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Honda 225 drops to idle and solid alarm at 3400rpm or more

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Honda 225 drops to idle and solid alarm at 3400rpm or more

Old 04-29-2018, 12:43 PM
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Default Honda 225 drops to idle and solid alarm at 3400rpm or more

Was out fishing and was coming in at about 35 mph when the alarm sounded solid and the motor dropped to idle. I shut the motor off, waited then restarted just fine. Started again and it seems that if i run over about 3400 rpm it happens. Thinking it was an over heat alarm, i replaced both thermostats. But tested it today with same results. Motor has 330 hours on it.

Thank you in advance.
Old 04-29-2018, 12:46 PM
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Does the oil pressure light stay green? When did you last change the impeller?

Last edited by metalchicken; 04-29-2018 at 12:51 PM.
Old 04-29-2018, 12:46 PM
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Fuel issue. Change out fuel filters first. Might also have a fuel pump issue but I’d start with filters first.
Old 04-29-2018, 12:54 PM
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Originally Posted by Reeleyez View Post
Fuel issue. Change out fuel filters first. Might also have a fuel pump issue but I’d start with filters first.
Solid beep alarm is overheat.

(Fuel issue is one second on - one second off beep accompanied by the check engine light)
Old 04-29-2018, 12:55 PM
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My info center doesnt have lights. just the Honda gauges. I have replaced the external fuel water seperator and the low pressure about 5 hours ago. I still need to do high pressure. I will do that now.

I changed the impeller about a year ago (100 hours+/-) I've read different things about impeller changing intervals. But its only $50 for the kit so can try that too.

Thanks.
Old 04-29-2018, 12:56 PM
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I'm getting good water on tell tail. Not hot either.
Old 04-29-2018, 01:00 PM
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If it's a solid alarm and it dropped into limp mode it's unlikely to be fuel - but you should change both high and low pressure fuel filters every year. Check the impeller and its housing and for crud in the lower unit intakes.

If you have a Honda keyswitch it should have two small lights, green that stays on unless your oil pressure drops and a red which is the overheat). Oh and I believe that the engine does not drop to idle on fuel issues - only overheat and oil pressure.

Actually... check the water separator on the engine (next to the low pressure fuel filter) - this can also give a continuous alarm but will not drop the engine to idle.

Last edited by metalchicken; 04-29-2018 at 01:31 PM.
Old 04-29-2018, 04:43 PM
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Just got done checking water pump. Everything looked good. Also replaced high pressure fuel filter. Tried to get it to happen here at the house but it wouldn't trip. guess I'll have to take to the lake to try it.

Thanks for all you your input on this issue. Hopefully I won't have to take it to the dealer.
Old 05-12-2018, 10:39 AM
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***UPDATE***
So I replaced HP fuel pump with no results.
Cleaned the coolant tubes coming from the exhaust manifold no results
Checked both relief valves and they looked good.
Replaced both heat sensors No results
Ran a pressure test on fuel pump . 43 psi so good there.

Then I read on another forum that the O2 sensor could be bad causing the motor to dump too much fuel in the cylinders. that made me think. I did notice more than usual soot on the exhaust and foot area than usual. I was my boat after every use so that stood out. And then notice that the exhaust smelled rich.

So I put in a new O2 sensor and changed the oil. Oil smelled like it had gas in it and was darker than it should be for 5 hours on it.

Just did a lake run 10 miles 5k RPM. No alarm.

So hopefully my problem can help someone else.

Thanks for all of the help.
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Old 05-12-2018, 02:11 PM
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Let's see how that goes.... Hopefully you're sorted.
But I've never heard of an O2 sensor causing the motor to drop into idle and give a solid alarm - according to the shop manual (and my experience) it gives a one second alterating alarm and does not drop into limp mode. The engine doors run a bit rich though.
I still suspect there's something else going on but for now this is good!
Old 05-12-2018, 05:06 PM
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Had the same experience. Replaced thermostats, problem solved.
Old 05-12-2018, 11:26 PM
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Originally Posted by mrfishness View Post
Had the same experience. Replaced thermostats, problem solved.
Yes absolutely.... I thought he'd done the thermostats.... They should definitely be changed if and when the solid beep alarm come back.
Old 05-13-2018, 07:46 AM
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Same thing on mine, changing O2 sensors solved it.
Old 05-15-2018, 09:33 PM
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yes, i did change t-stats. then ran it and the alarm still sounded. Sorry I forgot to add to my long list of things.
Old 05-24-2018, 10:47 AM
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Ok, so I took the boat out again and got the same alarm (Metalchicken was right). So I bought a HDS kit and hooked it up. In the picture here its showing my high pressure oil sensor is off. Is this normal or is this sensor broken? I hope to get a definite answer before tearing into the motor to replace it. It looks like a pretty serious job but I have the Honda manual that pretty much walks you through it. What is also weird, is when I run the boat with the HDS hooked up and the alarm buzzes, the dot above the oil sensor goes away but the HDS doesn't report a fault code.

Any help with this is greatly appreciated.

Thanks

Cant post until I have 10 posts.
Old 05-24-2018, 10:47 AM
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I need to make 3 more post to post a picture. sorry
Old 05-24-2018, 10:48 AM
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Almost there
Old 05-24-2018, 10:49 AM
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Hopefully only one more needed
Old 05-24-2018, 10:49 AM
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Here is the screen shot of HDS running
Old 05-24-2018, 03:51 PM
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Ok, sorry to hear your alarm didn't go away.

At this point I suggest you heaf over to the Honda marine engine forum. There are guys on there who really know their stuff and will hopefully be able to help you fix this.

http://www.marineengine.com/boat-forum/forumdisplay.php?21-Honda-Outboard-Forum

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