The last 4 months I have had the same problem with my motor. This has had me on the road for 30 hrs or roughly 1800 miles. I have taken my boat to the same repair shop since day one. They have installed a rebuilt computer, new computer, crank-shaft position sensor and lastly a injector. The injector was the idea of a Tech. that travels the country, who stopped in last week. However, I took it out this week-end and same ole story(won't run). I notified the repair shop first thing Monday morning and haven't heard back yet. I have been put on the back-burner several occasions during this period; Shouldn't I have priority? It has been a long and frustrating ordeal. What would some of you do in this situation? Any comments or advice would be appreciated.

what do you mean "wont run"? Wont start, idle, rough running? Please clarify-Thanks:laugh:

When I leave the repair shop, it is running and it may or may not run when I get it home. Two times it has ran for about a day. However, the next day when I put it on the ramp; it will not run. When it is running it may sputter or even kill, but usually starts again. This last time out after the injector was put on it ran for 1 day, not great but it ran. Then the next day I couldn't get it started. It acted like it wouldn't to run at higer RPM (2000). I knew this because I had the throttle advance forward. However, back to neutral and would die.

Have you changed the fuel filters? I know I say this all the time but run some seafoam through the gas. Alot of the time when merc technichians get an engine in that may have fuel system related issues they will run a dbl or triple serving of mercury quickleen (same as seafoam) through the engine...try the easy stuff first, especially since the dealer hasnt gotten you anywhere:boozer:

Yep, one of the first things I did along with the spark-plugs.

"They have installed a rebuilt computer, new computer, crank-shaft position sensor and lastly a injector"

rebuilt computer? without knowing more i'd have to start with a bad ground. also having a puter, they should be able to hook up a reader/scanner and see if the throttle postion sensor is correct, what the air metor is reading and then go from there. from what you have explained and not being there it does sound like a sensor/ground problem.

The motor has thrown several codes or the check engine light has come on. However, they say the codes are not showing up when plugged in to diagnostics. Are you talking about the ground for the crank-shaft position sensor?

This may really sound stupid but my brother was having issues with his motor this last summer, had it in the shop many times, it would run a little and than start missing and loose rpms. He noticed that his starting battery was taking a heavy charge when plugged in, found out it was not charging like it should. Had it repaired and runs like a top with out any issues. Just a thought.

It appears batteries are charging fine and my battery voltage is good to go. Thanks for the input though.

If it wasn't a computer controlled motor I would say it sounds like a intermittent coil pack problem. Had that befudle me for over a year and ruin several fishing trips with a old fashion (1987) 50 HP Merc.