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Smoke while accelerating

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  • Smoke while accelerating

    Hi all,

    I’ve recently noticed that I’m rolling coal without trying to on acceleration along with a bit higher EGT’s…I’ve changed out the air filter in hopes that that may be the issue but it still seems to be doing it?

    The engine sees to be running great other than those issues I pointed out…

    WhT should my normal EGT’s be at under normal operations?? I seem to notice them at around 800-1000 degrees…

    Any help would be appreciated

  • #2
    How much boost / engine load? Mine runs high too, 800-1200 °F at 12-24lbs of boost and 60-85% engine load.

    I have not noticed any black smoke except on cold startup.


    • #3
      Well…come to find out I had a leak in ,y boost hose that turned into a large rip after hearing it pop!! Fixed now and runs good!! Last thing I expected but, who knew?? Thanks for the reply!


      • #4
        That was always the biggest thing on new builds we would see on Cummins Cruise... Guys would start to white smoke a bit and stumble and we would tell them to pull over and tighten up! We saw lots of loose boot clamps after about 100 miles after the boots broke in and softened up.

        Glad it worked out! Did it tear from rubbing or engine flex or?


        • #5
          Happened to me too, but I didn't have any noticeable smoke. I just noticed I wasn't pulling hills the same and had to shift more often.


          • #6
            I have had several blown intercooler connections over the years and it can really get your attention. Once on a camping trip leaving town and headed for the mountains in my newly swapped 5.9 cummins in my 85 Suburban, I blew an intercooler connection and it scared the crap out of me and then driving back home miles was slow, because I had zero power. It happened again in my 2017 Duramax last year in the middle of Nevada towing a 15k fifth wheel and again it scared the crap out of me and I was 50 miles from nowhere and the clamp that blew off was a crimped steel ring that couldn't be put back on. It was a PIA and took some creativity to make a repair.