If you suspect a faulty ignition coil, you’ll first need to test it. “Testing ignition coils is a straightforward and fairly easy DIY,” says Aaron Turpen, an automotive expert at Car Talk.

Here’s the ignition module in my hand, and the heat sink. Note that this unit apparently had heat sink compound applied at the factory (unless someone did the maintenance, which I highly doubt).I’ve ...

The module is also specialized for racing. The ignition module is the equivalent of the system's brain. It controls the current sent to the coil.