Why do I have high fuel consumption on a VAZ 2109 carburetor?

VAZ 2109 how to make a carburetor economical, the Pekar carburetor used on VAZ cars

How to make a carburetor economical on a VAZ 2109 is a question of interest to all owners. Many believe that this is practically impossible, others try to regulate and even achieve some savings, just to make the carburetor on the VAZ 2109 economical, it is important to know its structure, as well as the reasons that cause increased gasoline consumption. Anyone can achieve real savings, just follow our recommendations.

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.

Tips for saving fuel

The first adjustment of the Solex is performed during the assembly process. This is the installation of the trigger drive cable. Press the “choke” handle all the way, insert the cable into the hole in the lever, and clamp its casing on the bracket. Then secure the cable with a bolt when the damper is in the “fully open” position and check the operation of the mechanism.

How to reduce fuel consumption Niva 21213

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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

Quality screw removal method

With Solex carburetors, the XX channel in the body itself often becomes clogged, and in order to clear it thoroughly, it is necessary to remove the quality screw. But this screw, as mentioned above, has a very tight fit and is not easy to get out. There are several methods for dismantling a part; we will consider only one option.

We take a piece of an old antenna from any radio receiver, select the outer diameter so that the tube fits into the channel of the carburetor body, usually the outer thickness of the “puller” is about 4 mm. We cut off a small piece, make a cut at one end (about 1 cm deep), use another quality screw (a spare one, or you can buy it specially in a store), and check how tightly the tube fits onto the head of the screw.

Now you can unscrew the screw and use a homemade puller to remove it from the KU body.

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

Calibration data for the ratio of large diffusers and jets (manufacturer's plant)

To this day, they remain the most preferred, since their design is simple, while they provide excellent dynamics for the car, but their fuel consumption varies from 10 to 13, 14 liters, which repels potential buyers. To shut off the supply of gasoline to the first chamber, more precisely, to its transition device and to the XX device, a valve is used, which is called an electromagnetic valve.

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.

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.

Are the wheels different on different models and modifications of the Lada Granta?

An increase in flow rate can cause misalignment of the needle valve needle, incorrect position of the main fuel jet, idle jet, or throttle valve. Fuel consumption is calculated using our own, empirically derived formulas related to the vehicle’s load, the total weight of the tilt or tipper road train, and the characteristics of the flat or mountain route.

Air jets 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.

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

Car chassis

General diagram of the DAAZ 2108 unit. Diagram of jet placement. Diagram of purging the lid channels. Fuel jets are removed with a wooden stick or toothpick. Replacing the needle valve. This is what the floats installed on the Solex lid look like. These adjustments are carried out when the engine is unstable at idle and when certain symptoms of improper operation of the power system appear.

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:

EPHH Solex 21073

Malfunction of the vacuum ignition timing regulator

Increased consumption can be caused by carburetor malfunctions such as clogged air jets; malfunction of the EPH system; a loose solenoid valve and, as a result, fuel leakage between the nozzle and the channel walls; economizer malfunction; incomplete opening of the air damper, leading to constant over-enrichment of the mixture. If, under heavy load and sharp acceleration, your fingers begin to noticeably knock and engine detonation appears, you should move the distributor a little to minus, then check the car again while driving.

Power mode economizer faulty

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.

Power mode economizer diaphragm

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.

Adjustment sequence - Engine malfunctions

1. Charge the battery;
2. Warm up the engine to operating temperature;
3. Turn on the headlights, audio system and other elements that consume electrical energy;
4. Achieve maximum idle speed;
5. Rotating the quality screw, reduce the speed by 50-150.

Preparatory work • Remove the air filter housing and remove the choke lever completely.

What to do if there is high fuel consumption?

If you wish, you can slightly moderate the engine’s fuel appetite on your own.

Clogging of parts of the small branch of the crankcase ventilation system leads to increased fuel appetite of the car engine

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”).

You can’t save money without clean air – let’s inspect the filter

Often the cause of increased fuel consumption is a clogged air filter, which motorists often forget about. Checking its condition is quite simple - you need to unscrew the top cover of the air filter, then lift it in front of you and look through it at the light. If the gap is not visible, then it is really very clogged. Accordingly, it is necessary to install a new air filter.

Take this opportunity to clean its casing and also remove dust and debris from the air pipes. This will somewhat extend the life of the new filter and ensure good air flow.

Cheboksary. 2109 for repairs. FUEL CONSUMPTION again!

What causes high fuel consumption on the VAZ-2109

The reasons are mainly as follows:

1. The carburetor air damper is not open enough. When the motor is running, this mechanism is carefully closed and in a vertical position. In this case, the “choke” handle should be pulled out towards you. If the damper is slightly open, it causes a malfunction. In this case, gasoline is consumed in large quantities, and the volume of air that enters the fuel mixture decreases. To solve this problem, some owners close the carburetor air damper, thereby enriching the fuel mixture. However, this threatens to increase fuel consumption several times. It is better to adjust the air damper drive, and then the problem will be partially solved.
2. The fuel nozzle holder is not installed tightly enough. With this problem, the fuel mixture enters the cold running system, bypassing the fuel nozzle. This leads to fuel entering the cylinders not only at idle, but also in any mode. To fix this problem, you need to check the tightness of the holder. Over-tightening is not allowed because this can lead to deformation. You need to tighten it carefully, but at the same time so that the holder can twist itself out from vibration. On a carburetor with a solenoid valve, you need to check how well it functions. On the motor you need to remove the plug and put on the wire. If the valve is working properly, then shut off the fuel supply by turning the housing clockwise.
3. Lack of tightness of the needle valve of the float chamber. With this problem, excess gasoline enters the float chamber and then into the engine cylinders. This often occurs if the needle valve is faulty. In this case, you need to check the tightness of the device. This procedure is described in any instructions or manual for using the car, so it will not be difficult to perform. It is advisable to replace the needle valve if this problem occurs. There is no point in repairing, since you will have to pay more for repairs than for a new mechanism.
4. There are fuel jets for the main metering system. In such a situation, the fuel becomes over-enriched. Here you need to check the markings of the jets. This is a rather complicated procedure, so it is better to ask specialists for help.
5. The jets are too clogged. This is a fairly common reason, which is absolutely easy to solve. You need to clean the jets by removing the carburetor cover. This can also be done without removal, but in this case you will have to spend a lot of time and effort.
6. Malfunction in the forced idle economizer. The solenoid valve or other system mechanism may be faulty here. This usually occurs due to rough idling of the engine. You need to check the system and troubleshoot problems.
7. The engine filter is clogged. The fuel mixture is greatly enriched in fuel as air enters it through the filter element. It is necessary to clean the clogged elements, and then the problem will be eliminated. This must be done carefully so as not to damage anything.

It should be noted that too much fuel can be consumed not only due to problems with the carburetor.

It happens that such a problem is provoked by the following phenomena:

• faulty motor or injector;
• problem with engine thermal conditions;
• the ignition timing is incorrectly set;
• lack of tightness of fuel system elements. In this case, gasoline simply flows out of the gas tank;
• The car wheels do not release the brakes well. This is the most common reason for fuel consumption. This happens due to the fact that the rolling resistance of the machine increases;
• Wheel bearings that are too tight. In this case, the resistance to movement of the vehicle increases, resulting in fuel consumption;
• low tire pressure. This can be checked using a pressure gauge;
• wheel mounting angles are broken;
• problems with spark plugs;
• problems with the centrifugal and vacuum regulators.

As we can see, there are quite a few reasons for the high fuel consumption of the VAZ-2109. In order to find out what exactly caused the loss of gasoline, you need to understand your car very well and thoroughly know the design of the vehicle. If you find it difficult to determine and eliminate the causes of a malfunction, then you can always contact a technical service, where this problem will be quickly resolved. From time to time, the car must be shown to specialists so that it functions properly for a long time and does not require frequent repairs.

Breakdowns that cause increased consumption Pros and cons

Video: setting up the Ozone carburetor • When excess fuel burns, the idle speed returns to normal until the next drop falls.