My vehicle has LPG as alternative fuel. It have OMVL REG injectors without temp sensors.

It has already ~ 60000 km (In picture you can see, that one injector not used; 3 from left). Check engine light start coming on, and i cannot anymore adjust calibration for LPG and i bought new LPG injectors. After that i disassemble old one. In picture no 1, injector with number 3 was not used. Only moving part of injector are in my fingers in picture no 2. It one side is spring and another side is rubber. In picture no 4 it is just electromagnet.

So, in picture 1, all rubbers looks identical in its thickness (injector no 3 not used at all). What part can be run out in this setup ? Electromagnet? That part witch is in my fingers in picture no 2?

Pic no 1.

Pic no 2.
Pic no 3.
Pic no 4.