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  1. Scott06

    Time to chuck the 470

    Here is a 4.3 install drawing https://samerwebapp01apncus01.azureedge.net/mmgw-env-b/filer_public/a6/0e/a60edabe-830a-4a0e-af7c-d296ce044500/43lhalphawithtwo-pieceexhaustmanifold_1996-2001.pdf Here is a 5.7 drawing...
  2. Scott06

    At wits end Runs great for 20miles then knocking then sputtering 3.0

    Is your choke opening. I had it where my choke would intermittently stick closed and foul the plugs like that
  3. Scott06

    HELP 2005 5.0 MPI OVER REV

    LFW... Loose F... Wire. In machines at work I have seen where we have to zip tie the cube relays into the socket.. Also could be a weak or corroded engine ground. I doubt you did anything to the ecu that would likely work or not. Intermittent is likely corrosion in wiring connections and...
  4. Scott06

    Stall during acceleration

    Just make sure it is opening fully. What carb kit did u use to rebuild it? You see a lot of issues with people using cheap kits. Would get a good kit from edlebrock or mikes carb parts. Everyone on here has had to redo carb rebuilds… hardest part is getting it clean… Id strip down and clean all...
  5. Scott06

    HELP 2005 5.0 MPI OVER REV

    There is nothing wrong with a properly done reflash. If it wasn‘t done right you need to go back to who you got it from, but from everything shown here it looks fine. if you have to tap a relay to get to to work replace it or clean the connections feeding power to it. Have you taken it out and...
  6. Scott06

    Mercruiser 3.0 to Mercruiser 4.3 swap

    no one is going to bother you if you go from a 135 hp 3.0 to a 175-220 hp 4.3. It wont be a race car... do the swap and enjoy it
  7. Scott06

    HELP 2005 5.0 MPI OVER REV

    Buy him some beer and he can walk you through it... while you drink 'his' beer... In the end as long as the tach is consistent - that any difference between dash tach and timing light tach is the same you can make it work. I think you will find that your 5800 rpm is like 4800 or so. But other...
  8. Scott06

    HELP 2005 5.0 MPI OVER REV

    So other than a likely inaccurate tach and a potential faulty fuel pump relay the boat performs well now correct?
  9. Scott06

    1978 evinrude 70hp model 70873 problem

    Over heating is influenced by- condition of water pump impeller Thermostat operating correctly clogged or corroded water passages that may impede flow if I recall correctly these motors have a telltale water port should have a strong stream of water coming out if week you are likely not...
  10. Scott06

    HELP 2005 5.0 MPI OVER REV

    not every timing light has a tach feature. If its a modern digital one like an Innova with a tach built in then yes, if its an old school one like mine then no. talk to your friend if he has a timing light and knows how to use it ( rare skill these days) likely one way or another he has a tach...
  11. Scott06

    1978 evinrude 70hp model 70873 problem

    Mark hub and prop with a sharpie, take it out and make the prop slip, see if hub to prop marks move. Possible the hub is bad from factory, also looks like it is nicked up, is blade bent damaged? also can you take a pic of cav plate but with a 4 ft straight edge coming off the hull ? Looks like...
  12. Scott06

    HELP 2005 5.0 MPI OVER REV

    Depends on which one you have Old school ones you connect to negative side of coil and a ground, i have a newer wireless one just hold near engine after setting cylinders and cylces…newer timing lights have a tach in them worth a couple buck invetsment. I still use my dads 60s vintage “All...
  13. Scott06

    HELP 2005 5.0 MPI OVER REV

    Exactly. You woukd know if you hit the rev limiter you would feel it miss.. try cycling the cylinder selector switch on back of tach and make sure its on 8 cylinder. verify with a shop tach. was this boat flooded or sunk?
  14. Scott06

    HELP 2005 5.0 MPI OVER REV

    Yes fuel pump relay sounds like it needs replacement. do you know the drive ratio on the alpha gen 2 ? I assume 1.62. i would verify your tach first likely it is off as 5100-5200 the rev limiter kicks in. do this before messing with props . I run a vensura , a nemisis would be a down grade in...
  15. Scott06

    Tips for removing intake manifold V6 4.3

    See posts 2&4 ...
  16. Scott06

    Stern Drive to Alpha One?

    Do you have a MC-1 (with lifting eye on top cap) or gen1 drive now? I assume you meant MC-1, not Alpha Gen 1 which is the same drive the guys are recommending you get to upgrade....
  17. Scott06

    First time winterizing my boat myself.

    You can be frugal (doing the work yourself) and still take good care of it. A lot of guys run conventional Rotella 15w30 which is about $15 a gal at walmart… been winterizing this was since I started helping my grandfather when i was 14, his boat, my parents boat, and now my boat have all...
  18. Scott06

    First time winterizing my boat myself.

    Not much of a savings skipping engine oil and gear lube savings … two of the easiest preventative maint items
  19. Scott06

    Tips for removing intake manifold V6 4.3

    To get to tdc on number one remove spark plugs you can turn by hand. Make sure it is on compression stroke not exhaust stroke , you can put your finger over plug hole will build pressure on compression stroke…also can remove valve cover and make sure both valves are closed… also can just mark...
  20. Scott06

    Picture of my prop - what’s going on here?

    Yes you need anew sleeve. It is mean to shear if you hit something...
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