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Thread: Smoke at idle and haze through rpm range

  1. #1
    Junior Member
    Join Date
    Dec 2012

    Default Smoke at idle and haze through rpm range

    Hey guys, I have a 07.5 6.7 deleted.

    I've installed industrial injection R2 injectors and an 85% over cp3. Truck has a lift pump, head studs, 5" exhaust, and a really nice trans tune. I have also milled off the stock intake manifold and installed a b&b tooling intake manifold. Stock everything else.

    The biggest concern is that I'm sick of it smoking at idle. I've tried a lot of things: rail pressure, injection amount, duration. I'm getting no where.

    Ive talked with tuners, they think it's just not getting enough airflow. There's no way, to me that's the problem with idle. If anyone can point me in any kind of direction, that would be great.


  2. #2
    Join Date
    Oct 2014


    Timing is the biggest thing for keeping smoke down at idle and cruise.

  3. #3
    Junior Member
    Join Date
    Dec 2012


    I'm using the timing calculator. How far out is generally safe for adjustment?

  4. #4
    Lifetime Member THEFERMANATOR's Avatar
    Join Date
    Mar 2009


    For idle and off idle the calculator doesn't work. Your going to have to work with it until you find what it likes. Your going to need to increase pressure at idle. But my experience has been pilot tuning is the key. On bigger 8njectors, SMALL changes to pilot make BIG changes to the overall tune. I'm only running 45 overs in my Duramax, but it hazed something awful, I cleared most of it up by getting the pulse tables so the idle fuel amount was close to stock, and fine tuning pilot amount and timing.
    1995 GMC 2500 SUBURBAN powered by 01 DURAMAX/ALLISON, little of this, a little of that,
    DIAMONDEYE 4" exhaust, CORSA muffler, AFE stage 1 dry filter, custom tuning by me, KENNEDY single pump and pump rub kit.

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