I have to look back and see the faults with the solenoids. But I have just installed the new one I got last week, Cold start, sounded and felt alot smoother then beforehand, and idle sounded alot nicer. Only ran the car for 30 seconds tho to make sure it still started. Will be seeing how it goes properly on the trip home from work. As for my old solenoid, (Don't know if being able to do this is bad or not) But I blew through the old one and could do so easily, the new one before installing it, I couldn't blow through at all. Hope this helps a bit. Will update more after I have run it home.