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6nz cat loss of fuel mileage.

Discussion in 'Trucks [ Eighteen Wheelers ]' started by bigstank, Mar 27, 2013.

Page 2 of 2
  1. Apr 17, 2013 #11
    bigstank

    bigstank Light Load Member

    87
    19
    Mar 4, 2013
    missouri
    0
    I guess when cat rebuilt it 450k ago the must of had it 1 tooth off then the backlash of the idler just loosened up of time. It was hard for me to feel the power loss cuz of the PDI stuff but man its better now. I also raised thd fuel psi to 105-110 @ wot with the new spring and shim and put a new fuel valve
     
    bigstank, Apr 17, 2013
    bigstank, Apr 17, 2013
    #11
    NWAF and 110 ton heavy hall Thank this.
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  3. Apr 18, 2013 #12
    110 ton heavy hall

    110 ton heavy hall Bobtail Member

    23
    3
    Oct 17, 2012
    0
    thanks for the reply; i am going to check my timing the first chance i get.(which may be several days)you didn't notice your truck running a bit rougher? my motor has always had a pretty good vibration?
     
    110 ton heavy hall, Apr 18, 2013
    110 ton heavy hall, Apr 18, 2013
    #12
  4. Nov 10, 2017 #13
    Chavira

    Chavira Bobtail Member

    1
    0
    Nov 10, 2017
    0
    I have a 2000 379 with a 600hp 6nz 13speed and 336 tears running 24.5 low pros! I can baby it or get on it and it still gets 4.5 to the gallon! What can I do to improve that?
     
    Chavira, Nov 10, 2017
    Chavira, Nov 10, 2017
    #13
  5. Nov 10, 2017 #14
    benjamin260_6

    benjamin260_6 Medium Load Member

    433
    484
    Aug 8, 2012
    Ontario, Canada
    0
    How fast do you drive? And is that average just off the dash readout or is it a tank to tank average over a period of time like 30 days?
     
    benjamin260_6, Nov 10, 2017
    benjamin260_6, Nov 10, 2017
    #14
  6. Nov 12, 2017 #16
    bigstank

    bigstank Light Load Member

    87
    19
    Mar 4, 2013
    missouri
    0
    I just parked my peterbilt. I went out bought a new kenworth T660 by went from 5mpg to 7-8mpg now lol. Oh and this Cummins in this is deleted shhhhhhhh
     
    bigstank, Nov 12, 2017
    bigstank, Nov 12, 2017
    #16
    Oxbow Thanks this.
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