Not planing and loses rpm

J

John Matura

Member
Jul 22, 2020
62
Boat Info
2006 sea ray 280 Sundancer
Engines
Twin 4.3l mpi mercruisers
Other day I was coming in and cruising 29 kt
About 3900 rpm then both engines drop to 3000 rpm and I couldn’t get back on plane
Changed fuel filters all other fluids seemed good then it happen again both check engine lit up on strbd gauge I slowed down and it went away any ideas??
 
Could be about 30 different things that could put that ecm into power reduction. You'll need a code reader to tell what happened.
 
Both engines at same time is what bothers me each has its own Ecm right?
 
So did you get the check engine display on both engines? If one got reduced from the ecm it was probably enough to drag the other one down.
 
Only check engine on one I also noticed that from about 5/8-wot there is no difference in sound or speed of engines
 
I have he coming sometime this week thanks for your input
 
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