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https://yabb.autonerdz.com/cgi/yabb2//YaBB.pl Picogroup Area (contact administrator for access) >> Picogroup Motorcycle Discussion >> Example of sparkplug causing intermittent misfire https://yabb.autonerdz.com/cgi/yabb2//YaBB.pl?num=1669852489 Message started by James H on Nov 30^th, 2022 at 3:54pm

Title: Example of sparkplug causing intermittent misfire
Post by James H on Nov 30^th, 2022 at 3:54pm

Honda CBR1000RRR. Customer complaint was a very intermittent miss at idle. If you look at Cyl 3 Green trace of the Ignition Coil Primary Voltage you can see that the spark never jumped the gap. Turned out it was a defective sparkplug. No obvious signs of damage of the plug and unusual as all the sparkplugs had been recently replaced. New plug solved the issue.

https://yabb.autonerdz.com/cgi/yabb2//YaBB.pl?action=downloadfile;file=Pri_Ign_V_1_2_3_4.psdata (22274 KB | )

Title: Re: Example of sparkplug causing intermittent misfire
Post by Dave Thomas on Nov 30^th, 2022 at 5:09pm

I have seen that before on cars and that is where it's nice to have a scope. You know you found the problem and not just throwing parts at it to try.

Title: Re: Example of sparkplug causing intermittent misfire
Post by Sam M. on Dec 1^st, 2022 at 2:32am

Awesome find James, thank you for sharing the trace