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Example of sparkplug causing intermittent misfire (Read 113 times)

James H

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Example of sparkplug causing intermittent misfire
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.

Pri_Ign_V_1_2_3_4.psdata (22274 KB | )

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Dave Thomas Senior Member Picogroup Offline I'm an Autonerd Posts: 128 Duson Louisiana USA Gender:	Re: Example of sparkplug causing intermittent misfire Reply #1 - 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.
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Sam M. Senior Member Picogroup Offline I'm an Autonerd Posts: 239 Chicago Illinois USA Gender:	Re: Example of sparkplug causing intermittent misfire Reply #2 - Dec 1^st, 2022 at 2:32am Awesome find James, thank you for sharing the trace
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