a while back several guys used water to decarbonize the internals of their engines via a vacumn hose, and was curious as to how they are doing.


later

 

Do you mean water injection (WI)??

 

Nope, he's talking about the "ATF/Water Treatment" (you can do a search here on the forum. It's more popular on the 1st and 2nd gens). One guy who did it on his FD, burned part of his bumper.

Just get the car out on the highway and open it up, you'll kick out enough carbon that way. IMO, it's not worth it unless your engine is already heading south.