PEUGEOT 306 spark problem

If that is exactly your coil it is impossible for a spark plug not to throw spark unless the coil is bad, because these types of coils work with waste spark, the same coil mandates spark to 2 cylinders that are paired that the pistons rise at the same time but in different race either of compression or escape. I mean that spark jumps in the 2 spark plugs at the same time. If you do not think check it, if your ignition order is 1342 the output of cylinder 1 and 4 throw spark at the same time and if you bring the 2 cables to an inch you will see the spark jump with each other, the same can be done with that of the 2 and 3 cannot jump only to 1 side if the coil is good if it does not throw spark or it is very weakened the coil does not work.

It is true that coil ramp is the one in charge of both cylinders, testing with another coil to see what happens

Hello, the cable that connects the coil with how many volts do you work? I have notice that it brings two blue cables one blacco and one black

Hello friend, as the classmates almost certain the fault is in the coil, try another one that you know is fine, greetings.