Anyone use Seafoam?

[Yaris Hilton]

The Seafoam itself smokes. Put it in a brand new engine and you'll smoke up the whole neighborhood. This stuff isn't anything new, there have been similar engine decarbonizers sold since the early days of the automobile. They went out of fashion when catalytic converters came along. It's possible to badly overheat a catalyst while the engine's misfiring and putting out unburned fuel and solvent into the exhaust. Last year I successfully cleaned up my Mercury Villager's engine with a similar solvent. Afterward it ran better and had no apparent harm.

The other old method of cleaning carbon is, of course, to trickle water into the warm running engine's intake. The rapid cooling shocks the carbon loose from the surfaces.

You'll need an OBD II code reader to clear the misfiring code when you get done.