Intermittent cut-out on 1998 7.4L Mercruiser

eaglenook

Recruit
Joined
Mar 22, 2010
Messages
1
I have a problem with my 1998 7.4L Mercruiser cutting out occassionally (every 30 minutes to an hour). I'm cruising along fine and it cuts out completely as if the key was shut off. Once this happens I put it back into neutral and it starts immediately and will run again for at least 30 minutes and then the same thing happens. I've changed quite a few components including the coil. Now I'm thinking of trying a replacement ECM to see if mine has a glitch. I understand the shift cut-off ignition circuit may be controlled by some ECM units. I'm wondering if this may be the cause of my cut-out issue? It acts as if the key is turned off or the shift cut-out switch is stuck on. It stalls out completely, but restarts immediately every time.
 

Scott Danforth

Grumpy Vintage Moderator still playing with boats
Staff member
Joined
Jul 23, 2011
Messages
47,296
when the engine dies, are all your other gauges still functioning? does the motor abruptly die, or does it sputter to a death?
 
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