Elements of the injection engine power system: 1 - air intake; 2 - air filter housing; 3 - sleeve for supplying air to the throttle body; 4 - throttle body with idle speed control; 5 - fuel rail; 6 - fuel filter; 7 - electric fuel pump with fuel gauge sensor; 8 - fuel tank; 9 - tank ventilation hose; 10 - filler pipe; 11 - gravity valve; 12 - bypass valve; 13 - check valve; 14 - safety valve; 15 - adsorber
The vehicle power system is designed to store fuel, clean fuel and air from impurities, supply air and fuel to the engine cylinders. The injection engine power system consists of a fuel tank, an electric fuel pump with a fuel gauge sensor, fuel lines, a fuel filter, a fuel rail with injectors, an air filter, air supply hoses, a throttle valve with a drive, and a fuel vapor recovery system.
The air entering the engine cylinders is cleaned of dust by an air filter.
Air filter housing mounted in the engine compartment on three rubber mounts. The filter element of the filter is replaceable, made of special paper. To prevent the ingress of polluted air into the intake tract, there is a sealing border on top of the element. To replace the filter element, the filter cover is made removable. The purified air passes through the mass air flow sensor through the sleeve to the throttle valve.
throttle body mounted on the receiver flange studs. The throttle valve regulates the amount of air entering the engine cylinders. Damper drive - from the pedal "gas", cable. The damper rotates on an axis in the housing. A coolant passage is made in the throttle body. The channel is connected to the cooling system by rubber hoses. The circulation of coolant through the throttle body prevents freezing of the internal air cavities of the body in winter. Fittings are installed in the housing for connection with the adsorber and the engine crankcase ventilation system.
Throttle body: 1 - fitting for connection with the adsorber; 2 - branch pipe of the throttle body; 3 - throttle valve; 4 - throttle actuator sector; 5 - crankcase exhaust fitting; 6 - fittings for connection with the engine cooling system; 7 - throttle position sensor; 8 - idle speed regulator
idle speed controller is a shut-off valve driven by an electric stepper motor. The regulator is mounted on the throttle body below the throttle position sensor.
At the signal of the electronic control unit (ECU) the regulator changes the cross section of the additional air supply channel, thereby adjusting the idle speed of the crankshaft.
Fuel tank - steel, lead-coated, welded from two stamped parts. The tank of the VAZ-2104 is attached to the studs of the bottom of the body with four nuts. The filler neck of the fuel tank is closed with a stopper and led into the niche of the filler neck on the left wing.
Fuel tank of the car VAZ-2104
Fuel is supplied from the tank electric petrol pump, combined with the fuel gauge sensor. A mesh filter is installed at the pump inlet pipe, which traps large particles of contaminants that have entered the fuel tank along with gasoline. The pump is switched on by the ECU. A serviceable pump must develop a pressure of at least 3.2 bar (320 kPa).
The electric fuel pump of the VAZ-2104 car: 1 - receiving strainer; 2 - fuel pump; 3 - fuel gauge sensor; 4 - inlet tube; 5 - drain tube; 6 - electrical connector block; 7 - sensor float
From the pump through the fuel pipe, the fuel enters the fuel filter for more thorough cleaning.
Fuel filter - installed on the bracket of the partition of the engine compartment and built into the pipeline between the electric fuel pump and the fuel rail. The filter element - paper, is in the metal non-separable case. An arrow is applied on the filter housing, which shows the direction of fuel movement in the filter. The purified fuel enters the fuel rail through the fuel pipe.
fuel rail It is a hollow bar through which fuel is supplied to four nozzles fixed on it. Rail connections with injectors, pressure regulator and fuel pipes are sealed with rubber rings. The ramp is fixed to the intake manifold with two screws. At the top of the ramp (next to the injector of the third cylinder) there is a fitting for fuel pressure control, closed with a protective cap.
Fuel rail assembly: 1- nozzle; 2 - inlet tube; 3 - drain tube; 4 - fuel rail; 5 - fitting with a spool valve for checking the working pressure (closed with screw cap); 6 - fuel pressure regulator
Fuel pressure control - a bypass valve that maintains a working pressure in the power system within 2.8-3.2 bar (280-320 kPa) depending on the vacuum in the receiver, necessary for the correct operation of the engine. The regulator is mounted on the fuel rail.
Nozzle fixed on the ramp with a metal clamp and is an electromechanical valve, when an electrical impulse from the computer is applied to it, the nozzle openings open and fuel is supplied (injection) into the engine intake manifold. The amount of fuel supplied depends on the duration of the pulse.
Attention! Injectors installed on vehicles may differ in overall dimensions and characteristics. When replacing, install an injector identical to those installed on your car.
In accordance with the environmental requirements of EBPO II, the vehicle is equipped with fuel vapor recovery system. The system consists of an adsorber with a purge solenoid valve (installed in the engine compartment), safety, check and bypass valves (installed in the niche of the rear wing on the left side, under the lining of the luggage compartment), connecting tubes and hoses. Fuel vapors from the tank enter through the bypass, check and gravity valves into the adsorber.
The safety valve, which has an outlet to the atmosphere, regulates the fuel vapor pressure in the tank.
A gravity valve is installed in the vapor recovery system line and prevents fuel from leaking out of the tank when the vehicle rolls over.
Adsorber has three pipes. Through the pipe "TANK" (designation on the body) When the engine is not running, fuel vapors entering the adsorber are absorbed and retained by activated carbon. The second pipe, marked "AIR", connected to the atmosphere, and the third (branch pipe of the solenoid valve purge adsorber) - Connected with a hose to the throttle body fitting. After starting the engine (when the coolant temperature is above 75°C, the vehicle speed is more than 10 km/h and the throttle valve is opened by more than 4%) The ECU sends a signal to open the canister purge valve, which communicates the canister cavity with the throttle body. In this case, the adsorber is purged - mixing fuel vapors with air and their further flow through the throttle body, receiver and intake pipeline into the combustion chambers. The higher the air consumption of the engine (with an increase in crankshaft speed), the more intense the purge is.
Adsorber: 1 - adsorber body; 2 - branch pipe for connecting the internal cavity of the adsorber with the atmosphere; 3 - adsorber purge valve; 4 - connecting branch pipe of the valve; 5 - adsorber connecting pipe