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Cars used to have one coil for the whole engine and the wires for the different cylinders came off of that. Now they seem to mostly have one for each cylinder. More parts to replace as they age. They seemed to work just fine before with the one coil, but now they can make more money off parts.
The coils take the low voltage 12 volts from the battery and turn them into thousands of volts to send to the spark plug. They call them coils because the wires inside are all coiled up. Like in a wall wart.
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