Fuel injection system components (Escort 5)

Fuel injector

The fuel injector, centrally mounted in the CFI unit, is an electromagnetic valve that supplies a certain dose of fuel for the corresponding engine load mode. This dose of fuel in the form of finely atomized particles is sent directly to the intake manifold. At idle, the fuel injector opens at every second intake stroke, while the car is moving - at every intake stroke. At the same time, the injector is under constant fuel pressure, which is provided by the fuel pump and maintained by the pressure regulator.

Relieve the pressure in the fuel system and equalize the pressure in the tank with atmospheric pressure by removing the fuel filler neck.

Remove the negative terminal from the battery. Remove the air filter housing.

Remove the electrical connector from the top of the fuel injector (see Fig. 4B.7).



Bend back the clamps and unscrew the fuel injector mounting bolts. Remove the fuel injector mounting cover and, after marking its location, remove it from the injector (see Fig. 4B.8-4B.12).













Installation is performed in the reverse order of removal. When installing the fuel injector, it is necessary to use new sealing rings, which must be lubricated with clean engine oil before installation (see Fig. 4B.13, 4B.14).

Fuel pressure regulator

The fuel pressure regulator is installed directly in the injector body. It controls the fuel pressure and maintains its value at the fuel injector equal to 1 bar. Excess fuel returns to the fuel tank. The pressure regulator has a mechanical operating principle with a spring-loaded membrane. Remove the injector from the engine.

Unscrew the 4 screws holding the regulator and remove it, noting the position in which it was installed. Do not remove the plug located in the outer center of the regulator and do not adjust the screw located under the plug, as this will change the pressure in the fuel system.

If necessary, disassemble the regulator, noting the location of the parts, and check them for wear and damage. Assemble the regulator by installing in sequence the small spring, valve, diaphragm, large spring, cup and regulator cover. Insert the regulator into the injector and secure it with screws.



If the central adjustment screw of the regulator was rotated, then make the initial adjustment by screwing the screw in by hand and unscrewing it by 3 full turns. Install the injector on the engine. If the central pressure adjustment screw on the regulator was rotated, then it is necessary to check the pressure in the fuel system at the first convenient opportunity at the service station.

Injector

Relieve pressure in the fuel system. Remove the negative terminal from the battery.

Remove the air filter housing. Clamp the coolant supply hoses to the injector and disconnect them from it.

Disconnect the fuel supply and return lines from the injector. Remove the accelerator cable from the injector.

Disconnect the intake air temperature sensor and the throttle control motor. Disconnect the vacuum hose from the injector.

Unscrew 4 screws and remove the injector from the intake manifold. Remove the injector gasket (see Fig. 4B.15).



Clean the mating surfaces of the injector and intake manifold. Installation is performed in the reverse order of removal. Check and, if necessary, top up the coolant in the cooling system. After installing the injector, turn on the ignition at least 5 times to increase the pressure in the fuel system and check its tightness.

Throttle control motor

Remove the negative terminal from the battery. Remove the air cleaner housing. Disconnect the electrical connectors from the throttle position sensor and the throttle control motor (see Fig. 4B 16, 4B.17).





Unscrew the suspension mounting screws and remove the suspension from the throttle control motor (see Fig. 4B.18).



Unscrew the screws securing the engine to the suspension and remove it from the suspension. Installation is performed in the reverse order of removal.

Fuel adsorber

The fuel canister is attached to the absolute pressure sensor in the intake manifold (see Fig. 4B.19).



Remove the negative terminal from the battery. Disconnect the vacuum hoses from the fuel canister and remove it.

Installation is performed in the reverse order of removal. Position the fuel canister with the "CARB" mark to the intake manifold and the "DIST" mark to the absolute pressure sensor (see Fig. 4B.20)

ECU Block

Remove the negative terminal from the battery
Remove the trim from the front lower part on the passenger side. To do this, turn the mounting knuckle with a screwdriver a quarter turn and detach the trim (see Fig. 4B.21).



Release the ECU unit from the holder, then unscrew the mounting bolts and remove the electrical connector (see Fig. 4B.22).





Installation is carried out in the reverse order of removal.

Incoming air temperature sensor

Remove the air filter housing. Remove the connector from the sensor, then unscrew the sensor from the injector.

Installation is carried out in the reverse order of removal

Throttle Position Sensor

Remove the air filter housing. Remove the electrical connector from the sensor. Unscrew the screws and remove the throttle position sensor housing. Do not rotate the sensor in the removed position, as it is very easy to damage it (see Fig. 4B.23).



Installation is performed in the reverse order of removal. In this case, precisely align the cut on the throttle valve axis with the protrusion on the sensor. Tighten the sensor mounting screws evenly (see Fig. 4B.24).

Vehicle speed sensor

The speed sensor is mounted on the speedometer drive shaft. It creates an alternating voltage, the frequency of which is proportional to the speed of the car.

The sensor is installed at the base of the speedometer motor drive and is removed from its drive gear.

Absolute pressure sensor

The sensor is located on the right side of the rear part of the engine compartment (see Fig. 4B.25).



Disconnect the electrical connector and vacuum hose from the sensor. Unscrew the 2 mounting screws and remove the sensor. Installation is performed in the reverse order of removal.

Power steering pressure sensor.

Remove the electrical connector from the sensor. Unscrew the sensor. Place a clean rag under the sensor to catch any leaking fluid. Check the condition of the sensor sealing ring and replace it if necessary (see Fig. 4B.26).



Installation is performed in the reverse order of removal. If necessary, bring the fluid level in the steering system up to the norm.

Oxygen sensor

The oxygen sensor is mounted on the exhaust pipe and is electrically heated to achieve operating temperature after a cold start. The voltage signal generated in the sensor when the oxygen content changes is used by the ECU along with the signal parameters from other sensors to prepare the optimal fuel mixture.

Remove the electrical connector from the sensor wire. Raise the front of the car and secure it on stands. Unscrew the sensor from the exhaust pipe and remove it from underneath the car.

Installation is performed in the reverse order of removal. Lubricate the threaded part of the sensor with a non-stick compound.

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