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Abrupt Lunge

Discussion in '2nd Gen Tundras (2007-2013)' started by BigDave75, Oct 10, 2021.

  1. Oct 10, 2021 at 6:35 PM
    #1
    BigDave75

    BigDave75 [OP] New Member

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    Hey everyone, got a question on my ‘12 Tundra with 83kish miles. Our driveway is steep and while slowly going up the driveway, making sure not to hit the camper at the top, most of the time I’m going slow and the vehicle will accelerate forward for whatever reason, when I’m not accelerating or barely stepping on the gas pedal, it does have the 5.7L Iforce V8, is this normal for the Tundras, something to do with the variable transmission? Thanks for all the info.
     
  2. Oct 10, 2021 at 6:51 PM
    #2
    azimuth

    azimuth New Member

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    Would you describe the acceleration as a surge? My parents had a Ford ltd that would surge forward suddenly. It would only do it for a second or two but was unpredictable enough that no one wanted to drive it. Never did figure it out. Even the dealer was stumped. I suspect it is the relationship between intake sensors and the computer
     
  3. Oct 10, 2021 at 7:02 PM
    #3
    BigDave75

    BigDave75 [OP] New Member

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    Yes, I’d consider it a surge, only does it while very slowly driving up my driveway.
     
  4. Oct 10, 2021 at 7:13 PM
    #4
    Retroboy1989

    Retroboy1989 'Course it's 4x4!

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    Snug top 20" TRD Sport wheels 275/60R20 BFG KO2s
    Try turning the A/C off and see if it still happens. Some cars get an idle up command when the compressor A/C engages.
     
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  5. Oct 10, 2021 at 7:47 PM
    #5
    Bakershack

    Bakershack Critical of Noncritical Thinkers

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    I haven't seen that in mine, but I don't have inch along very often.
     
  6. Oct 10, 2021 at 8:36 PM
    #6
    NueveTundra

    NueveTundra Internet Certified Forum Mechanic

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    Exterior: Toytec ultimate 3" lift level , GoodYear helper air bags , DayStar air bag cradles, AcanII smoked headlights, AcanII smoke Tail lights (2.5 gen style), DV8 front winch bumper , Badlands 12k winch , White AUTMATCH Shackles 3/4" D Ring Shackle, White AutoBots winch hook, Trail Ridge mirrors , 20x9 Creeps rims , 33x12.50r20 RoadOnes , Black Hart cross drilled n slotted rotors , Rigid flood flush mounts rear bumper , WeatherTec rain guards , OEM black side badges , Rigid Amber Radiance Pods. Energy Suspension Red Rack and Pinion Bushings, EAG front mesh Grille, RCI HighLift bed mounts. Rough Country DS2 Steps, A.R.E OverLand Canopy with Ascend basket, Stickers: ToyTec lifts windshield banner, Red Strange Music window sticker(back cab), White Strange Music sticker(back canopy), White Rigid sticker x2 (canopy sides), white Official BigFoot Research Team (Back Canopy) Interior: Alpine double din touch iLX-650 , JL C5-653's (front) JL C1-650x (rear) , JL JX400 4 channel amp , JL JX500 mono amp , 2 JL 12" subs , WeatherTec floor mats, Kenwood F/R Dash Cams, Under the Hood: Koyo all aluminum radiator, Mishimoto red silicon hoses , XS Power 3000 amp battery , LAlectric 300 amp Alternator , K&N replacement filter. Online LED store accessories Fuse/relay box. unknown Cat-Back exhaust.
    let me know how the AC thing works out.
    if it doesn't I'll do write up on things to do first to eliminate areas an get down to the bottom of it. Also if its constantly repeatable in that scenario , A video of both the "out side" and "gauges" would help.
    :)
     
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  7. Oct 11, 2021 at 2:17 AM
    #7
    CMikeB

    CMikeB New Member

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    I wonder if downshifting into 1 st gear going up the grade is the cause? I realize it's a pretty foreign concept for many Tundra owner's but next time, shift into 1st gear at the base of the hill. By choosing the gear yourself, the transmission won't have a chance to "change it's mind" suddenly!:thumbsup:
     
  8. Oct 11, 2021 at 4:41 AM
    #8
    PJR202

    PJR202 New Member

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    My 07 TacomaV6 did this. I didn't get too worked up about it, but finally searched around and found out.
     
  9. Oct 11, 2021 at 4:42 AM
    #9
    PJR202

    PJR202 New Member

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    OP are you sure it isn't just changing gears? Or are you going really, really slow? Then I woukd go back to the suggestion made about the AC compressor.
     
  10. Oct 11, 2021 at 5:19 PM
    #10
    BigDave75

    BigDave75 [OP] New Member

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    Ooo, good idea, I’ll try that, thanks.
     
  11. Oct 11, 2021 at 5:21 PM
    #11
    BigDave75

    BigDave75 [OP] New Member

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    Yes, I’m going super slow uphill, does it just before I brake.
     
  12. Oct 11, 2021 at 5:22 PM
    #12
    BigDave75

    BigDave75 [OP] New Member

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    A/C wasn’t on today and still did it.
     
  13. Oct 11, 2021 at 6:55 PM
    #13
    Willard

    Willard New Member

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    I park on an inclined driveway and mine does the same thing. It’s the transmission shifting while crawling under load.

    To prevent it I shift into first gear before coming up the driveway.

    My wife’s highlander does the same thing, and we used to have a Lexus gs300 that did it as well. All six speed auto transmissions.
     
  14. Oct 11, 2021 at 7:06 PM
    #14
    BigDave75

    BigDave75 [OP] New Member

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    Awesome, well thank you very much, is it bad for the trans to do this repeatedly?
     
  15. Oct 12, 2021 at 3:08 AM
    #15
    CMikeB

    CMikeB New Member

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    Automakers have had to include software in the transmissions to downshift with a brake-tap, when descending hills if the grade is steep enough. Today's drivers will do anything to avoid touching the shifter on their automatic transmissions. Toyota's Sequential or "S' Mode totally eliminates "shifting issues." Instead of needless heat building shifts with an unlocked Torque Converter,depending on speed and load, we have the option of choosing a gear that prevents it.
     
  16. Oct 16, 2021 at 1:55 PM
    #16
    BigDave75

    BigDave75 [OP] New Member

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    Hey all, just wanted to update everyone on this topic, Willard informed me I should shift the vehicle into 1st which did actually solve the issue of abruptly accelerating forward/(shifting). So thanks for all the input.
     
    NueveTundra likes this.

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