Скачать или смотреть Gas Direct Injection Maintenance / Fuel induction service does my car need it?

The fuel induction service is a way to clean some of the soft deposits inside the intake system of an engine without taking it apart. It involves spraying a cleaner spray through the intake system. The fuel induction service is not a part of manufacturer-recommended maintenance, but it might be helpful to a degree in some high-mileage engines. Of course, it is not a universal solution for all cars.

This service is often recommended to clean the intake valves and ports in engines with Gasoline Direct Injection (DI or GDI). Repair shops and dealers may call it GDI Induction Service. In gasoline direct injection, the fuel injectors spray fuel directly into the combustion chambers under very high pressure.

Thanks to this design, an engine with a direct injection is 10-20% more efficient than a similar engine with a conventional port fuel injection. However, there is one drawback. In a port fuel injection, injectors spray right on the back of the intake valves, "cleaning" them.

In direct fuel injection, fuel is sprayed under the intake valves. As a result, in some GDI engines, carbon deposits accumulate on the backside of the intake valves. Deposits can accumulate on the tips of the injectors too.

This problem is more likely to affect vehicles that are used for frequent short trips, especially in cold weather. The process is gradual, which means it only happens at higher mileage. Bad gasoline, lack of oil changes and poor oil quality also make this problem worse.

Symptoms of excessive deposits on the intake valves and ports include running rough, misfiring when the engine is started cold, unstable idle and a lack of power at higher speeds. Of course, these symptoms can be caused by other things and need to be properly diagnosed.

Do all cars have direct injection? No, almost all modern cars sold before 2010 had port fuel injection. In 2019, more than half of all gasoline-powered new cars sold in North America have direct injection; others have port fuel injection. Car makers switched to direct fuel injection to comply with tougher fuel economy standards and emissions regulations.

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