coil
not sure on XJ's pre coil pack but I would be checking the voltage to the coil to see what it has. Most single coil distributor ignitions have a coil that works on 8 volts approx. They use a resistor or resistor wire to drop the voltage to the coil.
When you go to start the car the battery voltage drops to about 10 Volts as it's cranking and the resistor feed to the coil is bypassed so you get the 10 Volt battery feed direct to the 8 volt coil giving good spark to fire. Once you stop cranking the coil gets the 8 volt resistor feed. If the coil gets full battery voltage
continually it eventually burns out.
Hope this makes sense and helps out, short of all that I see no reason for the coils to fail other than cheap and nasty parts!!
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