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  1. G

    I have a 1999 Maxum 2300SC 5.7 Alpaha One with a bad ECU

    I watched a video by LST and found out that I can splice the yellow wire (water temp switch) to the Tan/Blue wire (Audio warning system wire) out of the old control module. So now I can fully remove the old ignition module. Do I need to still leave the Knock Control Module installed?
  2. G

    I have a 1999 Maxum 2300SC 5.7 Alpaha One with a bad ECU

    Also, at this point I still have the old Ignition Control module and Knock Control module connected to the engine harness. I left them connected because there wasn't anything in the Delco EST instructions about completely removing them. Also, there are some important items that are a part of...
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    I have a 1999 Maxum 2300SC 5.7 Alpaha One with a bad ECU

    on the crankshaft pully I have the 0* through 30* markings and an indicator arrow. At 700 rpm it is right on the 10* Before TDC. This is reading to the right of the 0* marking. Then when I throttle up to 2000 rpm it moves back to the left to 6* Before TDC. Then when I raise it to 3000 rpm it...
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    I have a 1999 Maxum 2300SC 5.7 Alpaha One with a bad ECU

    OK, Finaly got the guts to tear into this issue after disconnecting the knock sensor and still having the same issue. So, I removed the stock distributer and replaced it with the Delco EST Kit. I cut and spliced the wires indicated in the directions and hooked them up as directed. Before I...
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    I have a 1999 Maxum 2300SC 5.7 Alpaha One with a bad ECU

    This is all great information. I want to thank you all for your input. I will take the information you have given me and give it another try. I will be on vacation for the next week so when I get back, I will get right on it and send an update on what I find out. Thanks again, Guy0425
  6. G

    I have a 1999 Maxum 2300SC 5.7 Alpaha One with a bad ECU

    Ok, I reinstalled the timing module and the knock module, checked the timing at 750 rpm and found that it was at about 2* BTDC. I readjusted the timing to 8* BTDC @ 750 rpm. At 750 rpm it seems to bounce by 1* up and down. Then at 1000 rpms it drops to 2* BTDC and holds. At 2000 rpms it bumps up...
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    I have a 1999 Maxum 2300SC 5.7 Alpaha One with a bad ECU

    I will try checking the timing and let you know what I find out. Thank you!
  8. G

    I have a 1999 Maxum 2300SC 5.7 Alpaha One with a bad ECU

    Ok, first of all I want to thank you both for your input and the information you have provided. I purchased this boat brand new in 1999. Since then, I have kept it indoors and well maintained. I haven't had any issues with it until the last couple of years. The Boat is a Maxum 2300SC 5.7 350...
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    I have a 1999 Maxum 2300SC 5.7 Alpaha One with a bad ECU

    Is it a possibility that the anti knock module # BCTU 16184069 is the issue causing the 800 rpm surge?
  10. G

    I have a 1999 Maxum 2300SC 5.7 Alpaha One with a bad ECU

    Since its only an ignition module is there something else that I need to try or check before changing out the distributor?
  11. G

    I have a 1999 Maxum 2300SC 5.7 Alpaha One with a bad ECU

    “There’s are not the 5.7 alpha “
  12. G

    I have a 1999 Maxum 2300SC 5.7 Alpaha One with a bad ECU

    Mercruiser manual. I just want to make sure that I know what to do with all of the wires that plug into the module. I have watched multiple YouTube videos on how to do it but theirs the 5.7 alpha. One of the cables that came with the kit plugs into the right side of the coil. It has one gray...
  13. G

    I have a 1999 Maxum 2300SC 5.7 Alpaha One with a bad ECU

    There is no movement on the carburetor or the linkage
  14. G

    I have a 1999 Maxum 2300SC 5.7 Alpaha One with a bad ECU

    The reason why I am replacing the ECU: The problem I have been experiencing is when I throttle up from a stand still in the water and or on land, I get an 800 rpm increase 5 to 10 seconds after throttling up to any set rpm. I have replaced all the throttle linkage from the carburetor to the...
  15. G

    I have a 1999 Maxum 2300SC 5.7 Alpaha One with a bad ECU

    Are you able to leave it partially connected or is there a wiring solution?
  16. G

    I have a 1999 Maxum 2300SC 5.7 Alpaha One with a bad ECU

    The ECU is 861253-1 5.7 Alpha The wire numbers are from a wiring schematic From a manual I downloaded. As far as leaving it partially connected, that’s what I’m not sure about.
  17. G

    I have a 1999 Maxum 2300SC 5.7 Alpaha One with a bad ECU

    I have purchased a Delco EST distributer and coil kit to replace the ECU system. I am trying to figure out if i need to leave the ECU installed do to the #7 wire in the harness that runs the Shift system interrupt switch, the #6 wire for the audio warning system and the #8 wire for the water...
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