evinrude 50HP keeps going into safe mode at full throttle

teampbc

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I have a 1996 Evinrude 50HP that will not go full throttle. I can go ¼ throttle with out a problem but as soon as I go full throttle I get one beep on the warning sound indicator and the motor goes into safe mode. I replaced the impeller and the VRO pump without any luck. Can anybody tell me what can be causing this?
 

Johnnie

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Re: evinrude 50HP keeps going into safe mode at full throttle

I read one of the articles here on the site, and some guy was talking about a faulty thermostat. Possibly what your problem is- don't know for sure. Let me know if it solves your problem because I may have the same.<br /><br />Johnnie<br />KPIO13@DWAVE.NET
 

R.Johnson

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Re: evinrude 50HP keeps going into safe mode at full throttle

When you say safe mode, do you mean SLOW?
 

teampbc

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Re: evinrude 50HP keeps going into safe mode at full throttle

Originally posted by R.Johnson:<br /> When you say safe mode, do you mean SLOW?
yes, and the only way to reset it is to turn-off the motor and restart it.
 

teampbc

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Re: evinrude 50HP keeps going into safe mode at full throttle

Originally posted by Johnnie:<br /> I read one of the articles here on the site, and some guy was talking about a faulty thermostat. Possibly what your problem is- don't know for sure. Let me know if it solves your problem because I may have the same.<br /><br />Johnnie<br />KPIO13@DWAVE.NET
I replaced that as well and that wasn't it, I was thinking about the heat sensor. Is there a way to test it?
 

R.Johnson

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Re: evinrude 50HP keeps going into safe mode at full throttle

At the top of the cylinder heat, there is a heat sensor with a tan wire. Disconnect this wire, and see what happens. At the same time disconnect the sender from the VRO.
 

umblecumbuz

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Re: evinrude 50HP keeps going into safe mode at full throttle

VRO? <br /><br />Have you checked the reliability of your oil delivery?
 

teampbc

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Re: evinrude 50HP keeps going into safe mode at full throttle

Originally posted by R.Johnson:<br /> At the top of the cylinder heat, there is a heat sensor with a tan wire. Disconnect this wire, and see what happens. At the same time disconnect the sender from the VRO.
I dsconnected that wire and it still had the problem, but I didn't disconnect the VRO wire. I can try that tonight. The brown wire by the releys on the linkage side when disconnected stoped the motor from going in slow but I don't know where or what that wire is coming from.
 

teampbc

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Re: evinrude 50HP keeps going into safe mode at full throttle

Originally posted by Stillfishing:<br /> VRO? <br /><br />Have you checked the reliability of your oil delivery?
When I pulled the plugs they had a fare amount of oil on them and the motor apears to be geting oil by the amount of blue smoke in the exhaust.
 

Blueclaw

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Re: evinrude 50HP keeps going into safe mode at full throttle

look at the powerpack and trace the tan wire back to the connector This wire activates the slow/safe mode in the pack.<br /><br />Look at the tan wire that comes out of the temp switch that R.Johnson describes. Make sure this wire isn't routed next to a spark plug wire. They can trigger the pack into slow mode. By disconnecting the temp switch should keep it from going into slow mode. If it doesn't look at the wire insulation on the tan wire to make sure there are no bare spots allowing this wire to ground out
 

R.Johnson

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Re: evinrude 50HP keeps going into safe mode at full throttle

Disconnect the engine harness 6 wire connector, there is a tan wire going to this. Disconnect the tan wire to the temp. sender on the head. There is a blocking diode between these two points. With an ohm meter, ckeck the continuity between these two points. There should be continuity in one direction, but not the other. The diode is located 10 1/2 inchs' from the 6 wire connector. Here is what the OMC manual say's about this. If the engine goes into SLOW repeatedly, or into Slow without a warning signal, check the diode. I think that discribes your problem. If it were a power pak problem, it would not go away by disconnecting the sensors. Let us know what you find.
 

Cricket Too

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Re: evinrude 50HP keeps going into safe mode at full throttle

teampbc.....When you say you get one beep, do you mean one short beep or one continuous beep or horn? One short beep is just low oil in the resevoir, if you were low enough it would also sound the oil restriction tone and probably throw you into SLOW. I know it's pretty simple but have you checked the oil level in the resevoir?
 

teampbc

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Re: evinrude 50HP keeps going into safe mode at full throttle

Originally posted by Cricket Too:<br /> teampbc.....When you say you get one beep, do you mean one short beep or one continuous beep or horn? One short beep is just low oil in the resevoir, if you were low enough it would also sound the oil restriction tone and probably throw you into SLOW. I know it's pretty simple but have you checked the oil level in the resevoir?
The oil is full to about 1 1/2 inch from the top of the oil tank. most of the time its one beep but I have had it as long as 2 sec.
 

teampbc

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Re: evinrude 50HP keeps going into safe mode at full throttle

Originally posted by R.Johnson:<br /> Disconnect the engine harness 6 wire connector, there is a tan wire going to this. Disconnect the tan wire to the temp. sender on the head. There is a blocking diode between these two points. With an ohm meter, ckeck the continuity between these two points. There should be continuity in one direction, but not the other. The diode is located 10 1/2 inchs' from the 6 wire connector. Here is what the OMC manual say's about this. If the engine goes into SLOW repeatedly, or into Slow without a warning signal, check the diode. I think that discribes your problem. If it were a power pak problem, it would not go away by disconnecting the sensors. Let us know what you find.
Now I can’t get the motor to repeat the problem unless it’s in the water under load.<br />Can this mean anything? Also the problem seems to be intermittent when off the water. When I disconnect the temp sensor on the cylinder head do I also have to disconnect the wire from the VRO pump? Because I only disconnected the temp sensor and that didn’t stop the problem.
 

R.Johnson

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Re: evinrude 50HP keeps going into safe mode at full throttle

Did you try testing the diode. The problem would show up more on the water, as the engine must hit 2500 RPM to go into SLOW.
 

teampbc

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Re: evinrude 50HP keeps going into safe mode at full throttle

Not yet, I will test tonight. I will let you know what happens. thanks.
 

Blueclaw

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Re: evinrude 50HP keeps going into safe mode at full throttle

did you recently replace the spark plugs? did you use "Q" style suppressor plugs and not just resistor type plugs? regular resistor plugs can trigger the slow mode also.
 

teampbc

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Re: evinrude 50HP keeps going into safe mode at full throttle

Originally posted by Blueclaw:<br /> did you recently replace the spark plugs? did you use "Q" style suppressor plugs and not just resistor type plugs? regular resistor plugs can trigger the slow mode also.
yes, QL78YC champion.
 

teampbc

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Re: evinrude 50HP keeps going into safe mode at full throttle

Originally posted by R.Johnson:<br /> Did you try testing the diode. The problem would show up more on the water, as the engine must hit 2500 RPM to go into SLOW.
I tested the diode and I got continuity in one direction but not in the other, so thats OK.
 
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