Evinrude E-NATION, for those dedicated to water, power, fishing and fun
Posts: 3
Registered: ‎05-15-2020

2007 etec 90hp power loss

Tried everything
Power loss at higher rpm
New pistons in this baby. Compression spot on
Cleaned vst. Was dirty. Small return filter as well. Not so dirty
New fuel lines due to deterioration
High pressure pump 30psi within spec. And cleaned its screen
Lift pump was clean
New plugs
New gas
Starts like a champ
Runs well except full throttle.
Purchased diagnostic tool so will do some live testing but no check engine. What to do.
Posts: 9,596
Registered: ‎07-14-2011

Re: 2007 etec 90hp power loss

[ Edited ]

When you said the fuel pressure was OK at 30 psi, was that tested at full throttle during the power loss?


You may want to order the factory service manual and follow the testing and troubleshooting procedures step by step in the proper order. That is how the trained and experienced technicians do it.






"There is never just one thing wrong with a boat";
                    -- Travis McGee, main character in a book series by John D. McDonald 



The factory recommends that a properly trained technician service your Johnson or Evinrude outboard motor. Should you elect to perform repairs yourself, use caution, common sense, and observe safety procedures in the vicinity of flammable liquids, around moving parts, near high-temperature components, and working with electrical or ignition systems.

The information offered here is only general in nature and should not be construed as complete factory approved procedures, techniques, or specifications. Always use the proper service manual for your motor, up-to-date service literature, the correct tools, and have an understanding of how to proceed with troubleshooting and repair methods. If you are unsure or uncomfortable with a procedure, a situation, or a technique, enlist the services of a factory trained technician.

Posts: 3
Registered: ‎05-15-2020

Re: 2007 etec 90hp power loss

I have the factory service manual. The instruction say to just start the outboard. No specified load or throttle. But I guess I could put a guage on.
Posts: 3
Registered: ‎05-15-2020

Re: 2007 etec 90hp power loss

So I never go beneath 28 pounds on my hi pressure pump. But I did get the motor running quite a bit better. The main things I did was calibrate the throttle position sensor. I guess it was way off from having the engine disassembled. So it didn't really know when the plates were starting to open affecting it all the way through to wot. But it still runs weird at wot now. It'll kick into full power and run smoothly for a couple seconds and then cut back again very abrubtly. And it'll keep doing that loosing about 3 to 400 rpm. But what's puzzling me is. When I disable one injector at wot and reinable it for about 3 seconds shell run like a top. It's almost like there's not enough fuel supply and its being allowed to build up while running on 2 injectors but as soon as the third one is enabled it'll maintain the fuel flow only for 3 to 4 seconds.
Posts: 951
Registered: ‎08-20-2017

Re: 2007 etec 90hp power loss

Check the connections on the big blue capacitor. They may be a bit loose and getting hot under load this reducing power to the injectors/coils.