Truck surges on startup from cold, fine after running a few minutes

Discussion in '6.0L PowerStroke Engine & Drivetrain' started by tmuller, May 4, 2017.

  1. gordbb

    gordbb SDD Junior Member

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    Mine does the same thing when it's really cold I would like to figure it out as well.
     
  2. DaveBen

    DaveBen SDD Senior Member

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    Of you are running 15-W40 oil try changing to to 5-W40. Stopped my surging.
     
  3. tmuller

    tmuller SDD Junior Member

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    I have been running 5w30 Amsoil diesel oil now for nearly 2 years in all weather. I can't imaging it's the oil.

    I'm down to 2 things.

    1) it's a sensor that is not working correctly when the truck is warming in the morning during glow plugs running
    2) due to glow plugs running, there isn't a correct voltage detected by the VR on the alternator (one I am not monitoring) and the truck thinks it needs to charge / not / charge / not / etc.

    Next step, going to run a tap to the wire on the alternator directly to battery voltage and bypass the computer to see if there is something there BEFORE I go off and start replacing sensors.
     
  4. DaveBen

    DaveBen SDD Senior Member

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    What year of truck do you have? Add this to your signature so we won't have to ask.
     
  5. tmuller

    tmuller SDD Junior Member

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    06 F350 Crew Cab. Again, this only started after putting in the new alternator.
     
  6. bismic1

    bismic1 Full Access Member

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    Updates?
     

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