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  1. M

    ECM for 1999 Mercruiser MCM 5.0L EFI / 305 CID

    Mercury Marine EPC (electronic parts catalog) shows this engine to have MEFI3 but it could have been updated to MEFI4 because MEFI3 has been NLA (no longer available) for a long time, MEFI4 is also NLA for many years. Here is how you tell what you have. Here's a picture of the MEFI4 conversion...
  2. M

    Volvo Penta 5.7 no spark

    Good that the problem got sorted out! Thanks for the update. Now I recommend that you repair the wiring to the key switch, The screws that you used won't stay tight ---- the thread pitch is too wide ----- When those wires get loose you risk voltage drops and spikes. This is the main killer of...
  3. M

    Efi flooding

    Might be best to tell us what 8.2 you have. Serial number is best. The 8.2 could come with 2 different fuel systems depending on year. The VST or MOAS
  4. M

    Efi flooding

    Check the vent on the fuel pump assembly, might have a stuck float?
  5. M

    Procedure to drain and refill closed antifreeze on 5th gen Volvo Penta 4.3?

    go to https://www.volvopenta.com/en-us/service-and-support/your-engine/manuals-and-handbooks/ and download a free copy of the Service and Maintenance Manual The procedure is covered.
  6. M

    Volvo Penta 5.0 GXI-E Fault Code 41

    Hi David, It's best to start your own post. Tell us what engine you have (serial number is best) and what you have tested and what the engine is doing.
  7. M

    2008 8.1 Gil Fault Codes

    Those codes don't show up in the diagnostic manual. do you have a joystick on this boat?
  8. M

    Unknown Short Circuit

    NO……. This part of your post is completely false.
  9. M

    Unknown Short Circuit

    The blocking diode would also need to be shorted then yes.
  10. M

    Unknown Short Circuit

  11. M

    Unknown Short Circuit

    That's the blocking diode. If the diode is shorted internally, the engine will continue to run after the key is turned off. If this condition is found, removing the diode from its connector will shut the engine off. If the diode is open internally, the TKS module will not have positive current...
  12. M

    Volvo Penta 5.7 no spark

    Every Volvo dealer I've worked for has been willing to print a copy for someone who walks through our door. None of them would be willing to transmit it electronically. we sign an agreement to not do that. I'm guessing if you ordered the manuals from Volvo they would include a copy. Might want...
  13. M

    Volvo Penta 5.7 no spark

    28-1-6 Diagnostic steps for ignition coil Gas engines 3.0, Gas engines 4.3, Gas engines 5.0, Gas engines 5.7 Binder: Date: 05-2014 Page: 1(5) The following information applies to port fuel injected IAFM engines (2001 and up) that use a MEFI or EGC engine controller. The ignition coils on these...
  14. M

    Volvo Penta 5.7 no spark

    Volvo published a service bulletin covering troubleshooting this ignition system. That bulletin is S.B. 28-1-6 Most dealers will print you a copy if you ask them. I highly recommend you get a copy and follow it carefully before going further.
  15. M

    Volvo Penta 5.7 no spark

    Hi @mkor If you go to https://www.volvopenta.com/en-us/service-and-support/your-engine/manuals-and-handbooks/ and input your serial number the website will list the manuals that you should have to diagnosis and repair this engine. 47703486 wiring diagrams 7749393 EGC diagnostics and 7743614...
  16. M

    Magnum or No?

    Decals and ECMs are just a couple of examples of engine manufacturers setting higher prices for basically the same product, based only on how much that product sold for originally.
  17. M

    Magnum or No?

    Magnum was more of a marketing term and didn't really mean much depending on years.
  18. M

    TRS sterndrive maintenance

    TRS was a pretty robust drive but they could use one of two different transmissions (shifting is done inside the boat) borg warner or mercury marine. This is where problems might arise. Last I checked not much available for the merc trans. I worked on a lot of Scarab II's, they were my second...
  19. M

    Overheating under load

    Did you run a stiff wire through the bypass passage that is in the pic Lou C posted? That passage getting plugged is a common problem. Metal coat hanger works good.
  20. M

    Quicksilver transom assembly replacement

    TRN: 2A667781 61000004P MERCRUISER ALPHA TRANSOM Manufacture Date: 02/18/2021 Comments: QS ALPHA TRANSOM DIRECT SHIP ** NOT REGISTERED **
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