1998 Johnson Evinrude "EC" 150, 175 FFI Service Manual, P/N 520211, Page 70Get this manual
IEngine SurgesRuns Rough SYSTEMCOMPONENT CAUSES ACTIONS
Repair or replace as necessary
Broken or Restricted Fuel Lines, Fittings, Filter Contaminated Fuel Damaged Fuel Pump(s)Low Pressure Pressure Regulator Stuck Open Low or Unsteady PressureUpper Cylinders may be Lean Fuel System Failed Injector(s)
Substitute known good fuel Perform Fuel System pressure test See Action StepsFuel System Fuel System Pressure Test See Action StepsFuel System
Perform cylinder drop test to isolate using OM:: Diagnostic Software and verify signal from ECU using timing light See Action StepsFuel System Leaking or stuck -look for fuel at PORT vapor hose fitting See Action StepsFuel System Monitor using timing light See Action StepsFuel System ECU affected by RFIverify corr.ect spark plugs and wires Replace with correct type See Sectioncan also set code 16 due to RFI Repair or replace as necessary Repair or replace as necessary