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  1. #1

    Default 5.0 OMC cobra EFI hard to start after its been running

    I have a 1996 ChrisCraft 21' with a 5.0 OMC Cobra fuel injected engine with 350 hours. The engine starts right up when the engine is cold but after I run the boat for 30 minutes to a few hours ill dock it or beach it for a little while. When I go back to start it up after 10-60 minutes, I have to crank it for 10-15 seconds for it to start. Just wondering what this may be. Thank you in advance

  2. #2
    Join Date
    Mar 2009
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    Portland, Oregon,
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    Default Re: 5.0 OMC cobra EFI hard to start after its been running

    Quote Originally Posted by timmy8504 View Post
    I have a 1996 ChrisCraft 21' with a 5.0 OMC Cobra fuel injected engine with 350 hours.
    OMC was no longer a company in 1996.... and had not been since 1993.


    You have a Volvo Penta engine/drive.

    Find your engine model, and then go here.

    .
    Rick ... aka Ricardo..... AQ series Volvo Penta repair
    Portland, Oregon
    28' SDN F/B w/ twin Volvo Penta 5.7L DP drives

    "Intellectual growth should commence at birth and cease only at death." Albert Einstein

    Please... no PMs! Post your questions on the forum.

  3. #3
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    Mar 2009
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    Default Re: 5.0 OMC cobra EFI hard to start after its been running

    Quote Originally Posted by timmy8504 View Post
    ................. When I go back to start it up after 10-60 minutes, I have to crank it for 10-15 seconds for it to start. Just wondering what this may be.
    This will shorten your starter motor life and your cranking battery life.


    .
    Rick ... aka Ricardo..... AQ series Volvo Penta repair
    Portland, Oregon
    28' SDN F/B w/ twin Volvo Penta 5.7L DP drives

    "Intellectual growth should commence at birth and cease only at death." Albert Einstein

    Please... no PMs! Post your questions on the forum.

  4. #4

    Default Re: 5.0 OMC cobra EFI hard to start after its been running

    50faphue is the model. Serial t01282180

    Quote Originally Posted by RicardoMarine View Post
    OMC was no longer a company in 1996.... and had not been since 1993.


    You have a Volvo Penta engine/drive.

    Find your engine model, and then go here.

    .

  5. #5
    Join Date
    Mar 2009
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    11,996

    Default Re: 5.0 OMC cobra EFI hard to start after its been running

    Quote Originally Posted by timmy8504 View Post
    50faphue is the model. Serial t01282180
    Timmy, that is a 335 series 5.0L Ford engine according to the model.

    According to the model numbers shown on the Volvo Penta site......, this would be a 5.0FLPHUE.... ("L" in lieu of "A"), as I'm not seeing a 5.0FAPHUE.

    This is all Volvo Penta........... Not OMC.
    (OMC was dismantled by 1996 and was now Volvo Penta)

    Be that as it may....... you'll want to purchase a Volvo Penta OEM work shop manual for this model engine.

    NO Seloc manual.... and NO Clymers manual! Too many errors in those.


    ,
    Rick ... aka Ricardo..... AQ series Volvo Penta repair
    Portland, Oregon
    28' SDN F/B w/ twin Volvo Penta 5.7L DP drives

    "Intellectual growth should commence at birth and cease only at death." Albert Einstein

    Please... no PMs! Post your questions on the forum.

  6. #6

    Default Re: 5.0 OMC cobra EFI hard to start after its been running

    Ok thank you very much. I saw omc cobra on top of the engine and thought it was omc. Good to know what it is. Any idea what may be causing this issue?

    Quote Originally Posted by RicardoMarine View Post
    Timmy, that is a 335 series 5.0L Ford engine according to the model.

    According to the model numbers shown on the Volvo Penta site......, this would be a 5.0FLPHUE.... ("L" in lieu of "A"), as I'm not seeing a 5.0FAPHUE.

    This is all Volvo Penta........... Not OMC.
    (OMC was dismantled by 1996 and was now Volvo Penta)

    Be that as it may....... you'll want to purchase a Volvo Penta OEM work shop manual for this model engine.

    NO Seloc manual.... and NO Clymers manual! Too many errors in those.


    ,

  7. #7
    Join Date
    May 2014
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    MidTenn
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    5

    Default Re: 5.0 OMC cobra EFI hard to start after its been running

    I can't be sure, but if you are using gasoline with Ethanol, then this could be your problem. Had the same issue with my F150. Ethanol (MTBE) attracts moisture and just loves to stick to the valve seats in injectors. This can cause a hard starting situation - it did in my truck. I use some injector cleaners on occasion to clear up the problem, but the do make additives to counter the effects of MTBE.

    Here is a link to more information http://injectorrepair.com/ethanol-problem/

    Of course, if you are NOT using this stuff, then in the famous words of Rosanna Rosannadana, "Nevermind!"

  8. #8
    Join Date
    Mar 2009
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    Portland, Oregon,
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    Default Re: 5.0 OMC cobra EFI hard to start after its been running

    Quote Originally Posted by timmy8504 View Post
    Any idea what may be causing this issue?
    No.... not without seeing it for myself.

    you'll want to purchase a Volvo Penta OEM work shop manual for this model engine.
    There should be a trouble-shooting section that will hopefully help you.


    .
    Rick ... aka Ricardo..... AQ series Volvo Penta repair
    Portland, Oregon
    28' SDN F/B w/ twin Volvo Penta 5.7L DP drives

    "Intellectual growth should commence at birth and cease only at death." Albert Einstein

    Please... no PMs! Post your questions on the forum.

  9. #9

    Default Re: 5.0 OMC cobra EFI hard to start after its been running

    I had a similar issue with my boat. Ended up being the ecu. Try Gt40marine.com that’s where I got mine

  10. #10
    Join Date
    Mar 2009
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    Portland, Oregon,
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    Default Re: 5.0 OMC cobra EFI hard to start after its been running

    Quote Originally Posted by mike9812121298 View Post
    I had a similar issue with my boat. Ended up being the ecu. Try Gt40marine.com that’s where I got mine
    Mike, you have posted to a thread whereby the last activity was on 5-28-2014..... almost 6 years ago.



    .
    Last edited by RicardoMarine; 01-18-2020 at 07:39 AM.
    Rick ... aka Ricardo..... AQ series Volvo Penta repair
    Portland, Oregon
    28' SDN F/B w/ twin Volvo Penta 5.7L DP drives

    "Intellectual growth should commence at birth and cease only at death." Albert Einstein

    Please... no PMs! Post your questions on the forum.

  11. #11

    Default Re: 5.0 OMC cobra EFI hard to start after its been running

    It still could be useful to someone else.

  12. #12
    Join Date
    Sep 2010
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    Default Re: 5.0 OMC cobra EFI hard to start after its been running

    Quote Originally Posted by mike9812121298 View Post
    It still could be useful to someone else.
    Stop advertising.
    Chris
    Dockside Marine Services
    Jersey Shore.
    Mercruiser/Mercury Certified
    Let the insanity begin.

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