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  1. #1
    Jim Kleban's Avatar
    Jim Kleban Guest

    Default "I have twin Mercruiser 454

    "I have twin Mercruiser 454's on a 40' Cruisers, Inc. My port engine recently stalled after running for about 30 minutes (the last 20 minutes at about 3,700 RPM. It began running very rough and wouldn't maintain RPM's, then stalled. It restarted, but idled rough and would not maintain any RPMs, then finally stalled again. Engine temp was normal (175), and no oil loss. About 2 hours later I was able to restart it and use it to pull into my slip. We tested the engine after it was restarted, and it was smooth at several different RPM's up to 3,000 (under no stress). The same thing happened the next time we took it out, after running for 30 minutes. I suspect it might be electronic, because I have digital tach's and when I tried to restart it the RPM's on the tach would jump around from 200 to 3,000 or so. It is a '94 with 1,200 hours, electronic ignition and 4 bbl Webber carb.

    Where should I start?"

  2. #2
    Not Me's Avatar
    Not Me Guest

    Default "Jim, The pick up coil in the

    The pick up coil in the distributor or a bad ground can do this. So can many other things. The grounds to the ignition are easy to check so I guess do that first. Look for loose or dirty connections. What kind of shape is the cap,rotor and plug wires in? Coil getting hot? Sounds like it is minor whatever it is."

  3. #3
    Join Date
    Sep 2003
    New Tripoli, PA, USA!

    Default Sounds like bad gas of a flood

    Sounds like bad gas of a flooding carb.


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