MarineEngine.com - Your online store for all types of marine engines and boat parts.
PHONE ORDERS
Monday - Friday
9:00 AM - 5:00 PM EST
Click for TOLL-FREE Number
Online Checkout
Special $9.95 Flat Rate Shipping
(800) 209-9624 | Home | Contact | Shipping | Returns | Cart View your shopping cart.
Part Number Search
Shop by engine/drive part number.
Original & matching parts for sale.
Manuals & Accessories
Shop by description, item number
or manufacturer's model number.
Boat Repair Forum Boat Repair Forum   Boat Video Gallery Video Gallery
   
Results 1 to 15 of 15
  1. #1

    Default Mercruiser 5.0 mpi alarm

    Hi there.i have a mariah sx 21 2005 with a 5.0 mercruiser mpi with around 160 hours on the clock,
    Last week I noticed a alarm sounding when I give her full gas,it does not sound at three quater or low revs only full and is a constant loud beeping and only goes off when I put her in neutral,I have checked all the levels and everything seems fine
    Any help would be greatly appreciated
    Thanks sam

  2. #2
    Join Date
    Sep 2010
    Location
    Jersey Shore
    Posts
    3,197

    Default Re: Mercruiser 5.0 mpi alarm

    Is it running hot?
    Chris
    Dockside Marine Services
    Jersey Shore.
    Let the insanity begin.

  3. #3
    Join Date
    Jul 2010
    Location
    Canada
    Posts
    630

    Default Re: Mercruiser 5.0 mpi alarm

    Last time impeller/pump serviced?

  4. #4
    Join Date
    Sep 2006
    Location
    Coquitlam, British Columbia, Canada
    Posts
    193

    Default Re: Mercruiser 5.0 mpi alarm

    It`s probably telling you to stop going full throttle in neutral. Unless of course you are tired of the boat and trying to blow it up.

  5. #5

    Default Re: Mercruiser 5.0 mpi alarm

    with a constant alarm, is there any loss of power? sometimes its easier to have a boat mechanic read the code in the ecm with a computer or you can buy a scan tool.
    Rinda scan tool for a 555 ecm.

  6. #6

    Default Re: Mercruiser 5.0 mpi alarm

    Quote Originally Posted by despy View Post
    It`s probably telling you to stop going full throttle in neutral. Unless of course you are tired of the boat and trying to blow it up.
    Hi there
    If you read what I put I didn't say I give it full throttle in neutral

  7. #7

    Default Re: Mercruiser 5.0 mpi alarm

    Quote Originally Posted by Docksidemarineservices View Post
    Is it running hot?
    Hiya Chris
    Yes the last time I was out it did get to three quater temp But when I stopped for a few minutes it seemed ok again but will never go to full throttle without sounding the alarm
    Thanks sam

  8. #8

    Default Re: Mercruiser 5.0 mpi alarm

    Quote Originally Posted by WoodieMan View Post
    Last time impeller/pump serviced?
    Hi there
    I had her serviced last year but I don't no if the impeller or pump was touched
    Thanks sam

  9. #9
    Join Date
    Sep 2010
    Location
    Jersey Shore
    Posts
    3,197

    Default Re: Mercruiser 5.0 mpi alarm

    Sam,

    Sounds like it is time for a water pump. Make sure they use Mercruiser parts nothing else!
    Chris
    Dockside Marine Services
    Jersey Shore.
    Let the insanity begin.

  10. #10

    Default Re: Mercruiser 5.0 mpi alarm

    Thanks Chris will do
    Sam

  11. #11
    Join Date
    Sep 2006
    Location
    Coquitlam, British Columbia, Canada
    Posts
    193

    Default Re: Mercruiser 5.0 mpi alarm

    You stated it only goes off at full throttle and only in neutral. Your words, sir !

  12. #12
    Join Date
    Sep 2010
    Location
    Jersey Shore
    Posts
    3,197

    Default Re: Mercruiser 5.0 mpi alarm

    Quote Originally Posted by despy View Post
    You stated it only goes off at full throttle and only in neutral. Your words, sir !

    The alarm sounds at full throttle while under way and only "goes off"(is silenced) when he stops the boat and puts it in neutral. He did not say he is giving it full throttle in neutral.
    Chris
    Dockside Marine Services
    Jersey Shore.
    Let the insanity begin.

  13. #13
    Join Date
    Sep 2006
    Location
    Coquitlam, British Columbia, Canada
    Posts
    193

    Default Re: Mercruiser 5.0 mpi alarm

    You are sound asleep and your alarm goes off. Now you can see the confusion caused by unclear descriptions of what is transpiring. I would have said the alarm shuts off but I guess we are splitting hairs now.

  14. #14

    Default Re: Mercruiser 5.0 mpi alarm

    Quote Originally Posted by despy View Post
    You are sound asleep and your alarm goes off. Now you can see the confusion caused by unclear descriptions of what is transpiring. I would have said the alarm shuts off but I guess we are splitting hairs now.
    Despy,thanks again for all your help
    You have been no use whatsoever
    Sam

  15. #15
    Join Date
    Sep 2006
    Location
    Coquitlam, British Columbia, Canada
    Posts
    193

    Default Re: Mercruiser 5.0 mpi alarm

    That`s my specialty, being of no use whatsoever.

Similar Threads

  1. Alarm on 496 mag Mercruiser
    By hellydude in forum Mercruiser Sterndrive Archive
    Replies: 3
    Last Post: 08-25-2009, 03:56 PM
  2. Mercruiser Alarm
    By abeach in forum Mercruiser Sterndrive Archive
    Replies: 6
    Last Post: 07-06-2009, 12:36 PM
  3. Mercruiser 50 EFI Alarm
    By cliff_mygatt in forum Mercruiser Sterndrive Archive
    Replies: 2
    Last Post: 01-12-2009, 07:47 PM
  4. Mercruiser alarm
    By Ed Smith really in forum Mercruiser Sterndrive Archive
    Replies: 1
    Last Post: 10-16-2008, 12:13 PM
  5. Mercruiser Alarm
    By treeaxx in forum Mercruiser Sterndrive Archive
    Replies: 5
    Last Post: 06-04-2007, 08:43 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •