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mt555b

  1. Repair & Technical Discussion
    I need some help with my Challenger MT555B. It has the Cat motor. Runs good, lots of power. New glow plugs, injectors and pump within past 12 mo. At low idle (1200 RPM or less) the motor "loops" or "cams". It does not do it all the time just once its warm and not under load. Any ideas??
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