Washing the injector with your own hands - various methods. How to remove the ramp and check the VAZ-2107-20 injectors: tools and analysis of the nuances

The injector nozzle operates on the principle of a spray, dispensing the mixture into the working chamber of the engine. The duration of the injection cycle and the amount of fuel supplied are set in the program of the internal combustion engine control unit. For each of the injectors these parameters are the same. The fuel injector is located inside the intake manifold. The air flow passes through the manifold and carries the fuel particles ejected by the injector into the combustion chamber. The diagram of the “Seven” fuel system is shown in the picture below.

How to clean injectors on a VAZ 2107 injector at home

Comprehensive diagnostics of the operation of injectors on the ramp

For such a check, the fuel rail will need to be removed from the engine along with the injectors attached to it. After this, you need to connect all electrical contacts to the ramp and injectors if they were disconnected before removal. It is also necessary to return the negative terminal of the battery to its place.

The ramp must be placed in the engine compartment so that a measuring container with a scale can be placed under each of the injectors.
It is necessary to connect the fuel supply pipes to the ramp and additionally check the reliability of their fastening.
The next step is to turn on the ignition, after which you need to crank the engine a little with the starter. This operation is best performed with an assistant.
While an assistant rotates the engine, check the efficiency of all injectors. The fuel supply must be the same on all injectors.
The final step will be to turn off the ignition and check the fuel level in the containers. The specified level must be equal in each container.

In addition to self-checking, you can use the injector diagnostic service at a car service center. This operation is performed on a special testing stand. Testing an injector on a bench allows you to accurately determine not only the efficiency of fuel supply, but also the shape of the torch during fuel spraying.

Injector malfunctions - causes and characteristics

During operation, injectors more often than other components of the fuel supply system have to come into contact with aggressive environments. If the injectors on the “seven” are faulty, this can be determined by the following signs:

“Stalling” of the car when trying to move away;
Significant drop in power;
Extraneous noise and vibration during engine operation;
Excessive amount of exhaust gases released;
Change in fuel consumption;
Unstable “behavior” of the internal combustion engine at idle.

The deterioration in the functional state of the "Seven" injectors is primarily due to their contamination. Due to low-quality fuel, deposits appear on the walls of the injectors, reducing the throughput of the injection holes.

Injector purpose

Installing an injector in the VAZ 2107 made it possible to significantly improve engine performance. Changing the type of fuel system increases the amount of energy that is produced during the combustion of gasoline. Compared to a carburetor engine, a fuel injection system is more efficient in the initial stages, but over time its performance decreases. What does this depend on?

The injector plays the role of the final element in the fuel system of the car. The air mixture, together with a cloud of atomized gasoline, creates a huge amount of energy. Over time, this atomization may become less effective, the fuel jets will become weaker, and all due to low-quality gasoline.

The main cause of injector failure is poor fuel. Car fuel consists of many chemical components; in addition, various impurities are added to it, which should improve the overall performance of the engine. This factor cannot be ignored, since such gasoline leaves sediment on the walls of the fuel system. The thinnest channels are in the injectors, and it is these devices that suffer first. During operation, deposits from fuel only accumulate. What needs to be done to stop this?

3 Why can't I start the injector state?

The main function of this mechanism is to supply fuel to the pistons, and the efficiency of its operation depends only on the condition of the injector valves. If the channels and openings have long needed cleaning, they are clogged and overgrown with carbon deposits, then the supply of the combustible mixture will be difficult, or even stop altogether. This will result in unsatisfactory engine performance, which will affect not only its durability.

If you ignore the fact that it is time to clean the injector, fuel consumption will gradually increase, gradually increasing significantly. But this is not the only complication that threatens your savings on injector cleaning. If you allow them to become over-contaminated, you will have to replace them very soon, and this is much more expensive. So the wisest decision to save on this operation would be to do it yourself.

When to clean injectors

Cleaning of injectors on Lada cars is carried out according to the condition of the car. If there are no problems with your car, then there is no need to clean them. Also, to find out for sure whether the injectors need to be cleaned, you first need to diagnose the fuel system. You can learn more about how to diagnose the fuel system in our article.

The manufacturer recommends cleaning the injectors every 50,000 km. Since the fuel at our gas stations leaves much to be desired, just before this mileage they begin to become clogged and flushing them will be useful. You can wash it at a service station, or you can do it yourself. Next, we will look in detail at how to wash the injectors on a VAZ car at home.

Cleaning Frequency

Car manufacturers usually indicate in the technical documentation after how many kilometers the injector needs to be cleaned. But here it is worth noting that they do not take into account the peculiarities of car operation, or rather, the fact that the fuel that we sell at gas stations is not always of high quality. And such gasoline primarily affects the rate of clogging of the injectors.

Experienced mechanics have found that in our conditions, injector nozzles need to be cleaned approximately every 10 thousand kilometers. But this figure is conditional, since everything depends on the quality of the fuel being poured. Some may not need such an operation even after 15 thousand km, while others are forced to clean it after 5 thousand km. Therefore, it is better for the car owner to navigate the car itself, whose behavior itself will tell you that there are problems with the power system.

The main signs of clogged injector nozzles are:

“Dips” appeared when pressing the gas pedal;
The power plant functions intermittently;
Increased smoke when the engine is running;
Decrease in power and dynamics;

If all this is present, and the on-board computer does not show any errors, it is most likely that the injectors are clogged and require cleaning.

Self-check of injectors

Let's start with the fact that automobile injectors are divided into several types, of which two types have found widespread use at different times: mechanical injectors and electromagnetic (electromechanical) injectors.

Electromagnetic injectors are based on a special valve that opens and closes the injector to supply fuel under the influence of a control pulse from the engine ECU. Mechanical injectors open as a result of increased fuel pressure in the injector. Let us add that modern cars often have electromagnetic devices installed.

To check the injectors with your own hands without removing them from the car, you can use several methods. The simplest and most affordable way to quickly check injection nozzles without removing them from the car is to analyze the noise emitted by the engine during operation.

Symptoms of clogged injectors

Loss of dynamics is one of the main signs of clogged injectors. If they are contaminated, the car simply will not accelerate properly.

Unstable idling, the engine at idle will operate unstably and intermittently.

Starting difficulties can occur when there is contamination or when the injectors stop holding pressure. Fuel begins to drip into the cylinder, which can cause popping sounds in the exhaust pipe.

Ringing fingers are inevitable when the spray nozzle is clogged; this is due to the fact that the fuel entering the cylinder is mixed with air and the concentration of fuel in this mixture is quite small, so the engine experiences detonation.

Driving with dirty injectors will not provide any driving pleasure. And driving with such a problem is highly not recommended.

Causes and symptoms of malfunctions of the seven injection nozzles

Injectors are one of the most important parts of the fuel injection system. If it fails, which happens extremely rarely, the operation of the engine is disrupted. Most often, fuel injectors become clogged, which occurs due to contact with aggressive media. An aggressive environment is not only the fuel, but also the burned fuel assemblies. Before cleaning the injectors on a VAZ 2107, you need to determine by the signs that diagnostics of these particular parts is required:

At idle, unstable operation of the internal combustion engine is observed.
When trying to move away, the engine stalls.
Reduced power and agility.
When moving, jerks and dips occur.
Excessive amount of exhaust gases from the muffler.
Increased fuel consumption.
Extraneous sounds and noise are observed when the engine is running.

If these signs are detected, you will need to check the condition of the injectors. The reason for their clogging is low-quality gasoline, which causes deposits to form on the walls. If your car has a faulty or missing fuel filter, then the need to clean the fuel nozzles arises quite often.

After removal, you will need to check the devices, or rather their condition. How to check the injectors on the seven, we will figure it out in the next section. If diagnostics show that they are unsuitable for use, they will need to be replaced.

It is important! When purchasing, you need to know the article number of the device, which has the number 21110-1132010-82.

Device diagnostics

To make sure that the injectors need to be cleaned or replaced, you will need to first perform some diagnostic procedures:

Testing performance by ear. The principle of testing is that you need to start the engine and listen to the work. The presence of a ringing sound indicates that the fuel nozzles need to be cleaned.
The injector is checked with a multimeter. This method is more objective, as it allows you to obtain more accurate information. The principle of checking is that you need to disconnect the chip from the atomizer and connect the probes of the device to the contacts. The device is set to resistance measurement mode. If the resistance value fluctuates between 12-17 Ohms, then the device does not need to be cleaned.
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To make such a diagnosis, you will first need to remove the injectors from the car by disconnecting them from the fuel rail and cylinders. The test consists of installing the injectors on a special stand. The stand is used to pass fuel through nozzles under appropriate pressure. Based on the parameters of the resulting jet, the serviceability of the nozzles is assessed. If the fuel in the nozzles is sprayed unevenly, the device needs to be cleaned.

If, after diagnostics, it is determined on the injection seven that one or more injectors need cleaning, then it is necessary to resort to this procedure. Regardless of how many nozzles need cleaning, the procedure must be carried out for all four.

How to clean injectors with additives

If, during diagnostics using a multimeter, it was determined that one or more nozzles need cleaning, then the easiest way to do this is to use special chemicals. In this case, the injectors do not need to be removed from the car. However, this method is not appropriate in all cases. If the sprayers are in a neglected state, they will need to be removed and cleaned on a stand.

Washing of VAZ 2107 injectors is carried out on a special diagnostic stand. To carry out the procedure, you will need to remove all 4 sprayers from the car and install them on the stand. Special products are used as cleaning fluids. The disadvantage of this method is that its implementation will require an expensive stand. Such stands are available in car service centers, and the principle of washing nozzles is as follows:

All 4 sprayers are secured to the stand.
A cleaning liquid is poured into a special container; as a rule, it is a carburetor cleaner.
The program starts, and the stand automatically cleans the injectors for a certain time.

Troubleshooting

To quickly check the injectors without removing them, you will need an indicator screwdriver. It consists of a metal rod and handle on which a switch and a contact are located to create a conductive circuit, clamped by one of the fingers. When moving the switch forward towards the rod, the device becomes less sensitive; when moving to the upper position, its sensitivity increases. In the first case, the red indicator lamp will light up or flicker, in the second case, the green lamp will light up.

Before carrying out the test, the screwdriver switch must be moved forward, towards the working part (rod) until it stops, and your finger must be pressed against the open contact located on the handle of the indicator screwdriver. The hand must remain in this position during the entire test, closing the electrical circuit, otherwise there will be no indication.

The working rod of the screwdriver must be positioned so that it touches the metal bracket on the block holding the nozzle. There is an opinion that it is enough to simply bring the rod to the block for an indication to occur, but this is not so. The metal clamp catches the electromagnetic pulse generated during the operation of the injectors; a potential difference and alternating currents arise in it, which the device records.

This test checks the injector while the engine is running, so it must be started and left at idle. When the rod of the indicator screwdriver comes into contact with the metal bracket on the screwdriver, the red indicator should light up. This checks performance on all cylinders. If the injector of one of the cylinders is not working, the indicator will not light or blink.

Using the indicator does not necessarily indicate that the injector is faulty, it signals that it is not working. The problem may be there, or in the voltage supply system, poor contact, failure in the electronic control unit, etc.

Some models do not have metal pad clamps in which currents are generated; in this case, is it possible to determine the faulty injector without removing it from the engine? Yes, this can be done using the same indicator screwdriver. To do this, you need to set the switch in the uppermost position (this is the highest level of sensitivity of the device) and perform additional manipulations.

After starting the engine, the screwdriver rod is brought to the injector block, and no indication will appear, even if it is working. Therefore, you need to attach a metal bracket to the screwdriver shaft, which will serve as an antenna where electromagnetic oscillations will occur. A paper clip carefully pressed around the rod with pliers is suitable for this.

During the fuel injector test, the switch remains in the highest sensitivity up position. With the engine running at idle speed, you need to bring the bracket as close to the block as possible, it should cover it. A blinking indication should appear on the device due to currents excited by the electromagnetic field that occurs during operation of the nozzle. If there is a non-working injector under the column, there will be no indication. This technique is also suitable for pads equipped with a metal bracket.

Fuel rail of a VAZ 2107 car – removal – installation

We remove the fuel rail from the VAZ 2107 car to check or replace the injectors, as well as when removing the intake manifold pipeline. To check the injectors you will need an ohmmeter.

Removing the fuel rail and injectors from a VAZ 2107 car 1. We prepare the VAZ 2107 car for operations (see “Preparation of the VAZ 2107 car for maintenance and repair”). 2. On a VAZ 2107 car, we relieve the pressure in the engine power system (see “Relieving pressure in the power system of an injection engine”). 3. Disconnect the wire from the negative terminal of the battery (see “Battery VAZ 2107 - removal and installation”). 4. Having released the latch, disconnect the injector wiring harness block from the engine harness.

5. Using an ohmmeter, we check the resistance of the injector windings by connecting one probe to terminal E (“ground”) of the wire block, and the other - alternately to four terminals (F, G, B, C), measuring the resistance of each injector, which should be within 12 -14.5 Ohm. 6. Remove the receiver from the VAZ 2107 car engine (see “Receiver - removal and installation”). 7. Using a 17 mm wrench, unscrew the fitting of the fuel drain tube from the fuel rail, holding the hose tip with a wrench of the same size.

Repair of injectors VAZ 2114/2115

Repairing injectors involves carrying out a number of works at once:

replacement of rubber seals.

After the products have been removed from the fuel rail, you need to take a good look at each of the four nozzles. If there are visible signs of leakage on the body, repair will not be practical. You will have to immediately replace the nozzle with a new one. The differences in flushing and cleaning procedures for 8-valve and 16-valve engines are not significant. Therefore, you can be guided by the same scheme.

If the body is clean and there are no deformations or cracks on it, then repair work is allowed. To do this, you will need to remove the seal from the body and the sprayer. It is recommended to leave these parts in acetone or solvent for 1.5–2 hours. While the parts are being washed, you can use a vacuum cleaner to clean the fuel rail. Next, you need to carefully clean the place where the injectors fit into the ramp using a toothpick or a needle.

After this, you can start purging the nozzle from the inside. You will need a roll of electrical tape, an aerosol can for cleaning carburetors and a syringe. An aerosol cleaning liquid is supplied through a thin syringe into the nozzle cavity. It is better to wrap the joint between the syringe and the tube of the canister for sealing with electrical tape. It is recommended to repeat washing the nozzle from the inside three times. Afterwards the product must dry. As soon as the body itself, as well as the seal and sprayer dry after washing, you can assemble the nozzle and install it on the ramp.

A cheap product will perfectly remove dirt and deposits from the nozzle

Before installation, each nozzle is tested for resistance. The tester readings should be in the range of 11–15 ohms.

There is also a simple way to clean the injectors, without dismantling the fuel rail. However, it is only appropriate in cases where the injectors have not yet exhausted their entire service life (120–150 thousand kilometers). The use of cleaning additives in gasoline is allowed. In this case, all elements of the fuel system will be cleaned, but its closed nature does not allow removing dirt and sediment from low-quality gasoline.

The liquid is poured into the gas tank and, together with fuel, cleans all elements of the system

Replacing rubber rings and seals on injectors

Usually, when washing or repairing injectors, car enthusiasts immediately change all rubber elements. This is due to high wear rates. The cost of rings and seals is very low, but after replacement you can immediately observe the stability of the motor.

Rings and seals can be removed with one movement of the hand. However, installing new ones will require care, as it is easy to damage the rubber. The plastic element is first lubricated with gasoline, and then pulled in place of the old seal.

Spare parts for VAZ injectors can be purchased at a minimal price

Almost every driver can clean or replace the injectors on VAZ 2114/2115 cars on their own. Difficulties can arise only in the process of unscrewing the fuel rail or reconnecting the wires to the injector contacts. However, if each stage of work is carefully carried out, even a beginner can independently maintain this element of the fuel system.

Instructions: how to check the injectors without removing them from the engine and clean them if necessary

In the fuel system, they allow gasoline to be mixed with air. Thus, a flammable mixture is formed, which then ignites.

The injectors are:

• Electromagnetic - the valve monitors fuel access and regulates the atomization of the fuel mixture using the electronic engine control unit. There is a valve on the central distribution system in front of the throttle valve.

• Mechanical – they do not dose the fuel supply, but only allow it access under pressure.

The principle of operation of the nozzles: an electronic sensor analyzes the volume of air supplied under pressure.

The information received by the sensor enters the computer unit for further analysis (for example, engine temperature, air temperature).

After this, the computer calculates the size of the volume of air in the fuel mixture required to ensure that the output coefficient of performance (efficiency) from the operation of the engine is as high as possible.

Why and when to check injectors

If you decide to buy a used car, or your car has already driven about 100 thousand km, then you should check the performance of the injectors or replace them.

Remember! The performance of the engine directly depends on the operation of the injectors (they supply fuel to the system).

The injectors (their condition) are affected by the quality of the fuel consumed. If low quality fuel is regularly poured into the tank, the injectors will not last long. They will have to be changed sooner than after 100 thousand km.

Symptoms of faulty injectors can be noticed. He will tell you about them:
• Unstable engine operation at idle.
• Increased fuel consumption.
• The engine does not start well.
• Exhaust gases have become more toxic.
• The ignition skips at idle.
• The car accelerates worse (even though the gas is squeezed to the max).
• If you notice at least one of the above symptoms, you should check the injector nozzles.
To extend the life of the injectors, it is advisable to:
• Fill the tank only with high-quality fuel.
• Regularly add various additives to the tank (sold in auto chemical departments).
• Clean the injectors every 40 thousand km (because they get clogged).

We look for faults and make repairs

Before checking the injector nozzles, pay attention to the fuel filter (it must be clean), the gas tank and the fuel pump screen (they may be clogged and deposited). Similar inspections are required after 30 thousand km for preventive purposes. If everything is in order with this part of the fuel system, proceed to check the injectors.

You can stop by the service station, where there is a special stand. The liquid is supplied to the nozzles under pressure, and on the stand you will be able to see the operation of each sprayer (what spray dose it produces).

To diagnose injectors, use a multimeter or ohmmeter (these are devices for measuring resistance of injectors).

To determine the condition of the injector, you need to disconnect it from the high voltage wire. Now we check the injector with the device.

There are low and high impedance injectors (the manufacturer's instructions will tell you about the type of injector). The resistance should be 2-5/12-18 ohms.

You can also check the injector nozzle at home. You can do this in several ways:

Start the engine. Touch the working nozzle with your hand - it should pulsate. If the shaking is not felt, it means that the injector has failed. At idle, add speed and let the engine run a little. If you loosen the cap nuts that hold the injectors one by one, the engine speed will decrease. If the speed does not change, then the injector requires cleaning or replacement.

Diagnostic tool

Checking gasoline injectors yourself is possible if you have a diagnostic tool:

• On-board computer of the car (will help determine malfunctions in the engine control system).

• Pressure gauge (determines fuel pressure). Helps identify problems with the fuel pump pressure regulator and clogged fuel filters.

• LED for determining the polarity on the injectors (you can also determine the polarity on the ignition modules and coil).

If the ignition is turned on and one of the injector nozzles does not work, then check the presence of power to the injectors. To do this, you need to disconnect the wire block from the non-working injector. You need to attach the two ends of the wires to the battery, and touch the injector contacts with the other side of the wire. Now turn on the ignition.

Checking the windings

The nozzle on the injector requires immediate replacement if its resistance is higher or lower than 11-15 Ohms. This is determined using an ohmmeter.

How to check the resistance on the injector windings?

1. Remove the negative terminal from the battery.

2. Disconnect the block with wires from the injector.

3. Connect the ohmmeter leads to the electrical connector of the injector.

4. Compare the ohmmeter readings with the standard values (this is indicated in the manufacturer’s instructions).

Removing and washing injectors

In this article I will describe the process of removing injectors on a VAZ-2107 car. The owner complained about tripping and rough operation of the engine when running on gasoline. After diagnostics, it was discovered that the injectors were clogged. The car is additionally equipped with 2nd generation gas equipment, the so-called “cracker”. In this regard, the view in the photographs may differ slightly from yours (presence of a firecracker, injector emulator, etc.). In Fig. Figure 1 shows the appearance of the engine compartment of the vehicle being serviced.

Let's get started. We unscrew the clamps securing the air pipe using a Phillips screwdriver or a 7 mm socket.

We remove the pipe.

Remove the throttle cable clamp using a “flat” screwdriver, carefully prying it up.

Open the throttle valve and remove the throttle cable.

We unscrew the fastening of the throttle cable using a 10 mm “head”.

We unscrew the fuel lines with two 17 mm open-end wrenches. We unscrew the fastening of the tubes with a Phillips screwdriver.

Remove the vacuum hose from the fuel pressure regulator.

Remove the brake booster hose by unscrewing the clamp with a flat-head screwdriver.

We unscrew the two nuts securing the throttle assembly using a 13 mm “head”. We remove it, holding the washers on the studs, and move it to the side.

Unscrew the intake manifold mounting nuts using a 13 mm “head”. We remove the washers.

Removing the fuel line fasteners

Remove the intake manifold and put it aside.

Unscrew the fuel rail mounting bolts with a 5 mm hexagon.

Remove the injector harness connector by slightly pulling the lock towards you.

We take out the ramp along with the injectors. If the injectors fit tightly on the rings, then you can carefully pry off the ramp with a pry bar.

Remove the injector harness by pressing the latches on the connectors.

Remove the injector clamps by sliding them to the side along the fuel rail.

We take out the injectors. To do this, we stagger and pull them towards ourselves.

We see rust both in the injectors themselves and in the fuel rail. Somewhere a man was filled with gasoline and water.

If you are installing new injectors, you can skip the next few steps. Otherwise, wash the dirt on the injectors with a brush in gasoline. We wash them in an ultrasonic bath. We check injectors for performance and leakage in a test bench.

We install new sealing rings on the injectors, having first removed the old ones, prying them off with a screwdriver.

It is better to put a brown rubber ring on the bottom of the nozzle; it is more heat-resistant and will last much longer. If the condition of the old rings is good, then it is better to leave them, since the quality of the new ones leaves much to be desired.

If necessary, replace the injectors with new ones. You need to buy according to the number on the nozzle. In our case, Bosh 0 280 158 502.

We wash the fuel rail with gasoline or Abro carburetor cleaner and blow it with compressed air.

Before installing the injectors into the fuel rail, the rings on the injectors must be lubricated with something, for example WD-40. This helps to avoid damaging the rings during installation.

We install the injector clamps in place. Please note that the fourth injector is installed with the connector in the opposite direction.

We put on the injector harness. We install the nozzles in place, also lubricating the rings with WD-40.

Before disassembling, we noticed that the clapper and the throttle valve were very dirty.

Now is the time to wash the throttle assembly, idle air control (IAC) and gas firecracker.

Next, we collect everything in reverse order, but take into account some points. Don't forget to put the hose on the fuel pressure regulator.

We look at the condition of the throttle assembly gasket and, if necessary, replace it with a new one.

We install new sealing rings for the gas lines.

Be sure to change the fuel filter. For VAZ cars there are filters of the old (with “screws”) and new (with “snaps”) models. In our case, an old-style filter is installed.

To remove the fuel filter, first unscrew the fuel lines using a 17 mm open-end wrench, holding the filter housing with a 19 mm open-end wrench. Then unscrew the filter itself with a 10 mm head.

This is what came out of the filter in our case.

We install a new fuel filter and gas line O-rings. Do not forget to take into account the direction indicated by the arrow on the fuel filter housing.

We tighten the fuel lines without overdoing it and hold them, excluding cutting the fuel rings.

Let's check if we have any extra spare parts left ;). We start the engine and check for fuel leaks and air leaks.

Cleaning by removing injectors

Heavy contamination of the injection system is removed in a way that involves removing the injectors and cleaning them separately. This method allows you to achieve the best results. The main advantage of cleaning injection nozzles with liquid is the restoration of the performance of such injectors, which structurally have a complex configuration of their internal channels.

The injector is dismantled and each nozzle is individually cleaned on a special stand. This approach allows you to compare productivity, torch shape, spray direction and quality before and after cleaning. Additionally, you can compare and analyze the performance of the entire group of injectors together.

The principle of operation of the cleaning stand is that its control system simulates the operation of the injectors on the engine. Instead of gasoline, liquid is passed through them to flush the injectors. The stand operator controls the frequency of electrical oscillations of the nozzle valve. The main task is the occurrence of cavitation in the fuel supply channel. Cavitation refers to the formation of air bubbles in a liquid.

Hydrodynamic cavitation ensures the movement of the nozzle needle in the flow of cleaning liquid at high speed. A vacuum is created behind the various convex parts. Under the pressure of the surrounding liquid, the vacuum instantly divides into a large number of microscopic bubbles that “pop.” The effect of micro-explosions is obtained, and the energy from them affects the varnish and dirt deposits that have formed inside the fuel channel of the injector and on the needle itself.

The result of this operation is the effective destruction and removal of deposits and dirt in the nozzle channels, as well as the washing of the injector strainer. The operator determines the cavitation that has arisen visually. The stream of light liquid coming out of the nozzle turns brown. The color of the liquid at the outlet changes due to exfoliating slag.

The stand allows you to additionally identify changes in the operating parameters of the electrical and mechanical elements of the injectors. Thanks to this, you can make a decision in advance about the need to clean the injectors, the advisability of their continued use without flushing, or a complete replacement.

The injector performance indicator is determined both before and after cleaning. In cases where cleaned injectors show different performance indicators with a variation of more than 5%, then they need to be replaced. Faulty injectors are replaced either one at a time or in groups.

Flushing reveals that the solenoid valve is worn out and does not close completely. This means that such a nozzle flows at a time when no electrical impulse is applied to it. This malfunction leads to excessive fuel consumption, increasing carbon deposits on valves, pistons, etc. It is better to replace injectors with a similar problem immediately.

Cleaning the injector with ultrasound

One common way to clean injectors is to use a unit that cleans previously removed injectors in a special ultrasonic bath. This method provides good results, although some experts consider the best way to clean injectors using hydrodynamic cavitation.

An ultrasonic bath is an open container that is filled with cleaning liquid. From the outside, a device is mounted into the bottom of such a bath, which is an emitter of ultrasonic vibrations. The cleaning nozzle is lowered into the bath. While passing through the cleaning liquid, the ultrasonic wave starts the cavitation process. During cavitation, bubbles are formed, which burst and form shock waves. These waves have a destructive effect on the dirt and deposits that accumulate on the surface of the injector nozzle and in the channels.

Cleaning methods

To remove dirt and deposits from the injectors of the injection power system, two methods are used - ultrasonic and liquid.

The first method is based on the phenomenon of cavitation, in which ultrasound acting on a liquid leads to the formation of microbursts. The essence of such cleaning is that the nozzles are placed in baths with cleaning liquid, and then exposure to ultrasound is provided. This cleaning method is very effective, but the equipment for its implementation is expensive, so it is more suitable for service stations.

The liquid method does not require any special equipment, and it can be done in a garage, that is, you can wash the injectors yourself. The essence of the method is very simple - all contaminants are removed by washing with a cleaning liquid supplied under pressure.

How to convert a VAZ 2107 carburetor engine to an injection engine

Some owners of carburetor “classics” independently convert their cars to an injector. Naturally, such work requires a certain amount of experience in auto mechanics, and knowledge in the field of electrical engineering cannot be done here.

What will you need to buy

The kit for converting a carburetor fuel system to an injection system includes:

electronic control unit;
gas tank;
cylinder head (new or used from VAZ 21214);
receiver;
ramp with nozzles;
fuel pump assembly;
fuel filter;
fuel line with rubber hoses;
throttle assembly;
accelerator pedal with cable;
air filter assembly with sleeves;
front engine cover;
crankshaft pulley;
ignition module;
sensors for mass air flow, damper position, detonation, coolant temperature, oxygen concentration, crankshaft position, detonation;
high voltage wires;
harnesses, cables, wires, terminals, thermal casings;
brackets.

The cost of all these elements is about 30 thousand rubles. The electronic control unit alone costs approximately 5–7 thousand. But costs can be significantly reduced if you buy used parts rather than new ones.

Dismantling

Before replacing or cleaning the injectors, they will need to be removed from the fuel rail. To achieve this, the following activities are carried out:

Make sure the engine has cooled down properly. It is not safe to work on a hot engine;
Disconnect the power wires from the fuel pump to de-energize the device;
Try to reduce the pressure in the engine power system as much as possible. To do this, the engine starts, and then you need to wait until it stalls at idle speed;
Repeat this procedure several times until the car simply stops responding to turns of the ignition key;
That's it, now our goal is the fuel rail. To remove it, you must first remove the terminals from the battery, turn off the power to the ramp itself, disconnect the fuel supply hoses, and also disconnect all electrical appliances going to it. These are pressure, idle, throttle position sensors;
If you have an 8-valve engine, then you do not need to remove the receiver. This step is relevant for engines with 16 valves;
Experts do not recommend removing the intake manifold without dismantling the throttle valve and the hose going to it. It is better to unscrew and disconnect everything at once, which will allow you to continue working more conveniently;
Cover the exhaust manifold openings with something to protect them from foreign objects;
Using a hex wrench, you can unscrew a couple of bolts and remove the fuel rail along with the injectors;
Make sure that there are no distortions when removing the ramp, otherwise problems may arise with the dismantling processes;
We remove the injectors. To do this, remove the mounting brackets that hold the electrical connector. You also need to remove the bracket that holds the injector in its seat.

After dismantling the elements, be sure to close the seats to prevent debris and other objects from getting in, and place the nozzles themselves on a table or floor, after laying down a dry rag.

Here you can decide whether to change or clean the elements of the fuel system. If replacement is required, install new injectors in place of the old ones and follow the assembly procedure.

Cleaning

Here proceed as follows.

Remove the rubber rings from the injectors, and when cleaning is finished, replace them with new seals.
The cleaning process should begin with the nozzles, on which various deposits form as the car is used.
Be sure to thoroughly clean the funnel-shaped surfaces where tar deposits accumulate.
The next step is the fuel mixture supply channels.
To open the solenoid valve to supply fuel, you will have to trick the device with a 5-7 V power supply.
Some use stabilized voltage sources, phone chargers, or even a car battery. If using a battery, the voltage should be supplied through the light bulb. It will play the role of a current damper. Otherwise you risk burning the winding.
Electricity is supplied through two wires, in the gap of one of which a button is installed. It will close and open the network. This creates an imitation of the operation of an injector in an engine due to the influence of a pulsed electric charge.
You can supply the cleaning liquid to clean the injectors through a can of carburetor cleaner. Inexpensive and effective, even better than specialized chemicals.
Be sure to tightly connect the cylinder and nozzle with a rubber tube, clamps and any other means.
All is ready? You can then apply electricity to open the injector. At the same time, press the button on the cleaning agent canister.
Soon the torch of the liquid jet, which will exit through the fuel atomizer of the injector, will change its “clumsy” direction and will begin to uniformly exit the nozzle. This indicates that you have removed all carbon deposits.

Homemade cleaning device Before putting the cleaned nozzle back in place, check its actual condition.

Examination

To check you need:

Measure the injector resistance using a multimeter. If the readings are within 10-15 ohms, the injector is working;
If you deviate from these limits, cleaning is pointless. You only need to change the injectors;
Check devices for leaks;
To do this, when cleaning, do not turn on the electrical pulse so that the nozzle does not open;
Under pressure, a device with a broken seal will begin to show signs of leakage. Therefore, the element must be replaced.

Troubleshooting

Before removing the injectors on the VAZ 2107, you need to make sure that they are really clogged. There are several ways:

Hearing test: the old-fashioned method of diagnosis. Applicable only when the holes are significantly dirty. “Experienced” people recommend listening to the audio coming from the cylinder block. If muffled ringing sounds are clearly audible in the sound of the engine, then the fuel nozzles need to be cleaned;
Assessing the condition of injectors using a multimeter: a much more objective method of analysis compared to the previous one. First you need to know what type of sprayers is installed on the car. As a rule, the “seven” was equipped with high-resistance injectors. For correct diagnostics, it is necessary to disconnect the “high voltage” going to the injector. Now you need to connect the diagnostic wires of the device to the injector terminals. If the voltmeter readings give values in the range of 12-17 Ohms, then everything is in order with the injectors;
Diagnostics of the mechanical parameters of the sprayer. This diagnostic operation is only available with professional equipment; it is performed only at specialized service stations. The point is that the injectors are dismantled and attached to a stand. Large quantities of fuel are continuously passed through the part. The technician evaluates the parameters of the torch that is formed when fuel passes through the nozzle. If the fuel flows unevenly, then the device is clogged.

Things to take note

To repair the fuel system yourself on a VAZ, you will need to remove the receiver.

This is carried out in several stages:

First, remove the throttle controls from the receiver, then loosen the retaining clamp and disconnect the vacuum hose.
The fuel pipe holder is being dismantled.
The bracket-clamp of the throttle drive cable is removed.
The 5 fastening nuts are twisted and the pressure adjustment hose is disconnected. After this you will be able to remove the receiver from the studs.

This is the only way to gain access to the fuel rail.

When cleaning injector nozzles may be useless

Routine washing of the injector and injectors without removing it yourself or at a service center should be carried out every 10-20 thousand kilometers. If you clean the injectors after a longer distance, there is a risk that this procedure will no longer be useful.

Such neglect can ultimately lead to severe damage not only to this part, but also to other interconnected engine components. In this case, simply cleaning the injector will not get rid of it; the engine will need repair.

Buying new components, including injectors, is labor-intensive and not cheap. Therefore, cleaning the injector should not be put on hold, especially in cases where signs of a malfunction have already appeared.

But the best option is to prevent the problem from occurring by cleaning the injectors from time to time without removing them, for example, before changing the engine oil. Such prevention will help protect your car from unnecessary problems with engine injectors.

Pollution prevention

In order for the injectors to retain their original working condition longer, it is necessary to regularly refuel with normal fuel. Good gasoline will not cause black deposits to appear on the surface of the nozzle, as a result of which it will supply fuel longer in the form of mist rather than droplets.

Every 15-20 thousand kilometers, fill a full tank of gasoline and add a small amount of acetone to it, following the algorithm specified earlier. Burn the fuel completely. The engine will run better than before. But don’t get carried away, because increasing the octane number negatively affects the overall condition of the engine.

How to clean injectors

There are many different methods for cleaning injectors. The use of a specific option will depend on the degree of contamination of the holes. For preventive cleaning or removing light blockages, special chemicals can be used, the use of which does not require removing the injectors.

Cleaning injectors with additives

This method makes it possible to clean not only the injectors, but also the fuel system in general. However, this method is effective only with the systematic use of cleaning chemicals.

It is worth noting that additives must be used every 17,000-20,000 kilometers. To clean, the fuel injection line must be connected to a reservoir through which the cleaning agent is transferred under pressure, and the standard fuel pump must be turned off.

The engine must be started and should be idling for the next fifteen minutes. Then you need to turn off the engine and wait about fifteen minutes.

After this, the engine should be started again, but this time the speed should be increased to the maximum speed to remove sludge fragments. In this mode, the internal combustion engine should run for about thirty minutes.

Manual cleaning

If we are talking about an advanced case, when cleaning with additives is virtually meaningless, it is necessary to dismantle and subsequently replace the injectors.

To clean the injectors manually you will need:

Clean rags;
Can of cleaner;
Syringe 5-7 ml;
Set of spanners;
Screwdriver set.

In order for the event to be a success, you must adhere to the following algorithm:

Dismantling the clamps securing the air pipe and its subsequent removal;
Dismantling the throttle cable locking mechanism;
Removing the accelerator cable and its bracket;
Dismantling fuel lines and pipe fasteners;
Removing the vacuum brake booster hose;
Dismantling the fuel line brackets;
Removing the intake manifold brackets;
Removing the fuel rail mounting bolts;
Loosening of the injector mounting harness;
Removing injectors with fuel rail.

Cleaning should be carried out according to the instructions on the packaging of the chemical product.

How to determine that injectors need to be cleaned

Fuel injectors are an important part of the injector. With their help, gasoline is sprayed into the combustion chambers. There is a misconception that parts become dirty due to bad gasoline, which contains sand and various harmful additives. But in fact, the gasoline supply system to the internal combustion engine is equipped with filters that clean gasoline from various contaminants.

Clogging of the injector does not occur immediately, only during operation of the machine. The main version of contamination is that heavy fuel components are deposited on the walls of the injectors. This happens mainly after turning off the car, when the heat rises at the base of the injectors.

Sources

https://ServizNaBis.ru/rul/forsunki-vaz-2107-inzhektor.html
https://TeamsPro.ru/transmissiya/zamena-forsunok-vaz-2107-inzhektor.html

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Why do injectors clog?

Impurities in the fuel, short trips and difficult operating conditions lead to carbon deposits forming on the needle and internal surfaces of the injector. This plaque clogs the channels. The solenoid valve opens for a long time and more gasoline enters the combustion chamber than necessary.

All this leads to an over-enrichment of the fuel mixture, poor ignition and misfires. Unburnt gasoline enters the exhaust system and burns out inside the catalyst, which becomes clogged and melts at high temperatures. At the same time, engine power decreases, detonation appears, and fuel consumption and exhaust toxicity increase.