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  1. #1

    Default 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. #2
    Fleet Admiral
    Join Date
    Aug 2004
    Location
    East coast NJ
    Posts
    8,169

    Default 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?

  3. #3

    Default 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)

  4. #4

    Default 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.

  5. #5
    Fleet Admiral
    Join Date
    Aug 2004
    Location
    East coast NJ
    Posts
    8,169

    Default 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.

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