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tjm
Captain
Posts: 43
Registered: ‎02-26-2016

excessive knock code

Had the boat out yesterday running about 4000rpm when the alarm went off, engine slowed down and i got an excessive knock code on my 4.3 screen. I shutdown the engine so i could read the code details and was surprised that my 4.3 had no codes logged. Once I restarted the engine all ran good no returning code.

 

My dealer is not able to look at the engine untill the first week of july and is not willing to give me any insite into the problem until he looks at it.

 

The last firmware update performed on the engine was 5/18/17. not sure if this update had mapping change related to this problem.

 

any insite would be appreciated 

 

g2 250

M# E250XAG

S#  05488156

 

TJM

tjm
Captain
Posts: 43
Registered: ‎02-26-2016

Re: excessive knock code

Bill
Sure would appreciate your input

Tjm
Admiral
Posts: 8,391
Registered: ‎07-14-2011

Re: excessive knock code

There were software updates for certain engines to reduce the knock code. Your dealer can find out which software version you have and if updates are needed Of course if your motor is having the warning from a lean running cylinder, you want to get that looked at right away. If you are using old gasoline, perhaps adding premium to it to heip bring up the octane number may help.

 

Do not continue running the motor if the knock warning reoccurrs. Have your dealer check it out.

 

 

 


"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.


Captain
Posts: 139
Registered: ‎10-21-2015

Re: excessive knock code

As you do not provide the revision level of firmware currently in your EMM, it is difficult to provide an accurate answer.  There are EMM firmware updates, released after 5/18/17 which do address knock related issues.

 

All of the instruments capable of displaying BRP engine fault codes only display active faults.  When you shut down the engine, there were no active faults being broadcast.  That is why you had no fault information available.

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tjm
Captain
Posts: 43
Registered: ‎02-26-2016

Re: excessive knock code

Ok thanks for the info

Tjm