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  1. #1

    2006 aquatrax r12x won't go over 4200 rpm

    006 aquatrax r12x won't go over 4200 RPM
    New ....
    wastegate solenoid
    Plugs
    Air filter
    Oil change 4.3 quarts
    Both coolant/oil temp sensors
    ------------
    Turbo turns freely lube w crc 556
    Wastegate actuator checks out with air force and diaphragm holds with slight vacuum .
    All lines and hoses checked for pinholes, dryrot, splitting
    --------------
    Ski runs/starts perfectly but limited to 4700 rpms
    No codes
    ----------
    Double check the pill in vacuum hose
    Ground oil pressure sensor and works
    Pull exhaust manifold and pressure test inspect all turbo parts while disassembled.
    All new gasket set when reassembling engine
    Again new oil 4 quarts then lowering to 3 quartz
    Still same thing 4200 max rpms and runs perfect for hours. No codes
    It has to be in a limp mode as if too much oil
    It's not in the restricted mode for beginners I have put it there and it revs to the same rpm but then starts cutting out like it supposed to.

    Totally frustrated what can I try next my brothers on skis

  2. #2
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    Put a boost gauge on and take a reading at 4700 RPM and report back.


  3. #3
    In the water or out....i have 8psi on the trailer

  4. #4
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    You should take the reading in the water.

    8 psi boost on the trailer seems to be abnormally high. You should not be revving the motor on the trailer in the first place. Itís not good for the ski.

    There is a possibility that you have a case of a shared key on the fly wheel which would give you reduce ignition lead this would cause higher boost at lower loads. But letís not guess, take the reading at 4700 RPM in the water and report back.

    Also, I assume you have ran a compression test on this engine and all cylinders are equal At or close to 170 psi while holding the throttle open during testing.

  5. #5
    In the water 4700 rpm......6psi
    Good compression
    Last edited by Kevlarss; 05-21-2019 at 08:53 PM.

  6. #6
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    When you disconnect the line going to the waste gate actuator does the ski Over-boost? It should easily spike to 12 PSI and try to shut down. Do this in the water and be warned it should try to shut off instantly.

    Do that, take the reading and report back.

  7. #7

  8. #8
    Mr nitro there was no differences when disconnecting vac hose from wastegate, when ski is out of water it will spool up to 7000 plus rpm until cutoff is reached .. You can hear turbo whine, remember I pulled off the turbo and split it. I examined the compressor wheel blades. I removed wastegate and rem0ved wastegate actuator. Waste gate valve is freely operating I even cleaned carbon and valve seat.....when actuator is installed valve is slammed shut you can't even open it by hand.only air pressure to actuator will open valve

  9. #9
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    There is your problem, little or no boost. Possibly -bad turbo, or leaky intake or exhaust. Revving the ski up under no load on the trailer is meaningless and could do harm to your ski.

    What technique did you use when you checked compression and what were the 4 cylinder numbers you got?

  10. #10
    Mr nitro remember I get 6psi at 4500 now I'm thinking ecu limits rpm. I do have a turbocharger pressure sensor TCP on the cooler, should I change it?

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