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  1. nola mike

    1993 4.3 engine oil type

    Interesting that synthetics are specifically not recommended. Wonder why? IIRC the old merc oils were synthetic instead of the current blend
  2. nola mike

    Started, died and wont restart

    And you run the risk of frying your PCM if that spark doesn't jump...
  3. nola mike

    Unknown Short Circuit

    If the diode is shorted closed, current flows backward through the op switch into the ignition (purple wire), so engine won't turn off when the ignition switch is turned off. Starter is engaged through the yellow/red wire, not anything on this circuit. If shorted open no current flows to the tks...
  4. nola mike

    Unknown Short Circuit

    This is not the OPs problem.
  5. nola mike

    Fuel capacity

    Plenty on the site about that if you search for it. If I could get it for the same price as a 3.0L I would, and would have to get a $1-2k discount over a similar 4.3. While the parts are harder to find and more expensive, you only need half as many as a vee engine. You for sure need to be...
  6. nola mike

    Belt Size or Part # for a 1985 Mercruiser 3.0 Alpha One Gen One

    As is the inline filter
  7. nola mike

    Need help with plugs selection

    I've been using these since my ngks rusted to crap after one season and one broke trying to remove. Any theoretical/magical performance gains offset by being able to remove the damn things.
  8. nola mike

    Unknown Short Circuit

    No it isn't. Again, disconnect temp switch. Test it directly. Hopefully you're making sure there's no power in the circuit you're testing for continuity. Incorrect. Alternator and coil have nothing to do with this circuit, as mentioned. Op switch doesn't work that way, it's a mechanical...
  9. nola mike

    Unknown Short Circuit

    @muc right, temp switch would need to be bad (closed when cold) for a short in p/y to blow that fuse.
  10. nola mike

    Unknown Short Circuit

    A diode failure shouldn't blow the fuse or prevent cold starting either way though, right? P/y doesn't become purple. It branches at the oil press switch. When you have oil pressure the purple feeds The p/y wire. I don't see how a short in the p/y would cause that fuse to blow unless the temp...
  11. nola mike

    Started, died and wont restart

    You might also be able to get to the tank through the vent line. looks like the starting system is separate from the PCM, so pulling the fuse to the PCM should disable the ignition and let you crank.
  12. nola mike

    Crusader 2004 Engine Ground Issue

    Wiggle test. Just like it sounds. See if you can grab the wires, wiggle them and see if you can get the engine to die
  13. nola mike

    1986 hydrasport

    What exactly is the question?
  14. nola mike

    Stalling and Starting problems

    Time to check the filter again
  15. nola mike

    Stalling and Starting problems

    Fuel issue until proven otherwise. Did you change/check the fuel filter?
  16. nola mike

    Lost gearage?

    I couldn't find your prop on the solas site, but odds are that's an 18p
  17. nola mike

    Unknown Short Circuit

    I don't think so, but depending on your fault you may not be powering your fuel pump. Default position of the tks module is enrichment... It provides less fuel over time when powered, like standard choke. That said, a lot more complexity for no real purpose.
  18. nola mike

    Unknown Short Circuit

    That looks like the tks fuse. Orange wire connects to the temp switch. A short in the wiring or switch will blow that immediately. Try disconnecting the temp switch.
  19. nola mike

    1970 181 to a 1978 181 different engine harness?

    It's literally a one minute job knocking it from the inside. You aren't touching anything but the old bearing. The alignment tool is a giant piece of steel, you won't hurt it. But feel free to use something else. Curious as to what exactly you're worried about?
  20. nola mike

    1970 181 to a 1978 181 different engine harness?

    Install doesn't really matter, although as others have said you'll need the engine in there to align it. However, to remove the old one, especially if it's rusted in place, it's much easier with the engine out of the boat. You can just use your alignment tool and a BFH to knock it out from the...
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