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    Converting to carburetor from mpi 350 mag

    You follows are awesome I just can’t believe the wealth of info you all provided me with I already made a phone call and this follow was so helpful I still want to research ball this info and make a decision I would rather go with the mefi even if I have to program it to my engine if the price...
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    Converting to carburetor from mpi 350 mag

    Hello All, Ok short and sweet: I have a Larson Cabrio 330 year 2000 Engines are 350 mag mpi vortec serial number L365398 Struck by a lightening fried both ECMs Sent over to test them the tech said they’re fried you can’t refurbish them, he has a refurbished ones each for $2500 plus tax plus...
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    Stalled while idling now it cranks but no star or sparks

    Ok will do thank you… planing on spending Saturday there…I saw somewheres that they repair ECMs is there a kit to rebuild them or any knowledge on that if it came down to it? Thank you so much for your patience and sharing your knowledge. Nick
  4. I

    Stalled while idling now it cranks but no star or sparks

    Hmmm I agree I think it is something outside the engines that is not supplying power, I will test and see if there is power coming to the ECM this week… any suggestion how to zero in to see if it is a ECM or something external such as breaker or something. Thank you.
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    Stalled while idling now it cranks but no star or sparks

    I have an electrician saying without looking at it that it sounds like an ECM are gone could this be true since only one engine was running when the alternator spiked up and the engine sounded like under stress and it shut off, how could the ECM on the other engine get burned or ruined if it...
  6. I

    Stalled while idling now it cranks but no star or sparks

    Yes it cranks strong but no start no buzzer sounds no fuel pump sound
  7. I

    Stalled while idling now it cranks but no star or sparks

    Yes I have but nothing happened, I didn’t check to see if there is power at the 50 amp breaker though … these photos are of the buzzers behind the dashboard by the key not sure if they have anything to do
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    Stalled while idling now it cranks but no star or sparks

    What’s the worst case scenario I could have What’s the worst case scenario I can have do you think? ye sir the harness that is in the back of the engine the main harness, the 50 amp breaker is by the ecm this harness is on the other side of the distributor one of the poles ( the thicker one)...
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    Stalled while idling now it cranks but no star or sparks

    Just checked electricity at the coil with the key on but nothing there I also the the power to the fuel pump again nothing there.
  10. I

    Stalled while idling now it cranks but no star or sparks

    At the harness on the engine there is 2 poles that they barely have power very weak
  11. I

    Stalled while idling now it cranks but no star or sparks

    I searched no tipped circuit breaker did not find any fuse… power from key to the starter it cranks good and strong but no spark at the coil no fuel pump kicking no buzzer first you turn the key on the weird thing that the starboard engine was not running when this happened it was completely off...
  12. I

    Stalled while idling now it cranks but no star or sparks

    …and by the way the ALT did spiked very high
  13. I

    Stalled while idling now it cranks but no star or sparks

    I checked the fuses at the switch board and at the halm then at the fuse by the ecm all good both engines cranks but seems like no power at the distributor or at the fuel pump or even the buzzer when turn the ignition on. What is the MPR and where would it usually be, my boat is Larson 330 cabrio
  14. I

    Stalled while idling now it cranks but no star or sparks

    No sir I did not but I switched the dial around of the switch board
  15. I

    Stalled while idling now it cranks but no star or sparks

    Hello all, I have twin Mercruiser 350 mag mpi 2000 I had an issue with the (charging board or switch batteries board(?)) so I switched some cables around long story short, both engines idle nice and started with less than full crank now when I moved cables around in the switch board and turned...
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    No power under load

    Thank you Gents, I’m changing both have a fresh start.
  17. I

    No power under load

    Very important piece of information I will keep this one for future problems, thank you very much
  18. I

    No power under load

    Found it but tell me what you think, I got fuel tester and checked the gas pressure I turned the ignition on it went up with hesitation to barely 35 and dropped right back down to 25 and it held there for a 15 minutes or so started the engine it dropped even more to about 19 as I rubbed it up...
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    No power under load

    L365398 Thank you very much my apology getting back to you late.
  20. I

    No power under load

    Negative, only when it is under power trying to get on plane the speed doesn’t go over 10 knots.
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