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  1. W

    Mercruiser 5.7mpi horizon single cylinder burning lean

    Ok still need to get a leak down tester but that motor is using a small amount of coolant. I think steam cleaning of the plug due to a head gasket or intake gasket leak might be the culperet. I will report back when I get some more testing done
  2. W

    Mercruiser 5.7mpi horizon single cylinder burning lean

    I did not blow air but the hole is plenty pig to visually inspect and it was all good
  3. W

    Mercruiser 5.7mpi horizon single cylinder burning lean

    I have changed that injector with new orings…. But those are individual to each cylinder so if it was leaking air then could be the cause. What’s the best way to test that…. Would be a new intake if that is the case I am assuming…
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    Mercruiser 5.7mpi horizon single cylinder burning lean

    Not showing any signs of coolant use with fresh water cooled engine…. Not saying this isn’t the case. Most definitely something going on here
  5. W

    Mercruiser 5.7mpi horizon single cylinder burning lean

    That is next on the list but have to get a leak down tester
  6. W

    Mercruiser 5.7mpi horizon single cylinder burning lean

    This is the plug after running a bunch of miles This is the photo of the injector port on that cylinder
  7. W

    Mercruiser 5.7mpi horizon single cylinder burning lean

    Finally found time to get down there and test. Bright light same on all cylinders tested. I am at a loss right now.
  8. W

    Mercruiser 5.7mpi horizon single cylinder burning lean

    You mean a spark tester light?
  9. W

    Mercruiser 5.7mpi horizon single cylinder burning lean

    Just put new cap and rotor on. Have not done wires in a few years.
  10. W

    Mercruiser 5.7mpi horizon single cylinder burning lean

    https://photos.app.goo.gl/SiL5D2yRtqdQU52JA On is cylinder 4 the other is a different plug basically the same on all
  11. W

    Mercruiser 5.7mpi horizon single cylinder burning lean

    Ok I am trying to get photos of the plug, but here is the update. Changed the injector wires and ran the boat for a mile at 3200 and idled another 10 minutes minimum and no change in plug at all. So to date I have done the following basically eliminating a fuel deliver issue as far as I can...
  12. W

    Mercruiser 5.7mpi horizon single cylinder burning lean

    Ok thanks!!! And I wondered if batch fired even mattered with testing since it is firing multiples together. I will check this this week hopefully
  13. W

    Mercruiser 5.7mpi horizon single cylinder burning lean

    The wiring diagram I found looks like 1,4,6,7 are wired together with dark green and others are dark blue. Just checking to make sure 2,4 are the two I need to swap. If not I don’t know that 6 has enough slack to get to 4 https://www.scribd.com/document/95804729/Mercruiser-Electric
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    Mercruiser 5.7mpi horizon single cylinder burning lean

    Serial is 0L304797…. Is it bad that I have the memorized😜
  15. W

    Mercruiser 5.7mpi horizon single cylinder burning lean

    Did you mean see if it moves to 2?
  16. W

    Mercruiser 5.7mpi horizon single cylinder burning lean

    Yes it is firing.
  17. W

    Mercruiser 5.7mpi horizon single cylinder burning lean

    I have got a 2000 5.7 horizon mpi. When i pulled the plugs on it cylinder 4 was white on the porcelain with some black on the metal. Definaly burning lean from the other 7. Immediately lead me to a possible bad injector so i changed it out. I was pretty positive that was the problem since...
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    Mercruiser 5.7 Horizon MPI running rich / hard starting

    I have a 2000 Mercruiser Horizon 5.7 MPI. Serial # 0L304797 When I start it up it is running very rich. The IAC valve is staying open much longer than the other side. It also seems to have a little less power than the other side. The rpms always climb up slower on that side. Sometimes in...
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    How to paint my drive

    Evinrude Boater How did you strip your outdrive down to bare metal? How hard was the transom plate, gimbal ring while still on the boat?
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    Primer bulb gas line seeping fuel

    I have a 75 hp 2003 merc 2 stroke. The gas line from the permanent fuel tank will very slowly and I mean very slowly leak out some fuel... just enough to leave an oily residue in the rear transom well to collect dirt and make one heck of a mess... I have replaced the fuel line with a brand new...
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