so I have borrowed a set of noid lights , they deff light up as the engine spins , no way to know if they should be really bright or not but they do light up

yet if I directly add 12v the injector sprays

are they gummed up and the signal is not long enough for them to fire

im so confused here ... im used to cars that have a OBD plug and I can see what's going on

please please please help me before I just start buying more new bits I dont need