Gasoline Direct Injection (GDI) is an advanced fuel injection technology where highly pressurized gasoline is injected straight into the engine cylinders rather than into the intake manifold. This allows for precise fuel metering, higher compression ratios, and improved power and efficiency. However, because fuel no longer washes over the intake valves, GDI engines are prone to severe carbon buildup on the valves over time.
The customer has a rough idle on their GDI engine, so we need to quote them for a walnut blast on the intake valves.
A common maintenance issue with GDI engines is intake valve carbon tracking, requiring physical cleaning media like crushed walnut shells since fuel additives never touch the top of the valves.
Also heard as
- Gasoline Direct Injection
- direct injection
- DFI
- direct fuel injection
Related terms
EFI
Electronic Fuel Injection is a computer-controlled system that atomizes fuel into the engine.
TBI
Throttle body injection is an early electronic fuel delivery system that sprays fuel centrally before the intake manifold.
PFI
This fuel delivery design positions the injectors just upstream of the intake valves.
Intake valve
A mechanical valve in the cylinder head that opens to allow air into the combustion chamber.