I am having trouble finding a problem with my ignition system only giving spark on the front coil. I have tried a new coil and igniter. Having no luck with that I hooked up an o-scope to see that one coil was not getting signal/pluse. I checked the igniter module and it is not getting a signal from the ECU so I disconnected the ECU and igniter to see if the wire was shorted or open. The wire is good.
What all could cause the ECU to send a signal out on one of the spark coils? I replaced the crank and cam position sensors already; but not checked the wires for them. Would the ECU ever have a reason to only ignite one coil?