Search results

  1. 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
  2. Z

    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.
  3. 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)...
  4. 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
  5. 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.
  6. 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...
  7. 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.
  8. Z

    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
  9. 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...
  10. 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...
  11. 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...
  12. 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...
  13. 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...
  14. Z

    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...
  15. Z

    Low fuel pressure, fuel filter half full while idling.

    I guess I need a lot of learning to do :-( I believe the idea is to stop the pressure getting distributed by blocking the fuel return line. Attached is the fuel regulator (I guess) and fuel filter pictures. Which hose do I need to remove? How will it stop the pressure leak by removing any of the...
  16. Z

    Low fuel pressure, fuel filter half full while idling.

    I recently got this boat. Mercruiser 5.0 MPI, Alpha1 Gen2. Had the engine checked at a mechanic running on muffs, and he showed me the fuel pump half full, and he said engine wasn't working at full efficiency. He said either air is coming into system, or fuel is leaking. Then I took it on the...
  17. Z

    MerCruiser 5.0 MPI diagnostic connector

    I had the engine checked at a mechanic, and he showed me the fuel pump half full, and he said engine wasn't working at full efficiency. He said either air is coming, or fuel is leaking. Then I took it on the water, and he was right, it stalled sometimes, especially when putting into gear. I had...
  18. Z

    MerCruiser 5.0 MPI diagnostic connector

    Thanks :-) I found the connector exactly at the same point. I was looking for one with 10 pins, this one has only four (just like a trailer connector). So in order to find the diagnostics codes, I guess I need to short two pins and the engine hopefully goes to service mode and starts blinking a...
  19. Z

    MerCruiser 5.0 MPI diagnostic connector

    Hello. Sorry but where is the diagnostics connector? I am posting a picture of my engine, can't locate the 10-pin connector :-( Pretty much looked all around it. Maybe there is none? Thanks
View older results
Top