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  1. M

    5.0 MPI manifold t-drain failure

    This is exactly what happened to my 5.0 MPI. First start in spring water was shooting out. It was a blessing actually because it fixed my vapor lock problem whereby the malfunctioning valve was allowing hot engine water to back up into cool fuel module. After this I started leaving my single...
  2. M

    How to troubleshoot possible vapor lock issue.

    It doesn't. The valve stays broke. The vaporized gas cools on it's own then the boat restarts. The problem doesn't reoccur until you shut down again. Mine would only do it on the hottest of days. Come fall the problem went away. Once I figured out it was a vapor lock issue I would unscrew...
  3. M

    How to troubleshoot possible vapor lock issue.

    I had the same thing happen on my 5.0 MPI. I replaced the check valve assembly in back of the fuel pump. Problem went away. I think it stops hot engine water from backing up into the fuel pump.
  4. M

    MX 6.2 MPI idle issue?

    Replacing the IAC muffler is what solved the surging problems on my 2002 5.0 MPI.
  5. M

    Starboard side exhaust elbow running hot

    I once recorded my temps with an IR gun idling after engine (2002 5.0 MPI) was run on plane for several miles. Hottest spot on starboard elbow 154 degrees F, port 107 degrees F. I suppose it's been that way since new. Now has 1600 hours. Now I have heard that a shiny black surface can...
  6. M

    Driveshaft bellows inspection alpha 1 gen 2

    My exhaust bellows gave way two seasons ago. I removed it and installed the tube, easy job. Both driveshaft and exhaust bellows are/were now 18 years old. Stored indoors for most of it and always with drive lowered. With drive pulled I do not see any visible signs of cracks or anything that...
  7. M

    Driveshaft bellows inspection alpha 1 gen 2

    With drive trimmed up and looking from the bottom up and side to side, do they tend to break more on the ^ crease or the V crease? Where would be the telltale place to look?
  8. M

    Shift interrupt issue alpha gen 2

    Following along...would be interested to know how this turned out.
  9. M

    Mag 350 Spark plugs

    Typically when dealing with I/Os it is not uncommon to have to take the boat apart to gain access. Is it not possible to remove bulk heads/panels next to the engine to gain access?
  10. M

    Alpha Gen 2 Lube Oil in Exhaust Bellow

    Are you sure it wasn't the drive shaft bellows?
  11. M

    2005 - 350 MAG MPI HORIZON - Elbow gasket sealant or no?

    On my 2002 5.0 MPI raw water cooled I used Permatex High Tack to keep the metal gaskets steady, torqued them down, got the engine hot and retorqued them. 200 hours later no issues.
  12. M

    Power steering problem diagnosis

    New cable fixed my stiff and catchiness.
  13. M

    lower unit will not stay in gear when trying to reinstall

    I use a homemade outdrive cart, 2x4s on a furniture mover, so the uprights are not angled so the prop has to come off. I slide the spline washer onto the shaft and attach a plumber wrench (heavy) to hold the shaft CCW. Maybe Bondo's way is easier.
  14. M

    Mercruiser Shift Lever Identification and Loose Screw Fix

    I think that is a Quicksilver Commander 4000. Do a search and see if that helps. Saw a Youtube vid that may help.
  15. M

    Beeping

    Clean the lube monitor bottle out. Disconnect it, pour out contents and see how much gunk is in the bottom.
  16. M

    Beeping

    Is the beeping coming from the engine warning system or your stereo speakers? I have a boat from the same vintage and same engine and mine has a system whereby on engine shut down the stereo will beep two consecutive beeps back to back maybe 3 times to warn you that you have not ejected the...
  17. M

    Mercury 4.3 EFI won`t rev past 3000 rpm

    Not sure about yours but I know the MPIs have what's known as an "in gear" switch. My understanding is It's an electrical connection that tells the ECM that the motor is in forward gear meaning it has full RPM range at its availability. If not in gear, it tells the ECM to not rev past 3000 rpm...
  18. M

    Beeping

    Is this an MPI?
  19. M

    Mercruiser 5.0 MPI Half Power

    Thanks for posting the fix. Can you provide a bit more detail? Were the plugs the wrong ones? Were they just too old and worn?
  20. M

    Mercruiser 5.0 MPI Half Power

    The cap and rotor on these are known problem areas, at least in humid moist environments. I buy the NAPA Echlin equivalents. Many threads out there on this issue.
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