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  1. #1

    02 F12 4000 rpm max in water! why?

    My 2002 F12 non turbo will only rev to 4000 rpm max in the water. Out of the water its fine and revs normal but in the water no so much. Iv had it in the Honda shop and an independent shop and no one can fix it. Between the two shops they have had it for 7 months. They have checked the brain, compression , heads, exhaust, fuel and fuel sys, fuel regulator dash cluster, new wire harness ………when does it stop?
    Could it be the bearings to the impeller shaft? What all could this possibly be? 2 shops and no answers!!!


  2. #2
    xdrian's Avatar
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    4k max

    I know you said it will rev only to 4 K in the water so asume that it rev more that that out of the water eg 6k not 4500 rpm ??

    If so sounds like it is in limt mode maybe to easy fix but take a look.

    Regards Xdrian

  3. #3

    Yeah limp mode isnt the problem.

    Quote Originally Posted by xdrian View Post
    I know you said it will rev only to 4 K in the water so asume that it rev more that that out of the water eg 6k not 4500 rpm ??

    If so sounds like it is in limt mode maybe to easy fix but take a look.

    Regards Xdrian
    i even had Honda try a new dash cluster to see if it was stuck in limit mode... its got to be a sensor of some sorts.

  4. #4
    glockm22's Avatar
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    Try checking the TCP sensor, also look at wastegate and all the hoses to it.

  5. #5
    JRINJAX's Avatar
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    Check and see if every plug tip looks the same. You might have a bad coil or ECU. You might want to check compression yourself if you haven't already. You also might have a bad injector.
    The best way to troubleshoot it is to move parts from it to another '02-'03 and see when the problem moves...

  6. #6

    Smile fix ya prob

    [QUOTE=fixmyhonda;1351699]My 2002 F12 non turbo will only rev to 4000
    change your plugs i had same problem with my 07 f12x turbo ski new plugs a bang she roared

  7. #7
    [QUOTE=blowjob;1386774]
    Quote Originally Posted by fixmyhonda View Post
    My 2002 F12 non turbo will only rev to 4000
    change your plugs i had same problem with my 07 f12x turbo ski new plugs a bang she roared
    mine is doing the same thing
    I talked to someone and they said if I
    put new plugs in it b4 I started it for the 1st time of the season
    (while all the winterizer junk was in the cylinders) that I fouled out the new plugs

    I'm going to test it with the old plugs 2maro.. if it works I'll let ya know..

  8. #8
    JRINJAX's Avatar
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    I hate to tell you but 3500-4K is also what it will turn with the turbo locked up. Pull your boost control tube and see if it goes into overboost when you hit the throttle on the water. If it doesn't, pull the turbo inlet duct and very carefully see if the fragile compressor wheel will spin with your fingers ONLY.

  9. #9
    Quote Originally Posted by JRINJAX View Post
    I hate to tell you but 3500-4K is also what it will turn with the turbo locked up. Pull your boost control tube and see if it goes into overboost when you hit the throttle on the water. If it doesn't, pull the turbo inlet duct and very carefully see if the fragile compressor wheel will spin with your fingers ONLY.
    THANKS! thats what it was for mine just did a quick turn with a 9mm socket and it runs like new

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