decarbonization, Im undecided

[L31MaxExpress]

Seems the current correct answer with keeping intake valves clean on DI engines is to have auxiliary port injectors spraying on them. Last I checked, Ford doesn't even have an approved intake tract cleaning method for the valves. They figure if you use a solvent that it'll shell a turbo so they replace heads under warranty. After that good luck.

I used the BMW method on my Infiniti M56S. Walnut shell blasting followed by B12 Chemtool. Ran perfect after that.

 

[Donald Mitchell]

The old mechanics i knew would rev them motor and dribble water out of a coke bottle into the carb.