Driving it off the cliff

[ike84]

Looking at that chart I can count 6 blue spikes where there should not be (albeit small ones) while there are no abberant red apikes. Does that indicate spark plug voltage when there shouldn't be? Like a short in the wiring?

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[blue62]

I have ZERO knowledge on reading Oscilloscope waveform so I do not even know what to look for.

[blue62]

Originally Posted by ike84

Looking at that chart I can count 6 blue spikes where there should not be (albeit small ones) while there are no abberant red apikes. Does that indicate spark plug voltage when there shouldn't be? Like a short in the wiring?

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I enlarged to about 300% I now see the small spikes on the blue line Channel A=Cyl 1
I know nothing about scope waveform, but Channel B be is not doing it.
But where he is hooked up shouldn't that be signal from the DME/ECU to the coil ?????
Not the plug firing????