I have a 30 HP Evinrude Etec, Electric Start and Manual Start, Power Tilt/Trim, Tiller.
The EMM going through a reset is the first thing that comes to mind as the cause. If this occurs with the throttle open, it must be returned to idle state before higher speed operation may resume.
The reset condition can be verified through the use of EvDiag program. There is a parameter called power on time. If this resets to zero without the operator actually shutting down the engine, you can be sure it has reset.
As to why the EMM is resetting - it is most likely due to an RF source disturbing the EMM operation. A replacement EMM would likely result in the same condition. The source of the RF needs to be determined and the cause resolved. Likely candidates are spark plugs, high tension leads, or ignition coils.
Thanks very much. I have passed that along to the Service Manager. This Motor is a 2017 Model by the way.
They did a full Diagnostics on her, a few times, and never mentioned that parameter as being problematic. They are now telling me that the Motor is not big enough for the boat.....Sure, she is not that fast (23 MPH when alone) but that is fast enough for me, as the water is often too rough to use at full speed anyways, but even a 9.9HP would push the boat at its maximum for that size, without cutting out to Idle Speed.
I don't see what the Motor size in relation to Boat, has to do with this problem.
Then they mention the Shape of the boat stern....Seems to be grasping at straws now...
So do you suggest replacing Spark Plugs, WIres, Coils, etc., to try and solve the problem? Or is there a method that the Service Center can use to see RF Interference, like with an Oscilloscope or something?
Or maybe reroute Wires, or further insulate them?
What is the complete model number of your motor? The outboard industry no longer goes by year for engine identification, only model number.
"There is never just one thing wrong with a boat";
-- Travis McGee, main character in a book series by John D. McDonald
The factory recommends that a properly trained technician service your Johnson or Evinrude outboard motor. Should you elect to perform repairs yourself, use caution, common sense, and observe safety procedures in the vicinity of flammable liquids, around moving parts, near high-temperature components, and working with electrical or ignition systems.
The information offered here is only general in nature and should not be construed as complete factory approved procedures, techniques, or specifications. Always use the proper service manual for your motor, up-to-date service literature, the correct tools, and have an understanding of how to proceed with troubleshooting and repair methods. If you are unsure or uncomfortable with a procedure, a situation, or a technique, enlist the services of a factory trained technician.