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The Mariah Owners Club » Maintenance and Repairs » Mercury MerCruiser

problem with Mercruiser 5.0 MPI

Mercury MerCruiser

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Old 07-03-2012, 11:47 PM   #1

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Default problem with Mercruiser 5.0 MPI
On Saturday Mercruiser engine started to show non-standard behavior. I drove about 1 km, I knocked on the neutral, himself a dead engine. Again I started the engine was idling 400 rpm and irregular operation, alarm whistles. The temperature of the fine, fine lubrication, oil in bravo fine.
I found if I turn the key to the ON position the fuel pump runs all the time. (before the glitch pump shut off after 2 seconds after releasing ON).
Otherwise, the engine runs normally, full throttle in order.
Alarm beeps constantly.
Does anyone know what could it be?
Thank you. : (
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    • Old 07-04-2012, 01:02 AM   #2

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    Default Re: problem with Mercruiser 5.0 MPI
    Alarm issues are quite common Tomas. Have a look through this thread for answers.
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    Old 07-04-2012, 08:43 AM   #3

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    Default Re: problem with Mercruiser 5.0 MPI
    Yes I know that these issues are common. But I do not know why the fuel pump runs continuously (in the ON position), it is a safe mode?
    How do I reset the ECM unit 555 48 0708?
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    Old 07-04-2012, 12:56 PM   #4

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    Default Re: problem with Mercruiser 5.0 MPI
    Sigh.... i completely missed the fuel pump issue.

    Normally when the fuel pump is stuck on your fuel pump relay is stuck on, Try tapping/hitting on the relays a little to see if the pump will turn off with key on. You may need a new relay, The relays are on top of the engine.
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    Old 07-04-2012, 04:01 PM   #5

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    Default Re: problem with Mercruiser 5.0 MPI
    Yes there are 3 relays. I tried to measure, and they are fine, I also exchanged between relay. And still the same problem. It is a safe mode of ECM?
    Can I reset the ECM 555 0708 unit without a computer?
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    Old 07-04-2012, 06:33 PM   #6

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    Default Re: problem with Mercruiser 5.0 MPI
    You need a scan tool to read & reset the ECM.
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    Old 07-04-2012, 07:01 PM   #7

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    Default Re: problem with Mercruiser 5.0 MPI
    Can you please send me a web link where I buy scan tool and what model? Thank you,
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    Old 07-04-2012, 07:55 PM   #8

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    Default Re: problem with Mercruiser 5.0 MPI
    The Rinda tool is the only one i know of but i'm sure there are others. Here's a link but you might want to look around cuz its not cheap. You would probably be better off finding a local Marine mechanic & let him attach his scanner to your motor & diagnose the problem. If you decide to DIY you will likely also need a service manual for the 555 ECM.
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    Last edited by mikeyt; 07-04-2012 at 07:57 PM.
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    Old 07-10-2012, 08:48 PM   #9

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    Default Re: problem with Mercruiser 5.0 MPI
    I want to buy a Mercruiser Scan Tool product from the manufacturer Rinda technologies. I wrote an email ([email protected]), but I still do not have a response from the Rinda.
    Can you tell me where I can buy products Rinda?
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    Old 07-10-2012, 10:39 PM   #10

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    Default Re: problem with Mercruiser 5.0 MPI
    Quote:
    Originally Posted by TomasSE View Post
    I want to buy a Mercruiser Scan Tool product from the manufacturer Rinda technologies. I wrote an email ([email protected]), but I still do not have a response from the Rinda.
    Can you tell me where I can buy products Rinda?
    Sorry Tomas but buying direct from Rinda or finding one on eBay is the only source i know of.
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