Fuel injectors not spraying - 2012 Mazda 6 i Sport Sedan 2.5L 4-cyl. 6-speed Manual

They are clogged up ,need cleaning.

Check for fuel injector pulse and proper fuel pressure and volume.

could be clogged up, clean injectors. gunk in bottom of fuel tank can be sucked through and block injectors. also check fuel pump.

Unless you have a clogged fuel line going into the throttle body, something got missed.
With the key on, can you ground one of the injectors and make it spray ?

eec relay? Is there power to injectors? blinking ground on injector? with test light? fusible link problem?

to be honest, with an 89, all you can do is replace the injector. how an injector works is there is a small amount of current that is run to a coil around a rod (if you are unaware, this produces magnetic fields). the magnetic field produced pulls up what is usually a small ball, allowing fuel to go through the tip of the injector nozzle. all you can do to fix this is to buy different injectors.

just a question..why do you think they are spraying too much fuel? because it may just be that you have excessive fuel pressure and your fuel pressure regulator is bad. hit me back.

I would hate to say it may the ecm, I would swap with a known good ecm.
see if that makes any difference. good luck!

always check fuel pressure and "pulse"at injector .

change the injector,its the only thing left