engine miss on a 130

On my last climb out, my engine starting missing.  No loss of power that I could detect, but a clear miss on occasion.  I landed no problem.  I'm not sure where to start looking.  I see on my EIS, there is a nine pin computer plug hanging out.  Does anyone know can I run a diagnostic tool on this?  It would be great to know if one cylinder was missing or random across all. I've left Jan a message, but it's Oshkosh time, so I assume he will be tied up with that for awhile.

Thanks for any advice in advance.

Richard Cooley

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Permalink Reply by Richard Cooley on July 18, 2026 at 6:02pm

Sorry, I meant ECU, not EIS.

Richard

Permalink Reply by Kip Pratt on July 19, 2026 at 5:34am

Not 100% on this but I am pretty sure that is a "Jan only" plug, for him to program and diagnose the ECU.

I would suspect one of the coil is going bad or maybe a connection is loose to one of them.

Keep us updated as to your findings.

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