All engines with electronic injection systemfuel are equipped with devices that maintain the required fuel pressure in the fuel line. In the power unit VAZ-2114 this function is performed by a special regulator. It is thanks to him that gasoline under pressure comes to the nozzles in the right amount, depending on the mode of operation of the motor.
In this article, we'll talk about what the VAZ-2114 fuel pressure regulator is, how it is arranged and where it is located. In addition, consider its possible malfunctions and methods for their elimination.
Structurally the fuel pressure regulator VAZ-2114is a membrane bypass valve, enclosed in a metal casing. It is mounted on a ramp, inserted into it by one of the nozzles through a rubber seal. The other output of the RDT is connected to the fuel line. To determine the magnitude of the load on the engine, the regulator is connected to the intake manifold by a vacuum hose. Thus, the fuel on the one side comes from under the head of the gasoline pump, and on the other hand - the air pressure and the force of the valve spring.
The fuel pressure regulator VAZ-2114 hassufficiently simple operation. When you press the accelerator pedal, an excess pressure is created in the intake manifold, which opens the valve, allowing more fuel into the ramp. When the throttle valve is closed, the air pressure in the intake pipe is weakened. The valve thus opens in other party, letting out gasoline back in топливопровод.
The faulty fuel pressure regulator VAZ-2114 does not carry a critical threat, but its failure violates the stable operation of the engine. Symptoms of a RDT failure can be:
Having found out the listed signs of malfunction of RDT, it is necessary to diagnose the device and determine the cause of the failure.
Given that the design of the pressure regulator is mechanical, disturbances in its operation can occur quite often. The most common faults of the device include:
The weakening of the diaphragm spring causes the valve to not cope with the pressure of the air coming from the intake manifold. As a result, the head and the amount of incoming fuel are reduced.
The jamming of the valve leads touncontrolled supply of fuel to the collector and its "waste" in the fuel line. In this case, the consumption of gasoline increases, and the engine stops normally starting because of interruptions in the supply of fuel.
Similar symptoms of a malfunction can beWatch and block the regulator. Dirt and deposits reduce the capacity of the system, as a result of which the fuel pressure decreases significantly, the engine "chokes", and the normal idling disappears.
If the connection between the regulator and the ram is not tight, the air pressure may drop, which again leads to a reduction in the fuel head.
In order to verify the correctness (malfunction) of the RDT, as well as the entire fuel system, it is necessary to determine the fuel pressure value. Naturally, this will require a special tool.
Before checking the fuel pressureramp, it is not superfluous to find out how this process is carried out. To be able to more accurately determine a possible malfunction, pressure measurements should be carried out in several modes:
According to the information of the manufacturer, for VAZ-2114 the pressure in the fuel rail should be:
The order of the pressure measurements is as follows.First we connect a fuel manometer to one end of the hose, fix the connection with a yoke. Unscrew the cap on the fuel rail (on the side opposite the one where the RDT is installed). We substitute a nozzle for the collection of fuel. The cap for the nipples is pressed against the central protrusion, thus squeezing the fuel pressure in the system. This process is mandatory! Further, without removing the container, unscrew the locking nipple completely.
When the fuel remains in the container, we put onon the union the other end of the hose and fix it with a yoke. We turn on the ignition and wait until the gasoline pump pumps fuel into the system. Check the pressure and compare it with the recommended one.
After that we start the engine and producemeasurements at idle. The working capacity of the fuel pressure regulator is checked when the vacuum hose is disconnected from it and on the operating power unit. If the pressure has increased to 3.3 kg / cm2, the regulator can be considered serviceable. If it has not changed, RDT, most likely, has become worthless.
Similarly, we make measurements of pressure with the blocked hose "return", as well as in the mode of perehazovki.
In the event that the verification has confirmed a malfunctionRDT, it must either be repaired or replaced. However, it should be noted here that it is simply impossible to buy any spare parts for this device, so it is much easier to purchase a new fuel pressure regulator VAZ-2114, the price for which does not exceed 800 rubles.
Replacement of RDT can be carried out both with the removedfuel rail, and without dismantling it. The latter option is more preferable, since it takes less time. But before removing the fuel rail or the regulator itself, do not forget to lower the pressure in the system in the way described above! Otherwise, the entire engine compartment will be splashed with gasoline.
So, let's look at how the VAZ-2114 fuel pressure regulator is replaced without dismantling the ramp. This will require:
Here, in principle, and the whole process.Installation of RTD is in the reverse order. Important: do not lose the rubber seal that comes with the regulator. Without it, the connection of the RDT and the fuel rail will be leaking, which will lead to a change in the working pressure in the system.
In order for the fuel pressure regulator not to cause trouble for you and work as long as possible, use these tips.