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At the factory, three of the injectors had reverse polarity put to them (why I dont know). This happened to 3 thousand engines or so. The "flame jobs" so far, amounts to that one in the video (it had the end broken off the injector, dumping raw fuel uncontrollably). So far, other than fuel leaks causing fires, I dont know of any more flamethrowers (although several hundred have been rumored). The piezo injectors that were affected, supposedly have less fuel flow, causing rough running (the one I'm doing runs smooth).
No, the piezo part is just like ceramic discs that deform when power is put to them. That deformation is what moves the mushroom valve inside the injector allowing fuel flow to the nozzle. The reverse polarity may reduce the deformation, not allowing full fuel flow. The important part is for the tech to change each individual fuel line every time the line is loosened or injector is replaced.
