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Mercury 3L/4 Stroke/Verado Moderator
Would be much simpler to diagnose on the G3-2023 system. I didn't have much faith in the O2 sensor being the cause (it was probably reacting to something else).
Good idea to check the injector harnesses, wiggle-test the pigtails and connectors for each injector, and of course- using a KV meter check each cylinder to see if you have one that is jumping/changing abruptly.
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The harness is fine, clamp on my flush hose into block was loose. New clamp and a good rinse with salt away all good.
Checked my plugs they have about 30 hours on them now and they are too clean. White tip
I have noticed my fuel economy is great. Running 6.5 gal per hour now where it was 7.5 or higher at same rpm and load
New everything from engine forward, filters, hoses, no air leaks, triple checked
I tried bleeding fuel system of air thru valves on fuel rail but seem to get a shot of air every time I cycle the ignition key.
When I turn key on after the boat sits overnight I can hear a squeal from the fsm. Almost like it is pressure regulator.
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