Advice 1: How to check injector diesel

The simplicity and reliability of the dieseltion engine can be operation for quite a long time without disturbing the owner of the violation of the regulations in the fuel system, which consists of: the transfer pump low pressure fuel high pressure pump and injectors. The last components of the fuel injection system are the weakest link in the chain. And no wonder, after all the nozzles have the greatest load during operation of the motor.
How to check injector diesel
You will need
  • - electronic scanner,
  • - stand for testing and adjusting of fuel equipment.
Diesel engines of old were equipped with a fuel high-pressure pump (injection pump), in which the number of sections is directly dependent on the number of cylinders in the engine. Each section of fuel injection pump provided fuel injector of a specific cylinder.
With the introduction of electronic control injection system, new engine (CDI) were equipped with motor-jets, the opening of the atomizer which is a command processor. So the masters no longer need to install the ignition timing and the engine became much easier to maintain.
Symptoms that indicate disturbances in the fuel supply system, is the emergence of black smoke in the exhaust. Increased smoke is a result of incomplete combustion of the fuel mixture supplied to the cylinder injector.
To proceed with the repair after the first of such signs, in any case impossible. Therefore, in the shortest possible time, the vehicle needs to visit the dealership and have diagnostics. During scanning the service engineer will identify the problem using the tester.
If the failure occurred in the electrical part of the motor-injector, which changes the stepper motor. But in those cases when the electronic components operate normally and smoothly, all injectors removed from the engine and delivered to the repair of the fuel equipment, which will check on booth mechanical part and, in case of detection of faulty nozzles, replace them.
From now on, the motorist should replace the fuel and air filters, and the car will be able to overcome more than one hundred thousand kilometers without repair.

Advice 2: How to check the injectors VAZ 2110

The loss of engine power, deterioration of other performance can be caused by a variety of reasons, including contamination of the injector plays a role. But to know for sure, need to check the fuel system components.
How to check the injectors VAZ 2110
The consequences of contamination of the nozzles can be expressed in increased fuel consumption, power failures at the sharp pressing on the gas pedal, the instability of engine operation at idle. Another indirect sign is increased frequency of rotation of the crankshaft at idle and hard starting. All of the above shortcomings indicate that there is a sense inspect the injectors. This can be done directly on the engine.


Disconnect the negative terminal from the battery; for the convenience of further work will have to remove the air filter. To do this, the bottom with a screwdriver (or your finger) press the plastic latch and disconnect wire connector from the mass air flow sensor.

Next, loosen the clamp, located on the tube connecting the filter housing and intake pipe. From the crossmember of the radiator frame on the bottom with your fingers, squeeze a pair of rubber supports under the filter. You can now lift the front of the filter to squeeze out of the hole the rear bearing and remove the entire housing.

When the filter is removed, you can disconnect the hose from the fuel pressure regulator. Next, press the plastic latch throttle to disconnect the wired pad. Similarly, disconnect the connector from the IAC valve. Disconnect the connector from the injector common wire harness.

Check the injectors on ВАЗ2110

Now you need to screw the bolts securing the rail and the screws that secure the holder to the fuel tubes. Then gently slide to the side rail and pull it with the injectors. Pre-prepare a small transparent container (for example, trim the plastic bottles) that need to be hung directly on the rail, one under each nozzle. A further stage of checking the quality of fuel atomization. Connect the negative terminal on the battery and have an assistant spin the starter.

Watch the process of spraying: should be a right cone, the volume of fuel in all 4 tanks should be the same. If any atomizer does not meet these conditions, it must be replaced. When ignition off, inspect the nozzle: the flow of fuel to the dispensers also have defective parts. One of the reasons of failure – violation of the integrity of the winding. To check this, use the ohmmeter. The meter should show a resistance of 11-15 Ohms. If not, the part needs to be replaced.

Advice 3: How to check glow plug of a diesel engine

Glow plugs are used in diesel engines to launch in low temperatures. Checking spark can be performed in two ways: visual and with a closure of the electric circuit. Broken candle needs to be replaced.
There are 2 ways to check the glow plug
The working process of diesel automobile engine has some specific features that determine the nature of his work at low temperatures. These features are manifested in the deterioration of fuel atomization, the viscosity of which increases as a result of lower temperature. To ensure a start in cold season of the modern diesel engines are equipped with glow plugs. Candles carry out a preliminary heating of the air inside the cylinder, which enables engine starting at low ambient temperatures.

To ensure trouble-free operation of the diesel engine in the winter suggests a regular check of the glow plugs. Testing candles is a standard procedure in the comprehensive health check of diesel engine carried out by the specialists of the service stations of cars. In the presence of certain knowledge and skills, check the glow plug, the car owner can perform on their own.

Test a glow plug of a diesel engine can be performed in two ways – test voltage a closed circuit and a visual method.

Check voltage

As a tool to control the use of a voltmeter or an ohmmeter. In the absence of the instrument testing can be performed using led lamp, one lead wire which is connected with the positive pole of the battery and the other is in turn connected to each of the candles.

Check visual method

Before checking turned the nozzle of one of the cylinders, so that the resulting hole could be seen the glow plug. This method involves two people. One reviewer from the driver's seat turns the key in the ignition, while the other observed the behavior of the glow plugs. If the candle is serviceable, it should glow red hot.

This method is not applicable to all models of cars, as in some engines, the spark is not visible through the hole of the nozzle. In this case you should use the first method.

If the candle is difficult to eversion, the place of its planting, gently soak with kerosene or solvent. After the end of the test should be installed, pre-lubricated the threads with grease. If during testing will be identified inefficient candles, they must be replaced.

Advice 4: The device and principle of work of injector

Almost all modern cars are fuel injected. This means that the fuel injected in the engine has one of the most important elements of the engine nozzle.
The device and principle of work of injector
The purpose of the injector (or injector) in the engine is dosing fuel, its atomization, the formation of a mixture of air and gasoline (or diesel fuel). Modern engines are equipped with injectorswith electronic control fuel injection. There are 3 types of injectors, different methods of injection.


Injectors with electromagnetic action method is equipped with petrol engines, including engines with direct injection. Nozzle design is simple; that is, a nozzle, an electromagnetic valve connected to the needle. The work of the atomizer is in accordance with the work control block. At a certain time, the voltage on the valve - occurring electromagnetic field, overcoming resistance of a spring, pulls the needle, freeing the nozzle. The result is a gasoline injection. When the electronic control unit stops applying the voltage, the electromagnetic field disappears, the needle returns to the original place, thanks to the elasticity of the spring.


Works in conjunction with diesel engines. Construction includes draining, the intake throttle chamber control valve (solenoid). The essence of the work lies in the application of pressure. When submitting a block of a corresponding voltage to the valve, immediately open the drain throttle - diesel fuel goes in the trunk.

The task of the intake throttle – preventing equalization of pressure, the control chamber. As a result, the piston pressure is reduced, but the needle on the fuel pressure still, because of what she is lifted and fuel is injected. When the electronic control unit de-energizes the valve needle of the injector is pressed against the seat by the force of pressure of diesel fuel on the piston in the control chamber. Injection does not occur, because the fuel pressure on the needle smaller than the plunger.


Is considered most advanced and is installed on diesels. Its main advantage is high response speed (more than solenoid injectors 4 times). The consequence of this is the several opportunities to perform fuel injection for only one cycle, plus the exact dosage. The design of the piezo injector includes a switching valve, a needle, a piezoelectric element, a pusher.

The principle of operation of this injector is also based on hydraulics. Starting position: the needle is located on the saddle because of the higher fuel pressure. When the piezo voltage falls, its length increases, due to which is passed the force on the pushrod. Due to this, the switching valve opens, fuel goes in the trunk. Further rises and the needle is injected.

Advice 5: How to choose diesel

Japanese cars with diesel engine delight their owners good performance, fuel efficiency, reliability and ease of repair when operating in the conditions of Russian roads. To get all these advantages buying diesel, it is important, adhering to the simple rules, make the right choice.
How to choose diesel
Buying a diesel car from a stranger, put the engine a thorough check. Make sure that when you run the engine was cold. Serviceable diesel plants with a twist. Please note that the cold he emits a pretty noticeable noise. Then start the engine is warmed up, the noise should significantly subside. If in this state it won't start immediately, but only after 3 to 9 attempts, so worn rings, piston.
Check whether belching from the exhaust smoke when you press down on the accelerator when the engine is warm. If a cloud of dark smoke, it is likely, wear has undergone a oil ring or a faulty injector. White smoke indicates fuel getting into the water. Put under the exhaust a sheet of paper. If it appeared soot, so the fuel is not burned completely.
The sound of the engine should be soft, uniform, no knocks. Reverse the evidence of irregularities in the operation of the valves. Try to recognise the noises in the set and reset speed, to determine the operation of the crankshaft and piston. Open the oil cap. Indication of what is happening somewhere blowby are the oil spray from the oil fill neck.
Look under the hood. Determine the integrity of the cylinder block and nuts to the injectors. Traces of white or red sealant instead of black indicate that the engine's been opened. All the bolts that fix the auxiliary devices must be in place.
To assess the condition of the ear, run the car, switch off and then switch on the ignition. Light oil pressure switch should light up in 2-3 seconds, but not before.
If the results of all these actions, you are not disappointed and you are ready to become the owner of a diesel engine, measure the compression and crankcase pressure, check injectors, cooling system.

Advice 6: How to choose a diesel car

Buying a diesel car for the uninitiated – it is complex, dark and obscure. Therefore, you should know how to choose a diesel car, to avoid disappointment from buying.
How to choose a diesel car
You will need
  • Level meter compression gauge pressure of the crankcase gases and other equipment for engine diagnostics.
You should first check how the engine starts in a cold condition. This is best done in the morning, so engine was cold. Serviceable diesel will start with a half-turn. If not start immediately - this is a bad sign (wear or piston rings). The cold will be significantly noisy, warm – much quieter. If you have a hot engine, on many models the heating of engage will not, and the start will occur due to the compression.
When you press on the gas pedal to warm the engine, check to see whether the smoke belching from the exhaust pipe. If the smoke is dark, so there is a wear oil ring problems or injector. White smoke means water in the fuel. Commonly used method: a white handkerchief or sheet of paper put under the exhaust. The presence of soot on the paper or fabric indicates increased consumption of oil or incomplete combustion. The turbo allowed the black smoke to power turbines, as well as when blipping. But it needs to be short and not thick. Should try the engine without the air filter. Maybe a clogged filter is the cause of increased opacity.
Irregular, tapping sound in engine performance indicates that the adjustment of the valves, and possibly, problems with the valves or piston. "Hard" sound in combination with the black smoke at high rpm means the early injection angle. Interruptions and grey smoke at idle in combination with shortages and black smoke at high – a late injection angle. A rough running diesel at idle in combination with the black smoke reveals the non-working injector. To test this, disable it. The engine will work gently.
Opening the oil cap, check no oil spray from the oil fill neck. Their presence is an indicator of blowby. The reasons for this can be many.
You should evaluate the General appearance of the engine compartment. If the nuts on the injectors and cylinder block are free of nicks, if traces of white or red sealant (black, from Japanese cars), so the engine has not been opened. You also need to check mounting bolts on all accessory devices. The condition of the ear is tested this way: to warm up the car, and immediately turn the ignition on. The oil pressure indicator should light up in 2-3 seconds. If before – liners should be changed.
At the station or in the garage equipped to measure compression. Compression should be at least 25. However, this value can be different for each engine size. The variation should not exceed 0.5 for a new car and 1-2 old. A large spread indicates a future overhaul. Low compression can be due to wear of the piston or worn valves. Wear of valve repair cheaper and easier.
The injector when the work needs to emit a characteristic sound and spraying the fuel in dusty condition. Spraying in the form of drops and jets is absolutely contraindicated the engine. With the injectors, you should evaluate the hoses for leaks fuel flow and reverse flow.
The color of the oil should be black, without impurities. Silver-grey shade of the color of oil indicates a recent use of molybdenum additives.
Cooling system
You should verify the absence of bubbles on a warm engine at medium and high rpm. Metal piping should be free of rust and red plaque (a sign that the engine was overheating).
The last step is the measurement of the pressure of crankcase gases. The high value of this indicator can only be due to worn piston or valves.
Finding fault in choosing a car, you first need to assess the prospects of repair of these problems. And only then make a decision: to abandon the purchase of the car or bring down the price.
Useful advice
It is impossible to inform the seller on how and what you will test. He can "take action" and to hide problems of the vehicle sold.
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