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Cylinder 8 Misfire (error msg)

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Had the boat tuned up at the beginning of this season…spark plugs, impeller, oil change. This is my 2nd time out and I’m on a lake trip with family and friends for the week, I brought the boat, and it’s Monday so can’t call the Boat shop that did the work.

Boat feels underpowered and sounds like it’s missing. In inactive Engine Faults, it says:


SPN 1330, FM 1:31 Cyl 8 Misfire

root cause unknown 



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53 minutes ago, Mavrick99 said:

Which one is the #8? 

All of them.  Do the cap end as well. 

  • Haha 1
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We just had that on a new boat during the break-in and dealer replaced the spark plug and it took care of it. Boat felt sluggish for us as well. Maybe it was a bad plug you put in?

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Thanks for replies. Found a local boat repair shop to replace plugs and harness and I’m good to go on that front. 

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