Re: Engine shuts off.
My mercruiser 5.0 inboard just completely shuts off every once in a while. It does it no matter what RPM im running or speed. I replaced all the battery connectors and cleaned the ground to the engine from the battery. The only thing that I have noticed is that the Tach changes sometimes. Usually it reads around 3000 when Im running over 22 mph. If it reads off or starts changing a little, I can tap it with my finger and it go back straight. The temp reads around 170 on a regular basis. As far as I can see, nothing on the motor has anything unplugged or loose. Any suggestions.
I had a similar issue w/ a 4.3. I would be cruising along and out of the blue and the engine would die. The gages would die immediately, pointing me to an electrical issue. It would happen so quickly that I didn't have time to troubleshoot. It would start right back up. Really annoying, plus just asking for water ingestion when the motor dies at cruise speed.
One time I was able to catch a glimpse of my tach and it actually spun all the way around counter clockwise. I then paid a lot of attention to my tach and it would show intermittent RPM changes when the engine was obviously at constant RPM.
I first looked at the tach but it was OK.
I checked/inspected every bit of wiring I could get to. It wasn't until I cleaned and made sure that each connector was making good connection in the wiring harness disconnect that the problem went away. Hasn't happened in several years now.
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