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  1. #1

    Default PCM 454 7.4L Stalling after gets warm and won't start back till cool

    I have a 1990 Supra Saltare with a 454 7.4L. When I run the boat either in the drive way or on the lake after about 20-30 mins it will just stall out like u turned the key, and will not start back until it has cooled of 20 mins or so. I have replaced alternator, rebuilt carb, ballast resistor, coil, and ruled out a fuel problem after that. I don't know I am stumped. Any ideas or help would be great!!

  2. #2

    Default Re: PCM 454 7.4L Stalling after gets warm and won't start back till cool

    Has spark even after shut down and plenty of fuel flow from carb. Is there some kind of sensor or something that could be bad and heat up to cause shutdown?

  3. #3
    Join Date
    Sep 2010
    Location
    Jersey Shore
    Posts
    4,635

    Default Re: PCM 454 7.4L Stalling after gets warm and won't start back till cool

    Why do you have a ballast?
    Chris
    Dockside Marine Services
    Jersey Shore.
    Mercruiser/Mercury Certified
    Let the insanity begin.

  4. #4

    Default Re: PCM 454 7.4L Stalling after gets warm and won't start back till cool

    One has been installed on the boat since I have had it, is it not needed?

  5. #5
    Join Date
    Sep 2010
    Location
    Jersey Shore
    Posts
    4,635

    Default Re: PCM 454 7.4L Stalling after gets warm and won't start back till cool

    Depends on what ignition system you have.
    Chris
    Dockside Marine Services
    Jersey Shore.
    Mercruiser/Mercury Certified
    Let the insanity begin.

  6. #6

    Default Re: PCM 454 7.4L Stalling after gets warm and won't start back till cool

    I know I have the flamethrower coil, as far as ignition I am not sure I will have to check. I think it may be a Mallory ??

  7. #7
    Join Date
    Sep 2008
    Location
    Maryland - USA
    Posts
    6,826

    Default Re: PCM 454 7.4L Stalling after gets warm and won't start back till cool

    Quote Originally Posted by Austinalaaa View Post
    I have a 1990 Supra Saltare with a 454 7.4L..... and ruled out a fuel problem.....
    Any ideas or help would be great!!
    how did you do that?

  8. #8

    Default Re: PCM 454 7.4L Stalling after gets warm and won't start back till cool

    It still has pressure at the pump and is getting good fuel Threw the carb after it stalls.

  9. #9

    Default Re: PCM 454 7.4L Stalling after gets warm and won't start back till cool

    And yes the ignition is a Mallory by the way.

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