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Secondary ignition waveform looks wrong?

Old 07-08-2018, 06:53 AM
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Default Secondary ignition waveform looks wrong?

Hi all.
2005 C6 LS2 stock apart from Corsa touring catback.
I'm trying to track down a random misfire under load on most cylinders.
I have changed the plugs and plug cables OEM.
I put the oscilloscope on the plug wire expecting to see a normal secondary ignition waveform, but what i got is a very strange looking waveform that iv never seen before, iv attached a screenshot below.
Does anyone have any ideas what may be wrong here?
I get the same result on other cylinders as well.

Last edited by mazzerman; 07-08-2018 at 06:54 AM.
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Old 06-25-2019, 09:01 PM
C5 Diag
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Sorry it took almost a year to respond to this...LOL !!...pretty strange secondary’s not inverted but if you are using a capacitive probe for some reason they don’t work well on the “coil near plug but might have to be play with the setting !!...a COP probe works MUCH better...these are my secondary waveforms using my you can see the COP probe gives a much better waveform...the “burn line” is between 2.5-2.8 ms...firing Kv almost 25 !!

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