90tbi305

How can i test to see if my fuel injectors are fine?

Benm109

Fine, in what way? What kind of problem are you having?


Anyway, easiest thing to check first is the resistance of them. Take off the air cleaner lid, disconnect the wiring from the injectors, and put you multimeter leads across the electrical connectors on the injectors themselves. Should read 1-2 ohms.

You can check for leaking injectors by just turning the key to accessories (KOEO, key on engine off) to let the fuel pump prime, and watch the injectors to see if they are dripping or leaking gas. And, while the car is running, you can watch the spray pattern of the injectors. The injectors should spray in a conical shape, with an occasional drip in the middle while running.

If only 1 injector is spraying fuel when cranking or while running, switch the injector wiring between the 2 and see if starts working then.

If the car is not running, you can buy a noid light (you can also use a test light) for GM TBIs. They sell individual noid lights at most auto parts stores. Just remove the wiring from 1 injector, attach the noid light to the wiring, and let someone attempt to start the car. If the light blinks, than you know the wiring to the injectors is good and the computer is sending the signal to fire them. Repeat the test for the other injector.

90tbi305

Well it looks like the driver injector is not shoting in a cone shape like the injector on the passanger side. I am going to see what happens when i switch the wiring plugs on the injectors. Thanks