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  1. Y

    Mercury 3.0 EST no spark

    Sanity check here, you're both talking about this wire? I believe when I checked voltage a while back at had 12v. So basically I'm just unhooking the shift interrupt and not "bypassing" it.
  2. Y

    Mercury 3.0 EST no spark

    I believe that's the wire next to the two white wires that you connect to go into base mode? If I remember correctly, I had 12v on that. Let me try that later and see. Thanks!
  3. Y

    Mercury 3.0 EST no spark

    I put in base mode per directions in service manual, which has you jumping the two wires on dist, and bypassing shift interrupt. I set to 1* BTDC. Once I take unhook wires on dist and put shift interrupt back it's still at 1* BTDC (should be 12* BTDC with advance at idle). When I rev it up, it...
  4. Y

    Mercury 3.0 EST no spark

    Took it out yesterday to see what it would do. No power, wouldn't rev past 2500 RPM's. Tried 2 modules and it was the same. Anything else I should be looking at?
  5. Y

    Mercury 3.0 EST no spark

    Hi everyone, Back at troubleshooting. Had my 1 year old in ICU and my 3 year old not much better. They are doing ok now!! Back to the boat. Fuel looks fine, no water. Smells fine. Decided to check timing advance. Nothing. It's 1BTDC before top dead center even while revving up. Followed the...
  6. Y

    Mercury 3.0 EST no spark

    Gas is definitely bad, especially since i just heard it was filled up back in early 2020 with ACN (worst in country). I knew carb was toast as well, so started to fiddle with that. Ended up about 1.5 turns out (forgot about fact gas is old), which actually runs pretty good and no dieseling as...
  7. Y

    Mercury 3.0 EST no spark

    Been out with Rona, so haven't had much chance to work on boat. Was thinking, how far out are the idle mixture screws adjusted on these? I know manual shows 1 1/8th, but I figure at sea level, old possibly watery gas I may need to go out much more to richen it up. Maybe this has something to do...
  8. Y

    Mercury 3.0 EST no spark

    Ok that's what I thought. I actually tried to get the T off, but was pretty solid in there so I just stopped. Figured it wasn't the issue anyways.
  9. Y

    Mercury 3.0 EST no spark

    Yeah, kind of just guessing at this point. Usually pretty good at figuring out this kind of stuff, just hard time with this one. Maybe it is just half tank bad gas. I did fill it up to full a week ago. I would drain it, but I have no where to put full tank of gas.
  10. Y

    Mercury 3.0 EST no spark

    I actually tried fattening the mixture, also thinking that this engine was designed for no ethanol and the fact that I'm at sea level, so would need a richer setting, but it didn't help at the time. It actually seemed to help slightly going leaner then 1 1/8th, but not much. I will try again...
  11. Y

    Mercury 3.0 EST no spark

    That is correct. I think compression was about 170 all 4, but very consistent. I did order another cheapy ignition module on ebay before I thought of running out to O'Reilly's and picking up a generic one. It just came in today, so I could throw that in and see. Be nice to have a known good OEM...
  12. Y

    Mercury 3.0 EST no spark

    All the plugs look good. Identical to this one. Going back to timing, this is the module I picked up just to see if it would run...
  13. Y

    Mercury 3.0 EST no spark

    It doesn't really die on it's own but I'm sure I could make it do that if I tried to bog it hard enough. It diesels when I shut off ignition. Base timing and firing order is correct, but it's moot since I'm shutting it off anyways, there is no more spark. Float level is dead on. I'll check the...
  14. Y

    Mercury 3.0 EST no spark

    Usually it will diesel for a bit when it's up to temp (170-180f). In video I posted, it wasn't fully warmed up so it only sputtered once.
  15. Y

    Mercury 3.0 EST no spark

    Idle
  16. Y

    Mercury 3.0 EST no spark

    I don't really see any mist, dry. Unless I open throttle, then I get accel pump. Looks dry on shutdown.
  17. Y

    Mercury 3.0 EST no spark

    Rebuilt the carb. Still stalling out and backfiring. Accel pump is working fine. I'll try to upload a video.
  18. Y

    Mercury 3.0 EST no spark

    Going to order this and try again. I only cleaned it before. I think someone changed main jets before since it had 165's
  19. Y

    Mercury 3.0 EST no spark

    I actually adjusted that. But I took it off as well using throttle by hand.
  20. Y

    Mercury 3.0 EST no spark

    Do you think it could be anti siphon? Looking at hooking external tank to see. Having a fun time trying to get rubber hose off tank. Doubt it's been off
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