Cummins Marine Diesel Repower Specialists › Forums › Cummins Marine Engines › QSB 5.9L running rough

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  • February 18, 2017 at 2:21 pm #15478

    David Hays
    Participant
    Vessel Name: Kinship
    Engines: Cummins QSB 5.9L-380
    Location: Pacific Northwest

    i started the engine today after a bit of time without running, a couple months.  In the meant time the only thing that has been done to the engine was adding a pan heater and changing the zincs.

    Today the engine started up fine but was running extremely rough. It gradually smoothed out but now occasionally it will sound like it again seems to be fine.

    I don’t know engines at all so am at a loss. I will say that the Smartcraft display is reading a fuel burn rate that is way too low. When installing the pan heater, I was working around the electrical connections on the port side of the engine. Is it possible that I disturbed one of those? If so, any suggestions on which to check out?

     

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  • February 20, 2017 at 5:16 pm #15563

    David Hays
    Participant
    Vessel Name: Kinship
    Engines: Cummins QSB 5.9L-380
    Location: Pacific Northwest

    Getting worse

    We are heading home and suddenly the engine started to run even worse, missing badly and the Smartcraft gave a very helpful message of “check engine”.

    Hope we make it home. ?

    February 20, 2017 at 3:29 pm #15558

    David Hays
    Participant
    Vessel Name: Kinship
    Engines: Cummins QSB 5.9L-380
    Location: Pacific Northwest

    Hi Tony,

    being out on the boat without my computer I was having a tough time attaching the photos here on the forum. I did email them to you and Rob however.

    Thanks again.

    February 18, 2017 at 7:45 pm #15489

    David Hays
    Participant
    Vessel Name: Kinship
    Engines: Cummins QSB 5.9L-380
    Location: Pacific Northwest

    Thanks Tony,

    I will try and get some photos tomorrow.  3-4 feet away would be in the middle of my fuel tank, but I will see what I can do.

    No codes at all.

    February 18, 2017 at 5:50 pm #15484

    Tony Athens
    Moderator
    Vessel Name: Local Banks
    Engines: QSB 6.7 550 HP
    Location: Oxnard, CA
    Country: USA

    I’d really like to see some very clear & in-focus pics of the entire  ECM side on the engine where “all the wires are”.. Not just close but from 3-4 ft away…

    Post here, but also send direct to me & “[email protected]”  in HIGH RES..Together,  are  the best “eyes” in the business bar none………..

    Any “Smart Crap” alarm codes? 

    Tony

     

     

     

    February 18, 2017 at 4:36 pm #15483

    David Hays
    Participant
    Vessel Name: Kinship
    Engines: Cummins QSB 5.9L-380
    Location: Pacific Northwest

    Thanks so much for the reply Rob. Sorry I wasn’t very clear.

    It was rough at the start but then smoothed out. However now it hiccups maybe on average about once everly 3-4 minutes minutes.

    Poor explaination I know.

    February 18, 2017 at 4:04 pm #15482

    Rob Schepis
    Forum Moderator
    Vessel Name: Tenacious
    Engines: 6BTA 5.9 330's - "Seaboard Style"
    Location: Long Island, NY
    Country: USA

    ” It gradually smoothed out but now occasionally it will sound like it again seems to be fine.”

    That above sentence is not clear?  So it still sounds rough occasionally or just on the one startup after layup?

     

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