How to check injectors on a VAZ 2114 - signs of malfunction, 4 diagnostic methods

Every car owner of an injection car sooner or later encounters problems in the fuel system and begins to think about cleaning the fuel injectors. The task of the injector is to maintain the pressure created by the fuel pump and only at the right moment to open for a fraction of a second to allow the required amount of fuel to pass through. There are a lot of different additives in the fuel, which during engine operation stick to the seat of the injector locking needle. As a result, the injector begins to spray fuel incorrectly or leak fuel when it should be closed. In such cases, it is necessary to clean the injectors or replace them. The recommended period for cleaning injectors is 25,000 km - 30,000 km. Failure to properly maintain fuel injectors can lead to their complete failure, and then only replacement will be necessary.

How to understand when it is necessary to clean fuel injectors

• Loss of dynamics during car acceleration.
• When you press the gas there are jerks and dips while driving.
• The engine is running rough and unstable.
• Fuel consumption has increased.
• It takes a long time to start the engine with the fuel pump running.
• Black smoke from the exhaust pipe.

There are many instructions and methods for cleaning fuel injectors on the Internet, but we recommend using the most reliable and proven one - cleaning in an ultrasonic stand.

Symptoms of a problem

With proper care, the injectors on the VAZ 2110 can last quite a long time. But when the first signs of malfunction appear, it is recommended to immediately clean the elements. What are the symptoms?

• The engine starts with certain difficulties;
• Fuel consumption increases;
• Power and thrust drop;
• In winter, the car sometimes jerks;
• The engine starts to stall, etc.

If you notice at least one of the symptoms, be sure to check the injectors and decide whether to clean or replace.

How to remove and clean

• Turn off the fuel supply from the fuel rail.
• Disconnect the electrical connector for the fuel injectors.
• We unscrew the two bolts securing the ramp and pull it out.
• We remove the injectors from the ramp and install them in a special stand
• After cleaning, put everything back together in reverse order.

Further in our photo report there are more detailed instructions.

1We begin to remove the fuel injectors for further cleaning. The injectors are located behind the intake manifold.

2First of all, we need to relieve the fuel pressure from the fuel rail. To do this, unscrew the plastic cap indicated by the arrow in the photo.

3And use something sharp to press on the spool valve, first placing a container so as not to pour gasoline all over it.

4Having released the pressure, screw the plastic cap back on and unscrew the 5mm hexagon bolt securing the fuel rail.

5On the other side of the manifold, between the third and fourth injectors, there is another fuel rail mounting bolt.

6It is convenient to unscrew it using a small ratchet with extensions and a 5mm cue ball.

7Under the air filter bellows we need to disconnect the fuel supply hose to the ramp using two 17mm wrenches. And disconnect the electrical connector of the fuel injector wires.

8Now that everything is turned off, lift up the fuel rail with the injectors, pulling them out of their seat in the manifold.

9And we pull out the ramp with injectors and wires towards the right wing of the car.

10Located on the table, disconnect the electrical connectors from the fuel injectors by pressing the metal brackets on the sides of the connectors.

11Pull out the metal clamps of the injectors. They can be removed by hand, but if difficulties arise, you can use a screwdriver.

12We remove the injectors from the ramp and clean them of dirt, preparing them for installation in the stand.

13In a special stand for cleaning injectors, we create WYNN'S liquid pressure and make sure that the injectors do not allow liquid to pass through themselves. Then we turn on the intermittent opening of the nozzles and look at their spray. The liquid is sprayed filling the container in the stand.

14After cleaning the nozzles by passing liquid through them, we lower the nozzles into a container with WYNN'S liquid and turn on the ultrasonic cleaning mode, setting the timer for 30 minutes.

15After cleaning, replace the injector O-rings, if necessary, and install them back into the fuel rail. We recommend lubricating the O-rings with silicone grease before installation to avoid damaging them during assembly.

16It is also necessary to lubricate the rubber bands of the injectors on the installation side of the manifold.

17Here are all the tools needed to remove and install fuel injectors.

18The work is finished. Before starting the engine for the first time, you must turn the ignition on and off several times to fill the fuel rail with gasoline.

The VAZ 2114 (2115) is equipped with engines of 1.5 and 1.6 liters (8 and 16 valves), therefore the performance of the injectors must be selected depending on the type of engine.
If you make the wrong choice, fuel consumption may increase or the internal combustion engine may lose power. The VAZ 2115 injector is no different from the VAZ 2114, so when considering the device of the “fourteenth” model, we will also keep in mind the “15th”. Model 2114 can be equipped with fuel injectors from different manufacturers, and accordingly, the cost of the injectors may also differ. Manufacturers and cost (price range in the Russian Federation): • GM (1300 - 1400 rubles), • BOSCH (1000 - 1200 rubles), • SIEMENS (800 - 1400 rubles). Which injectors should I choose for replacement?
Here you should focus on the part markings.
For example, BOSCH 0 280 158 502 is only suitable for a 1.5 l 8-valve engine. It’s hard to say anything about the manufacturer; the quality of all products is approximately the same. . It is necessary to remove the pipe from the air filter. Remove the terminals from the battery. . We take some kind of container for draining gasoline. . We take a screwdriver and a container, approach the car, unscrew the cap from the valve on the fuel rail (TR), prying the valve nipple with a screwdriver, release the pressure (gasoline will flow from the FR), then screw the cap back on. . Next, we take the keys for 24 and 21 or 22 (so for a square TR, for a round one there are most likely two keys for 24, I don’t know for sure) and try to unscrew the tube that goes to the TR under the throttle pipe on the driver’s side and try to pull it out of the ramp. . Then he unscrews the fuel pressure regulator (FPR) with a ratchet or just a 6-point 5-pointer, we also try to pull it out of the TP, to do this we carefully pull up so as not to tear the white hose that goes from the RTD to the receiver. . We disconnect the chip, impulses pass through it to the injectors. . We unscrew the fuel rail (FR) itself with a ratchet or just a 6-point 5. We pull it towards the receiver, then, when the injectors come out, we turn the FR with the injectors up and carefully pull it out towards the right wing, everything came out and went back in without any problems! . We remove the wiring from the injectors, here you need a screwdriver, press your finger on the spring (U-shaped piece of iron). We try to push it upward with a screwdriver (towards the wires coming out of the injector). Next, we move the spring forward, one end should come out, the other will remain in place, pull the chip up, i.e. remove from the nozzle. . Now you need to remove the clamps from the injectors; to do this, use a screwdriver to pry them off on both sides. Then we try to pull them out with our hands or a screwdriver (whichever is more convenient) and pull them to the side. Then we pull the injector up, if there are rings left in the ramp, as I had, then we take them out with a screwdriver, they come out easily, don’t forget about the ring on the RTD, it’s better to change it in advance, I didn’t buy rings on the RTD, I left the old one. . Everything was removed. In fact, there are quite a lot of reasons why injectors may not work well. And the most common symptoms are described below: • Difficulty starting the engine in any weather; • The engine is running unsteadily; • The engine stalls at idle; • High crankshaft rotation speed at idle speed; • Loss of power, poor response to the accelerator pedal; • When you press the gas, shocks or dips may appear; • High gasoline consumption; • If the nozzle is dirty or damaged, it should be replaced or cleaned. There is no point in repairing it. It should also be noted that today injectors cannot last even 100 thousand km. The VAZ-2114 model can be equipped with different injectors from different manufacturers. Depending on this, durability and their cost also differ. It is recommended to buy not domestic parts, but from other companies, for example, GM, BOSCH, SIEMENS
.
Also, the choice of injectors also depends on the working volume and the number of valves. For 16-valve engines, the performance of such parts will be different than for the 8-valve version. If the parts are selected incorrectly, then most likely, gas mileage will be higher or the car will lose power. If we talk about choice, then preference should be given to the BOSCH brand at number 0280158502
. This is the serial number that is suitable for an 8-valve engine with a volume of 1.5 liters. Injectors fail not only because of their quality; their performance is largely affected by fuel that contains a lot of dirt or large fractions. Cleaning injectors at service stations will not be cheap. Therefore, if you do not check and clean it yourself, then you should think about whether it might be easier to buy new parts and replace them.

Injectors are an indispensable attribute of any car fuel system based on injection type engines. The injectors act as gasoline atomizers and determine the required amount of fuel to be supplied to the combustion chamber. However, during operation there is a gradual depletion of the injectors. To optimize the operation of the entire system and increase engine power, it is recommended to periodically clean and flush the injectors.

What injectors are installed on VAZ 2114/2115 cars

Almost all types of injectors that the VAZ 2114/2115 are equipped with at the factory can be considered interchangeable. Depending on the year of manufacture, injectors manufactured by Bosch and Siemens of different markings were installed on the car. Bosch injectors:

1. Model 0280 158 022. The product is compatible only with a 16-valve engine with a volume of 1.6 liters.

   The nozzle is black and is designed to operate at an optimal pressure of 3.8 atmospheres.

2. Model 0280 158 017. An injector with this marking is installed on 8-valve engines with a volume of 1.6 liters. The body is also black.
3. Modification 0280 158 996 is considered obsolete, since injectors with this marking were installed on cars until 2006. The model was intended for 8-valve power units.

Standard equipment for VAZ 2114/2115 injection engines Siemens injectors:

1. VAZ20734 is made in an orange case. The model can be installed on a VAZ 2114/2115 of any year of manufacture, but the modification is paired with an 8-valve engine.
2. Model VAZ20735 is intended for a 16-valve engine. In terms of its characteristics, it is practically no different from the previous model. The nozzle has a blue marking.

Depending on the marking, it can be used on different types of engines.

Replacing injectors

The difficulty in identifying problems in the operation of injectors is that the fuel system is quite branched and it is necessary to diagnose the functionality of all its parts. For example, a malfunction such as a decrease in engine power can have two reasons - failure of the injectors or exhaustion of the pump's life.

Clogged injectors can result in sudden jerking of the engine while driving or unstable idle speed. In addition, an increase in fuel consumption can be considered a sign of injector failure.

You can check the functionality of each injector even without removing them. Simply start the engine and remove the wires from the connector of each injector one by one. If immediately after removal the engine starts to twitch or stalls, then the injector is fine. If the stability of the engine does not change with removal of the wire, then the injector needs to be thoroughly cleaned or even replaced.

This material will help you to independently replace or wash the injectors on VAZ 2110-2112 cars: https://vazweb.ru/desyatka/pitanie/zamena-forsunok-vaz-2110-8-klapanov.html

Recommendations and tips

An indicator of normal operation of the nozzle is a high-quality spray of liquid. Also, after washing the injectors, it is recommended to replace the fuel filters; if necessary, the fuel pump mesh filter is additionally cleaned. This is necessary to prevent dirt from the fuel system from re-clogging the injectors.

We also recommend reading the article on how to clean injectors with ultrasound. From this article you will learn about the advantages and disadvantages of this method, as well as the features of such cleaning.

Please note that the cleaning method by washing only removes surface deposits. If the injectors on a 2114 or VAZ 2115 have persistent and heavy contamination, it is necessary to perform deep cleaning of the injectors with ultrasound or washing on a bench. In difficult cases, ultrasonic cleaning of injectors is combined with washing to obtain better results.

How to remove

The procedure for dismantling and installing injectors is not particularly difficult, but it does take a lot of time. You need to prepare a set of tools in advance:

• 2 open-end wrenches for 17;
• crosshead screwdriver;
• screwdriver with a flat thin blade;
• hex key 5.

None To relieve fuel pressure, you must turn off the fuel pump. It is located in VAZ 2114/2115 cars in the fuel tank. The easiest way to get to the pump is through the hatch located under the rear seat cushion. For this:

1. The seat needs to be reclined.
2. Find a small hatch under the rug.
3. Unscrew the screws securing the hatch.
4. Remove the cover and remove the contact block from the fuel pump housing.

Then you need to start the engine. The engine will run on the amount of fuel that remains in the system, since the pump will not build up pressure after removing the block. You must wait until the engine has completely used up the remaining gasoline and stalls.

None The procedure for removing injectors is as follows:

1. Open the hood of the car and remove the wire from the negative terminal on the battery.
2. For ease of dismantling, it is recommended to remove the air filter box. It will prevent free access to the engine.
3. After that, use your finger to snap off the plastic retainer on the engine and disconnect the connector from the throttle valve.
4. The connector from the idle air control regulator is removed in the same way.
5. Next, you need to disconnect the connector block from the wiring harness of the injectors themselves.
6. The injectors can only be removed together with the fuel rail. Therefore, you need to unscrew the bolts securing the ramp to the body.
7. After which it will be possible to move the ramp to the side so that each of the nozzles moves slightly out of the mounting socket. The wires are removed from the injectors, otherwise it will be impossible to pull out the ramp.
8. The ramp is pulled out and placed in a clean place. Now you can easily remove all the injectors - they are pressed out using a plastic clamp.

Disconnecting the injectors is possible only after dismantling the ramp itself. Accordingly, new products are inserted in place of the old ones. And then the installation work is carried out in the reverse order.

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.

1. Remove the rubber rings from the injectors, and when cleaning is finished, replace them with new seals.
2. The cleaning process should begin with the nozzles, on which various deposits form as the car is used.
3. Be sure to thoroughly clean the funnel-shaped surfaces where tar deposits accumulate.
4. The next step is the fuel mixture supply channels.
5. To open the solenoid valve to supply fuel, you will have to trick the device with a 5-7 V power supply.
6. 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.
7. 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.
8. You can supply the cleaning liquid to clean the injectors through a can of carburetor cleaner. Inexpensive and effective, even better than specialized chemicals.
9. Be sure to tightly connect the cylinder and nozzle with a rubber tube, clamps and any other means.
10. All is ready? You can then apply electricity to open the injector. At the same time, press the button on the cleaning agent canister.
11. 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.

Repair of injectors VAZ 2114/2115

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

• cleaning;
• purging;
• 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.

Video: the easiest way

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.

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.

A broken fuel pump can cause serious problems. You can read more about this here: https://vazweb.ru/desyatka/pitanie/zamena-toplivnogo-nasosa-vaz-2114.html

The liquid is poured into the gas tank and, together with the 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.

• Author: Veniamin
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Before moving on to the procedure for removing injectors, I recommend that you first become familiar with what INJECTORS are and what functions they perform in the power supply system of an engine with distributed injection. You can read about this in detail on the website in the article Fuel injectors.

Features of fuel injection systems

The advantages of fuel injection systems (FIS) include:

• constant pressure level in the fuel system;
• high-quality atomization of the fuel mixture;
• rapid injection of a combustible mixture;
• reduction of noise when the motor is running;
• complete independence of the complex from engine operating modes;
• possibility of implementing several injections simultaneously;
• reduction of exhaust gas toxicity;
• reduction of emissions of solid pollutants into the environment;
• reduction in fuel consumption;
• noticeable increase in productivity.

Design and principle of operation of fuel injection systems

The main element of the fuel system is the pump, which creates and maintains the required fuel pressure. There are various designs of pumps, but the principle of their operation is the same.

The main element of the fuel system is the fuel pump

The vehicle itself consists of the following components:

• fuel lines;
• fuel tank;
• fuel filters;
• fuel pump (FP);
• fuel rail (TR);
• nozzles (injectors) for each engine cylinder;
• fuel pressure sensor located on the ramp;
• a control unit that regulates the pressure and volume of fuel for maximum efficient operation.

The fuel system of VAZ 2114/15 cars is designed quite simply

Correct operation of the fuel complex allows:

• reduce the temperature of the coolant in the system;
• reduce the load on the fuel pump;
• significantly reduce emissions.

Pressure limiter device

The fuel pressure in the system can be adjusted in two ways - mechanical and electronic.

The mechanical limiter consists of a special plunger with a spring installed in the fuel line. If there is excess pressure, excess fuel is discharged back into the tank through the valve.

The electronic limiter is a more modern device. Electronics allows you to bring fuel pressure to operating values ​​much faster. This significantly increases the efficiency of the vehicle.

Injection nozzles

A modern injection engine uses electromagnetic or electronically controlled injectors. They work like this:

1. From the fuel rail, fuel is supplied under pressure to the injector.
2. The fuel enters the cavity, which acts as a spray nozzle.
3. At the command of the electronic control unit (ECU), the valve in the injector opens.
4. Fuel enters the injector nozzle.
5. Fuel is atomized and dosed into the engine cylinder.

This process is measured in milliseconds. Since the operation of the fuel system is regulated by the computer, when repairing and replacing injectors, you should carefully follow the algorithm regulated by the car manufacturer.

When replacing, original injectors or analogues specified in the vehicle’s operating instructions must be used. Otherwise, substandard injectors can lead to failure of other engine components.