1994 mercury 200 efi no power no rpm

desert fish

Recruit
Joined
May 13, 2017
Messages
1
94 merc 200 efi
​original problem was #6 hole was flooded with water I replaced every gasket from lower unit to the heads, ended up being exhaust manifold cover gasket blown out
​boat ran good for 10 minutes now it wont plane out and cant get past 4200 rpm in the water, on the ear muffs it sounds good
rebuilt entire fuel sytem, new high pressure pump, new regulator, test fired and clean injectors, same problem
​changed out switch box same problem
tested temp sensor,detonation sensor and module, all good
timing appears good
​tried multiple props no change
​any ideas this thing is getting hard to paddle around
 

jkillion

Cadet
Joined
May 28, 2015
Messages
14
Did you try running it with an external fuel tank? Mine was doing the same thing (although I didn't have all those problems you fixed) until I ran it on an external fuel tank. Drove myself nuts until I decided to fork out the 60 bucks for an external tank.
 
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