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Was slow trolling at idle speed for 4 hrs, then motor

Customer Question
Was slow trolling at...

Was slow trolling at idle speed for 4 hrs, then motor started to sound a bit rough, so put some lures on and bought it up to 3000rpms

Mechanic's Assistant: Sometimes things that you think will be really complicated end up being easy to fix. The Marine Mechanic I'm going to connect you with knows all the tricks and shortcuts. Tell me a bit more about what's going on so the Marine Mechanic can help you best.

Sorry, then after 20 minutes 3 lights came on.I stopped and let it cool down for 1/2 hour, then restarted but could only do 3500rpm

Mechanic's Assistant: Is there anything else the Marine Mechanic should be aware of?

Coming in after about 20mins the engine revved and the lights went off, but wot was only 5000rpm.checked plugs and top 2 were a bit carboned up.is a 115 tldi

Submitted: 4 months ago.Category: Boat
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3/14/2018
Marine Mechanic: Boat Doc, Boat Enthusiast replied 4 months ago
Boat Doc
Boat Doc, Boat Enthusiast
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Satisfied Customers: 228
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Hi, my name is ***** ***** I'll be assisting you with your boat question. I apologize for the extended wait time you experienced,
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Customer reply replied 4 months ago
I pulled my spark plugs out and the top one was carboned up fairly badly so I think it may have formed a bridge over the gap and caused the alarm. It did not use any excess oil during the incident.I will try motor again in the next day or soand let you know how it went and if I can get a higer wot.
Peter
Marine Mechanic: Boat Doc, Boat Enthusiast replied 4 months ago

That could definitely do it. Let me know what that plug looks like when you get back compared to the others. You may be running rich or be using a little oil.

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