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’91 F250 7.3 diesel

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  • November 30, 2016 at 9:26 pm #872883
    mike boggessmike boggess
    Participant

      Recently my truck has developed a sputtering symptom. When the truck first starts up it runs perfect, after the high speed idle kicks off it sputters and blows greyish smoke. Truck drives fin,smoke disappears. The truck has become hard to start as well, takes much longer to crank up Any ideas?

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    • December 2, 2016 at 6:07 am #872957
      GregGreg
      Participant

        One or more bad glow plugs?

        December 2, 2016 at 7:06 pm #872974
        mike boggessmike boggess
        Participant

          My mechanic has it now and that is what he suspects as well, would that make it turn over more often before it starts, could it be the glow plug regulator?

          December 2, 2016 at 8:56 pm #872980
          James P GrossoJames P Grosso
          Participant

            When cold, after startup, drive it pretty hard to build boost. The boost builds heat, and if it starts running normal, then it is likely the glow plugs.

            December 2, 2016 at 9:03 pm #872981
            mike boggessmike boggess
            Participant

              Thanks for your quick reply, we will start there. Will report back.

              December 30, 2016 at 11:30 am #874080
              Nick WarnerNick Warner
              Participant

                Is this a turbo motor? By my memory the 91 was an NA IDI engine. Had an 89 F350 with the same setup. The glow plugs get going bad and usually take out the glow plug relay. That relay is the same part type as the mag switch for the starter. Replace it when you do the glow plugs, and also get the new wiring harness with the valve cover gaskets. Running as many amps as glow plugs do coupled with putting the wiring harness under the vanve cover makes it worth your time for a relatively cheap part to replace all of it if you are going to open it up and dive in.

                December 31, 2016 at 2:45 am #874123
                MikeMike
                Participant

                  I’m wondering about the grey smoke at idle. Might be an “overfueling at idle” condition, caused by a flakey injector and/or poor spray pattern.

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