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Interference caused by a bad secondary ignition coils ground.
Posted to the Waveform Library on 2/10/2015

had several problem at the same time with this car, (came from a used car dealership). Got hard 2B0B and 2B06. I scoped the 2 potentiometers, 5v and ground of The ET-B. Later I found that these erratic spikes were in fact noise.

Vincent from Quebec