2008 Evinrude E-TEC 55MFE Technical Manual, Page 105Get this manual
SYSTEM ANALYSIS EXHAUST WATER VALVE
EXHAUST WATER VALVE
During rapid acceleration, the EMM opens valve that injects water into the exhaustThis water changes exhaust tuning, boosting midrange horsepower as the boat comes on planeIf the valve is plugged or not working, the operator may not notice problem during slow accelerationDuring rapid acceleration, the outboard will be low on power around 3200 rpm, depending on boat and loadIf the valve is stuck open, the outboard may be low on top speed power (above 4600 RPM)
Disconnect the water valve outlet hose
1Water valve outlet hose
004293m
Exhaust Water Valve Static Test
Use Evinrude Diagnostics software to test the water valve solenoid electrical circuitThe water valve is 55 volt coilThe static test, which operates on 12 VDC, will not activate the water valveMonitor the voltage at pin (bluered wire) of the the water valve connectorVoltage should drop while the static test is active