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  1. #1

    Default 04 mercruiser 5.0 starts then dies

    Bought the boat last year from someone who told me they didnít use it at all the previous year(turns out itís been 2 1/2 years since use) Took the boat out 5-6 everything seemed to running smoothly. Winterized it at a local dealer. They had to replace the fuse on the starter and did a full service. I get the boy back and it starts and runs for about 3 seconds and dies. If I manually advance the throttle I can get maybe 7 seconds. It has fresh gas and a new oil pressure switch (fuel pump switch) From everything Iíve read online that or those wires seem to be the common cause. Also tried smacking the carburetor thinking the float was stuck. Just looking for any other tips or things to check before I bite the bullet and take it to a repair shop to sit 3/4 weeks for an easy fix.

  2. #2
    Join Date
    Sep 2008
    Location
    Maryland - USA
    Posts
    7,782

    Default Re: 04 mercruiser 5.0 starts then dies

    I'd suggest you need to diagnose your problem ....

    Assuming the engine is in decent mechanical condition, you are either loosing spark or fuel. A clamp on timing light should tell you if spark is present....and you can put a DVM on the fuel pump to see if it is running during an engine cycle....

  3. #3
    Join Date
    May 2010
    Location
    DC Burbs/Maryland Eastern Shore
    Posts
    1,580

    Default Re: 04 mercruiser 5.0 starts then dies

    As with your chum in another post, you might want a new amplifier module in that dizzer.
    Practicing the ancient art of ren-ching

  4. #4
    Join Date
    Jun 2006
    Location
    Spotswood, NJ, USA
    Posts
    4,771

    Default Re: 04 mercruiser 5.0 starts then dies

    bypass the pressure switch to teat it, Then do yourself a favor and install the Standard PS 114 type

  5. #5

    Default Re: 04 mercruiser 5.0 starts then dies

    Quote Originally Posted by makomark View Post
    I'd suggest you need to diagnose your problem ....

    Assuming the engine is in decent mechanical condition, you are either loosing spark or fuel. A clamp on timing light should tell you if spark is present....and you can put a DVM on the fuel pump to see if it is running during an engine cycle....
    wouldn't the boat not start at all if there was no spark?

  6. #6
    Join Date
    Sep 2003
    Location
    New Tripoli, PA, USA!
    Posts
    16,101

    Default Re: 04 mercruiser 5.0 starts then dies

    Is the choke closing?

    Jeff

  7. #7
    Join Date
    Sep 2010
    Location
    Jersey Shore
    Posts
    5,497

    Default Re: 04 mercruiser 5.0 starts then dies

    Is the lanyard switch in the off position?
    Chris
    Dockside Marine Services
    Jersey Shore.
    Mercruiser/Mercury Certified
    Let the insanity begin.

  8. #8

    Default Re: 04 mercruiser 5.0 starts then dies

    Quote Originally Posted by Docksidemarineservices View Post
    Is the lanyard switch in the off position?
    nope. Checked it and rechecked it

  9. #9

    Default Re: 04 mercruiser 5.0 starts then dies

    Quote Originally Posted by Mc00 View Post
    wouldn't the boat not start at all if there was no spark?
    Popped the air filter off and it was stuck open. Going to pull it back out of the garage and see.

  10. #10

    Default Re: 04 mercruiser 5.0 starts then dies

    Quote Originally Posted by Mc00 View Post
    Popped the air filter off and it was stuck open. Going to pull it back out of the garage and see.
    manually closed it. Boat fired up and ran 30 seconds and died. Wouldnít restart unless I pumped the throttle 5-10 times.

    Just going to call around to shops tomorrow. Thanks for the tips guys.

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