Q: I have a 2009 VW with gasoline direct inject and a 2.0-liter turbo engine. It recently needed the intake valves cleaned (a very costly job) after just 54,000 miles. I understand many ...

Only air and blow-by goes past the intake valves in a direct-injected engine. There’s no repetitive pressurized squirting of gasoline over the DI engine’s intake valves to help keep them clean.

Gasoline direct injection, or GDI, is one of the most crucial bits of technology in the modern internal combustion engine.In engines equipped with GDI, highly pressurized gasoline is sprayed ...

Gasoline direct injection (DI) engines have been lurking in the shadows of gasoline-burning, internal combustion engine development for decades but are now becoming mainstream.

This air/fuel mix, which is ideal for combustion, travels through the intake manifold and past the engine's intake valves, then is compressed by the pistons and ignited by sparkplugs.

Direct injection Direct injection is a newer technology. It differs to port injection in that the fuel injector delivers fuel directly into the cylinder chamber, rather than through the intake valve.