2015 Cummins isx lope at idle while cold

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Petegraintrain, Dec 7, 2021.

  1. God prefers Diesels

    God prefers Diesels Road Train Member

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    Jun 26, 2020
    South Texas
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    Unless I'm going deaf, it just sounds like a cold diesel to me. Sounds really good. Much better than my ISX, that's for #### sure. Mine literally lopes cold for about 30 seconds like it's a small block with a wicked cam.
     
    bzinger Thanks this.
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  3. Petegraintrain

    Petegraintrain Bobtail Member

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    Sep 29, 2018
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    Engine is at running temperature
     
  4. 2016petedump

    2016petedump Bobtail Member

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    Mar 26, 2022
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    Did you get the rough idle figured out? I’ve got a 2016 that does the same thing until it gets to around 45F or 50F degrees outside.
     
  5. Petegraintrain

    Petegraintrain Bobtail Member

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    Sep 29, 2018
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    Sure did! Swapped that piece of #### out for a Signature 600
     
    lwlevens Thanks this.
  6. Petegraintrain

    Petegraintrain Bobtail Member

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    Sep 29, 2018
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    But no i did actually fix that lope. Had to get a different tune in it
     
  7. 2016petedump

    2016petedump Bobtail Member

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    Mar 26, 2022
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    Did the tuner say why the tune was making the truck run choppy when cold? Thanks for the info cus mine has been driving me nuts!
     
  8. Petegraintrain

    Petegraintrain Bobtail Member

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    Sep 29, 2018
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    Mine was deleted. I'm assuming yours is too? Because my truck was trying to heat up the SCR can even tho it wasn't on the truck anymore. So it wasn't properly deleted
     
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