55chevytruck
New member
06 mercury 115 optimax been running poor for a while It’s on a pontoon boat It would run sluggish Then guardian mode would kick in Put it in neutral for about 5 seconds put it back in gear and it it might decide to run good but lately it’s gotten worse and last time I took it out it quit running Got home with it Checked spark Good Had a noid light for testing auto injectors Tried on the boat injectors Thought they were not working But the light was flashing very weak Also tried on air injectors They flashed bright This was as I cranked on motor The ecm runs the ground side of the injector So I checked all grounds and power to ecm