Injector listening test, the most affordable and easy to do, even a long screwdriver can be used.
Second thing, we will check supply voltage to injectors and i showed that they all got approximately 13.69-13.7 volts.
Then we started the engine and back probe to injectors ground wire and connected our Uni-made LED tester to battery ground terminal (negative). When we touch ground wire of injector with engine running the LED light were flashing really fast even on idle and after increasing engine RPM's it went even faster, so that showed that all injector are triggered with ground wire and they all working properly and that with more engine RPMs frequency increases so they mast open faster.
If periodically I had cleaned my injector with injector cleaner like: DCS, ect...to make my injector fresh up and my 4afe engine good performance, what I do is enough or not?
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