Starboard Engine Misfiring

[v4tuna]

So my one engine started misfiring would not rev past 7000 rpm. would bog then stall. It would restart but idling like a tractor. Sometimes the power would come back like an electrical short or something as it revd it would smooth out . Back on lift remove and check plugs ....I didnt have new plugs but leftovers from 3 years ago last time I changed . I had to through 4 of those old plugs till i got 4 that worked. It purred for a few minutes Great. turn off motor. Go get fishing gear to go out come back. to poor start rough idle again. I have just bought new plugs for it but suspect maybe ECU is fouling plugs . Am I missing anything If I remove ECU has anyone tried baking in the oven to dry it out before sending for repair I thinking water can cause a short to ground.

 

[Babin Farms]

I would swap ecu’s to see if it follows the ecu or not

 

[JetboatBrad]

I would swap ecu’s to see if it follows the ecu or not

That’s where I would start. What year is it?

 

[v4tuna]

Its a 2005. would fresh plugs run fine for a bit with a bad ecu till plugs foul

 

[JetboatBrad]

How quickly are they fouling out? And are they wet and gummy? I’ve never had an ecu problem so I’m probably not the best. I would think if you swapped ecu’s, put some fresh plugs in it and ran it. It should by process of elimination, tell you what’s going on. If it’s a bad ecu, your other engine will have same problems

 

[v4tuna]

Spark plugs fixed the problem .