Add Yahoo as a preferred source to see more of our stories on Google. Fuel injectors don't just deliver fuel. They meter it, shaping the spray so the air-fuel mixture burns in the way the engine wants ...

Hello Paul, I have been advised to clean my fuel injectors because my car feels less responsive. What do fuel injectors do, and how does dirt or clogging affect engine performance and fuel economy?

GDI injectors sit in the cylinder head and spray directly into the combustion chamber at higher pressure. You may see carbon on the injector's tip, but that alone doesn't prove problematic.