Petrol injection system in 1.1i/1.4i/1.6i engines

Fuel from the tank is delivered to the CFJ injection device (pic. 2.116) using the pump located at the tank. This pump delivers 2 dm³ of fuel per minute at a pressure of 2.5 bar. In the injection device, the fuel pressure is reduced to 1 bar. This is done by a pressure reducing valve placed in the CFJ. Excess fuel is returned to the fuel tank through overflow lines. The fuel pump is equipped with a return valve. Thanks to this valve, the fuel pressure in the injection device is maintained while the car is parked.



The CFJ has an intake air temperature sensor (pic. 2.117).



This sensor is an electrical device and a change in ambient temperature causes a change in its electrical resistance. A coolant temperature sensor is installed in the engine cooling system (pic. 2.118).




A heated lambda probe placed in the exhaust system detects the composition of the exhaust gases and transmits the corresponding signals processed in the microprocessor of the fuel injection control device. The vacuum gauge is located on the intake manifold (pic. 2.119).



It is connected to the collector with an elastic hose. The injection control system also receives signals about the current driving speed. Speed sensor mounted on gearbox (pic. 2.120).



The current damper position is monitored by a potentiometer (pic. 2.121), that sends signals to the CFJ device.




The idling speed is regulated by changing the position of the stop, rearranged by the electric motor (pic. 2.122).



On fig. 2.123 A fuel injector is shown in section.