Description of the design of the fuel injection system

For a long time now, under the hood of modern cars, electronically controlled fuel injection systems have set the tone in the intake tract of gasoline engines. In the exhaust system, the variable triple acting catalyst is state of the art. Of course, all Focus engines are electronically controlled from the air filter to the final muffler: the air-fuel mixture in them is prepared by sequential fuel injection systems, assisted by triple-acting catalysts. The ignition spark is controlled by a distributorless ignition system in a 1-3-4-2 sequence. It is controlled, like the entire electronic engine control system, by a powerful on-board computer. The Focus uses the latest generation of the Ford EEC-V computer. The systems are largely maintenance-free - possible malfunctions, in experience, can only be located with deep professional knowledge and electronic measuring equipment: without the Ford FDS 2000 system tester, this will be beyond the capabilities of even advanced hobbyists. Therefore, in the event of a malfunction in the ignition system in your Focus, it is better to trust your dealer or specialists. However, you should be familiar with the air/fuel mixture in your Focus in general terms. At least in order to be able to more accurately determine the possible occurring malfunctions. This saves you on expensive diagnostics, because the more accurately you can formulate a repair order, the lower your future bill will be. Further in the text, we will consider in detail, for example, the air-fuel mixture preparation system in all Focus Ford Zetec-SE gasoline engines.