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OX66 issue. Help sincerely appreciated!

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  • OX66 issue. Help sincerely appreciated!

    Hello all
    So I am having a problem w my 2005 200hp OX66. I no longer can get above 4600 at WOT (used to be 5500) and my fuel consumption is even worse (now 17 gal/hr was 12 gal/hr).
    I suspected a stuck injector. So they were sent into Brucato FIS. he cleaned and recal to spec (they were ALL flooding).
    I also suspected O2 sensor, I removed and cleaned that. do this every spring anyway. The dog bone was caked with carbon, as usual, and there was wet oil in the tube.
    I also replaced spark plugs as all were wet and BLACK. especially the top 2.
    other maintenance/checks etc.
    -clean VST and filter
    -new thermostats
    -new LP pumps
    -new PCV valve

    After all this, I took for a rip yesterday. SAME symptoms. after only 20 min of running the plugs were black and kinda wetish looking. again, especially the top 2.

    I am really assuming my O2 sensor has failed. and needs to be replaced instead of cleaned.
    What do you guys think? Sound like a failed O2?
    BTW this outboard has never seen ethanol. ...not available in AK

    THANKS!!!!
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