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  1. 10-21-2020, 05:36 AM #1
    Matty4920
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    Check engine alarm

    Mercury 150optimax DFI alarm sounds occasionally at low and idle speed.what should I look at to correct.
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  2. SilverFox579
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    #2 10-21-2020, 07:27 AM
    The next forum down covers your engine and please note engine serial numbers are required when posting.

    There are many things that can cause an alarm, is the alarm a continuous uninterrupted tone or a series of beeps? What is maintenance history? When was water pump last serviced and compressor strainer cleaned?

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  3. EuropeanAM
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    #3 10-21-2020, 12:04 PM
    Moving to the 2.5L Forum for you.

    Anytime you have cooling system problems, ALWAYS, ALWAYS start at the Source: The Water Pump.

    If you would, please take a moment to review the Announcements at the top of the Forum, and be sure to provide the Required Info (serial number) when posting. Thanks!


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  4. Matty4920
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    #4 10-21-2020, 09:09 PM
    I do not have serial number, and do not know how to find it as the decal on motor is unreadable.
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  5. SilverFox579
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    #5 10-22-2020, 07:15 AM
    Might check under cowl, there's a label on the starboard head containing serial number on my engine. Your may, or may not, have one. There's a picture showing this in this topic - How to find your serial number on your Mercury outboard
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