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SPN 1209/3821, Peterbilt 389

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Just.Do.It, Oct 25, 2019.

  1. Oct 25, 2019 #1
    Just.Do.It

    Just.Do.It Light Load Member

    55
    37
    Jul 23, 2018
    Tampa FL
    0
    Codes, again. Poping on and off, sometimes I reset them, and sometimes they just disappear. When codes are there, Turbo boost gauge stays around 17-19, doesn't get any higher, also torque is about 80% at best. After codes are cleared, everything is perfect ( well, almost everything ) for another 3K miles, then they pop up again. Stealership could not find any problem, probably because codes weren't there at the time. Codes popped up again, 2 days after, when I was hauling full load, so I had to reset them.

    Any ideas, anybody? Thank you in advance!
     

    Attached Files:

    Just.Do.It, Oct 25, 2019
    Just.Do.It, Oct 25, 2019
    #1
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  3. Oct 25, 2019 #2
    THEONEANDONLYMADDOG

    THEONEANDONLYMADDOG Bobtail Member

    22
    27
    Dec 8, 2013
    0
    EGR pressure sensor...
    Pull it clean it and check the orifice for blockage..

    One way to clean it out is a zip tie in a cordless drill and some PB Blaster and blow it out reassemble and clear codes and should fix it..
     
    THEONEANDONLYMADDOG, Oct 25, 2019
    THEONEANDONLYMADDOG, Oct 25, 2019
    #2
    Just.Do.It and Bean Jr. Thank this.
  4. Oct 25, 2019 #3
    THEONEANDONLYMADDOG

    THEONEANDONLYMADDOG Bobtail Member

    22
    27
    Dec 8, 2013
    0
    This also can cause a rich mixture and causes the NH3 or N0x sensor to soot up causing the SPN 3821
     
    THEONEANDONLYMADDOG, Oct 25, 2019
    THEONEANDONLYMADDOG, Oct 25, 2019
    #3
    Just.Do.It and Bean Jr. Thank this.
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