2004 Sea Doo Islandia Mercury 240 EFI Engine trouble

[LBI752]

I am new to the forum and have a question about a problem I am having with my Islandia which has a merc 240 efi engine. The boat starts up and runs fine at low speed. If I throttle past half throttle, the engine loses power and the solid alarm comes on until I pull throttle back. The alarm then turns off. I can then run it at slow speed.

Any suggestions to what could be causing this would be appreciated. I am having trouble finding a mechanic to look at it in my area.

Thank you,

Rob.

 

[Dr Honda]

A solid alarm is over temp. I would make sure that the water is flowing out the pee hole.

 

[Coastiejoe]

I need to get into the manual, but in most cases, a constant alarm is "normally" and overheat alarm. In the mean time, if [MENTION=16022]Dr Honda[/MENTION] is around, he will likely know off the top of his head. He is our resident Merc man,,,

 

[Coastiejoe]

Here are the alarms for the 240 engine,, I assumed it would be an overheat, that is the norm for a continuos tone. It does state that the Guardian is suppose to reduce the engine speed with overheat alarm.

 

[Coastiejoe]

Double post,,

 

[LBI752]

A solid alarm is over temp. I would make sure that the water is flowing out the pee hole.

Thank you for responding. I will check to make sure water is flowing from hole. If it isn't, do you know what would be the cause?

Thanks again,

Rob.

 

[LBI752]

Thank you for posting the alarm list.

Rob.

 

[captain scale]

Check for caked up holes from mudd dobber wasps! Flush the engine on the trailer and be sure cooling water exits properly. Check cooling lines for kinks etc.

 

[Dr Honda]

Yep... what he said.


I would start with a flush, using a hose with GOOD pressure an volume. It could be as simple as some sea grass in the intake.