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  1. Z

    Single point drain

    Attached are the serial numbers. I am worried that when I drain thru this plug, I might not be able to drain all the water in the engine. Is there any way to verify that?
  2. Z

    Single point drain

    Hi folks, Planning to winterize my engine the first time. Actually, I was going to give it to a marine shop (I'm in NH), but all the shops are fully booked until November and it will be freezing on next Sunday night, so I guess I have no option other than DIY. It is a MerCruiser 5.0 MPI. After...
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    Mercruiser 5.0 MPI idling problem

    This folk seemed to have a similar problem, but I didn't exactly understand how he solved the problem. Is there a usage method that I can avoid this happening? https://forums.iboats.com/threads/mercruiser-5-0-mpi-idle-issues-replaced-iac-bad-part-update-added-video.665184/
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    Mercruiser 5.0 MPI idling problem

    I replaced the distributor cap and rotor, it seems like it helped a bit. But still, after engines warm up, the idling problems show up more often. As I mentioned, the worst situation is when I am back at the dock, lots of traffic, the engine is warm, I need switch gears back and forth often and...
  5. Z

    Mercruiser 5.0 MPI idling problem

    I guess the switch is working. While the engine running in idle (it usually idles fine when engine is cold, right after start) I unplugged the switch connector, and the engine stopped.
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    5.0 Mercruiser MPI Broken distributor Screw hole

    I have the same problem. Did it fit? If so, where can I buy it? Thanks
  7. Z

    Mercruiser 5.0 MPI idling problem

    Attached is the sticker on the engine including the serial number.. https://drive.google.com/drive/folders/1y5yC2ZFtK4wsvNRwsXkCqjSyHxoOyU97?usp=sharing
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    Mercruiser 5.0 MPI idling problem

    It says there is no idle mixture screw on this engine, all is controlled by IAC, and replacing didn't help. About intake vacuum leak (checking vacuum hoses and connections for cracks, splits etc) I don't think I can handle this by myself. I am just an amateur hobby mechanic.
  9. Z

    Mercruiser 5.0 MPI idling problem

    I removed the switch, it seems to be working. I put the relevant pictures below. (Pictures taken engine not working, shut) https://drive.google.com/drive/folders/1C4441OqunqGX2PNX2MNgaz6m5E0ZwbeH?usp=sharing The only pins on the connector are 1 and 3 used. (2 is not connected anywhere)...
  10. Z

    Mercruiser 5.0 MPI idling problem

    I put the relevant pictures below.. The throttle and flame arrestors are clean. The idling stick and screws are shown. I plan to increase the speed if this group approves it. Thanks in advance... https://drive.google.com/drive/folders/1RwTvrV49JnI8JTjJONOhll_EymLjw5XR?usp=sharing
  11. Z

    Mercruiser 5.0 MPI idling problem

    It is Alpha Gen2, Sterndrive. When on gear and moving, engine is just fine and smooth. When I put into neutral, it idles roughly, but sometimes keeps on and continues. If it happens to be smooth idling, than gear mostly works. But rough idling, it is sure to stop when moved into gear.
  12. Z

    Mercruiser 5.0 MPI idling problem

    Popular idling problem. The flame arrestor is clean. Replaced the IAC valve but no change. Removed and put back the little sponge in the throttle, but no change other than the hissing noise that I don't care (The engine is loud enough). I measured the fuel pressure a while ago, no problem...
  13. Z

    Ethanol free gas for Mercruiser

    I believe a reputable gas station has less than %10. I am just worried even that amount maybe harmful my boat engine.
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    Ethanol free gas for Mercruiser

    What about the problem of Ethanol separation (they say, phase separation) where fuel separates from water and water going into engine can be harmful. Doesn't anybody have a problem with this, short term or long term? Thanks
  15. Z

    Ethanol free gas for Mercruiser

    Hi all. I used the live in South Carolina and recently moved to New Hampshire, Massachusetts area. I have a Stingray 2006 Mercruiser 5.0 Mpi inboard stern drive. In SC, there was no shortage of gas stations with no ethanol gas supply. But in new england area they are practically nonexistent...
  16. Z

    De-winterizing Mercruiser 5.0 mpi with heat exchange

    I dewinterized the engine coolant with (raw water I guess) by placing the muffs with hose water and running the engine a few minutes, I observed the red cooler became normal water coming out of the exhaust. I also emptied the red coolant in fresh water tank, by opening all faucets, then I filled...
  17. Z

    De-winterizing Mercruiser 5.0 mpi with heat exchange

    1) Ok I see. It is clearing up a bit. There is both engine water (antifreeze now) and raw water in the heat exchanger. Now I flushed (emptied) the raw water. So, how do I fill the raw water in the heat exchanger? 2) Macerator grinds and at the same time empties/flushes the waste water tank to...
  18. Z

    De-winterizing Mercruiser 5.0 mpi with heat exchange

    Hi Folks, I have a Stingray 2006 Mercruiser 5.0 Mpi inboard stern drive. I got it winterized last december, now it is time to de-winterize. During winterize, I gave it to a marine shop for engine anti-freeze fill up, and it was done. For the fresh water, I put the antifreeze into the fresh water...
  19. Z

    Low fuel pressure, fuel filter half full while idling.

    After removing the two batteries, I clearly located the cool fuel unit with naked eye, but there is no space to work in the circled area (port side). I can barely reach it, let alone to work on it, by leaning on the engine (with a blanket between my chest and the engine). How do you guys work on...
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    Low fuel pressure, fuel filter half full while idling.

    Sorry, I can't find anything that resembles the fuel pump, fuel cooler or fuel regulator. The Mercruiser service manual (#24) shows differents pictures that I see on the engine. Attached is the pictures taken from starboard side (snap 2,3,4) and front (snap 1), can you point out the above...
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