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'07 379 475 isx getting black smoke

Discussion in 'Peterbilt Forum' started by bts812, Sep 3, 2011.

  1. Sep 3, 2011 #1
    bts812

    bts812 Bobtail Member

    1
    0
    Sep 3, 2011
    0
    I have an '07 379 with an ISX 475, 13 speed. 3 to 4 weeks ago started getting black smoke when in 13th and trying to accellerate @ 1300-1400 rpm. If I downshift to 12th smoke goes away and manifold pressure comes back up. Has been getting progressively worse. Now smoking in top 3 gears below 1500. Manifold pressure at 20-25 until I downshift and rpms come back up to 1500 or above. Then manifold pressure jumps back up to 38psi . Replaced EGR 1 week ago. No improvement. Still loss of power and black smoke below 1500 rpm.

    Talked to Cummins, Peterbilt, etc and no answers yet. Has anyone been able to fix this problem?
     
    bts812, Sep 3, 2011
    bts812, Sep 3, 2011
    #1
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  3. Sep 3, 2011 #2
    ProduceHauler

    ProduceHauler Light Load Member

    231
    24
    Apr 28, 2011
    California
    0
    Aside of EGR-Valve itself there is one more element that is going bad almost as often - exhaust pressure sensor, there was bad batch of them and Cummins changed supplier at some point (or so I have heard). Your boost is too low, you killing the engine driving like that also producing a lot of soot that goes back into cylinders doing damage everywhere. If you need pictures where it is located and how to get it done let me know - I think I can find them from the time mine went bad
     
    ProduceHauler, Sep 3, 2011
    ProduceHauler, Sep 3, 2011
    #2
  4. Sep 10, 2011 #3
    ohsoslow

    ohsoslow Bobtail Member

    11
    2
    Aug 30, 2011
    0
    it could be several things. just about every sensor dealing with air temp, pressure, etc could cause these symptoms. the vanes in the turbo could be sticking. its really hard to say, your best bet is to get it hooked up to a computer and monitor sensor inputs.
     
    ohsoslow, Sep 10, 2011
    ohsoslow, Sep 10, 2011
    #3
  5. Nov 8, 2011 #4
    Toegrinder

    Toegrinder Bobtail Member

    1
    0
    Oct 25, 2011
    Grand junction, co
    0

    Hey produce, could I get those pics? Can you test the sensor to see if it is bad? I have an '05 isx and can not get more than 25 psi 98% of the time, and when does get above that it seems it is earlier in the morn. Cummins replaced the turbo, egr, and the box that controls the dump valve, no fixie :-/
     
    Toegrinder, Nov 8, 2011
    Toegrinder, Nov 8, 2011
    #4
  7. Nov 9, 2011 #5
    ProduceHauler

    ProduceHauler Light Load Member

    231
    24
    Apr 28, 2011
    California
    0
    Yes I can get to them not immediately though, sensors can be tested but in this case you can't test the thin pipe leading to it. Then even if it pass and pipe is clean - they can still be bad, so the only way to deal with it is to buy new one and get the old one out when checking the pipe. Mine was reading higher pressure then it really was - causing the turbo to run open wider (that means lower boost and higher EGT at times)
     
    ProduceHauler, Nov 9, 2011
    ProduceHauler, Nov 9, 2011
    #5
  8. May 11, 2021 #7
    Raisel81

    Raisel81 Bobtail Member

    1
    0
    May 11, 2021
    0
    My truck has this same issue. Could you fix it?
     
    Raisel81, May 11, 2021
    Raisel81, May 11, 2021
    #7
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