A 3 in 1 is a pressurized liquid cleaning system that removes gum and carbon deposits from:
Injectors and the fuel system
Throttle body and intake areas
Piston, upper cylinder and valves
This
system improves on the old fashioned method of just cleaning the
injectors. With a 3 in 1 the carbon build up, and most importantly the
"hard carbon", is removed from these areas, greatly improving the
volumetric efficiency and the combustion process. A 3 in 1 retards the
engine from rebuilding these gums and carbon, a by-product of fuel
delivery and combustion, and leaves you with a clean engine that will
run much more efficiently delivering you: