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Loss of horsepower on last trip

Discussion in 'Boat Repairs' started by Laus3, Jun 11, 2016.

  1. Laus3
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    Laus3 Public Relations BBM Staff Member

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    I think i solved the problem but am always welcome for feedback (Kipp lol)... I noticed the spark plug coil that connects to the spark plug had a small cut on the rubber part. My buddy who's a boat mechanic said it was minimal and wrapped it with some kind of paste and electrical tape and said it should be fine... When i took my boat out last weekend, it topped off at 5000 rpm when it normally goes up to 5600-5700 rpm. Felt like it was running on 2 cylinders instead of 3 with loss of horsepower. I was gonna replace the spark plugs and spark plug coil ($97 for the coil) but he told me to start with just replacing the spark plug since it looked like it was going bad and he has seen spark plug connectors look a lot worse than mine looked and still worked fine.

    To make a long story short, I replaced all 3 spark plugs and the motor cranked fine. Also bought Sea Foam in case theres deposits in the carb causing the motor to run sluggish... I'm hoping it was just a bad spark plug but I know i will eventually have to replace that coil. I won't be able to tell until i run her wide open again.

    Any suggestions based on my issue? If you have any other options rather than the route i went, let me know. I'm trouble shooting with the spark plugs 1st, coil, 2nd then thinking it may be the carb if the 1st 2 options don't give me the horsepower back.
     
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  2. gonefishing7903
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    gonefishing7903 New Member's Liason BBM Staff Member

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    always star with the simple stuff first. i change plugs at least once a year, its cheap to do and really keeps things running smoothly
     
  3. Laus3
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    Laus3 Public Relations BBM Staff Member

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    Yeah GF thats the plan. Need to take her out, dump the can of sea foam and see if my Hp and RPM's are back to normal. Hoping the new plugs will fix my issue...
     
  4. Laus3
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    Laus3 Public Relations BBM Staff Member

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    Kipp... Whats your take here? I'm gonna run the boat Saturday and am hoping the spark plug was the problem.
     
  5. OOPSMEN
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    OOPSMEN Active Fisherman

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    Been quite some time haven't read anything if you solved your problem loss of power on the Merc. if so what cured it.
     
  6. Laus3
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    Laus3 Public Relations BBM Staff Member

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    3 new spark plugs did the trick.... Just as i suspected, the culprit was a faulty plug, causing my boat to run on only 2 cylinders instead of 3. Also dumped a bottle of Sea Foam just in case the carbs were dirty but i think the issue was the sparkplug more than anything else. At least i didn't have to buy a new coil, for now at least.
     
  7. OOPSMEN
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    OOPSMEN Active Fisherman

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    Very good, nothing wrong with being lucky.. Plugs vs coil and the plugs win. ;);)
     
  8. Laus3
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    Laus3 Public Relations BBM Staff Member

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    Well the coil was taped back together and sealed where the plug connects to it so it was a quick fix and will need to be replaced... Eventually. But I was able to fix the issue with $21 plug expense rather than an $83 replacement coil.
     
  9. kipp
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    kipp Special Operations BBM Staff Member

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    Sorry I totally missed this Laus..Glad its all back to working order.Bad Plug and coil on any motor will actually act the same..some coils will intermittent slowly go out..Hate those...Just go ahead and go!!And by all means go to where most likely and easiest intersect..lol...like GF and we all know......cool.
    Call or text me next time..or any time...478-335-1073..
     
  10. Laus3
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    Laus3 Public Relations BBM Staff Member

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    Yeah i plan on replacing the coil anyways since my buddy used electrical tape as a quick fix but the spark plug did the trick.
     
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