2007 Merc 115 4 Stroke EFI Limp Mode

RedTail8

Cadet
Joined
Sep 10, 2016
Messages
22
Hey guys, wondering if anyone might be able to point me in the right direction. I have the motor as stated in the subject line. As of late it's been going into limp mode after driving it for a little while. Thought it was an over heating issue at first because the alarm and limp mode would only happen after running it for a period of time. Like this morning, a buddy and I were driving across the lake, maybe a 10 minute trip, and the alarm came on and went in limp mode all the way back to the launch. It has been stuttering during acceleration. Not sure what was going on there.

After we ran it this morning checking out the motor putts with stuff, we put it back in the lake. Ran alright at higher speeds, but still stuttered during acceleration and while at 3500rpm would have a stutter occasionally too. Then after running it for a while it went back down to limp mode running pretty rough and only at slow speeds.
The impeller is streaming water just fine even at idle. The water coming out is only luke warm. The engine block even after running for a while is probably considered very warm to the touch but not hot. I can put my hand on it and leave it there. I have changed the thermostat as initially I thought it was an over heating issue.
I've just changed the spark plugs, flushed the injectors and tested the coils, and all them seem alright. Didn't notice anything alarming. Put the muffs on in the driveway and it wouldn't go above 2k rpm and ran pretty rough at rpms above idle. Idle seemed somewhat alright.
In the two seasons I've owned it I've winterized it with Marine Stabil, and have only used ethanol free/non oxygenated gas. The voltage also seems alright as when it's running the graph is showing it's producing 14.1 volts, or down to 13.9 depending how many accessories I have on.
I really would rather not take it in. I was quoted $115 for the first hour of diagnostics.
Anyone have any thoughts??

Serial# 1B423334
Thanks!
Marc
 
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