you dont need any special tool ,but you will have to soak them with easing oil -wd40 or similar- overnight if you can, then if you place a spanner on injector where flats are for clamp, you can ease them back and forth untill they become free, dont touch nozzles and make sure that each injector goes back in its original cylinder.worst part is chipping off carbon from where they are blowing! but just take your time and don't break any.good luck.
k
August 2010