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Ignition Primary Voltage and Current (Read 242 times)

James H Senior Member Picogroup Offline Bike Nerd Posts: 165 Waterloo Ontario Canada Gender:	Ignition Primary Voltage and Current Aug 4^th, 2021 at 8:57am This is a 4 cylinder Honda with an intermittent miss on Cyl 3. It uses Cop ignition coils. This appears to be a coil problem. Am I wrong here? Should not the current waveform loo different?
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Spence LSD Guide Picogroup Offline Posts: 8,025 Jeffersonville Pennsylvania USA Gender:	Re: Ignition Primary Voltage and Current Reply #1 - Aug 4^th, 2021 at 9:30am You are correct that is a bad coil or connection. There is arcing going on there. Is this bolted directly to the spark plug or is a spark plug wire employed?
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James H Senior Member Picogroup Offline Bike Nerd Posts: 165 Waterloo Ontario Canada Gender:	Re: Ignition Primary Voltage and Current Reply #2 - Aug 4^th, 2021 at 9:33am Hi Spence, hope everything is well and thanks for responding. This as a COP coil and sits directly on the sparkplug. If it is a shorted COP, shouldn't I see something amiss in the current ramp?
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HarleyMike

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Re: Ignition Primary Voltage and Current
Reply #3 - Aug 4^th, 2021 at 11:35am

I read this post, it reminded me of the "Bad spark Plug" post I did. I also updated it today with a video of the spark plug.

My primary current "looked" normal also.

My capture was of the secondary ignition vs current, I didnt have the hash at the end of the current ramp either.

Link
https://www.autonerdz.com/cgi/yabb2/YaBB.pl?num=1606333922

~DatSoon Tech.~ Carter's Diagnostics on YouTube

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Spence

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Re: Ignition Primary Voltage and Current
Reply #4 - Aug 4^th, 2021 at 2:17pm

James H wrote on Aug 4^th, 2021 at 9:33am:

Hi Spence, hope everything is well and thanks for responding. This as a COP coil and sits directly on the sparkplug. If it is a shorted COP, shouldn't I see something amiss in the current ramp?

It's on the secondary side. I believe you will find it is arcing during the beginning of firing.

It could be at the plug as well.

Please keep us up to date on your findings.

Next how have ya been? Haven't talked to ya in a while.

N.B.S. Dilly Dilly! FJB

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James H

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Re: Ignition Primary Voltage and Current
Reply #5 - Aug 5^th, 2021 at 1:50pm

Great info guys, thanks. I will let you know what I find when I get back on it in a couple of days

Yeah, haven't been on here much Spence, been crazy busy since Covid hit....who knew. Also picked up a CNC Mill so been learning that as well a a CAD program so lots on my plate but been using the Pico a fair amount. How have things been with you?

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James H Senior Member Picogroup Offline Bike Nerd Posts: 165 Waterloo Ontario Canada Gender:	Re: Ignition Primary Voltage and Current Reply #6 - Aug 17^th, 2021 at 4:31am A follow up. That was indeed a defective iridium spark plug. Brand new too and a very intermittent problem. Thanks to both of you for the input.
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