Search results

  1. M

    A question for Mercury outboard techs

    Fogging a newer 4 stroke EFI engine I've been retired from the boat business for awhile and never did a lot of outboards, but we always ran them on a storage mixture for layup. I was looking at a owners manual for a newer outboard and see Mercury doesn't recommend this on outboards. Here is...
  2. M

    How does guardian mode work?

    You didn't give a serial number so because this can be different for different models and years, I can just give this general advice from a owners manual. ENGINE GUARDIAN SYSTEM The Engine Guardian system monitors the critical sensors on the engine for any early indications of problems. Engine...
  3. M

    Fuel System Delivery Issue Mystery HELP

    The next steps are to determine if the engine not wanting to run above 1/2 throttle is due to engine guardian or fuel issues. First things to do are considered the "basics". 1. Visual inspection, looking for any fuel leaks, looking for loose fasteners - especially any electrical ground or power...
  4. M

    Fuel System Delivery Issue Mystery HELP

    The slow down and increase in engine speed could be fuel or it could be the ECM going into guardian mode. This is where the scan tool or warning horn would tell if the ECM is cutting back RPM until the problem goes away and then repeating the cycle. The ECM doesn't monitor the fuel pressure.
  5. M

    Fuel System Delivery Issue Mystery HELP

    I was typing during your reply. The single beep is important. Very. Please check. Pumping the bulb and having it help might mean that you could skip the scan tool and start with the 2 fuel gauges.
  6. M

    Fuel System Delivery Issue Mystery HELP

    When you replaced the low pressure fuel pump, was it because testing said it was bad or just guessing? Did you use a Mercury Marine pump from a authorized dealer or off of a place like amazon? Do you have a Mercury Marine authorized dealer near you? Preferably one on the water or close by...
  7. M

    Fuel System Delivery Issue Mystery HELP

    The status of the motor is that it now starts and runs fine up to 1/2 throttle, but starts to surge over 1/2 throttle? Pumping the bulb doesn't help? No warning horn when this happens? Do you still get the single beep when you turn the key on?
  8. M

    Volvo Penta Trim Cylinder issue

    I missed that you are already looking at the cost between the kit and complete pump. At $300 I would recommend the complete pump.
  9. M

    Volvo Penta Trim Cylinder issue

    The people trying to help are getting confused, You have a different system then they are familiar with. Your trim pump is outside the boat on the transom shield. Your pump only has up and down outlets. It doesn't care or even know about the port or starboard rams. Fluid comes from the same...
  10. M

    Continuing Problem with 2021 VP 250 hp 4.3 DI

    Your welcome, I enjoy helping when I can. Please keep us updated to the finial resolution. I would also recommend you do another set of recordings once everything is shipshape, they could come in very handy down the river. Plus I would sure like to see them. Be very interested what happens with...
  11. M

    Continuing Problem with 2021 VP 250 hp 4.3 DI

    Your boat, your money and time. You're there and I'm not, I'll try to help as much as I can. If replacing #2 plug got you back to WOT --- that's great! You were smart to stop with #4 and #6, one of the rules in troubleshooting is --- try not to add any new problems. You do need to change them...
  12. M

    Continuing Problem with 2021 VP 250 hp 4.3 DI

    Hi Dave, Files like these don't do much. There isn't a baseline files showing the transition from not running to running. The next files aren't consistent enough from file to file, some of the files don't even reach WOT, so don't really tell much. There is some information that is available...
  13. M

    Continuing Problem with 2021 VP 250 hp 4.3 DI

    couple of other thoughts for you I would call your dealer and ask about Vodia 5. It could be in your best interests to go to someone with Vodia 5, I have questions about the software in your ECM. The misfire counter reset issue, the lack of freeze frame data on active codes and some other stuff...
  14. M

    Finding out if 8.1 Engine is HO or Base?

    It was built 09/26/2003 By MerCruiser as a base engine and installed shortly later in a 1986/7 St.Tropez If I remember back then the cam and throttle body were bigger, and different software in the PCM,
  15. M

    Continuing Problem with 2021 VP 250 hp 4.3 DI

    Hi Dave, I started looking at the files. First thing I see is in the first file (07 07 2025 09 44 47) What I'm seeing is that during cranking the batt voltage drops to 8.75 and ign. switch volts drops to 7.14 There is a problem with the battery or wires/connections. Time for a new battery and...
  16. M

    Continuing Problem with 2021 VP 250 hp 4.3 DI

    I don't know why. You have what is basically a catalyst engine without the cats, maybe that has something to do with it? Did you try both KOEO and KOER? I'll try to look at the new files when I get time.
  17. M

    4.3GXI-E Excessive fuel consumption continued....

    And just because I'm curious. You bought a boat with twin 4.3s What boat? Why? Just curious, I try not judge. :)
  18. M

    4.3GXI-E Excessive fuel consumption continued....

    "could this be something besides a vacuum leak?" -- yes Agree with @alldodge but that's a big job. So --- First I would compare high AND low fuel pressures on both engine while doing four runs (in the lake) up to WOT and back to idle. Now compare what the needle did engine to engine and to the...
  19. M

    Continuing Problem with 2021 VP 250 hp 4.3 DI

    When you select the clear misfire data, you get a warning screen that basically says what I told you. just click OK that you read the warning and the next screen will let you choose --- counters-adaptation-both --- This screen gives a clue as to why a good dealer charges so darn much, and why...
  20. M

    Continuing Problem with 2021 VP 250 hp 4.3 DI

    The 4 year old battery is getting very near (or past) the normal life of a boat battery here in MN. Using a VOM is good, but the important reading is what the ECM thinks it sees during cranking (that's really all that matters). I have had batteries that tested good out of the boat, but would...
Top