Quote:
Originally Posted by jeremyc74
It sits on top of the spark plug, and it takes the 13.5VDC from the vehicle's electrical system and on command from the ECU it converts it into a high voltage pulse that's feed to the spark plug, creating the spark that ignites the fuel in the cylinder.
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Oh ok. I see. Something that just came to my mind is the fact that sometimes, I would notice slight vibrations from the car while waiting at lights. It didn't happen all the time, just some times and it felt like the car was shaking slightly. I just thought it was in my head or something. Couldn't this mean that if the coils were going bad and not properly feeding the spark plugs, that cylinders would misfire causing these slight shakes I was experiencing? I'll call BMW to see if they checked the coils and spark plugs. My guess they would check something like that first, but who knows.