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  1. M

    2020 VolvoPenta Gen5 Fuel Trim Faults

    A full model number, spec number or preferably the engine serial number is needed. But if you have good fuel pressure at the time of the fault, you could swap the pre O2 sensors from side to side and see if the fault moves. Just be careful how much you run this, lean is bad if you have cats...
  2. M

    Volvo Penta V6-240 Fuel High Pressure Dropping to Zero

    I just brought up the DTC 0088 because it's the only place the fuel control solenoid is mentioned. I found it somewhat strange that it wasn't listed as a possibility for a low pressure DTC. Maybe Volvo feels it can't fail that way? The low pressure DTC only sets at a very low pressure. Each...
  3. M

    Volvo Penta V6-240 Fuel High Pressure Dropping to Zero

    It would have been nice if there was an issue with the fuel feed pump, it would fit so nice with the symptoms. But your testing rules that out. Might be better if you posted the .rec files. the two you just posted are just a snapshot of a moment in time. I can't see much in them. The first...
  4. M

    new fitting for drive oil res for older boats

    I don't know about other parts of the world. But here in MN, especially this time of year when the Muskrats teeth are growing and hurting them. Suggest that you wrap this hose with a S.S. spring or use the S.S. braided trim lines. Adding a gear lube bottle is a good idea.
  5. M

    Volvo Penta V6-240 Fuel High Pressure Dropping to Zero

    Happy to help when I can. Please post the resolution when you find it.
  6. M

    Volvo Penta V6-240 Fuel High Pressure Dropping to Zero

    I'm pretty sure the HPFP is PWM with a fuel pump solenoid valve. The wires for it are in the harness and the diagram shows a HS and LS at the ECM. This thread has been a learning experience for me. Had no idea there was a pressure relief in the high pressure side, but it makes sense because this...
  7. M

    Volvo Penta V6-240 Fuel High Pressure Dropping to Zero

    You maybe pulling back on the lever, but from these "snapshots" The ECM seems to be adding air and fuel. If you look at manifold pressure, it's going up in chart 2 and has reached WOT in charts 3+4. Guessing the ECM is trying to add more air by opening the butterfly in the throttle body. If you...
  8. M

    Volvo Penta V6-240 Fuel High Pressure Dropping to Zero

    The video says the relief pressure is set by the manufacturer. Have you been getting these pumps from Volvo? I would think they would be the same pump used by GM, but some weird stuff can get changed during marinization. Agree that the chances of having 2 high pressure pumps fail exactly the...
  9. M

    Volvo Penta V6-240 Fuel High Pressure Dropping to Zero

    Don't think your in "limp mode" Here is Volvo's description of what your calling limp mode? Derate 1 limits maximum throttle opening to between 40%-45%. This will result in the engine speed dropping to somewhere near 3500 rpm. This speed will vary with the size and weight of the boat. When a...
  10. M

    WOT RPM Low. MAG350 MPI B3

    First I would check that the fuel pressure gauge is accurate. Might be relevant why the heads and injectors were replaced. In‑Water Test done in gear under load. 1. With a vacuum gauge and a fuel pressure gauge in place, operate the boat throughout the RPM range and record the pressure and...
  11. M

    B3X upper gearset lash

    Merc quit stamping numbers in the upper awhile back. Hope O.P. isn't in #28, that manual was like 600 pages in it's last version. Should be in #39, it's 6 books with about 1200 pages. Got to give a weekend warrior kudos to attempt this job, MerCruiser has made working on the new Bravo's soo...
  12. M

    B3X upper gearset lash

    Assuming you have all the tools and are following the service manual. That you have the exact same out of spec backlash on both gears is a bit of a red flag, guessing that it’s because of new gears and not wear. But when something unusual like this happens I would double and triple check my...
  13. M

    Volvo Penta 270 5L V8 power steering issue

    I think boats use a different pressure relief rating?
  14. M

    SX-D U joints and drive shaft non-repairable?

    Your gonna need some pretty big sockets for this job. I've only done this once without the Volvo tools, won't make that mistake again.
  15. M

    SX-D U joints and drive shaft non-repairable?

    I have done this job too many times. I don't think shop labor rate is why Volvo decided to only sell the complete assembly. Based on what I learned at Volvo drive school and doing the job. Volvo is very proud of how quiet their drives are compared to MCM. What they said they were finding in the...
  16. M

    Hot water heater

    It's been over a decade since I winterized a water heater. But it looks like the check valve is screwed into the hot outlet, should be in the cold inlet. Take a close look below where those hoses go into the heater. Should be a C and H stamped below them. If someone got things mixed up you can...
  17. M

    destroyed 2 gimbal bearing tools trying to dislodge a seized bearing. still stuck

    Might want to use your gimbal bearing install tool and make sure the bearing is straight. I'm guessing you either cocked it when you first started pulling or the last install wasn't straight. I was a "lazy" tech. If the bearing didn't come out with a few slide hammer pulls, I would drive it back...
  18. M

    Crack on drive unit - how concerned should I be?

    If you look closely right below the crack, there is a little 1/4" slot in the drive. That slot is there to drain the water out of the area where the crack is. My guess is that the drive hasn't been off in awhile or the last time it was, the person doing the service didn't know to check that area...
  19. M

    Bizarre IAC reading

    Are you sure 40 KNOTS? That boat would have had a speedometer that reads in MPH. Recordings might show an issue.
  20. M

    Bizarre IAC reading

    Diacom recording. Here is my recommendation on how to do the recording. Start with a cold engine and the boat in the water. 1. Connect Diacom 2. Turn on batt switch, turn on key switch -- but don't start engine 3. Start Diacom recording -- let run for 30 seconds to one minute 4. Start...
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