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    Volvo Penta AQ171 Bogs at Higher RPM

    Your right about dual carb, but I'm seeing a 4 cyl, scratch that, the 170 and 171 are 6 cyl So Boat89volvo is this a single engine boat or dual?
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    Volvo Penta AQ171 Bogs at Higher RPM

    If it's just one motor bogging than it's isolated, if both than have to look at the boat (electrical, fuel supply) instead of motor. Watch the Tach and see if both are effected the same
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    Volvo Penta AQ171 Bogs at Higher RPM

    Your said "both carb's" so this is twins and they both bog at same RPM?
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    What's this plug 1996 Volvo 5.0 FourWinns 200dlx?

    Don't do anything with it Many boat/motor manufactures build things that can be easily configured to be installed it multiple different Mod's. Your motor is not installed this way so just forget about it and go have some fun boating
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    What's this plug 1996 Volvo 5.0 FourWinns 200dlx?

    Tan is water Temp gauge, so guess it's for external gauge by motor if you want to install
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    5.7 gxi fuel pressure issues

    Pressure side, you need to know when the Reg opens
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    5.7 gxi fuel pressure issues

    Use a compressor and a air regulator valve. Adjust the air pressure to 45 or so psi. Connect the air to the Reg "some how" and slowly adjust the pressure until the Reg opens and note pressure https://www.volvopenta.com/shop/0/part-sections/54168056?hintPhrase=&hintType=None
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    5.7 gxi fuel pressure issues

    Being a 2002 I'll assume your GXi is above the B series, so at least C to G, serial number will verify If correct your fuel pressure should read, Low side 8 +/- 4 psi, High 50-60 psi from idle to WOT Seeing your at 85-90 psi, your Fuel pressure Regulator took a dump, or the return line back to...
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    What's this plug 1996 Volvo 5.0 FourWinns 200dlx?

    Might be for an Aux Tach connection. Look under the take and verify the color of the wire is Tan or maybe Gray
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    Electrical/Starting Problem with MCM 200 / 5.0L V8 Alpha One

    Using a voltmeter trace the circuits Check for 12V on both sides of the breaker It might be the key switch or fuse behind the helm. See that there is 12V on Red/Pur on key switch. Turn key to run and verify 12V on purple wire Turn key to start and verify 12V on Ye//Red With key in run verify...
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    Volvo Penta KAD32P (2005) – Need Help Identifying Tachometer and Wiring Connections

    The gauge model is VDO https://vdo-instruments.com/product/discontinued-limited-availability-29/
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    No Spark 1999 Johnson 150

    This should help
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    “Hot soked” 8.2 (2024 w/7 hours) engin

    Don't think heat soak Check fuel supply
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    2003 MPI 5.0 oil pressure sender

    Should but I've not done that, probably see something like 0V to 0.5V. I have watched the voltage change from key ON to Run
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    2003 MPI 5.0 oil pressure sender

    It "should" set a code which will show up on a scanner. The sensors go from low to high and a disconnected sensor the voltage will lets say float. The 3 wires on the sensor are Gray 5V, Blue/Black Sense, Black/Pink Ground. So low pressure will be around 0.8V or so, and a float voltage would be...
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    2003 MPI 5.0 oil pressure sender

    Yes, the 3 wire sender should be a code with it disconnected, but it doesn't go to the gauge it goes to the ECM. The gauge sender has a single Dark Blue wire on it
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    2003 MPI 5.0 oil pressure sender

    No, there is a crystal inside that generates a specific frequency with engine running. If frequency changes due to a knock the signal is received by the ECM which changes timing to eliminate knock The connector is removed by squeezing the top together on it self and pulled off
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    2003 MPI 5.0 oil pressure sender

    Does it resemble https://www.summitracing.com/parts/ado-213-96
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    Inverted fuel pump question

    Merc replacement parts are guaranteed to fit and work, just get the new design
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    2003 MPI 5.0 oil pressure sender

    Sounds like a knock sensor
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