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  1. C

    M1078 runs slow

    Replaced the HEUI pump last month. Still runs slow. Took it to CAT yesterday. Said bad HEUI again. Replacing with CAT HEUI. Will know in a few hours if THAT fixed it. At least that’s what the tester is saying it is.
  2. C

    M1078 runs slow

    Thanks. Will try that.
  3. C

    M1078 runs slow

    Yes. All flushed but did not replace injectors. Having a friend join this thread soon who coordinated repair who can explain why injectors were not replaced this time.
  4. C

    M1078 runs slow

    Yea, typo. Heui pump. Replaced it because other one went bad and truck would not crank. Got it running again with new pump installed at a diesel shop though but later developed another issue of truck running slow and speed limited.
  5. C

    M1078 runs slow

    Our M1078 is currently speed limited to about 25mph. Had a huey pump issue and replaced it. Is there a speed sensor somewhere limiting the speed?
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