3406 runs ruff at start, lots of white smoke smooths out after warm up.

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Mad dog logistics llc, Nov 21, 2022.

  1. Nov 21, 2022 #1
    Mad dog logistics llc

    Mad dog logistics llc Light Load Member

    152
    37
    Jan 13, 2014
    0
    3406 5EK 1997 Pete 379

    When starting (its a little cold 30) it skips a lot and a lot of white smoke out of the pipes (smells like fuel) it will not go past 1100 rpms with a ruff idle. After a couple minutes it will smooth out and run normal no smoke, RPMS normal like nothing happened.

    No codes, there was a 21 flash code which I changed the boost pressure sensor because I had another truck act up with that code and it went away with the new sensor. That code came an went a bunch of times. Code hasnt came back yet.

    Im not the driver but when I start it up and move it around it doesnt seem to act the same way when its been warmed up.
     
    Mad dog logistics llc, Nov 21, 2022
    Mad dog logistics llc, Nov 21, 2022
    #1
  2. Truckers Report Jobs

    Trucking Jobs in 30 seconds

    Every month 400 people find a job with the help of TruckersReport.

  3. Nov 21, 2022 #2
    Jubal Early Times

    Jubal Early Times Road Train Member

    3,069
    20,586
    Oct 17, 2022
    0
    Leaking injector dripping fuel is most likely the culprit.
     
    Jubal Early Times, Nov 21, 2022
    Jubal Early Times, Nov 21, 2022
    #2
    Diesel Dave and Tall Mike Thank this.
  4. Nov 21, 2022 #3
    Mad dog logistics llc

    Mad dog logistics llc Light Load Member

    152
    37
    Jan 13, 2014
    0
    So once it burns off fuel in the cylinder then it will run normal. Anyway to identify the injector?
     
    Mad dog logistics llc, Nov 21, 2022
    Mad dog logistics llc, Nov 21, 2022
    #3
    Jubal Early Times Thanks this.
  5. Nov 21, 2022 #4
    Jubal Early Times

    Jubal Early Times Road Train Member

    3,069
    20,586
    Oct 17, 2022
    0
    That is correct. You can pull the manifold and the culprit will have a wet exhaust port. But you need to do that after it’s sat. You may can tell with a cylinder cut out test. Or you can pull all six and have them checked.
     
    Jubal Early Times, Nov 21, 2022
    Jubal Early Times, Nov 21, 2022
    #4
    cke, jaffles and Tall Mike Thank this.
  7. Nov 22, 2022 #5
    Raffito

    Raffito Light Load Member

    84
    53
    Aug 25, 2019
    Ingram, TX
    0
    You can also check the temperature on the exhaust manifold of each cylinder with an infrared thermometer or you can touch each with you hand once you start the engine. the one with faulty injector with have a big difference in temperature. You need to do this quick before engine smooths out.
     
    Raffito, Nov 22, 2022
    Raffito, Nov 22, 2022
    #5
    Jubal Early Times Thanks this.
  • Truckers Report Jobs

    Trucking Jobs in 30 seconds

    Every month 400 people find a job with the help of TruckersReport.