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Author Topic: OMC throttle buzzing when key is turned  (Read 4744 times)

Offline Ellensburg

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OMC throttle buzzing when key is turned
« on: April 12, 2017, 02:58:13 PM »
So i finally got my 150 johnson outboard running today, but now whenever the key is turned, it makes a super loud high pitch buzzing.

From what I've seen, it could be an over heating alarm, but it goes off even after hours of sitting and the motor not even running.

Anyone ran into this before and have any ideas on how to fix this?

Offline Badhabit

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Re: OMC throttle buzzing when key is turned
« Reply #1 on: April 12, 2017, 03:31:57 PM »
Have you checked the oil reservoir to make sure the cap is screwed on tight and the tank full of oil, also check to see if there is a reserve tank on the motor that might need oil as well? As far as I know it is a pressurized system and if not sealed correctly a warning buzzer will sound.

Offline Ellensburg

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Re: OMC throttle buzzing when key is turned
« Reply #2 on: April 17, 2017, 02:20:55 PM »
Have you checked the oil reservoir to make sure the cap is screwed on tight and the tank full of oil, also check to see if there is a reserve tank on the motor that might need oil as well? As far as I know it is a pressurized system and if not sealed correctly a warning buzzer will sound.

Yea Oil is full, but i'll change the lower unit gear oil.


Any other suggestions?

Offline Night goat

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Re: OMC throttle buzzing when key is turned
« Reply #3 on: April 17, 2017, 07:05:47 PM »
What kind of engine? 150 Johnson, assuming that's a two stroke?

That's probably your low oil pressure alarm, for a 4 stroke, it would be crank case oil, not gear oil

Being a two stroke (if it is) you need to figure how to bypass that because on a 4 stroke it would be connected to a sender, but you usually can ground out that circuit or alternatively you could just clip the wire to the buzzer
« Last Edit: April 17, 2017, 07:11:35 PM by Night goat »

Offline Ellensburg

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Re: OMC throttle buzzing when key is turned
« Reply #4 on: April 18, 2017, 01:56:16 PM »
What kind of engine? 150 Johnson, assuming that's a two stroke?

That's probably your low oil pressure alarm, for a 4 stroke, it would be crank case oil, not gear oil

Being a two stroke (if it is) you need to figure how to bypass that because on a 4 stroke it would be connected to a sender, but you usually can ground out that circuit or alternatively you could just clip the wire to the buzzer

yea its a 2 stroke. I have a full oil reservoir that is auto pumped.

Offline Henrydog

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Re: OMC throttle buzzing when key is turned
« Reply #5 on: April 18, 2017, 02:11:47 PM »
If the alarm is a solid buzz, not a beep beep beep it is a overheat alarm.  When was the last time the impellor was changed?

Offline Ellensburg

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Re: OMC throttle buzzing when key is turned
« Reply #6 on: April 18, 2017, 04:31:21 PM »
If the alarm is a solid buzz, not a beep beep beep it is a overheat alarm.  When was the last time the impellor was changed?

Can't be sure. I bought it 2 summers ago and havent changed it myself.

Offline Ellensburg

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Re: OMC throttle buzzing when key is turned
« Reply #7 on: April 18, 2017, 04:40:59 PM »
The alarm goes off even if i havent ran the motor and just turn the key one click to the right.

Offline Henrydog

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Re: OMC throttle buzzing when key is turned
« Reply #8 on: April 19, 2017, 07:18:55 AM »
Only thing I can think of is a bad ground wire

Offline Badhabit

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Re: OMC throttle buzzing when key is turned
« Reply #9 on: April 19, 2017, 01:38:44 PM »
Have you called the OMC help desk? Or do you have the owners manual for your engine? There should be a trouble shooting section and a section that identifies what buzzes and beeps your motor makes for what reason.

Offline Ellensburg

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Re: OMC throttle buzzing when key is turned
« Reply #10 on: April 19, 2017, 03:48:47 PM »
Have you called the OMC help desk? Or do you have the owners manual for your engine? There should be a trouble shooting section and a section that identifies what buzzes and beeps your motor makes for what reason.

good idea

Offline Ellensburg

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Re: OMC throttle buzzing when key is turned
« Reply #11 on: April 19, 2017, 03:50:47 PM »
Have you called the OMC help desk? Or do you have the owners manual for your engine? There should be a trouble shooting section and a section that identifies what buzzes and beeps your motor makes for what reason.

http://www.webmastersinternational.com/bassfish/bassboard/boats_motors/message.html?message_id=160738

is that your post from 1999?

Offline luvmystang67

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Re: OMC throttle buzzing when key is turned
« Reply #12 on: April 19, 2017, 04:04:55 PM »
So, I've actually dealt with this before.  Almost certainly this is an error with your automatic oil pump.  That alarm is to alert you that either your fluid level is low or that your pump isnt working, or maybe in your case it is telling you that the sender that says that you pump is working... isn't working.  My buddy had a late 80s GT150 johnson with the same issue.  We ripped the auto oiler off following some directions online and were able to turn off the alarm and then just premix gas from that point onward.

To each their own, but this is the alarm that was designed to tell you that your oil pump isn't working (so you dont fry your engine). 

Offline Badhabit

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Re: OMC throttle buzzing when key is turned
« Reply #13 on: April 19, 2017, 08:34:30 PM »
OMG times 10. That is why my wife calls me and that boat BADHABIT. In one year I blew three powerheads. I was committed to bass fishing and was fishing a couple tours.  The need for speed ruled. I heard a couple differew beebs and buzzes back then.

Offline Skillet

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Re: OMC throttle buzzing when key is turned
« Reply #14 on: April 19, 2017, 09:00:01 PM »
So, I've actually dealt with this before.  Almost certainly this is an error with your automatic oil pump.  That alarm is to alert you that either your fluid level is low or that your pump isnt working, or maybe in your case it is telling you that the sender that says that you pump is working... isn't working.  My buddy had a late 80s GT150 johnson with the same issue.  We ripped the auto oiler off following some directions online and were able to turn off the alarm and then just premix gas from that point onward.

To each their own, but this is the alarm that was designed to tell you that your oil pump isn't working (so you dont fry your engine).
:yeah:  I think your VRO is suspect.   That's an expensive alarm to ignore.
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