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  1. #1
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    96 merc 225 efi running rough when weather warms up

    1996 mercury 225 efi seems to run rough when the weather warms up.

    I had the same problem last year, it ran great in the fall and spring but throughout the summer in the 80 degree heat it would run rough intermittently at all speeds. I have had a hard time diagnosing this because it usually occurs after an hour or so of running so for small trips I dont usually notice it. Usually when it runs rough I hear continuous intermittent beeps (not the low oil sensor 4 beeps thing) from the warning horn. I'll have to give it additional throttle to stay at cruise, then all of a sudden it will be running like a raped ape. It almost feels like it is dropping a cyl or 2 or misfiring. At idle when it runs rough it will spit out a big cloud and get the misfire shakes.

    I always do my yearly maintenance, filters, plugs etc. I swapped an entire fuel injection system and vst off of another motor and still have the same problem.

    Any help would be appreciated.

  2. #2
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    I would like to add it is the stbd motor on a set of twins. The other motor runs fine, so fuel is not a problem.

  3. #3
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    Anyone?

  4. #4
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    I changed the main harness(had a spare) and the stator. Seems to have worked.

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