. High fuel consumption may be accompanied by the following symptoms:

• There is black exhaust coming from the muffler pipe. It is most noticeable when you sharply press the gas pedal;
• The engine runs unsteadily (troits), does not develop speed, the car drives jerkily;
• The motor runs smoothly, but is “dull” and lacks power;
• Popping sounds in the muffler or intake manifold;
• The Check Engine diagnostic light is on inside the car.

Check Engine light is on.

What is the real gasoline consumption of VA3 2114?

Today it is a real rarity when a car fully complies with the specifications of the technical documentation. Most often, the manufacturer indicates data obtained during testing of the car under ideal conditions. The actual fuel consumption of almost all modern cars is 1-2 liters higher than the norm. You should not neglect important factors that contribute to increasing the “appetite” of the machine.

These factors are:

1. Vehicle operating conditions.
2. Driving manner and style.
3. The presence of various types of malfunctions.
4. Fuel quality.

High fuel consumption VAZ 2114 injector 8 valves, how much is this in numbers? Most owners of the 8-valve “fourteenth” note consumption in the range of 8.5 – 9 liters in the urban cycle and 7-7.5 liters per 100 km on the highway. This is an average figure that is close to the fuel consumption rate specified by the manufacturer.

The main signs and reasons for the increase in fuel consumption of the VAZ 2114

If it’s summer and you drive on normal roads, but at the same time you notice an abnormal “appetite” of the fuel-injected 8-valve VAZ 2114, then it’s time to conduct a full diagnosis of the car’s condition. Excessive fuel consumption is easy to notice not only by the frequency of visits to gas stations. Often, owners note some oddities in the operation of the engine. Unstable operation of the “heart” of the car is accompanied by black smoke from the exhaust pipe and the presence of popping noises in the muffler or intake manifold.

Black smoke from the exhaust pipe most often occurs due to the formation of an overly rich fuel mixture. This disease occurs due to clogged injectors, faults in the ECU, and low-quality spark plugs.

Gasoline consumption can increase, both for a simple and harmless reason, and in the event of serious malfunctions in the car system. For example, a clogged fuel filter increases the fuel consumption of the “fourteenth” by as much as 2-3 liters. Low tire pressure and non-standard wheel radius also contribute. It has long been a known fact that the larger the radius of the wheel, the more effort must be made to turn it.

Ignition module

The appearance of microcracks in the ignition module housing is a common occurrence. Poor quality plastic, which shrinks under the influence of temperatures, leads to the appearance of cracks. Insufficient spark power reaching the wires, and then to the spark plugs, leads to the problem of improper ignition of the mixture. In case of such a malfunction, the check also lights up.

You should not try to glue microcracks, because... they will appear again when exposed to temperature. Replace the ignition module and reset the errors. If there are breakdowns, check the condition of the wiring to the module and the condition of the chip.

A malfunction of the module not only causes high gas consumption, but also leads to “tweaking” of the engine, which can lead to rapid wear. Malfunctions in the spark supply system conceal a lot of problems: decreased dynamics, the appearance of lumbago, contamination of the combustion chamber of the mixture due to the lack of a spark, etc.

Ways to reduce fuel consumption of a VAZ 2114 with an injector

What to do if the VAZ 2114 has high fuel consumption and the reasons are unknown? Of course, it is best to go to a service station and undergo a full computer diagnostic. The fact is that the VAZ 2114 injection system with 8 valves contains a large number of different sensors. A failure in the operation of one of them can lead to the fact that the owner of the car will rack his brains for a long time in search of faults, but will never find them without special software.

One of the most effective ways to reduce gasoline consumption by a car and its subsequent control is timely prevention of vehicle components and components and scheduled maintenance.

Not every faulty sensor affects the “appetite” of the car. The lambda probe plays the greatest role in the excessive consumption of the fuel-air mixture. This device regulates the formation of a combustible mixture based on the volume of oxygen in the exhaust. The presence of errors in the operation of the lambda probe can be determined by the on-board computer. This device most often fails due to poor fuel quality and an incorrectly set advance angle.

The car owner can independently eliminate or partially reduce the high fuel consumption of a VAZ 2114 injector with an 8-valve engine through the following measures:

1. Regularly replace the air and fuel filter. In this case, preference should be given to factory elements.
2. Monitor the condition of the spark plugs and replace them according to the recommendations.
3. Periodically measure the tire pressure level and monitor the condition of the brake system parts.
4. Refuel your car only at time-tested gas stations.
5. Maintain cleanliness of components and assemblies of the engine compartment.

Useful video

You can learn more about the possibilities of reducing fuel consumption by watching the video below:

Maintaining the proper condition of the car in the future will save the owner from hassle and unexpected expenses. You just need to promptly replace clogged filters and damaged spark plugs, and then increased fuel consumption will bypass your car.

How to reduce fuel consumption on a VAZ 2114 is a question many car enthusiasts ask. What the gasoline consumption of a VAZ 2114 should be is usually indicated in the factory documentation. It ranges from eight to nine liters per hundred kilometers. This spread depends on the driving style and its mode (city, highway, mixed). If the indicators of your iron “favorite” fit into these frameworks, then most likely no intervention will reduce them. But if your VAZ 2114 has high fuel consumption, then this is already a reason to carry out diagnostics and most likely repair the systems of your car.

If you yourself do not have sufficient knowledge or skills, then it is better for you to contact specialized workshops where they will accurately answer the question: why the fuel consumption on the VAZ 2114 has increased.

Here we will talk about possible causes and methods for eliminating them.

Reasons for high fuel consumption on the VAZ 2114

Air leak

A more serious and difficult to diagnose cause of increased consumption is air leaks. Damage to the corrugation to the mass air flow sensor housing, loosening of the fastenings of the pipes on the engine, damage to the manifold gasket - these are just a few sources of air leaks. There are many options for diagnosing and finding the exact location of the air leak. You can often determine the problem area by ear. In extreme cases, you can resort to using a smoke generator.

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.

Increased consumption in idle mode

Does the VAZ 2114 have higher fuel consumption at idle? Sensors monitor everything here too! Normal consumption, with the electrical load completely turned off, is 0.8-1 liter per hour. If this indicator is greatly exceeded on your car, then we check the sensors described below.

Idle speed sensor (ISR). Its purpose is to automatically adjust idle speed. It is located on the throttle assembly, or rather secured with a pair of screws on its cover. This sensor does not have an electronic diagnostic system and therefore its condition can only be judged by these signs:

• When starting a cold engine, high speeds are not observed;
• The engine stalls at idle;
• Idle speed “floats”;
• When you turn off the speed while driving, the gearbox stalls.

Idle speed regulator VAZ 2114

TPDZ. A device for precise dosing of the mixture or, more simply, a throttle valve location sensor. By its name you understand that its function is to “show” to the controller what position the throttle valve is currently in. It is part of the throttle assembly and is attached to its body. The malfunctions of this device are very similar to the symptoms of DXX, but it is connected to an electronic diagnostic system and if it breaks down, the “check” light will notify you about it.

In addition to all the above reasons, there are some more: insufficient compression in the engine, incorrectly set ignition timing, the gas distribution system is not adjusted, defective spark plugs, breakdown of high-voltage wires. These reasons can also negatively affect the average fuel consumption of the VAZ 2114.

If you feel the strength to eliminate them, then go ahead! If you have doubts about this, it is better to contact a specialized service center, this will help to avoid unnecessary costs.