Idle adjustment on 3.0l Mercruiser

[joshmason]

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.

 

[Bt Doctur]

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?

 

[joshmason]

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)

 

[joshmason]

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.

 

[Bt Doctur]

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.