I installed the promaster E coil today so i dont have to worry about leaks and it makes a loud buzzing sound. Anyone know why? Is this normal? I have it mounted under my dash and it makes way too much noise.
Buzzing from a transformer is typically from loose segments in the core. A lot of E-core transformer cores are made up of thin plates, if these don't get bonded together in the manufacturing process they can vibrate as a result of the rising an falling magnetic field causing the buzz.
When you have the buzzing the magnetic coupling between the primary and secondary is not as good and you loose some efficiency. In the case of a ignition coil it won't work as well at high rpm.
