Odd issue with Accelerator Pedal

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Brad.gribble, Nov 27, 2020.

  1. Brad.gribble

    Brad.gribble Bobtail Member

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    Nov 27, 2020
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    Looking for help from someone regarding a 1997 pierce pumper fire truck which won’t accelerate. Purchased for use on construction site and can’t get to accelerate. Truck has a Detroit 6V-92 engine and starts just fine. Issue is when in neutral, I can press accelerator and truck revs to 1000 rpm but won’t go higher. When in drive, won’t rev at all and idles at 600 rpm. It seems like there is a Gove or setting that is causing the engine to not rev. It is in “drive” mode, not pump so I don’t think it has to do with issues on the trucks pump system. It has an electronic gas pedal and I haven’t been able to figure out how to rev engine manually. Any help would be appreciated
     
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  3. Inderjit

    Inderjit Light Load Member

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    Sep 17, 2017
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    This would be a DDEC engine or "Detroit Diesel Electronic Control"if it has an electronic pedal.
    I would suspect that it has a max 1000 RPM setting for PTO mode. I would suspect there is a wiring problem or faulty switch limiting the RPM.
    You need someone who has the software to scan it.
     
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