Sounds like Oil injection system to me. At idle speed, no alarm, but rev the engine up and the alarm goes off.
A friendly word of advice IF it is the oil injection system: It costs at least $600 or more to fix it. There's a plastic gear on the crank that is the cause of 99% of oil injection problems on Mercs. The part costs about $5, and the rest is labor in tearing the engine down to the crank.
The easy and cheap way is to start mixing oil in your gas. Simply disconnect the injection system, and mix it.
The injection system in Mercs is crap. I like the engines, but hate the injection system. I got a 200 EFI last year, and the first thing I did was take the injection system off of it. Mixing is idiot proof. If it's getting gas, it's getting oil.
If you want the name of a good mechanic that I HIGHLY recommend to check it out for you, let me know. He's in Charlestown, so he's not too far from you. I've used him a couple of times, and he's also worked on friends boats. Everyone has always been 100% satisfied with his work.



Reply With Quote