Mercruiser 4.3ltr. acts like key shut off

[pinkyd]

I have an '87 Mercruiser/4.3 that starts and runs well, but stops, displaying all guages in 'off' position (as if the key was turned off). Give it (don't have to touch anything) 5 or 10 seconds and the guages pop back up to normal, the engine will start (when the key is turned) up and seems happy! It seemed to be less likely to act up if we ran with the engine cover open to allow more airflow. Will problems with the (thunderbolt IV) ignition module cause this?

Thanks in advance for any suggestions

 

[glennrow]

Re: Mercruiser 4.3ltr. acts like key shut off

chances are you will be a much better response in one of the engine forums. best of luck.

 

[nirro]

Re: Mercruiser 4.3ltr. acts like key shut off

From one cadet to another. I don't know if you have solved this yet but it seems to me a possible electric problem. Some circuit breakers are thermally resettable. So if you have one of these somewhere and it gets overloaded it will open up and kill power downstream. Then in a few seconds it will cool off and reclose.

good luck.

 

[Haut Medoc]

Re: Mercruiser 4.3ltr. acts like key shut off

Welcome to iboats.....
You have an electrical problem.....
Get yourself a DVM & go through your system.....
You have a loose or corroded connection somewhere...
Start with cleaning your battery terminals & work outward.....​

 

[Don S]

Re: Mercruiser 4.3ltr. acts like key shut off

Old Post guys

Since the original poster only has 1 post, I doubt he ever looks at it anymore.