2000 Mercruiser 5.0 Thunderbolt 5 ignition idle issue.

[Yannih]

G'Day all,

I have a 2000 Sea Ray 190 CC with a Mercruiser 5.0 Thunderbolt 5 ignition engine.
I am having idle issues where the engine idles okay for approximately 1-2 minutes then slowly reduces rpm till it stalls.
I have adjusted the idle rpm adjustment screw with no joy.

Any idea's?

Thanks heap...

 

[scoflaw]

Probably a fuel issue

 

[Yannih]

Well here's the thing.
When I had the idle issue it was cold. About 0 degrees celsius.
Ran the boat again today and it was much warmer at 12 degrees celsius with no issue at all with idle.
Is that standard with the setup I have that it doesn't like cold weather?

 

[scoflaw]

Carbs do ice up

 

[Yannih]

Agreed, but can anything be done about it to stop the issue?

 

[scoflaw]

When it ices up you can turn the engine off and the engine heat rising up will cure it. Then you should be good to go after that, that was my method for the old cars.

 

[Yannih]

I'll give it a try.
Thanks very much...

 

[Scott215]

What kind of carb

 

[Yannih]

This is the engine I have.
It's a 2000 model.
Unsure which carb it has.