DIAGNOSIS AND TEST OF A FAULTY COIL.
Most suspected faulty coils can only be tested and diagnosed with specialist test equipment, anybody without this equipment would have to start with the basics such as.
Checking for external HT leaks.
Checking for corrosion on terminals.
The most common failing point is when the internal insulation fails causing leakage between the primary and secondary coils again without specialist test equipment this is almost impossible to detect.
It is worth noting, that as the coil is controlled by the ECU (Electronic Control Unit) any failure of the coil can result in failure of the ECU (Electronic Control Unit) and can also cause the element within the AFM (Air flow Meter) to burn out.
Where more than one coil is fitted to a vehicle, it is recommended that all are changed. This is due to a simple fact that they have all done the same work, therefore if one has failed any others fitted are likely to fail (replace one at your own risk).
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O.E.M. names and numbers are for reference purpose only