sparkhill
New Member
- Jul 17, 2022
- 10
- Boat Info
- 2005 Sea Ray Sundancer 320
- Engines
- 6.2l Mercruiser MPI w/ Bravo III Drives
In need of some serious help!
My port engine (2021 repowered 6.2L Mercruiser MPI with ~75hrs):
-Starts fine when cold
-Maybe runs a little rough when in gear (not so much when running in neutral)
-Sputters to a stop once it reaches operating temp (160F-ish?) after running for 6-10min
-I can restart the engine but the time interval that it stays running gets shorter 2-3min
The engine has shut down on me at idle speeds, while up on plane, and in neutral while at the dock testing. One of these times the 50A breaker right behind the spark arrestor tripped but that's been the only "symptom" I've found so far.
So far I've: (1) replaced the starter slave solenoid (I was having intermittent starting issues for a long time prior to this issue), (2) checked all battery voltages - all good, (3) replaced the 50A breaker that tripped, (4) swapped the alternator from my other engine - made no difference.
I read of a somewhat similar situation on another forum and it turned out to be the ignition coil in that case. I may look there next.
Where else should I look?
I have a video of the engine sputtering to a stop that I will try to post a link to if I can figure out how to do that. The one thing I will say is notable is it continues to rotate and slowly soon down to a stop vs. the more abrupt stop you get when you turn the ignition switch off.
My port engine (2021 repowered 6.2L Mercruiser MPI with ~75hrs):
-Starts fine when cold
-Maybe runs a little rough when in gear (not so much when running in neutral)
-Sputters to a stop once it reaches operating temp (160F-ish?) after running for 6-10min
-I can restart the engine but the time interval that it stays running gets shorter 2-3min
The engine has shut down on me at idle speeds, while up on plane, and in neutral while at the dock testing. One of these times the 50A breaker right behind the spark arrestor tripped but that's been the only "symptom" I've found so far.
So far I've: (1) replaced the starter slave solenoid (I was having intermittent starting issues for a long time prior to this issue), (2) checked all battery voltages - all good, (3) replaced the 50A breaker that tripped, (4) swapped the alternator from my other engine - made no difference.
I read of a somewhat similar situation on another forum and it turned out to be the ignition coil in that case. I may look there next.
Where else should I look?
I have a video of the engine sputtering to a stop that I will try to post a link to if I can figure out how to do that. The one thing I will say is notable is it continues to rotate and slowly soon down to a stop vs. the more abrupt stop you get when you turn the ignition switch off.