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https://yabb.autonerdz.com/cgi/yabb2//YaBB.pl Picogroup Area (contact administrator for access) >> Picogroup Motorcycle Discussion >> Ignition Primary Voltage and Current https://yabb.autonerdz.com/cgi/yabb2//YaBB.pl?num=1628096234 Message started by James H on Aug 4^th, 2021 at 8:57am

Title: Ignition Primary Voltage and Current
Post by James H on 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?

Ign_Pri_V__Ign_Pri_C__Inj_V__FLS_Ex.jpg (101 KB | )

Title: Re: Ignition Primary Voltage and Current
Post by Spence on 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?

Title: Re: Ignition Primary Voltage and Current
Post by James H 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?

Title: Re: Ignition Primary Voltage and Current
Post by HarleyMike on 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

Title: Re: Ignition Primary Voltage and Current
Post by Spence on 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.

Title: Re: Ignition Primary Voltage and Current
Post by James H on 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?

Title: Re: Ignition Primary Voltage and Current
Post by James H on 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.