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  1. #1

    2004 Aquatrax R-12X misfiring/drops cylinder under load.

    Hello everyone, this is my first time posting to this forum. My 04 aquatrax r-12x starts up fine and idles okay, bounces from 1200 to 1600 rpm. At 2000-2400 rpm the engine shakes a bit. And at WOT it revs fine and a couple seconds later it feels like one of the cylinders stops firing. I've replaced spark plugs with the NGKs, have 93 octane, swapped coils with another aquatrax, rebuilt pump bearings but nothing seems to happen. No codes, no FI light, fuel pump is working. I made sure the turbo and wastegate/wastegate actuator are working. I'm clueless as to what could be happening. If someone could help I would greatly appreciate it.

  2. #2

    Join Date
    Aug 2013
    Have you checked to make sure that you are not in Limit Mode? This would limit the speed to 35mph.

  3. #3
    Yes, even if I was in limit mode it shouldn't be dropping cylinders and shutting off in the middle of the water.

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