Mercruiser 3.0 idles at 400-500 at idle

[ScAndal]

I have a mercarb with 1 idle adjustment screw and I have adjusted it so that it runs decent at idle, but it shakes a bit and sometimes will die.

I have the seloc manual but can't find out how to get the rpm's up to around 600.

Any help would be appreciated.

ScAndal

 

[tommays]

Re: Mercruiser 3.0 idles at 400-500 at idle

Dont know which year you have BUT if you follow the cable going to the carb there is a different screw that adjusts the idle speed very close to were the cable hooks up to the carb


Tommays

 

[Don S]

Re: Mercruiser 3.0 idles at 400-500 at idle

I would also be wondering WHY your rpm is that low to begin with? ? ? ? ? Have you done a tuneup lately? Did you set the dwell/gap on the points? If so did you reset the timing? What year is your engine? 600 rpm idle is still low.