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Thread: EGR Deleted 6.7L Runs very rough when cold

  1. #11
    Lifetime Member IdahoRob's Avatar
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    I can try it on my DD. I have played with the turbo vane position for start up, but haven't deleted the throttle valve. I can unplug and see what happens and then work through it if this is something customers are looking to do.
    2013 LML, 550hp with factory emissions, stock cp4 and compound turbos.
    2002 LBZ, 4x4 (Max'd Out) 6000lbs 9.36 @ 154 mph NHRDA Champion and Record holder
    1965 El Camino, duramax 9.6 @ 149MPH

    All EFI tuned by Adrenaline Truck Performance

  2. #12
    Lifetime Member Mitco39's Avatar
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    Just to follow up, unplugging the throttle valve fixed the idle when the engine was cold. Unfortunately it is to warm here now to really see how this affects the warm up of the engine in cold temps.

  3. #13
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    It should have nothing to do with the truck warming up if egr is deleted. The only thing it does is close the fresh air off causing the engine to suck air through the EGR system. If all that is gone then there is no need. I havent had a throttle valve on my truck in years.
    07.5 2500 Dodge Twin Turbos, Dual Pumps, Deleted, 100% over nozzles, Fletcher Bump Stick, and more goodies, Awaiting EFI Live Tuning

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  4. #14
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    Quote Originally Posted by Compcowboy View Post
    It should have nothing to do with the truck warming up if egr is deleted. The only thing it does is close the fresh air off causing the engine to suck air through the EGR system. If all that is gone then there is no need. I havent had a throttle valve on my truck in years.
    Are you running EFI Live on it ?

    If EGR is blocked off and the throttle valve closes, where does the engine get air from ?

  5. #15
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    It only closes for a split second. That's why you get a puff of white smoke and a stumble. The valve doesnt seal it off 100%. It's a very quick moving valve.
    07.5 2500 Dodge Twin Turbos, Dual Pumps, Deleted, 100% over nozzles, Fletcher Bump Stick, and more goodies, Awaiting EFI Live Tuning

    05 2500 Chevy Duramax, EFI Live Tuned

    01 2500 Chevy Duramax, ZF6, EFI Live Tuned

  6. #16
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    To clarify, there is no problem with removing the throttle valve when running EFI Live on a deleted engine ?

  7. #17
    Lifetime Member comnrailpwr's Avatar
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    The two I tuned were already unplugged from them running a h&s prior. Left them that way without any issues.

  8. #18
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    Yes that is correct. You will be better off IMHO to unplug that valve.
    07.5 2500 Dodge Twin Turbos, Dual Pumps, Deleted, 100% over nozzles, Fletcher Bump Stick, and more goodies, Awaiting EFI Live Tuning

    05 2500 Chevy Duramax, EFI Live Tuned

    01 2500 Chevy Duramax, ZF6, EFI Live Tuned

  9. #19
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    I have had no problems leaving the valve unplugged and disabling DTCs. I didn't try leaving it plugged in to find out what happens.

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