Car: Audi S5 2008
I have a problem in my car where sometimes my car will be hard to start after driven for a while. Normally if I floor it close to where I stop the car, it's harder to start. When I took off the inlet air hose, I could smell petrol (after being shut off overnight).
The car doesn't have a problem starting when cold, so I'm suspecting that the fuel is slowly leaking into the cylinder. The car is a direct injection engine, so fuel does not enter the intake ports.
My question is, when the fuel system is shut off under high pressure and the car is hard to start afterwards, does this usually mean fuel is leaking into cylinder via the nozzle of the injector, or around the seals of the injector?