Cutting out
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Cutting out

  1. #1
    AKA OhOneWS6 Last Mohican's Avatar
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    Default Cutting out

    Took the day cruiser out yesterday. I had enough confidence to launch on the other side of the lake from where I was going. It did great until about 10 minutes into the run then it started cutting out. It did the same thing on the return trip to the ramp. This was cruising at around 3K - 3.2K. Once it started cutting out I could drop below 3K and it ran fine.

    This is an Olds 455. The oil pressure never wavered. It has a 12 QT pan. Mallory marine Unilite dizzy, mechanical fuel pump, Quadrajet carb. My first though was a fuel issue but it seems odd that it was consistent about the time interval that it happens. The more I think about it I believe it may be a bad ballast resister that fails once it heats up.

    Any other suggestions?

    This is in my Ambassador project.
    http://www.performanceboats.com//showthread.php?t=70993

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    i would pull the distributer & replace it with a normal HEI & try it...see what happens ...if that solves the problem, then your good to go...if not, i would pull the carb & change it to a Holley or Edelbrock & see what happens!...isolating 1 thing at a time makes finding the problem much easier ...just MHO

    FastRat

  4. #3
    Senior Member harley222's Avatar
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    im having near the same issue, mine is the fuel filter and carb and im in the prosses of changing both....get a new fuel filter just incase and go threw ur carb..

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    Senior Member bc18's Avatar
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    Maybe there's something going on with your secondaries? What is your fuel pressure reading?

  7. #5
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    Default Fue line

    Quote Originally Posted by harley222 View Post
    im having near the same issue, mine is the fuel filter and carb and im in the prosses of changing both....get a new fuel filter just incase and go threw ur carb..
    It COULD be a cracked fuel line on the suction side. It won't leak, but it will suck air and starve the pump/carb..... If you don't have a fuel pressure gauge, get one. If you think it is the ballast resistor, jump around it just long enough to verify if the problem goes away.....If it doesn't, jump around the ignition switch, battery straight to ignition side of ballast...... How big is the carb? .......Ray
    LOUD BOATS SAVE LIVES

  8. #6
    Senior Member harley222's Avatar
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    oh its the glass fuel filter, the motor was sitting for a few years so the gaskets in the filter broke down and clogged the filter and the top one put that crap in the carb so now its all being replaced. oh the carb was an old carter AFB

  9. #7
    AKA OhOneWS6 Last Mohican's Avatar
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    Quote Originally Posted by Moneypit View Post
    It COULD be a cracked fuel line on the suction side. It won't leak, but it will suck air and starve the pump/carb..... If you don't have a fuel pressure gauge, get one. If you think it is the ballast resistor, jump around it just long enough to verify if the problem goes away.....If it doesn't, jump around the ignition switch, battery straight to ignition side of ballast...... How big is the carb? .......Ray
    All the fuel line is new. The issue only shows up after 10 minutes or more of running a constant RPM over 3K. I'd be scared of burning the unilite module out jumping the resister for that long. Would an air leak in the line take that long to show up?

    Quote Originally Posted by harley222 View Post
    im having near the same issue, mine is the fuel filter and carb and im in the prosses of changing both....get a new fuel filter just incase and go threw ur carb..
    Brand new fuel filter and all new lines. It's the canister type that looks like an oil filter. Carb is the original QJet. It probably needs to be rebuilt.

    Quote Originally Posted by bc18 View Post
    Maybe there's something going on with your secondaries? What is your fuel pressure reading?
    At that RPM it's not into the secondaries. Before it starts acting up I can get into the secondaries and it runs fine up to about 4.2K. That is as far as I have taken it so far. No fuel pressure gauge at the moment.

    Quote Originally Posted by FastRat View Post
    i would pull the distributer & replace it with a normal HEI & try it...see what happens ...if that solves the problem, then your good to go...if not, i would pull the carb & change it to a Holley or Edelbrock & see what happens!...isolating 1 thing at a time makes finding the problem much easier ...just MHO

    FastRat
    HEI is on the list. I'd like to isolate if it's a fuel or ignition issue first. Don't really want to spend money I don't have to on this one.

    Thanks guys. All great suggestions. I will pursue all of them. I am going to add a fuel pressure gauge and a light between the coil + and ground. If it is loosing power to the coil the light should go out. If the fuel pressure is dropping then I will at least have a direction to go.

  10. #8
    Senior Member bp298's Avatar
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    i'd guess it's in the ignition system. if you can cruise along at 3200 just fine for 10 minutes, and then it starts to act up, something is starting to break down as it heats up. had the same thing happen with an hei - boat would run fine for 10-15 minutes, then die. replaced the electronic ignition module, all fixed. after the guy at the napa store "tested" the module and said it was good - it wasn't.

  11. #9
    Member neverenuf's Avatar
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    How old is the coil? How about the ignition (key) switch on the dash?

  12. #10
    AKA OhOneWS6 Last Mohican's Avatar
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    Not sure on the age of the coil. It is an MSD Blaster 3 IIRC. I ordered a new ignition switch today. I'm sure the one in it is original to the boat. I have also had a problem with the start position of the key switch not working intermittently. I can cross the solonoid or hook up a bump switch and it will turn over and start no problem. There does not seem to be any correlation to the start position not working and the cutting out at RPM. The one common piece would be the ignition switch though.

  13. #11
    Member payondemand's Avatar
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    check coil mounting if it is loose it will lose ground

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