Owning a domestic car means low costs for spare parts, consumables and fuel. Small engine volumes installed on the entire range of models allow serious savings on fuel. It is clear that a sudden increase in gas mileage becomes a problem, especially when using the car every day. In this article we will look at why the VAZ 2114 (injector, 8 valves) has high fuel consumption. There are several reasons for this problem, but most of them can be eliminated with your own hands.
Useful video:
Advice! In order to save money and not buy unnecessary spare parts, we recommend conducting computer diagnostics of the car. In most cases, there will be errors in the ECM that will tell you the direction in which to go to correct the problems.
What is the norm for a VAZ 2114?
The proper condition of all vehicle systems depends on regular maintenance. Timely replacement of filters and oil and the use of only high-quality fuel allows you to extend the uninterrupted operation of the main units.
On a working “four”, consumption with a volume of 1.5 liters should not exceed 6 liters when driving on the highway. In the city, the rate of burned fuel per 100 kilometers fluctuates around 9-10 liters. On average, a working car “eats” no more than 7.5 liters in mixed mode.
If you observe high fuel consumption on the VAZ 2114 only in the cold season, then you should understand that exceeding the specified data by 1.5-2 liters is the norm. If you observe a serious increase in the “gluttony” of the engine, carry out diagnostics of the car.
On versions with 16 valve engines, consumption remains approximately at the same level as on 8-valve engines. The most economical 126 engine installed on the 2114 consumes about 5 liters on the highway.
Exceeding the given consumption indicators means there is a malfunction in the ignition or fuel supply system. The condition of the motor itself also affects its “gluttony”. To reduce the performance to factory values, you should find out the reasons for the high fuel consumption on the VAZ 2114.
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.
Other reasons for excessive fuel consumption include:
- malfunction of the oxygen supply sensor;
- low level compression;
- problems with the air flow sensor;
- late ignition, clogged catalyst.
In any case, it is necessary to comprehensively diagnose all car systems, and then, based on the detected problems, select the most effective ways to eliminate them.
Spark plug
Spark plugs are the most important element in the system for supplying sparks to the cylinders. Plugs are responsible for producing a spark that ignites the fuel-air mixture in the cylinders. Their wear or non-compliance with factory requirements leads to the problem of improper detonation.
Useful : Engine trouble on VAZ 2114 (11 reasons)
Spark plugs are a good indicator of problems with the combustion process. Black deposits on the spark plugs mean late ignition, while white deposits indicate a lean mixture. This element of the system should be changed regularly. Poor condition of high-voltage wires or a faulty ignition coil will reduce the life of the spark plugs. Their cost for model 2114 is small, so replacement should be done every 25-30 thousand kilometers.
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:
- Regularly replace the air and fuel filter. In this case, preference should be given to factory elements.
- Monitor the condition of the spark plugs and replace them according to the recommendations.
- Periodically measure the tire pressure level and monitor the condition of the brake system parts.
- Refuel your car only at time-tested gas stations.
- Maintain cleanliness of components and assemblies of the engine compartment.
High voltage wires
Poor manufacturing quality of the factory wires that transmit the spark to the spark plugs leads to early wear. Having pierced the wires to the engine body or the complete absence of a spark along it is a signal to replace the armored wires. It is recommended to install silicone armored wires, because... they are resistant to temperature changes. Even if there is no visible damage to the wire, micro-breakdowns may be present. The presence of breakdowns can be determined in the dark. Look under the hood with the engine running and carefully examine each armored wire.
If there are breakdowns, increased fuel consumption on the VAZ 2114 will be ensured. Like spark plugs, if this component of the system malfunctions, it disrupts the process of ignition of the mixture. This will be indicated by a flashing check on the dashboard.
The most obvious
First, the owner needs to conduct a small technical inspection of his car. Not everyone knows that you can reduce the fuel consumption of cars by choosing the right tire size. This, as well as the quality of the tires, gives better rolling and, therefore, lower fuel consumption, because the narrower the tire, the less rolling resistance it has. This allows you to reduce consumption.
It is also necessary to check the tire pressure. Reduced pressure can increase fuel consumption per 100 km in a VAZ-2114 by 15%! Faulty CV joints and wheel bearings may be involved in increased gas mileage if they are poorly adjusted, greased or worn out.
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.
Mass air flow sensor (MAF)
The most expensive sensor in the “four” is the mass air flow sensor. It is very sensitive to dirt and oil. Untimely replacement of the air filter and wear of the piston group lead to contamination of the mesh of the mass air flow sensor. A faulty sensor gives incorrect readings about the amount of air consumed and prevents the computer from forming the mixture normally. This increases fuel consumption. The check on the dashboard may not indicate a problem.
A malfunctioning mass air flow sensor is a serious problem. With this problem, there are failures in acceleration, engine shutdown after engaging neutral gear, and constant “floating” of revolutions. To correct the situation, you can clean the mass flow sensor housing and the mesh using chemicals. Before purchasing a new mass air flow sensor, confirm that the old one is faulty with a multimeter. The price of a new spare part is about 3 thousand rubles.
INCREASED CONSUMPTION, WHAT TO DO
Let's look at the main points that car owners face.
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 on
CAUSES
The reasons for high fuel consumption can be so different that a simple car enthusiast will most likely be able to understand only the most standard and simple cases. Often many signs are interrelated. For example, black smoke from the exhaust pipe may be accompanied by popping noises.
Black smoke indicates the fuel mixture is too rich. Causes:
- The settings of the engine control unit are lost;
- Nozzles are clogged;
- Spark plugs are faulty;
- The MAF (air flow sensor) is acting up;
- The fuel pressure regulator creates excess pressure in the fuel system;
- The camshaft position sensor does not work.
High fuel consumption of the VAZ 2114, accompanied by unstable engine operation:
- The idle speed controller has failed;
- The exhaust valve in one of the cylinders burned out;
- High-voltage wires are faulty;
- Weak compression in the cylinders, the piston group requires repair (replacement of piston rings, boring of cylinders);
- There are defects in the ignition coil;
- There is air leakage through the intake manifold.
It would seem, how can there be increased fuel consumption when the fuel mixture is obviously lean during suction? The thing is that the proportion of air and fuel must still be observed. And more air requires more gasoline.
The engine runs smoothly, but the car drives poorly, and the fuel quickly disappears from the tank:
- Malfunctions in the brake system (the working brake cylinder is jammed, the handbrake is not adjusted).
- The air filter element is clogged.
- Retarded ignition is set on the engine control unit.
- The oxygen sensor is faulty, the catalyst is clogged.
- The tank is filled with gasoline with a low octane number, or the fuel contains unwanted impurities (for example, water).
Protect your car from low-quality fuel - refuel only at proven gas stations
Sometimes there are such cases that it takes a long time to guess why fuel consumption has increased and the car does not drive. Let’s say, this is an interesting point: experts found the solution only two weeks after the defect appeared. The car was "eating" gasoline and stubbornly did not want to go above a speed of 90 km/h. It was the muffler. The partition inside the can fell off and half blocked the path to the exhaust gases. There seems to be exhaust from the pipe, but the car does not drive. After replacing the muffler everything fell into place.
INFLUENCE OF SENSORS ON FUEL CONSUMPTION
Many sensors affect fuel consumption in cars with an injector fuel system. But it’s probably not worth blindly asserting that fuel consumption will immediately increase due to a malfunction of any sensor. For example, a knock sensor only prevents detonation knock when refueling a car with low-quality gasoline and commands the control unit to set a later ignition. With high-quality fuel, consumption will be normal.
Increased gasoline consumption will not be too noticeable even if the throttle sensor is faulty; it depends more on driving style. When you smoothly press the gas pedal, the fuel does not “fly out” into the pipe. Another thing is that if the car is constantly jerking, it is almost impossible to drive.
Malfunctions of the air flow sensor (or absolute pressure sensor), lambda probe, and phase sensor (camshaft position) have a noticeable effect on gasoline consumption. But the “dying” of the crankshaft sensor more often leads to the fact that the engine completely stops starting.
WHAT TO DO
What can an ordinary car enthusiast do with his own hands to somehow reduce the “gluttony” of his car?
We should not forget that timely prevention is simply necessary for normal fuel consumption.
To do this you need:
- Change the air filter element periodically. In this case, factory elements should be installed (a dense fabric filter may have greater air flow resistance);
- Carry out preventive maintenance of spark plugs and change them on time;
- Monitor the condition of the brake system and tire pressure;
- Keep the engine compartment clean. Salting of high-voltage wires leads to the fact that the motor begins to trip;
- Refuel at reputable gas stations.
And in case of malfunctions in the engine or fuel system, diagnostics should be carried out by contacting specialists!!! Article 4: Technical characteristics of the VAZ 2114 engine
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.
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.
Lambda probe
The oxygen sensor in 2114 is an unreliable element. Its malfunction affects the stability of the engine. When the lambda probe breaks down, the engine at idle starts to work with dips. Its malfunction is first indicated by a check on the dashboard. The built-in self-diagnostic function also allows you to determine the error code. Replacing the lambda probe is done by yourself. You can continue driving if it breaks down, but this will increase consumption.
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.
Fuel injectors
Proper operation of the fuel supply system is the key to obtaining full power from the engine. Lack of fuel leads to increased fuel consumption. Clogged or inoperative fuel injectors are a serious problem. Cleaning them is possible only after completely dismantling the fuel rail. They directly affect fuel consumption. Sudden changes in the direction of increasing the “gluttony” of the engine indicate possible contamination of the injectors. There are special stands for cleaning them. It is also worth checking the condition of the wiring and chips on the ramp. If one of the injectors is not working, it will lead to engine stalling and excessive fuel consumption.
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.
Throttle Position Sensor (TPS)
The TPS is responsible for determining the angle at which the damper is rotated. The power consumption, engine power, and dynamic characteristics of the car depend on this. Correct mixture formation is also impossible without correct indications from the TPS. Symptoms of its malfunction are floating speed, dips and jerks during acceleration, and the appearance of a “check” on the dashboard.
Idle air control (IAC)
Maintaining idle speed is the main function of the IAC. The regulator periodically fails. This is reflected in the smoothness of gear shifting, maintaining warm-up speeds and gasoline consumption. The cost of the regulator is 200-300 rubles. Changes in minutes.
As you can see, there are many reasons for the increase in the “appetite” of the VAZ 2114 car. Timely diagnostics, replacement of all filter elements and a calm driving style will reduce the likelihood of breakdowns.
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
