All about fuel consumption per 100 km in a VAZ 21099 car

Gasoline consumption indicators

First, it would be advisable to determine how the VAZ 2109 gasoline consumption per 100 km changes, depending on the type of liquid. Let us note the following indicators:

• With A-76 - 0.60 l.
• With A-80 - 10.1 liters.
• With A-92 - 9.0 liters.
• With A-95 - 9.25 liters.
• With A-95 Premium - 8.4 liters.
• When using propane or butane - 10.1 liters.

What is the fuel consumption of the VAZ-2109 (injector, carburetor)

Initially, the technical specifications published on the manufacturer’s website help determine the predicted gasoline consumption of cars of the specified model. The fuel consumption of the VAZ-2109 varies depending on the modification, as well as the type of engine (carburetor or injection). According to statistics, depending on the above-mentioned conditions, gasoline consumption per 100 kilometers ranges from 5.7 to 8.6 liters. Among the factors that can influence this indicator are the time of year (in winter the volume of consumption increases), as well as the specifics of the road - a city or a highway.

Fuel consumption Lada 2109 restyling 1991, hatchback 5 doors, 1st generation

Official data (l/100 km)

VAZ 21099 was equipped only with gasoline engines. The smallest is 1.3 liters. Its power was 64 horsepower. The carburetor was responsible for supplying fuel. The engine is four-cylinder, each with two valves. There was also a version with a rotary engine with 135 horsepower. A carburetor was also installed on it. Fuel consumption per 100 km varied from 7.6 liters with a conventional power unit to 10.1 liters with a rotary one.

The second engine is 1.5 liters. Its power depended on the fuel supply system. If it was carried out using a carburetor, then the engine produced 70 hp, and if it was an injector, then 78 horsepower. Gasoline consumption was registered at 7.6 liters. And the last engine is 1.6 liters. Its peak power was 81 horsepower, and fuel was delivered only through an injector. This configuration consumed up to 7.6 liters of gasoline. Like all our cars of that time, only a manual transmission was installed on the model, which operated in five modes.

We measure fuel consumption on an injection engine

Before taking measures to find problems associated with increased consumption, you first need to measure fuel consumption. This process is not complicated.

Fill up your car, reset the odometer to zero, and continue driving. Try to drive the car quite calmly, without making sudden maneuvers, then the odometer will show fairly accurate fuel consumption readings.

Now knowing exactly how much fuel you filled at your last refueling, divide the amount of fuel used by the kilometers traveled and multiply by one hundred. After which you will have the result of fuel consumption, and determine the fuel consumption with minimal errors. This will allow you to understand whether the problem with high fuel consumption is worth solving, or whether the injector is fine and your car is consuming the right amount of fuel.

How to calculate gasoline consumption per 100 km?

Any driver is interested in the question of how many liters of gasoline his car “eats.” Reading the characteristics of a particular model, we see fuel consumption, which shows how much gasoline the engine needs to travel 100 kilometers in the urban or extra-urban cycle, as well as the arithmetic average of these values ​​- fuel consumption in the combined cycle.

Nominal and actual fuel consumption may differ, usually not very significantly.

1. technical condition of the car - while the engine is being run-in, it consumes more fuel, then the consumption level decreases to the norm specified in the instructions, and as it wears out it increases again;
2. riding style is an individual matter for each individual;
3. weather conditions - in winter the engine consumes more fuel, in summer - less;
4. use of additional energy consumers;
5. aerodynamics - when the windows are open, the aerodynamic properties decrease, air resistance increases, and accordingly more gasoline is needed;
6. aerodynamic properties can be improved by installing spoilers and streamlined elements.

You are unlikely to be able to calculate the exact standard fuel consumption values, down to the milliliter, but you can calculate the approximate consumption for different driving conditions very simply, you don’t need to be a great mathematician for this, you just need to remember the mathematics course for the third or fourth grade and know that these are the proportions.

The calculation formula used by flow calculators is very simple:

Divide the displacement by the mileage and multiply by one hundred - l/km * 100.

What determines the cost of a VAZ?

A front-wheel drive sedan is considered a Russian car, which is intended for traveling on Russian highways. Lada models from 2000 to 2007 have an engine capacity of 1.5 liters. Based on driver reviews, we can conclude that the car feels better in the city than off-road.

Fuel consumption for the VAZ 21099 (carburetor) depends on:

• year of manufacture of the car;
• on the cleanliness of the filters;
• filled with good quality oil;
• on engine volume;
• on the condition of the injectors;
• depending on the type of ride;
• maneuverability;
• from technical characteristics.

Every experienced driver knows that the filter must be changed frequently to function properly.

Getting around the city

The type of driving and all maneuvers around the city result in high fuel consumption. After all, the engine does not work smoothly, often changes speeds, switches, and because of this, LADA gasoline consumption per 100 km exceeds 12 liters.

It is worth noting that if you live in a big city, where you have to stand in traffic jams for a long time in the morning and evening every day, then it is better to turn off the car so that there is no overheating and excessive consumption of gasoline

The fuel consumption of the Lada 21099 on the highway at average air temperature is about 7 liters, this is an economically advantageous fuel consumption. VAZ is a financially convenient car if you monitor its technical condition.

How to reduce fuel consumption

Despite the efficiency of the VAZ 21099, there are often reviews of increased gasoline consumption. The most popular reason is the subjective factor. Driving too dynamically increases consumption by up to 50%. It is recommended to move off smoothly, change gears in a timely manner in the range of 2-3 thousand revolutions, and move on the highway at a speed of 90-100 km/h. There are other problems that, by eliminating them, can reduce fuel consumption on the VAZ 21099:

1. Engine wear. If the compression in the cylinders drops below 8.5 atmospheres, a major overhaul is necessary; after running in, the engine's appetite will decrease.
2. Pressure in the slopes. The manufacturer recommends 2 atmospheres. A decrease in pressure is especially harmful; the car begins to “float” on the road, and consumption increases.
3. Open windows at high speeds increase consumption by 1.5 liters, the turned on air conditioner takes 1 liter per hundred, so it is better to use it on long trips.
4. There is no need to overload the car with tools and other items.
5. Periodically adjust the carburetor and clean the injector; they become clogged, the quality of the mixture is impaired, which leads to overspending. If you don't pay attention to this, the car will simply break down.

FIREBALL 02/27/2010, 21:05

I have long noticed that gasoline is somehow quickly consumed. I measured the consumption (the tank of the 99 seems to be exactly 40 liters). It turned out to be 15 liters per hundred, taking into account the fact that during this hundred I sit in the yard in a car with the engine running for about 2-2.5 hours. Based on the calculation that about a liter per hour is consumed at idle, then the consumption per hundred without “get-togethers” is approximately 13 liters. As far as I know, according to the passport it should be from 7 to 10 liters per hundred, depending on driving. When I was at the service center I also checked the CO-CH. They said that they were normal. The spark plugs are now iridium, I measured them with them. There shouldn't be any problems with combustion. When I did the diagnostics in the summer, they said it was very good. old firmware. Perhaps that's the problem. A friend has a VAZ-2108 with the same engine. Consumption is 8-9 liters per hundred.

What could be the problem?

PS: A friend gave me a ProSport zero-resistance filter today. I set it for myself, fuel consumption, they say, with them increases, but not by much. I took measurements without it.

VAZ 21099-20 1.5 MT 78hp

Fuel consumption rate per 100 km

Not the most popular version, despite the engine technical data typical for Russia. As in other modifications, the unit operates with a 5-speed manual transmission on gasoline. He freely accepts AI92, although his passport requires 95. Consumption is even more modest than that of a similar unit with 70 horsepower: city – 8.8 liters, highway – 5.4 liters. Maximum acceleration is up to 156 km per hour.

Owners about fuel consumption

• Mikhail, Belgorod. For five years I had a 1.5-liter 74-horsepower 99 (2003 onwards). I liked going to the dacha. It takes a little off-road without any problems, and the appetite hardly grows (consistently 9.5 liters). For example, Niva on the same road consumes almost 13 liters per hundred.
• Roman, Izhevsk. I tried chipping my 1999 1.5 MT. Almost nothing has changed, although many talked about saving fuel. The ninety-ninth ate 9.5 liters in the city, and still eats it. Perhaps it’s half a liter less on the highway (6 instead of 6.8), but my wallet laughs at such savings.
• Andrey, Kursk. I learned to drive a 1.5 manual 2001. It’s hard to imagine a better car for a beginner. I fill up with 10 liters and don’t think about fuel for 3-4 days. At the same time, I drive about 60 km/h in third gear. Very economical and without unnecessary hassles.
• Stepan, Rybinsk. Of course, traveling long distances in the 99 is difficult due to the lack of comfort. I had a regular one and a half liter engine (74 horses). The car is old (2000), but it made it to the Black Sea. I needed two and a half tanks (about 100 liters) to get to the resort. At the same time, the consumption according to the meter rarely exceeded 7 liters.
• Alexander, Tambov. 21099 2002 1.5 74 hp I had a serious problem with fuel once. I knew that it was better not to fill up at this gas station, but for some reason I stopped by. As a result, there is carbon deposits on the spark plugs and consumption jumps to 12 liters per hundred. And so it lasted a little less than 10 liters.

Description and technical characteristics of the VAZ-2109 car

Cars with a 5-door hatchback body began to be produced in 1987. Initially, the plant offered versions with 1.3 and 1.5 liter carburetor engines for the domestic market, and a model with a 1.1 liter engine was assembled for export. In the early 90s, the body and interior were modernized, and already in 1995 the first commercial samples appeared with a 1.5 liter gasoline unit with a GM injection system. Car production continued until 2011 (in Ukraine), and the equipment was equipped with an 8-valve VAZ-11183 engine with a displacement increased to 1.6 liters.

The vehicles were equipped with a manual transmission with 4 or 5 forward gears and a cylindrical main pair. Torque was transmitted to the front wheels with MacPherson struts and coil springs.

A torsion beam with shock absorbers and drum brakes was used at the rear (discs at the front). Panels molded from plastic were widely used in interior decoration. The vehicle is equipped with rack and pinion steering (no power assist).

Brief technical characteristics of the VAZ-2109:

• body length - 4006 mm;
• width without mirrors - 1650 mm;
• height (on standard tires 165/70R13) - 1402 mm;
• ground clearance - 165 mm;
• wheelbase - 2460 mm;
• curb weight - 945 kg;
• load capacity - 425 kg.

The VAZ-2109 was equipped with a manual gearbox.

hikaru 02/27/2010, 21:31

The carburetor, there is exhaustion of the Khan's jets (you have to change it - it's useless and you'll come back), if the injector then the Khan's injector - the injectors and brains are short of everything, and the ignition is most likely knocked out. And it’s better to forget about idling, it kills the engine. The engine does not play a role in gasoline consumption; it fills the carburetor and digests the engine. It is best to install a Weber carburetor, with it there is low consumption and a quick start.

By the way, how fast are you moving? if up to 90 km/h then the consumption is 7-9 liters, if more than 100 the second injector opens, the consumption increases (the second injector opens at three thousand engine revolutions) and 120 the consumption is already up to 11. after 120 km/h the consumption is more than 12 liters

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.

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.

Gas consumption and savings

Consumption of liquefied petroleum gas by the LADA 21099 sedan in liters per 100 km.
The difference in the cost of refueling gasoline and gas. Propane consumption for sedans 21099, savings

Methane and 21099. Methane equipment is not compatible with some engines. Check the technical feasibility of installing methane on your LADA 21099 sedan with the manager around the clock.

On average, methane consumption in the city is close to gasoline consumption. On the highway, consumption is 15-20% slower. Methane is cheaper than propane by one and a half rubles per liter.

Reasons for increased costs

There are a number of factors that determine the fuel consumption of a UAZ. They can be divided into three groups, among which are those that depend on the owner himself, the faulty technical condition of the parts or the type of flammable liquid. The influence of the last factor has already been mentioned, so we will focus on others.

The car is not working properly

The average gasoline consumption of the VAZ 2109 per 100 km is significantly influenced by the factors of incorrect carburetor settings, stuck needle and fuel pump (increase by an average of 4 liters). An insufficiently warmed up engine increases consumption by another one and a half liters.

Over-tightened bearings or incorrectly adjusted wheel alignment increase consumption by 15 percent.

Inappropriate spark plug spacing, faulty thermostat, reduced engine compression add another 10%.

Driving method of VAZ owner

The fuel consumption of 2109 per 100 km is also affected by the owner’s driving style - the higher the speed of the SUV, the greater the volume of liquid leaving the tank. When you turn on the headlights, the overall consumption rate increases by 10 percent, and flat VAZ tires have the same effect.

When installing a trailer, gasoline consumption increases by another 60 percent.

Owner reviews

There are much more positive reviews than negative ones, so purchasing a VAZ 21099 is a good economical option for residents of cities and villages. With consistent, calm and purposeful driving, the car does not break down so often, and in terms of fuel consumption it is satisfactory - that’s what drivers write. They also indicate that when the engine overheats, the cylinders are poorly filled and power decreases, but this, first of all, depends on the owner.

Restyling

Most Russians prefer domestic cars to foreign cars, and most of the models were produced a long time ago.

Among modern cars - VAZ-2109. But the vehicle is both technically and morally outdated. Restyling will help give the car a second life.

Many people are interested in where to start. All Russian cars, regardless of the year of manufacture, have a common problem - the level of sound insulation.

This does not apply to those who like to drive slowly, but there are vehicles that accelerate to 90 km/h and above; you have to shout so that the passengers sitting behind can hear the driver.

Dashboard. The next level is advanced car restyling. In this case, the most dramatic changes to the car are coming.

Using fuel with a VAZ carburetor

The amount of substance used depends directly on how the modification of a number of UAZ cars works - on a carburetor or on an injector. First, let’s determine the fuel consumption of the VAZ 2109 carburetor, since it is believed that this type of system has the highest consumption:

• 2109 fuel costs in the city are 8-9 liters per 100 km;
• gasoline costs on the highway - 6-7 liters per 100 km, at a speed of 90 km/h;
• gasoline costs on the highway are 7-8 liters per 100 km, at a speed of 120 km/h.

Malfunction of valves or flaps in a VAZ

One of the main factors in increasing the indicator is a closed or not fully open air damper. You should always check whether it is in the correct position - the handle is facing the owner, and the part itself is in a vertical position. The same problem with an improperly closed solenoid valve or fuel nozzle leads to increased fuel costs for VAZ.

If the sealed mode of the needle valve is violated, excess portions of liquid enter the cylinders.

Problems with EPHH

If the XX system jets have a diameter that is too large, then too concentrated, supersaturated oil will enter the combustion chamber. Their contamination also causes increased consumption and requires immediate cleaning. An even more important factor is the breakdown of the forced idle economizer, which requires immediate repair.

VAZ 21099 1.3 MT 135hp

This is a rather rare version of the compact sedan. The main purpose of creating this modification is import. It was precisely this “charged” engine, as conceived by the designers, that should have appealed to the foreign public. The release of the 135-horsepower engine took place in the same year, 1990, as the debut of the car itself. With such a modest engine size and a non-standard amount of horsepower for Russia of that era, consumption was quite moderate: city - 12.5 liters, highway - 7 liters. Maximum speed is up to 190 km per hour. It is recommended to use AI95 for this installation.

Real gas consumption

• Makar, Yelabuga. I have the so-called sport version with 1.3 liters and 135 horses (1995 onwards). It has enough power, but the carburetor periodically fails. There is no stability at idle, which is why the consumption is about 13 liters in the city. I always try to turn it off when I stop.
• Sergey, Perm. Luxury 99th 1.3 2001. The engine is not bad, but not for this body and the design as a whole. It accelerates quickly, and the consumption on the highway is low (7.5-8 liters). But it doesn’t hold the road well, it shakes and you have to constantly steer.
• Dmitry, Kaliningrad. I don’t understand how I managed to take a VAZ 21099 when domestic cars are very rare in our city. I came across a 1.3 MT with 135 horsepower. I only fill up with 95 gasoline and try not to vomit too much. But the consumption is still cosmic (city - 13.5 liters). It's like a rocket, it eats a lot and flies fast.
• Alexander, Dolgoprudny. At traffic lights I go head to head with the Focus and Nissan Maxima. Of course, my “basin” has a 1.3-liter 135-horsepower monster. The official data almost doesn’t lie, I shoot 10 seconds before hundred. Well, the consumption is quite affordable (city - 12 liters, highway - 10). At least on the standard 1.5-liter version, fuel consumption is 2 liters less.
• Nikolay, Moscow. I drove a 1.3 MT 1999 for three years. The engine is strong, but it’s immediately clear that it’s domestic. When accelerating to 140 km/h, consumption exceeds 12 liters without thinking. And there is noise in the cabin, and it seems that the engine is about to jump out.

Engine VAZ 21099 injector

Modern youth no longer begins their automotive experience with the “classic penny”, because they want more modern and reliable cars. But the financial capabilities of most young people are not so great that they can immediately get behind the wheel of a foreign car, and therefore most novice car enthusiasts buy themselves a “ninety-nine”. And if it is injection, then we can consider ourselves lucky.

How to reduce fuel consumption?

You can reduce fuel consumption in the following ways:

1. Check for fuel leaks.
2. Clean or replace the filter. Pay special attention to the fuel filter.
3. Adjust the carburetor.
4. Try to warm up the engine to operating temperature before starting to drive the car.

In my case, the reason turned out to be a dirty fuel filter and incorrectly set ignition timing. After eliminating the causes, fuel consumption returned to normal, engine power increased, and the car began to accelerate better.

What reasons influence high fuel consumption?

Already experienced drivers can tell exactly why their car, for one reason or another, has high gas mileage. We would like to give you an example of several problems that the owner of a VAZ 21099 car may encounter:

• poor or incomplete opening of the carburetor damper;
• lack of oil in the gearbox - leads to a reduction in transmission;
• the ignition timing is poorly set - early or late ignition reduces power;
• the vacuum accumulator sensor is faulty;
• when a large amount of fuel enters the carburetor.

Setting up injectors on professional equipment

Everything depends on the serviceability of the fuel injector in injection systems. The engine will operate properly and without problems only if the injectors are in good working order and accurately adjusted. Even a minimal inversion of the performance of one of the injectors will affect the capabilities of the engine and its dynamics. And periodic operation of a machine with such nozzles will ultimately lead to expensive repairs of the internal combustion engine.

To adjust the injectors you will need bench equipment. Special tools are also needed. Due to the lack of such equipment in the garage, it is customary to entrust the work of setting up injectors to specialists in a car service center.

Here's how the adjustment is made.

1. The technician at the stand checks the nozzles, determines the tightness, and the degree of pressure at the moment the nozzle needle moves. If it notices discrepancies with standard parameters, it begins the adjustment process.
2. The required pressure is set by rotating the screw with a lock nut, which is responsible for raising the locking needle. This type of adjustment is called smooth adjustment. But stepwise pressure adjustment involves the use of washers with different thicknesses.
3. The degree and angle of fuel spray is adjustable. If the quality of the atomized fuel cannot be normalized, the atomizer is replaced.

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.” 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.

Reasons for high fuel consumption on VAZ 2108, 2109, 21099, 2105, 2107, etc.

Carburetor choke is not fully open

When a warm car engine is running, the air damper in the carburetor must be completely open and positioned strictly vertically. In this case, the “choke” handle must be recessed all the way. This applies to both carburetors 2105, 2107 “Ozone” and carburetors 2108 “Solex”.

fully open air dampers of carburetors 2108, 21081, 21083 Solex, 2105, 2107 Ozone

If the air damper is not fully open, with the choke handle fully recessed, then there is a malfunction. In this case, the volume of air entering the fuel mixture decreases, and the proportion of gasoline increases. The fuel mixture enters the engine cylinders over-enriched, and fuel consumption increases.

the air dampers of carburetors 2108, 21081, 21083 Solex and 2105, 2107 Ozone are not fully open due to their drive being incorrectly adjusted

Sometimes some car owners, having a worn-out engine in their car, try to revive its former throttle response, deliberately set the carburetor choke to some extent, thus forcibly enriching the fuel mixture and slightly resuscitating the engine’s former capabilities. But again, this is fraught with an increase in fuel consumption significantly. The same trick can be done when the engine is running poorly at idle or even completely absent. If this problem is detected, adjust the air damper actuator:

Idle air fuel nozzle holder or solenoid valve is loose

The fuel mixture, in this case, enters the idle system, bypassing the idle fuel jet (inserted into the jet holder or into the solenoid valve - depending on the carburetor model), since it turns out to be loosely pressed to its seat. As a result, a large volume of additional fuel enters the cylinders not only at idle, but also in all operating modes of the car engine. The more you press the gas pedal, the more the vacuum in the carburetor chambers increases and the more excess fuel is sucked into the engine cylinders through the idle system.

carburetor solenoid valves 2108, 21081, 21083 Solex, 2105, 2107 Ozone

In such a situation, on carburetors with a holder (plug), you should check the tightness of this very holder. Do not overtighten to avoid deformation of the idle fuel jet or its seat. The tightening should be minimal, but at the same time not allowing the holder to spontaneously unscrew due to vibration when the engine is running.

On a carburetor with a solenoid valve, we check its performance. With the engine running, remove the plug of the wire going to it from its output. The engine should stall. We put the wire on - we hear a click. If everything is as described, the valve is working properly, it shuts off the fuel supply, there is no need to turn it further. If the engine does not stall after removing the wire, turn the solenoid valve housing slightly clockwise. We remove the wire again. Doesn't it stall? Turn the valve a little more. And so on until we achieve what we need.

The float chamber needle valve is not sealed

If the tightness of the unit is broken, excess fuel enters the carburetor float chamber and, accordingly, further into the engine cylinders. Perhaps in this case, the needle valve has failed or a speck has gotten under its shut-off needle. In this case, it is considered that the carburetor is “overflowing”.

Usually this malfunction is accompanied by difficulty starting a hot engine and popping noises in the muffler.

It should be noted that the leakage of the needle valve is not always clearly noticeable. Excess fuel can seep into the float chamber without causing any obvious problems in engine operation. Only fuel consumption will increase by a liter - one and a half per hundred.

Therefore, in any case, it is worth carrying out a simple check of the tightness of this device. It is described in almost any car repair and maintenance manual. On our website twokarburators.ru these are the articles “Carburetor needle valve 2108, 21081, 21083 Solex”, “Carburetor needle valve 2105, 2107 Ozone”.

checking the needle valve on carburetors 2105, 2107 ozone, 2108, 21081, 21083 Solex

If you detect such a malfunction on your carburetor, you should replace the needle valve assembly. There is currently no point in repairing it, since a new one is inexpensive and is sold everywhere. The only thing you need to do is to be more careful when choosing a valve. A low-quality product will add unnecessary problems and take time for additional diagnostics and repairs.

Larger diameter main metering system or idle system fuel jets installed

The fuel mixture is over-rich. Check the jet markings. The section “Calibration data and parameters of carburetors 2108, 21081, 21083 Solex and 2105, 2107 Ozone” contains basic data on jets, tubes, holes and channels of carburetors 2105, 2107 Ozone, 2108, 21081, 21083 Solex.

The air jets of the main metering system or the idle system are clogged

Clean them by removing the carburetor cover. On the Ozone carburetor, you can unscrew the GDS air jets without removing the carburetor cover.

fuel and air jets, emulsion tubes and emulsion wells of the main metering systems of carburetors 2108, 21081, 21083 Solex, 2105, 2107 Ozone

You can also clean the channels and jets of the idle air system with the top part (cover) of the carburetor removed. For more information about cleaning the idle system of carburetors on our website, see the articles: “Cleaning the idle system of carburetors 2108, 21081, 21083 Solex”, “Cleaning the idle system of carburetors 2105, 2107 Ozone”.

air and fuel jets for CXX carburetors 2108 Solex and 2105, 2107 Ozone

The EPH system is faulty

Either the solenoid valve or any element of the EPHH system of which it is part is faulty. Typically, problems in this system are accompanied by unstable engine idle and/or a persistent desire to stall at forced idle (when driving in high gear with the gas pedal released). Check the EPH system:

Engine air filter clogged

Again, the fuel mixture becomes very rich in fuel, since air enters it with difficulty through a heavily clogged air filter element. Replace the filter element.

heavily contaminated car engine air filter element

Notes and additions

— A decrease in engine power can also occur due to an unadjusted fuel pump drive and, accordingly, low fuel supply. See “Adjusting the fuel pump drive.”

VAZ 21099 fuel consumption reviews

The VAZ 21099 can safely be called a Russian car, unlike its Soviet counterparts in the model range. The front-wheel drive sedan was delivered to the assembly line at the end of 1990. Popularity came quickly, and, despite the end of production in 2005, the model did not leave the market for new cars. At the facilities of the Ukrainian ZAZ, the people’s favorite “99th” received a second life. The sedan was completely discontinued from production only in 2012. For a long time, carburetors were paired with the power plant on the 21099. They were subsequently replaced by injection versions.

Measurement methods

If you determine a large excess consumption of fuel using instruments, first make sure that the instruments themselves and the fuel level sensor are working properly. If not, replace them.

The volume of the fuel tank installed during production on the VAZ 21099 car is 43 liters. Before taking measurements, make sure that your car has an original gas tank. Otherwise, it is necessary to measure the capacity of the non-original gas storage tank.

To measure fuel consumption on an injection machine, you need to fill the gas tank to the neck and measure the number of kilometers traveled until the engine stalls from lack of fuel. It should be taken into account that the capacity of the fuel system as a whole exceeds the volume of the tank by 1 liter.

If your car has a carburetor, you can take a plastic bottle, fill it with fuel, place it in the engine compartment away from the engine and outlet pipes, and tightly connect this improvised gas tank with a flexible hose to the fuel pump. Next, you need to measure the distance traveled by the car before running out of fuel, and you will get accurate fuel consumption indicators.

In addition, some car owners install mechanical water consumption meters instead of a fuel filter. Cheap and cheerful, but not recommended.