injector open alarm

Discussion in 'General Maintenance/Repair Questions' started by Ipasgas1, Jan 26, 2018.

  1. Ipasgas1

    Ipasgas1 New Member

    3
    Apr 29, 2017
    Estero, FL
    Searay 390 Aft Cabin
    8.1 Mercruisers
    I have an open injector alarm on my smart engine monitor (2005 Searay 390 MY with twin 8.1 Mercs). I had it checked 6 months ago and the mechanic found nothing wrong and alarm went away. Today, it is back. It does the 2 beeps/min unless I run up over 3000rpm then it seems to beep rapidly. One shop I spoke with says I will need all new injectors and it is a large, expensive job. Not what I prefer to hear. Any ideas? Could it just be sticking and I can kick it :O) Can it be a loose wire or is it always bad?
    Thanks,
    Dan
     
  2. Bt Doctur

    Bt Doctur Well-Known Member

    Aug 21, 2010
    New Jersey
    Ex SRV 240 Weekender twin
    in between
    the injectors are standard GM items and can be sent out for service. Depending on the application you loosen and remove the top rails ,disconnect the injector plugs and pull the injectors out.
     
  3. Bt Doctur

    Bt Doctur Well-Known Member

    Aug 21, 2010
    New Jersey
    Ex SRV 240 Weekender twin
    in between
    [​IMG]
     
  4. Ipasgas1

    Ipasgas1 New Member

    3
    Apr 29, 2017
    Estero, FL
    Searay 390 Aft Cabin
    8.1 Mercruisers
    Okay, now I can only rev both engines to 3600 rpm while in neutral before I get a solid tone alarm but the injector alarm is gone???
     
  5. Lazy Daze

    Lazy Daze Well-Known Member TECHNICAL Contributor GOLD Sponsor

    Apr 21, 2009
    PA
    Various
    Various
    Check the specs or a service manual for your engine - you may very well have an overspeed in neutral safety feature.
     
  6. paulswagelock

    paulswagelock Active Member

    Oct 25, 2010
    pa
    2018 SDX 270 OB on order
    Sold 2008 270 SLX 496 mag bravo 3
    Verado 300 pro
    Former 8.1 496 / bravo III
    Do not run the engine that high in neutral.
    If you are handy you can change all 8 injectors for $400 total yourself by buying the delco injector directly, not from Merc. The exact set of 8 from Merc is $2400.
     
  7. scoflaw

    scoflaw Active Member SILVER Sponsor

    Aug 10, 2011
    cape cod mass
    1999 Powerquest legend 260 sx
    502 mpi Bravo 1
    You're probably a victim of the CF3 paint issue. Don't do your injectors until you have scoped out the entire fuel system or you may have to do them twice.
     
  8. Ipasgas1

    Ipasgas1 New Member

    3
    Apr 29, 2017
    Estero, FL
    Searay 390 Aft Cabin
    8.1 Mercruisers
    I did wonder if there was a neutral overspeed...now I know. I was getting an alarm while cruising at 3200 so was trying to replicate but did not think it would be a different cause. This afternoon, I discovered the port intake impeller was shot so perhaps that is the cause of my alarm at cruise???
     
  9. Lazy Daze

    Lazy Daze Well-Known Member TECHNICAL Contributor GOLD Sponsor

    Apr 21, 2009
    PA
    Various
    Various
    Could very well be. You should probably have the codes read, rather than guessing at things. Check the chart for Merc warning horns and compare to exact rate/repeat rate that you heard - but keep in mind that the same rate/repeat rate can be used for multiple things. BUT, if the impeller is shot, that needs to be addressed (check housing for wear) anyways. Might as well do the stbd while you're at it.
     

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