700 ECU Help

[Fast Rider]

Long story short, the mounts holding my ECU cracked and in turn one of the ECU mount tabs cracked as well. Riding the sled, the motor had cut out and then I smelled something funny and popped the hood and sure enough there was some melted plastic coming from the broken area on the ECU.

I ordered up a new ECU (flashed for my yellow injectors) and mounted it up to some new mounts. Started the sled, let it idle for 10 min or so, then hopped on my trailer to raise the rpms a bit and the motor cut out. After a few minutes it started back up, ran for 20 sec or so then died again. I started it 1 more time and same result. I smelled the same thing as before coming from under the hood so I checked the ECU and it was hot to the touch on the side with the larger plug (the same side as the single mount tab). When the motor has been cutting out, the digital information screen (rpms, temp, etc) goes blank. Any ideas on what could be going on?

This is an 08 700 motor.

 

[Fast Rider]

Double post. Please delete.

 

[MORSNO]

I would think your voltage regulator is bad and putting your ECU into an over voltage condition causing it to overheat and burn out.

 

[Fast Rider]

After a bit of research on my end, mainly in a topic brought ttt on 'Protecting the ECU' I'm thinking the same thing. I was also thinking possibly a bad ground?

The bolts that mount the electronics plate to the clutch cover have a rubber section Between the bolt threads and the bolt head (not sure of the name of thenm, but it's not a solid bolt). This rubber broke on all of the mounts and caused my electronics plate to be free-floating if you will. I remounted this with solid thru bolts and placed a rubber grommet between the clutch cover and the electronics plate, thinking the initial rubber was used solely for vibration dampening. Is it possible the way I mounted this is what's causing my problem?

 

[outlaw700]

This sounds like the same problem I just fixed on my sled. Rebuilt the motor this past summer and broke one of those rubber mounts also. Figured they were for vibration also, ran bolt through with rubber washers in between the two plates. I found the electronics on the upper plate needs to be isolated from ground. Mine didn't seem to fry any electronics and runs great now.
Here is a link to a previous thread. http://www.snowestonline.com/forum/showthread.php?t=329405

 

[Fast Rider]

Will give this a go next before getting a voltage regulator! Thanks