Why is that Scott ? Not questioning or doubting you in anyway…just wondering. Not been aware of it previously on any of mine. Or any cars I’ve had either.
Also wondering what engine the 5.3 GM engine mentioned is too. Not sure we ever got that engine over here in a boat.
you have many of that motor over there wearing volvo penta and other brands
direct injection motors get a build up of carbon on the back side of the intake valves that can not be cleaned by any fuel cleaners as the injectors squirt go-juice in the combustion chamber.
GM has been recommending intake valve cleaner for 30 some years on direct injected motors
I’m wondering what real advantage direct injection is vs port injection? Port injection is normally very reliable and requires little maintenance. Sounds like yet another dubious “improvement” like cat converter exhaust
direct injection is usually used hand-in-hand with variable valve timing. think of it this way. multi-port injection just means there are multiple injectors somewhere in the intake tract. the fuel event is not that precise. fueling is wet and atomization is about 70% on a good day.
direct injection is up to 5 injections per cylinder event. the fuel is injected into the motor at about 2500 PSI. atomization is close to 95%. the injection event and the valve timing are phased so that you can have a 13:1 motor that idles like an 8:1 lump and then makes power like a drag car. more power, better emissions, better fuel economy