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  1. #1
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    150 Mercury XRI no power and hard start

    1994 0G061997 Mercury XRI 150 18ft Ranger 375V

    Boat sat for about 18 months, previously no issues in the 10 years of ownership

    Went to get it running and the battery was dead dead, just had been put in a few months before it sat.

    Got a new battery and for the first time ever the motor was having a hard time starting, finally got it to idle and headed to the water.

    Once in the water we idled the boat for a ways to let it warm up, went to get up on plane and it seems to lose all power almost to the point of dying.

    It idles fine all day and does well until trying to plane out.

    Things i have tried/replaced

    Compression 120-125 on all cylinders
    Spark to all cylinders
    Rebuilt pulse pump
    New primer bulb and lines
    Cleaned screen after electric pump, replaced screen before pump
    Verified fuel pressure both during idle and also while the boat was acting up and its 34-36 psi with a leakdown to about 30 psi after several minutes
    New water separator filter
    New spark plugs BUH8
    New trigger because the insulation was cracking at the coils
    Tried the cheap switch boxes from Amazon, these have since been removed
    Pulled injectors and checked the screens and verified pulse with a 9 volt
    New stator because the high side tested right at the low threshold on cranking reading with DVA

    I have not test drove the boat since the stator change but i will be here in a day or so but, im not really hopeful since the hard starting is still present

    Also tried a voltage test on the TPS, in nuetral im reading .25 but wide open im only getting 3.94 , im wondering how accurate my readings ar as i dont have the test harness
    I was using the small wire in the female pins on the plug( the temp sensor wire was disconnected)

    Im steadily running out of ideas(and budget)
    ANY ideas?

  2. #2
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    I would say ECU or injectors. You could have an injector or two clogged or stuck open and they would do just that. If they pulse it means nothing. Well, next to nothing. It tells you that the injector isn't dead, but it doesn't tell you if its functioning.
    I would send them out and have them tested: both the ecu and the injectors.

  3. #3
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    I have been wondering about the ECU
    Im off Monday so I’ll test the stator but I’m not holding out high hopes
    Also I’ll start calling around local to see if anyone has an ECU I can try local
    If not I’ll probably have to send it off

  4. #4
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    It’s worth every dime to have your injectors professionally cleaned and flowed. Especially with it sitting ten years. Welcome to scream and fly. Good luck!
    1990 Shadow bass boat w/ 2.4 200 Merc. Totally resto'd boat and love it!

  5. #5
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    Click image for larger version. 

Name:	20220604_215258.jpg 
Views:	41 
Size:	394.7 KB 
ID:	505623

  6. #6
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    you do want to use resistor plugs
    either BUZH8 or cheaper BR8HS10 with the ground electrode better resistance against fouling

  7. #7
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    Quote Originally Posted by OnPad View Post
    Click image for larger version. 

Name:	20220604_215258.jpg 
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    I was actually just about to ask about probing the injector leads coming from the ECU
    thanks for the picture!

  8. #8
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    Quote Originally Posted by PanRonnie View Post
    you do want to use resistor plugs
    either BUZH8 or cheaper BR8HS10 with the ground electrode better resistance against fouling
    Strange I just replaced what was in it
    I will definitely try this as well thanks!

  9. #9
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    So with the DVA as soon as I probe the wires my meter reads 11.3
    Upon cranking it goes from 11.3 to 35.6 … does this sound correct?
    I will add that I do not have that specific test harness either but I was able to slide my leads into the back of the rubber seal connector and contact the pins from behind.

  10. #10
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    Sounds about right.
    Have you put a timing light on it, after you replaced the trigger?
    You might also check the kill circuit on switch boxes for bleed thru voltage from a bad ignition switch. I'm not sure this would cause the problems your having, but you never know. I would rather troubleshoot, vs buy parts.
    Last edited by OnPad; 06-08-2022 at 11:14 AM.

  11. #11
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    I have not checked the timing
    could it go “out of time” just sitting?

  12. #12
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    No, but can when you replace a trigger.

  13. #13
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    Ahh gotcha makes sense
    ill have to get a light
    When I installed the trigger I counted the amount of turns the old one was threaded into the barrel that screws into the eyelet of the trigger, I did not adjust the length of the linkage front to back any at all, hopefully that makes sense … my typing is not the greatest

  14. #14
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    It sounds like you have done almost enough swapnostics to eliminate most problems. As long as the swapped parts were not defective? It's very possible your injectors are fouled from storage, as mentioned in above posts.
    There is also a test that could be done on your fuel pressure regulator to eliminate it as a problem.

    Not trying to be a dick. You could of saved yourself $$$ and headache, by getting a grasp on electrical system testing. Your farther ahead than most, with the purchase of a dva.
    I would recommend getting a service manual, if you don't have one, you can download one for a minimal fee, possibly free. Or purchase a paper copy from Ebay.

    Your typing skills are better than Dave S, after he's been drinking ethanol!!!

  15. #15
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    Haha yea I tried not to do the whole swapnostics thing
    But in my defense the trigger was checking good but was physically cracked on the outside
    The stator was checking at 26.4 cranking on the high side and the manual states 25-50 is acceptable range for cranking so I figured I’d try it

    In my opinion most of the other stuff I’ve done probably needed to be done anyway for preventative reasons so that’s how I justified those parts to myself lol

    Ill be heading to water sometime today to test after the stator replacement and

    I have read the fuel pressure both at idle and during attempted acceleration on the water and it holds at 34-36 psi

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