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  1. #1

    Default 2010 Honda BF90D - Limp Mode Issues

    Bought a used 2010 17ft skiff with a 2010 Honda BF90D with less than 300 hours. Had a full service done on it immediately. No issues found by the shop. Everything seemed to be fine and it purred like a kitten. Took it out on a local lake and idled around quite a bit perfect. Then I opened her up and after about 15-20 minutes of running around 4-5k rpms it would lose power and go into limp mode. Turned it off and back on and everything was fine again for a few minutes and then do the same thing over and over again above 4k rpm. Took it back to the shop and they said it had no codes and everything ran fine - mechanic couldn’t find anything wrong. Took it out several more times after that and the same thing happens over and over again after running at cruising speed for 15-20 min above 4k rpm. Never a problem at idle/low wake speeds under 2k rpm - runs for hours. I suspected a fuel issue so I installed new water separator, fuel filter, fuel pump, hoses, clamps, bulb, connectors, running non-ethanol fuel, tank vents are open and clear, no line leaks, and bulb stays hard. Also doesn’t seem to overheat, water pump is new, strong cool pee stream. Oil level is good. When it goes into limp mode, it does not cause alarms, lights, or buzzer on console. So what am I missing - what else would cause a Honda 90 to go into limp mode after 15-20 min of running at cruising speed?

  2. #2
    Join Date
    Sep 2008
    Location
    Hague, Virginia, USA
    Posts
    4,925

    Default Re: 2010 Honda BF90D - Limp Mode Issues

    Don't know about the 90's. But on the 200/225's the only thing that will put it in limp mode is low oil pressure or overheat. If overheat, the engine will shut down in 20 seconds if overheat doesn't come down. If low oil pressure, then it will continue to run in limp mode.

    So your shop needs to check oil pressure under the same circumstance as when it goes into limp mode, or change out the oil pressure sensor. I don't know if low oil pressure throws a fault code on the 90. Others on this forum will know.
    CHawk 25 DLX

  3. #3

    Default Re: 2010 Honda BF90D - Limp Mode Issues

    Continuing to eliminate things. Yesterday I checked the high pressure fuel filter. To my surprise, it was completely black and had a fine Sandy grit all over it. Apparently it was never changed - probably ever. I assumed when the shop did the complete service in June, they did all the basics like both fuel filters, both thermostats, etc etc. Probably bad for me to assume that. In any case, I changed it out and ran the boat for quite a while today with no issues. I will need to run it a few more times to feel confident that the height pressure fuel filter was the problem. I do still plan on changing out both thermostats because I’m not confident my shop did both. Thanks for the tips and I will let you know how things turn out.

  4. #4
    Join Date
    Sep 2008
    Location
    Hague, Virginia, USA
    Posts
    4,925

    Default Re: 2010 Honda BF90D - Limp Mode Issues

    A dirty fuel filter should not put the engine in LIMP mode (1800 rpm on the bigger engines.)
    CHawk 25 DLX

  5. #5

    Default Re: 2010 Honda BF90D - Limp Mode Issues

    My engine was doing the same thing, and was thinking it was going into "limp mode". Really it just couldn't get enough fuel after opening past 75% throttle or 4k. Chawk_man is correct in saying LIMP mode keeps engine at 1800 rpms.

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