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    VP GXI 5.0 Running Bad, Plugs Fouled on Port Side Only

    Just to close out this thread, we put the boat back in the water and took a test ride. Started fine, idled fine and felt a little sluggish getting up on plane, but did get there. Ran hard for about 10 minutes and then we shut down the engine. We waited about 15 minutes and it started back up...
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    VP GXI 5.0 Running Bad, Plugs Fouled on Port Side Only

    We replaced the starboard riser gasket, torqued to proper specs. We then ran a water test with the hose, pressurizing both the exhaust cooling and engine coolant systems, all spark plugs removed and ran water for 5 minutes without cracking engine. No evidence of water from spark plug holes...
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    VP GXI 5.0 Running Bad, Plugs Fouled on Port Side Only

    My replies can often get very long to explain everything and may exceed the maximum size for a reply, so rather than try to put the reply into the thread, I just create a document file and attach it. Also, I sincerely hope its not my rings. You are probably right but that will be the kiss of...
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    VP GXI 5.0 Running Bad, Plugs Fouled on Port Side Only

    OK, did compression tests but discovered other issues which are probably involved. Plus, the tool we ordered for the compression test said it also did leak down, but when we started those tests, we realized that our tool only had one gauge and could not do proper leak down. Please see all the...
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    VP GXI 5.0 Running Bad, Plugs Fouled on Port Side Only

    Will do, ordered a leak down compression test kit and will report back the results. Thanks
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    VP GXI 5.0 Running Bad, Plugs Fouled on Port Side Only

    Sorry, GXI-J.
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    VP GXI 5.0 Running Bad, Plugs Fouled on Port Side Only

    Yes, replaced whole assembly. Yes, no O2 sensors.
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    VP GXI 5.0 Running Bad, Plugs Fouled on Port Side Only

    Thanks Todd. Don't know if you read my long BoatStory attached to the original post but we had put a brand new fuel pump in as part of trying to figure out this problem. So, I think our float is OK at this point.
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    VP GXI 5.0 Running Bad, Plugs Fouled on Port Side Only

    Serial number is 4202226846. We will check the compression and see if that reveals anything. Thanks.
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    VP GXI 5.0 Running Bad, Plugs Fouled on Port Side Only

    What could cause a fuel injected engine to hard start, idle rough, struggle to get up on plane? Mechanic said ECU showed temp sensor codes and replaced all 3 sensors. Same issue. Plugs showed all 4 port side plugs blackish and wet, all starboard plugs light brown and dry. Replaced all plugs...
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