I have a 2007 etec 175 and last season after say 5 minutes of idling or slow speed I would get the check engine light on the tacho and reduced power. Knock it off and back on then a blast at higher revs and all was fine. I changed the impellor as I thought this could be the cause as it was over heating and the last run of the season all was fine - but I didn't do much slow speed work.
Over winter I have removed the old tacho and installed a N2k network and now have the information on my HDS units.
At the weekend I got her back out of storage and ran her up in a tank - after 5 minutes of idle I got alarms - Low Voltage, Reduced Power, Check Engine.
The voltage on the HDS shows 12V when ticking over, and goes up to 14 when revving.
Any idea's - I am thinking battery's as they are an unknown age - 2007 perhaps if not older? I hope its not the EMM....
I had the stereo on all weekend while working and I didn't see a drop in voltage - but perhaps the battery's don't have the grunt any more?
I also had an issue with the trim on my last trip could this be linked as well- Evinrude e-tec issues...