1984 Merc 470 Wont stay running in the water

nalloco

Cadet
Joined
Jun 17, 2009
Messages
12
Ok guys, well about a month ago, i couldnt get the motor running, now it is running great with the ears on it, but i put it in the water over the weekend and it went down hill from there. When i first put it in the water, it idled perfectly, backed off the trailer, great, put it forward and out of the bay i went. i got out of the no wake zone and went to give it a little gas and it popped and that was it. i was able to start it back up and limp it back into the dock, but whenever i tried to give it any throttle in the water, it would go for a second and backfire and quit. Got it back home, put the ears on it, and sure enough, ran like a champ. Could their be some water or gunk build up in the gas tank causing it to not run well under load?
 

dara64

Cadet
Joined
Jun 16, 2009
Messages
16
Re: 1984 Merc 470 Wont stay running in the water

Wish I could tell you what is wrong,I'm sure someone here (hint hint) has got an idea!
 

searay3

Senior Chief Petty Officer
Joined
Apr 7, 2005
Messages
655
Re: 1984 Merc 470 Wont stay running in the water

Adults only sticky at the top of the forum, number 12. Before you can diagnose poor performance, all tune up and maintenance items have to be in order. Filters, plugs, cap, rotor, distributor advance,fuel quality, you get the picture. If all is in order, follow the list and you will find your problem..
 
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