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  1. J

    03 mercury optimax 150 overheat questions

    Hello, on the main boat I use all the time I am having overheat issues. If you start out and run at normal planning speed all seems fine. When you let off the throttle and idle for a minute or so and go to pick up speed again, around 1krmp to 2krpm the gaurdian system kicks in and limits power...
  2. J

    99 mercury 150 efi oil questions

    Well, I have a 99 merc 150 efi that I had a hard time getting to run before, now that is cleared up now the engine smokes like crazy. Gives off a lot of oil when running into a bucket. I have noticed when I take the air plate off at the intake there is oil that wants to accumulate at the bottom...
  3. J

    1999 mercury efi 150 wont stay running

    Hello, I have a 1999 mercury 150hp efi outboard that I am having some issues with. It is pretty hard to get starter, I feel it takes excessive cranking to get going. Once it starts you can turn it off and it will start right up like an efi should. If I let the engine warm up a little more it...
  4. J

    90's EFI oil pump questions

    Hello, I am trying to put together a 90's style mercury 150 efi engine and trying to figure out how the oil pump lines should be routed. This unit has a mechanical oil pump. I know I could just bypass it and just premix the gas but it works and was going to just hook it up the way it was...
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