dis mostly works in DI engines, for FI engines the fuel itself will clean the carbons in valves, intake etc, so for FI engines do italian tuneup is enuf ledi

not exactly, most cars sold in the market are still FI, n i get wat u mean, my car also facing the same problem cos its DI n its a pain in the ass to clean off the carbons, i have tried almost all the ways to remove the carbons but the best way is still to overhaul the engine, but of course its too expensive compared to other treatment methods, this seafoam method i seen before in utube, worth to try it

nope, iswara n all proton cars are FI

port injection engines dont even need decarboning, just do italian tune up can dy