I have some TBI injectors that seems to not perform well. The spray pattern is not a fine mist but sometimes you can see a drops. Also when they get hot, they produce some growling type of noise that can be heard quiet loud.

I don`t have any experience with these so don`t know which is normal.

Do these seems shot and can it be cleaned with some fuel additives. How about bumping the fuel pressure. I got 3bar pump already and now the pressure is around 1 bar. WHat is the max they can handle and will it cure the course mist pattern.