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98 mercury EFI 200 burnt piston

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  • 98 mercury EFI 200 burnt piston

    Hey guys i have a 98 mercury 200 efi that that burnt/melted cyl #1 piston,other cyls look ok,
    i had ran at 5500 for approx 1 mile when it happened,no alarms & did not seem to overheat,
    melted edges of piston down to rings,any common problems on cyl#1 on these? or any suggestions
    where to look for cause? Also anyone know what the finish # or grit of stones for cyl walls will need
    to be? thanks

  • #2
    Re: 98 mercury EFI 200 burnt piston

    Its common with EFI's. Injector gets plugged and the cylinder goes lean. Have all the injectors cleaned before you get it back together.
    Get something black on the back.

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    • #3
      Re: 98 mercury EFI 200 burnt piston

      Also have the ECU tested, about $225 to test and have injectors cleaned/flowed and balanced by Brucato...
      When in doubt,Trim it out!!!
      Business Owner & Certifed Technician
      Boats I own & use
      20ft Javlin w/250 Junkrude
      17ft Bullet w/200 Merc (SOLD!!)
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      14 x 48 Drifter with 1100SS Merc

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      • #4
        Re: 98 mercury EFI 200 burnt piston

        Originally posted by houndawg View Post
        Also anyone know what the finish # or grit of stones for cyl walls will need
        to be? thanks
        This would be whatever your machine shop does ta fix tha broke hole......You can do like some will suggest and try ta clean it up yourself but you'll be back ta square one sooner or later if not done tha right way....jmo

        Will add besides gettin' tha injectors cleaned you need ta check ALL tha 'lectrics startin' with tha idle stabilizer/control or whatever they called it in '98. Ya check it by "throwin' it away". Yours wouldn't be tha first that its destroyed. They're worthless........
        Last edited by Dukedog; February 26th, 2014, 05:45 AM.

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        • #5
          Sign up today
          Re: 98 mercury EFI 200 burnt piston

          Thanks,injectors headed to get cleaned...

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