I just swapped out my Toyota V6 Denso 297-0019 injectors with
reconditioned FIC injectors and the FIC injectors are working GREAT! Thank you! My idle went from 665 to 645, cool! And engine is smoother.

I have a question about the injectors I just pulled. They are all Toyota part 23250-31050, which is Denso 297-0019. I hooked up some alligator clips and a 9 volt battery to listen to them individually. 3 click with a simple clicking sound, but the other three have a bell-like sound when they click.

Resistance tests show 9.65 - 9.8 (50F ambient today in the garage) , should be 11.6 - 12.4

3 questions

1) What is the bell-like sound?

2) Why would all 6 go so far out of spec on the resistance (12 Ohm specs)? Shouldn't one or two go bad, not all 6? Car has 110k.

3) Are these injectors rebuildable?

I have personally no clue the properties of a Denso injector... but I will be equally curious to see what FIC has to say on the subject.

In my world, Corvettes, we have to deal with a GM injector made by "Multech". It's ok, but they fail rather quickly... but they don't go all that far out of resistance, usually, they just gum up internally.

Ok, the ambient made a huge difference. I brought the injectors inside the house and now they have 12.3-12.4 Ohm.

This still doesn't explain the resonant, bell-like sound in 3 of them.

I like your avatar.

I would suspect that something internal has worn away? Causing the echo effect?

Well, I wish an expert would chime in. I guess they don;t know, either :p