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Engine Misfiring

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  • Engine Misfiring

    Lately my 05 ETEC 50HP will not fire on one cylinder after running at speed for a modest period. I found if I idle the engine for a short period, it clears up but will misfire again on one cylinder once I'm back underway. If I keep the RPM at 2000 or less, it runs fine. Bought new plugs, will install tomorrow. My question(s): are we getting too much alcohol in our fuel these days? Should one be putting addditive in fuel to help this situation and if so, what type/brand? Then there's the age old problem of finding a decent marine mechanic anymore to ask a question or even get to work on ones engine. It appears shade tree mechanics are everywhere and ripping owners badly. Doesn't this industry monitor such dealerships/repair shops to ensure quality workmanship or are we just fair game?

  • #2
    New plugs cured my problem.

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    • #3
      Unfortunately the Ethenol is play heck with the fuel systems in the marine industy. Startron is a good additive also stabil. Spark plugs should help if problem persist have a computer download completed. If no codes chances are fuel issue.
      Regards
      Boats.net
      Johnson Outboard Parts

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