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Thread: 06 E38 LS2 Corvette with 6l80e unwanted throttle blip on downshift

  1. #1
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    Default 06 E38 LS2 Corvette with 6l80e unwanted throttle blip on downshift

    The engine is modified with big cam, heads and so on, the engine and transmission tune have also been modified. The problem is when decelerating to a stop in drive as the car downshifts into 2nd and 1st gear the engine rpm goes up just just enough to cause the car to jerk forward which can be irritating and dangerous. I don't think it is the transmission shifting I think the throttle is making an adjustment. It does not happen in sport mode when using the paddle shift. Ideas anyone?

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    Lifetime Member macca_779's Avatar
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    Default 06 E38 LS2 Corvette with 6l80e unwanted throttle blip on downshift

    You drilled the throttle didn't you?

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    Quote Originally Posted by macca_779 View Post
    You drilled the throttle didn't you?
    I cant speak for the OP, but all TBSS' do this stock from GM with the 4L70E. Needless to say, it is HIGHLY irritating and unsafe. As you are coming to a stop, the trans downshifts from 2->1 and jerks the truck forward. This happens around 2-3mph, so just as you are starting to remove full pressure from the brake pedal.

    But if it doesnt do it in Sport mode, to me that points at a tune issue/table. Post a log of it happening and the tune.
    ~Erik~
    2013 Sonic RS Manual - 1.4L I4T E78, starting the mods
    2008 TrailBlazer SS 3SS AWD Summit White - LS2 E67/T42, bolt ons, suspension, etc.
    2002 Chevy TrailBlazer LT 4X4 Summit White - 4.2L I6 P10, lifted, wheels, etc.

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    Quote Originally Posted by macca_779 View Post
    You drilled the throttle didn't you?
    No didn't drill the throttle.

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    Lifetime Member macca_779's Avatar
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    Default 06 E38 LS2 Corvette with 6l80e unwanted throttle blip on downshift

    Quote Originally Posted by RD in SD View Post
    No didn't drill the throttle.
    Interesting. Only seen this happen when guys over drill the throttle

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