Does anyone have experience performing a decarbon procedure on the intake valves of a GM DI engine? We have an Acadia 2010 with codes P0300 and P0301. It looks like cleaners introduced through the fuel will not clean the intake valves in these engines. I can certainly figure out how to dribble a liquid into an intake but it seems fairly risky for someone with no experience.
2011 Cadillac CTS | CTS VIN D Service Manual | Document ID: 2863222