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I have a 2007 Mercury 90hp 4 stroke. Yesterday it gave me…

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I have a 2007...

I have a 2007 Mercury 90hp 4 stroke. Yesterday it gave me two brief alarms when backing off of the throttle. Today, after cruising at 3000 rpm for about half an hour, I idled about for several minutes, then tried to throttle back up to 3000 rpm. An audible alarm sounded at 2000 rpm and cleared at 1200 rpm. The max it would run at was 1600 rpm. I stopped, pulled the prop to make sure it wasn't spun (it wasn't) and was underway in just a few minutes. The engine ran easily at 5000 rpm. Water always comes out of telltale pronto. I'm confused. Thanks.

Mechanic's Assistant: Sometimes things that you think will be really complicated end up being easy to fix. The Marine Mechanic I'm going to connect you with knows all the tricks and shortcuts. Is there anything else the Marine Mechanic should be aware of?

I think that's it.

Submitted: 11 months ago.Category: Boat
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Answered in 3 minutes by:
8/2/2017
Marine Mechanic: Charles, Marine Mechanic replied 11 months ago
Charles
Charles, Marine Mechanic
Category: Boat
Satisfied Customers: 4,737
Experience: US Navy (Ret) Certified Mercury Marine Tech with over a decade of repair experience.
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Hello, my name is***** will assist you.

Do you have SmartCraft gauges on the boat?

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Customer reply replied 11 months ago
No temp gauge. Just voltage.
Marine Mechanic: Charles, Marine Mechanic replied 11 months ago

Was the alarm a solid tone or a rapid beeping one?

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Customer reply replied 11 months ago
Solid tone
Marine Mechanic: Charles, Marine Mechanic replied 11 months ago

Ok, solid tone is for overheat, and a few other items. When was the last time that a water pump impeller was installed into the engine?

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