The injector is actually a valve, which sprays fuel for internal combustion engines, in a flames or directly in the engine combustion room.
Until the appearance of the injection system (before 1990), the petrol mixture was produced in carburettori, which had many disadvantages.
In diesel engines, the injection system has worked from the beginning, whether it was a mechanic or electronic control. This system has been permanently improved, initially with a mechanical injection, therefore with injection of electron points, and subsequently with multiple injection calculated, with two construction variations: pump injector or common ramp (common ramp).
In modern petrol engines, the injection is similar to that with the common ramp that simultaneously provides all injectors.

Each piston corresponds to a injector, a complex and very important component, which is programmed to know when and how much fuel splashes.
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- Simptome injector defect
Simptome injector defect
Although constructively there are different models of injectors who have different defects, since most of the parts of the components are found, in one form or another in all types of production, the most common defects of the injectors are:
- The arc of the height loses the opening of elasticity at a lower pressure. In this situation they open faster than they should, leading to change. The fuel will be injected at a lower pressure and in a lesser quantity than the optimal, which will decrease from the efficiency of the engine.
- Culbed or decalibrated doses due to calamine deposits, when using low quality fuel.
- Sifa of the city at very low speeds, with short distances, with repeated departures and stops, the engine is always cold.
DISEL Injector Interior (Diesel) Symptoms of damage:
- Since diesel engines work at relatively low speeds, the injectors will allow to deposit the squid, bringing to clogging.
- Losing power, possible dirty injector.
- The engine provides faults – multiple causes (dirty injector that opens the incomplete, clogged injector or the injector that will not open).
- In the ranks there are oscillations of the engine speed – dirty injector that does not spray even the fuel.
- The smell of diesel – the injector has a non -functional valve, which allows the loss of diesel in it, even when it is not in operation.
- Diesel consumption increases compared to normal: the injector is defective.
Petrol injector Simptome defect:
- The engine vibrates: if the injector has problems, the corresponding cylinder will not be able to burn the fuel, leading to vibrations in walking.
- Fuel leaks – If you find traces of petrol on the surface of thejector, it means that it is damaged.
- The on -Board control baton (engine control): the engine control unit will turn on the baton «controls the engine» in case of defective injector, dirty or blocked.
- Excessive emissions – a used injector can cause the fact that the air / fuel ratio is so rich that the catalytic converter (catalyst) is falling.
- Abnormal motor transgressions
- Beat in the engine area (blowing in the injector area)
Symptoms defects of the lawory, municipalities for multiple car brands
Symptoms of defective injector | Car brands |
BMW, Mercedes, Opel, Iveco, Renault, VW (Touran, Sharan, Transporter T5, Caddy, Golf, Passat), Audi (A6, A4, A4, A3), Seat, Hyundai, Fiat, Ford, Dacia Logan, Peugeot, Alfa Romeo, Mazda, Ssangyong, Land Rover, Skoda, |
Causes of lacking functioning of the injection system:
- Overheat the components of the injection system (injectors, injection pump, pressure regulator)
- Impurities in the installation of the fuel supply
- Defective engine components (e.g. defective turbine)
- Non -professional interventions to the injection system or related systems
Specialists advise you not to try to refurbish the injectors at home after the videos, because they risk breaking them even more hard or breaking the engine.
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