Cleaning fuel injectors is often a service recommended by dealers and car repair shops, but unless there are obvious signs of clogged injectors (such as a slight irregularity, poor acceleration or high emission levels), it may not necessary.
It is not by chance that the cleaning of fuel injectors is not usually mentioned in the car maintenance programs of ordinary cars. Many mechanics promote a quick injector cleaning service that involves passing a cleaning solution through injectors while still being mounted on the engine. For more thorough (and costly) cleaning of severely injected injectors, remove the injectors and clean them with a machine designed for this purpose.
Injectors clog up when deposits accumulate over time and after having traveled thousands of miles. When this happens, they do not release the thin fuel fog that provides maximum performance and efficiency. If this happens, you will notice a loss of engine performance or a lower fuel economy.
The type of gas you use can also be an important factor. All gasoline should contain “detergents” that prevent carbon deposits, paint and other debris from forming in the feed system, but not all brands use the same amount. Low price brands often only use the minimum of detergents, but so-called top-level brands use more quantities, and some vehicle manufacturers recommend them because of this reason.
So, the injector problems today are not as widespread as they once were. However, direct injection of gas – a more sophisticated injection system that operates under increased pressure – is becoming common in engines, and some have been shown to be more prone to glimpse of normal injection. That is why some manufacturers – such as Hyundai and Kia, among others – recommend the regular addition of a fuel system cleaner to the fuel tank.