VAZ 2107 carburetor eats a lot of gasoline

Reasons for overspending

Let's start with the fact that in practice this car can consume different amounts of fuel, ranging from 7 to 11.5 liters. This depends on what volume it has, as well as on the modification of the motor itself. The main reasons why a carburetor or power unit with distributed fuel injection begins to consume more fuel are the following phenomena:

• the appearance of deposits on the walls of the nozzles, which leads to a change in their internal cross-section;
• excessively clogged air filter element;
• breakdown of sensors responsible for distributed fuel injection;
• incorrect heat rating on the spark plugs or excessive carbon deposits;

• dynamic driving style;
• cold frosty weather, since winter consumption is traditionally higher than in summer.

Communities › VAZ: Repair and Modification › Forum › VAZ 2109 eats gasoline help urgently

The problem is that the car is a VAZ 2109 carb. 1.5 8kl. He eats a lot of gasoline and over the last three days he has filled up for 940 rubles. There is less than a quarter of a tank left and I have driven about 180 km. I cleaned the carburetor in February and had the ignition adjusted by the carburetor technician. what could be the problem? There is no gasoline dripping anywhere. help me please.

Yes, there are many reasons why gasoline can be wasted... the air filter, spark plugs, the amount of oil, your driving style, finally))) and just in case, check the entire gasoline line again... who knows?

I changed the spark plug oil yesterday, I also changed the air pump, I drive calmly and sometimes I press on the gas.

Well, maybe I’m not good at this, but still, maybe you’re sucking air somewhere, so it’s eating)))

what do you mean it sucks air, please explain in more detail.

By the way, maybe... the carburetor is sucking air, perhaps in the place where it is attached to the engine, try removing the carburetor, applying sealant and screwing it back on

if there had been air, she would have been hurt a lot

How does the car behave compared to what it was before?

I got my license 4 days ago, before that it was in the garage, uh, almost never left. When I started driving, at first I thought everything was fine, I filled it up for 500 rubles. Before that I used 95 gasoline, because the smell of 92 was, to put it mildly, stinky, and when I started filling it with 95, the stench disappeared. 92 and 95 eat the same. The carburetor did the ignition, too, the spark plugs made no difference.

Maybe it’s because the car is 21 years old that’s why it consumes so much gasoline. She eats like a jeep. 200 km 940 rubles in the city.

The age of the car does not affect fuel consumption, high consumption can only come from incorrect adjustment of the carburetor, when cleaning the carburetor, a new repair kit is installed, thus, if the carburetor is not clean, he can install jets of higher capacity or jets of lower air capacity, I have car 93g.v 1.5 volume carburetor in the city 7.5-8l, on the highway 6.5-7l this despite the fact that the carburetor is far from new and my driving style is far from calm, but I repair and adjust the carb only myself since no trust in services

yeah, I don't trust them either)

check if the needle is holding! maybe you have gasoline pouring in buckets)

unscrew the spark plugs and see what they look like if they are smoked it means the mixture is rich, in general you need to do this, adjust the valves then the carb and ignition

My father fiddles with carburetors, no one goes to the salon, everyone goes to him! I talked to him, he said that there are a lot of reasons, everything needs to be looked at consistently! Look at the jets as written above, maybe others have stuck it in so that I can come to them again!) )) Look at the spark plugs for carbon deposits and check the gap! As for the sealant as written above, I personally don’t advise you, what do you think, why are there special pads there?))) It’s just from the bastards, when screeding it turns into a groove in places! Take it apart! into pieces and put it on a flat surface, you will see for yourself the gaps. The problem with air leaks can be easily solved, take new gaskets, a round emery stone of large diameter, so that all the surface on the stone is at once and slowly remove it in a circular motion! When I helped my father, we did this they did! Knowing the secrets of the carburetor mechanic, my personal advice is to find an honest worker through a good friend and talk to them like a human being so they can take a look, but in the salon they will just cheat you, and in general they do everything on the fly! And if you find a good carburetor mechanic, fumbling around, they’ll set you up so that you won’t eat much and you’ll squeeze all the juice out of the car!))) My father set it up so that in the city I eat little, but on the highway I fly as I want and at 100 to 5 liters))) Good luck with your decision Problems!

Guys, I finally found the reason. the whole time the car was running at 92, then I started filling it with 95 and started eating it like an elephant, then I filled it with 92 again and it seemed like I drove a little over 100 kilometers, there was half a tank, now there’s about a quarter of a tank left. But Russian cars have one problem: one thing broke another. Now she eats butter and it’s not even bad, she ate the level in 4 days. Yes, my oil was leaking, but not enough to eat up the level.

everything in the carb is the same garbage, it eats buckets of gasoline. Today I saw a black lady from the pipe and realized that it was an overflow. I revved it up to 6000 tons, because up to 3000 tons there was no blackness visible. Work plan float chamber - setting the floats

My cravings have also dropped lately and are eating up a little more than before. They checked everything everywhere, everything is fine. They say that maybe it’s time to change the rings. (mileage 197,000)

Moscow ! go to a proper mechanic, they’ll tell you everything, you might as well change the repair kit, they changed your fuel miracles, if it’s 95, then you’re calculating the consumption incorrectly! Not rubles, but the number of LITERS filled in, consumed. Not in quarters, but in liters. For mileage in constant mode, THIS is your consumption. You could sit and warm up, but the mileage was still there, gasoline was running out. I.WHAT? How do you calculate this, based on engine hours? City of traffic lights and traffic jams!

Manufacturer data

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.

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:

The idle air fuel nozzle holder or solenoid valve is not tightened tightly

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.

Solenoid valves for carburetors 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.

Features of installing a solenoid valve in a Solex carburetor

The fuel level in the carburetor float chamber is too high

The level is higher than normal - more gasoline is supplied, it flows more actively through the diffuser nozzles, and the fuel mixture is over-enriched. And this, in addition to high fuel consumption, as a result “floods” the spark plugs (they turn black), the process of fuel combustion in the combustion chambers is disrupted (the mixture does not burn completely and is thrown into the exhaust tract, where it explodes and shoots into the muffler).

It is necessary to adjust the fuel level in the float chamber:

A gap of 2 mm between the lower corner of the float and the cardboard spacer is optimal for setting the required fuel level in the Solex float chamber

The gap is 6.5 mm between the plane of the cover and the float of the carburetor Ozone 2105, 2107

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:

The economizer of power modes is faulty (Solex carburetor)

If the economizer diaphragm is leaking, its pusher will press on the shut-off valve ball, opening it. In this case, the fuel constantly flows through the economizer into the GDS atomizer, further enriching the fuel mixture at all engine operating modes, and not just at maximum loads. Excessive fuel consumption in such a situation is small, but it does occur.

You can check and replace the economizer diaphragm without removing the carburetor from the engine. To do this, unscrew the three screws securing the cover and remove it. Under the cover is a diaphragm with a return spring. If it is torn, replace it with a new one.

The worst case of a power mode economizer malfunction is a broken shut-off valve. In this case, it is easier to muffle it by soldering it with tin.

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

— The reason for high fuel consumption may be an unregulated fuel pump drive, and, accordingly, too much fuel supply (the needle valve cannot withstand the pressure, the carburetor “overflows”). See “Adjusting the fuel pump drive.”

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VAZ 2107 carburetor eats a lot of gasoline Link to main publication

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How to find out your gasoline consumption level

First of all, in order to understand the scale of the existing problem, you need to measure the existing fuel consumption values. To do this, you need to stop by a gas station and fill a full tank of gasoline, which holds 39 liters. At the same time, the current mileage traveled by the vehicle must be measured and recorded. After approximately half of the fuel has been consumed, the tank is refilled to capacity. The mileage readings on the odometer are recorded again.

Now we have the initial data necessary to calculate what fuel consumption is inherent in our VAZ 2107. If this value is significantly higher than what should be according to the service book, it means that there are faults in the injection system, or the carburetor requires more precise settings.

VAZ 2107 injector

After they released a car with distributed injection, car enthusiasts are interested in what the fuel consumption of the VAZ 2107 (injector) is. The reason for this curiosity lies in the higher fuel consumption than the manufacturers indicate.

The VAZ car is familiar to every Russian. Since 1982, the VAZ 2105 was replaced by a new model - the “seven”, that is, the VAZ 2107. This was visible in the changes that the car underwent.

They hid in changing the appearance of the hood, adding some details inside the car, and an aggressive radiator grille appeared. City of production – Nizhny Novgorod, Russian Federation.

The fuel consumption of a VAZ 2107 per 100 km with injectors of the AI-92 and AI-95 brands is presented as follows:

• on the highway - 6.7-8.5 liters;
• in urban conditions - consumption increases to 11.5 liters.

Plus, the factors of gasoline quality and the driving style of the car enthusiast are added to everything. Therefore, some have more consumption, others have less.

How does this system work?

In order to correctly determine in the future why you are using a lot of fuel, you need to know how the engine power system works. With this knowledge, you will already know how to reduce the fuel consumption of your UAZ.

After air enters the intake manifold, the volume will be measured by a certain sensor. All this information will then go to the ECU. The process will receive the task of injecting fuel through an injector, or, to be precise, through injectors. Everything that is released into the atmosphere is detected by the exhaust measurement sensor. The data obtained helps determine the actual fuel consumption.

Already with knowledge about the operation of the entire system, it is easier to find the exact reason for the unreasonably high consumption of gasoline.

Reasons for overspending

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

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

We diagnose ourselves

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

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

Statistics

The fuel consumption of a Lada 2107 with an injection engine is perfectly shown by statistics provided by the manufacturer and figures received from car enthusiasts.

The manufacturer claims that when driving on the highway, the car will normally consume 9 liters of gasoline, but in reality we see that consumption does not exceed 7.75 liters.

Driving in urban conditions should consume only 9.70 liters, but here the figure exceeds 10.25 liters. With a mixed type of driving, the readings from the manufacturer and the car enthusiast practically coincided, the former had a consumption of 8.50 liters, and the latter - from 8.82 liters. However, we see that in practice the consumption is higher.

The passport does not indicate how much gasoline is consumed when driving off-road. Having checked it ourselves, we see that such driving requires more than 9 liters of fuel.

Engine versions

Model VAZ 2103

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

Model VAZ 2104

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

Model VAZ 2106

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

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

RasxodTopliva.ru

What can you say about an injection engine?

As soon as the international Euro 2 standards were adopted in Russia, the production of carburetor sevens ceased.
The manufacturer gradually mastered the production of internal combustion engines with distributed fuel injection. This made it possible to change the technical characteristics of the vehicle for the better, make engine operation more stable, and also reduce the permissible consumption of high-octane fuel. This should have meant that the car had become more economical to operate compared to its predecessors. However, during further operation, a number of drivers noticed an increase in consumption. This became especially acute when driving within a busy city. It is not surprising that car enthusiasts have begun to think more and more about how to reduce excessively high gas mileage on “Sevens”.