Long Tail Wasted Spark waveform?

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AlexMpico
OneWave
OneWave
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Joined: Sun Jul 08, 2018 8:49 am

Long Tail Wasted Spark waveform?

Post by AlexMpico »

Hi, Any suggestions on what might be causing the very long negative tail on the wasted spark portion of the 0004 cylinder. I've included the 0001 companion cylinder waveform which doesn't indicate a reason to me. No misfires evident. This is a 1990 Miata NA 1.6lt 4cyl with new plugs and wires, but long tail was evident in previous waveforms before new parts.
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20201101-0004.psdata
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