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  1. NDT

    Code 71 engine speed sensor circuit low

    If you are 100% certain you have good bubble free clean plentiful fuel flow to the ip and unrestricted return lines, and If you are 100% certain you have uninterrupted 24 volts to the ip, And your ip is over 10 years old, it's time for an overhaul.
    • NDT
    • Post #16
    • Forum: HMMWV
  2. NDT

    Code 71 engine speed sensor circuit low

    Sure. You said: " I already checked gas tank, fuel lines from tank to pump to filter (put in a new filter) and return lines. All are good with clean gas. " Knowing this, the symptoms you describe (stalling, no power, sometimes idles bad) are those of a failing injection pump.
    • NDT
    • Post #14
    • Forum: HMMWV
  3. NDT

    Code 71 engine speed sensor circuit low

    Your injection pump is shot.
  4. NDT

    Code 71 engine speed sensor circuit low

    The injection pump solenoid has to get 24 volts for the engine to stay running. The circuit powering this solenoid is completely unrelated to any circuits related to the 4L80E.
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