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?
     
  7. Ziefer92

    Ziefer92 Full Access Member

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    Bumping for any update. My brother is having almost the same problem but right after the change oil, surging at cold start for a couple of weeks now. He's thinking it's the alternator. We will take a look at it right after the smittybilt bumper and new tires installation on our current Jeep project. Any chance your new alternator is acting up?
     
  8. DaveBen

    DaveBen SDD Senior Member

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    These engines are known to surge when cold starting. This is due to the oil, 15W 40 is what the factory puts in. I changed to 5W 40 and the surging went away. I have never heard of the alternator causing surging.
     
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  9. Ziefer92

    Ziefer92 Full Access Member

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    Thank you for the tips, Dave. We'll see if changing to 5W 40 would eliminate it.
     
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  10. DaveBen

    DaveBen SDD Senior Member

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    Best of luck to you!
     

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