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Idle adjustment on 3.0l Mercruiser

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  • Idle adjustment on 3.0l Mercruiser

    Hey guys,

    I was told that adjusting the idle if fairly simple on these boats. It's a 97 Bayliner capri with a 3.0l Mercruiser.

    Right now it idles really rough and am hoping a little adjustment may help that.

  • #2
    Re: Idle adjustment on 3.0l Mercruiser

    The idle speed adj. controls idle speed .what does the tach read now?
    Running rough could be from something else. Last full tune-up?
    NO PERSONAL QUESTIONS, THIS IS WHAT THE FORUM IS FOR.

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    • #3
      Re: Idle adjustment on 3.0l Mercruiser

      I just took it out of the shop yesterday.

      They changed out the water pump, spark plugs, all the fluids, and fired up and ran the motor in their test tank.

      I called the mechanic yesterday and he said there was a screw to adjust the idle.

      When it's in gear, all is well. (most of the time, see my other post)

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      • #4
        Re: Idle adjustment on 3.0l Mercruiser

        sorry,

        The tach was reading approx 600rpm at idle.

        It isn't necessarily the most trustworthy part of the boat though.

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        • #5
          Sign up today
          Re: Idle adjustment on 3.0l Mercruiser

          Could try 650-750 in the water ,in gear .
          The manual is available in the Adults only section,follow the new download specs.
          NO PERSONAL QUESTIONS, THIS IS WHAT THE FORUM IS FOR.

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