injector removal

all this after 3 weeks of trying anything else and a ton of wd40,diesel,petrol,etc.no 1 injector stuck,very stuck,today welded a home made tool on it and start sledge hamer it,,,,,,,,,nothing not a move,later hooked the crane and lifted the car from the ground,,,,,,,,,nothing.let it hang for 2 hours ,,,,,,,,,nothing hamer it as was hang on nothing.i am out of ideas,,,,anybody have a clue?

Whacking it like that will not work. It is sized either by being threaded and or heat has caused the problem. Have you tried heating it first then applying a constant torque instead of whacking it? If it still won't budge suggest getting it drilled out but you'll have cuttings in the cylinder and you'll have to retap the thread. I'd pay a garage to get it out.

Hydraulic injector puller probably the only way. Some areas have a mobile guy that goes round garages removing them. If you ask at your local garage they might be able to suggest someone that has one.