The injection engine is designed for high-grade gasoline, which is not often found at our gas stations. In addition, different injection systems have their own specific features, which must be taken into account when operating the machine. And there are quite a few such systems on our market: with mechanical injection "K(KE)-Jetronic", electromechanical "L-Jetronic" and electronic - "Motronic", "Lucas", "Marelli".
Many systems have two operating modes: main and emergency - when one of the sensors fails. The driver may not even notice such a malfunction: there is no alarm signal on the dashboard, and the engine continues to run (but no longer in optimal mode). This often happens in the "Audi-80" with central injection. About a third of car owners who have such cars do not even realize that they are driving in emergency mode. This leads to increased fuel consumption, reduced power, uneven engine operation and difficult starting. The malfunction is detected only during routine maintenance. Therefore, it is worth dwelling in more detail on the "weak" points of each system that manifest themselves in our conditions.
Systems with mechanical injection. They are more susceptible to physical wear and tear than others. The fuel pressure regulator usually fails after 80-120 thousand km of mileage (engine starting becomes noticeably worse), injectors - after 60-80 thousand (uneven engine operation, increased fuel consumption). Injector failure is especially tricky because it is not immediately noticeable. Special equipment is required for diagnostics and repair.
The weak point of systems with electromechanical injection is air suction through numerous vacuum hoses, which tend to crack after 4-5 years of service. Especially on BMW and, to a lesser extent, on Audi. It is quite difficult to detect such a defect.
Electronic systems have their own problems. For example, the battery is dead, and out of old habit you decide to jump-start it from another car. As a result, the electronic unit fails. And the use of leaded gasoline, in turn, will render the lambda probe and catalytic converter unusable.
In general, both mechanical and electronic injection systems have their pros and cons. In mechanical vehicles, fuel pumps and distributors often fail. Electronic fuel pumps are more durable and cheaper, but any computer failure will be expensive. In addition, unfortunately, we have more reasons for any system to fail than in Western Europe or America: low-quality gasoline, dirt on the roads and the chemicals that are sprinkled on them. Therefore, it is worth listening to the recommendations of experts. Try to use imported gasoline if possible; to remove moisture from fuel lines, pour a special preparation into the tank every time you fill up; every 10,000-15,000 km, perform a complete flush of the injection system.
Reference
Another feature: any failure is recorded by the computer. And even after replacing the faulty part, it will continue to issue incorrect commands until the failure is "erased" on a special stand.
(Original material on the website «hondabook.ru»)