The intake manifold is designed in such a way that the intake air is directed along a long or short path by means of flaps. At engine speeds below about 4000 rpm, the dampers are closed, the intake air moves along a long path, and as a result, engine torque is increased. Above 4,000 rpm, the dampers open and the intake air is directed along a short path, thereby increasing power. The control unit of the injection system controls the movement of the flaps using a vacuum valve, which includes a diaphragm mechanism for driving the flap shaft.
The exhaust gas recirculation system consists of mechanical and electrical valves and serves to reduce the amount of NOx in the exhaust gases even before the catalyst.
The electronic control unit is located in the right footwell under the plastic cover.
Warning: When working on injection systems, attention must be paid to impeccable cleanliness. Before dismantling, the relevant parts must be cleaned with petrol. The system is under high pressure. Therefore, before replacing parts to reduce pressure in the system, it is necessary to slowly unscrew the fuel line between the fuel pump and the filter. Put a rag under the fuel line first. The high pressure drops on its own (without opening the fuel line) several hours after stopping the engine.
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