I recently bought a set of 8 42lb/hr injectors from the classifieds and i tried testing them with a 9v battery and only one of eight would open. The other seven didn't do anything.. I have another set of 42lbers that i did the same test with and all eight clicked open when current was applied. I ohm tested both sets of injectors and they all specd out at 17ohms which is exactly where they are supposed to be. My question is if they ohmed out fine but wont open are they garbage? should also add that on the seven that don't work, when i appied current to the positive and negative pins there was a spark on the battery like something was shorted.