Secondary ignition waveform looks wrong?
#1
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.
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.
#2
Moderator, Tech Contributor
Member Since: Sep 2013
Location: Cape Coral, Florida
Posts: 9,517
Received 2,122 Likes
on
1,687 Posts
Sorry it took almost a year to respond to this...LOL !!...pretty strange secondary waveform...it’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 Picoscope...as 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 !!