I have been advised by a diesel diagnostic specialist (First Diesel in South London) to try an injector cleaner additive to see if it will clear a suspected blocked injector before booking a diagnostic session. The car a Focus MKII TDCi 2004 is suffering from rough idle after it has warmed up. He said to make sure to use a cleaner which is compatible with the injector technology used on the car.
I just rang a Ford service department to ask what injector cleaner Ford recommend - they didn't know and said they don't get involved with additive injector cleaners.
Anyone care to make a recommendation or are all brands much of a muchness?