The spring puts tension on the gears so it will not operate completely with a faulty spring. Mine just came off so I just had to put it back on the right way. I don't think I've had any problems with it? No CEL anyways but I still get shitty intown driving but highway is still pretty decent.
SVT Squad #227 || Build # 1329 of 1978 || FF ROTM Oct. 2006