View Full Version : 2003 Utopia - 250 Optimax steady warning beep

07-02-08, 05:31 PM
My 250 Optimax has been running great this year but this last weekend a steady warning horn has started to go off. It started after a water hose clamp came loose and quite a bit of water collected in the bilge but not enough to reach the engine itself. I fixed the hose clamp which fixed the water in the bilge problem but soon after an alarm started to sound.

It happens when the engine revs over 4000 rpm for a few minutes. If I throttle back to idle and then throttle up the beep goes off, if I keep the revs below 4000 rpm the beep never sounds. The oil warning light on the dash does not light.

A couple of other factors:

I put a can of SeaFoam engine treatment in the gas tank.
I topped up my oil tank with Optimax 2 stroke oil, it had Quicksilver Premium Plus in there but according to the Mercury site its OK to mix those brands.

Does anyone have any insight into what the warning horn indicates? I don't think it is overheating since I can run for long periods without problems as long I stay under 4000 rpm.

Thanks in advance for you help.

07-29-08, 05:32 PM
I have the same boat and the same problem, did you fix it yet? I noticed when the beeping starts if I use any accessories, my spedometer jumps, which leads me to think it may be an electrical problem. Can anyone help?

I man
08-08-08, 11:49 PM
check the water seperator. i had a continuos beeping and a Merc mechanic told me that it indivacted too much water in the filter. emptied it and fixed the problem.

08-12-08, 07:37 AM
I was wondering if your problem is fixed. I have the same issue and my boat is at the 5th mechanic!! The motor is an 04 Optimax 90HP. If I go past 4000 rpm its starts beeping steadily. Then if you bring it down in speed it goes away. I have replaced the Throttle position sensor, water pump, and crank shaft sensor. NOTHING has fixed it. They say it might be a coil or the spark plugs. Please help!!!

08-27-08, 10:13 PM
Don't know if this applies to your Optimax 250, but my 200-240efi jet drive manual says that a continuous warning signal can only be:

1. cooling system problem: power limit will vary with level of overheat
2. critically low oil level: guardian system will only allow a fast idle
3. oil pump failure: only allows a fast idle
4. sensor out of range: power limit may activate at full throttle

It says a low oil reserve, and a full water separator are the only 2 conditions where the alarm is 4 beeps every 2 minutes.

Also, this Engine Guardian System will reset itself if you move the throttle back to idle position. Sounds like you have a bad sensor.


08-28-08, 01:17 PM
Do you have that manual in PDF form? I've done many searches for that PDF, it would be good to get it into our archives on this forum.


08-28-08, 01:26 PM
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