Carburetor VAZ 2109 Solex High Fuel Consumption • Ignition fault

Quick repair and precise adjustment of VAZ 2108/2109 carburetors: instructions and tips

One of the most common models in the country produced by AvtoVAZ can be considered the “eight” or its modification, the “nine”. Owners of VAZ 2108/2109 cars have been convinced in practice of the performance of their vehicles and their ease of maintenance. In order to prevent any malfunctions in the operation of the machine in a timely manner, you need to carefully monitor its technical condition. One of the main tasks of the driver is to control the operation of the carburetor device on the VAZ. The car owner can perform almost all types of repairs and adjustments with his own hands, since the carburetor design has a simple structure.

Carburetor mechanisms of the Solex series are produced at the Dimitrovgrad Automotive Accessory Plant. The designs are intended for use with front-wheel drive VAZ vehicles, in which the engine unit is located transverse to the body.

The standard model for equipping the VAZ 2108/2109 is the DAAZ 2108–1107–10 carburetor. It is paired with a 1.3-liter engine. Carburetors 21083–1107010 are installed on 1.5 liter engines.

The DAAZ carburetor is used to equip all cars of the eighth and ninth models

Modern equipment of the VAZ 2108/2109 is provided by carburetors of more advanced models, since they are equipped with a starting device in automatic mode:

modification 21083–1107010–31 has one stage of automatic control and start in a given mode;

modification 21083–1107010–35 is equipped with two stages of air damper control, which ensures more stable operation of the power unit;

modification 21083–1107010–62 is similar to the previous version of the carburetor mechanism, but has the addition of an electrical air-fuel mixture mixing system.

Sequencing

If the accelerator pump nozzles are incorrectly adjusted, the nozzles are replaced or adjusted so that the fuel jets are directed exactly into the hole that appears when the throttle valve is opened, without intersecting. For example, in order to achieve more stable operation of the internal combustion engine at idle, it is worth abandoning the EPHH forced idling economizer mechanism and installing a plug instead.

Setting the ignition timing - Ignition fault

1. After this, you will need to disconnect two drives from the carburetor body (one goes to the air damper, the other goes to the throttle). In addition, it is immediately recommended to disconnect the return spring and its retainer from the drive.
2. Next, the wire is disconnected from the forced idle economizer screw.
3. After loosening the clamps, you will need to remove the fuel supply pipe and the hose that works “for return”.
4. The screw securing the heating block is unscrewed and the block is removed.
5. The ventilation hose and vacuum hose are disconnected from the fitting at the top of the carburetor.
6. After disconnecting all lines, it is possible to dismantle the carburetor assembly itself. To do this, you will need to unscrew the four nuts that secure the carburetor with studs to the intake manifold. The device is pulled out along with the gasket.

Ignition malfunction • Both on the VAZ 2107 carburetor and on other cars, high fuel consumption can be caused due to low tire pressure.

Practical recommendations

Fuel consumption is affected by:

• technical condition of the machine;
• operating features.

In order to achieve more economical consumption, it is necessary to promptly clean and replace certain components of the mechanism.

In particular, an increase in the amount of gasoline or gas consumed is often a sign that the engine has almost exhausted its resource. Wear of the cylinder-piston increases the gaps between the cylinder walls and the rings. Because of this, exhaust gases and the fuel-air mixture enter the piston space. For the same reason, compression in the cylinders drops. The warm air mixture cannot burn completely. Therefore, part of the mixture remains unused and simply flies out through the exhaust pipe. Engine wear affects its functioning. Because of this, the car accelerates poorly. The driver has to press the pedal harder to accelerate the car. Taking all this into account, it is not difficult to conclude that in order to reduce gasoline or gas consumption, you must first diagnose the engine. You need to measure the compression, listen to whether the engine makes any unusual noises during operation. If worn components are found, they must be replaced.

Also, the consumption of gasoline or gas depends on the condition of the gas distribution mechanism. If carbon deposits that form on valve seats and edges are not promptly removed, this will lead to loss of compression due to a loose fit.

Cleaning the valves and, if necessary, repairing the cylinder head will significantly reduce gasoline/gas costs. It is important to promptly diagnose the gas distribution mechanism and promptly replace worn parts.

Fuel consumption also depends on the carburetor. If you install a contactless ignition system and a Solex carburetor, then this combination will reduce the amount of gasoline or gas consumed. It is very important to adjust the carburetor correctly. It will be possible to reduce consumption by installing jets with a reduced cross-section. However, this will lead to a decrease in the dynamics and power of the machine. After this adjustment you will have to forget about overtaking. It will be very difficult to accelerate such a car. Therefore, it is better to carry out adjustments without replacing the jets. It is necessary to adjust the carburetor in such a way as to achieve a “golden mean” between power and fuel consumption. If the carburetor is clogged and incorrectly adjusted, fuel dosing is disrupted. Therefore, regularly check the condition of the carburetor and wash it periodically.

Setting the fuel level

Adjusting the amount of fuel in the chambers of Solex carburetors is a simple procedure and does not require specialized equipment. Although in the factory this adjustment is performed using a special template, which simplifies and speeds up the work. But at home you can do without this template. To carry out adjustment work yourself you need:

• screwdrivers (phillips, flat);
• ruler (preferably a caliper);
• round rod with a diameter of 2 mm (wire or drill will do).

With such equipment you can quickly complete all work.

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.

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.

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

High fuel consumption VAZ 2109 carburetor causes Carburetor malfunction

To prevent the carburetor from creating problems for you, try to use high-quality fuel, lubricate quality screws, and check the serviceability of the choke cable. In the formula Qн 0.01 x Hsan x S Hw x W 1 0.01 x D, the basic indicator becomes the consumption without load in running order Hsan, which is individual for each truck.

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.

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.

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.

Insufficient tire pressure, tire wear Adjust the float

• in traffic 9.1 l;
• on average 7.7 l;
• on the highway 5.5 l.

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.

The secret of 99 - how is people's love justified?

The car, whose history goes back almost four decades, is still considered one of the most successful VAZ assemblies. Until 2004, all VAZ 21099 models had a carburetor engine type, and only after 2004 did manufacturers replace this device with an injector. So the carburetor 99, a symbol of the dashing 90s, is today found on the roads of post-Soviet countries no less often than modern cars.

The car has front-wheel drive, a 1.5 liter 4-cylinder engine. A VAZ car can accelerate to 160 km/h with its 70 hp. Some models have a 1.5i engine with 76 hp, although not many of these cars were produced. The carburetor of model 21099 is very economical, the average consumption of the VAZ 21099 reaches 7–7.5 l/100 km. Fuel consumption on the highway with high-quality fuel and average speed is 5.5 liters.

Setting up the float chamber. Float adjustment

Again, the fuel mixture becomes very rich in fuel, since air enters it with difficulty through a heavily clogged air filter element. From this small guide, you were able to learn how to clean the carburetor and now you can proceed directly to performing adjustment procedures.

Tips for setting up, adjusting and troubleshooting Carburetor malfunction

• Incorrect cylinder pressure. On the “Nine” it should be 9.9 kg/cm2.
• Problems in the engine cooling system. This can also lead to increased friction, which, in turn, leads to excessive fuel consumption of up to 30%.
• The ignition timing was set incorrectly.
• There is a leak in one of the fuel system elements. This can also lead to overflow in the carburetor.
• Then there are problems with the chassis system. These are not completely disengaged wheels, overtightened wheel bearings, or lack of tire pressure.
• Incorrectly selected spark plugs and gaps between them.
• Malfunctions in the operation of the vacuum advance regulator.

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.