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09 6 speed. Weird "jerk" while slowing down?

Discussion in '2nd Gen. Tacomas (2005-2015)' started by xxaarraa, Mar 6, 2012.

  1. Mar 6, 2012 at 11:12 AM
    #1
    xxaarraa

    xxaarraa [OP] Well-Known Member

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    I always coast to stop lights in whatever gear I am in and clutch in at the last minute. Off late, as I am doing this, I notice a jerk right as the RPM falls below 1200. It feels very similar to the torque converter locking up in an auto tranny, same sort of jerk/release feeling. However, I have a 6 speed and wondering if this is a bad symptom. Anyone?
     
  2. Mar 6, 2012 at 11:50 AM
    #2
    TotalBrutal

    TotalBrutal Well-Known Member

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    ^^ This

    I feel the exact same thing when engine braking and RPM falls low. Completely normal.
     
  3. Mar 6, 2012 at 12:34 PM
    #3
    fixer5000

    fixer5000 the logical one

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    i found that annoying when i first got my truck. thought something was wrong with it
     
  4. Mar 6, 2012 at 12:52 PM
    #4
    LUSETACO

    LUSETACO Here for the Taco Pron

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    Yes
    I've learned the timing of this and can usually can engage the clutch just as it's about to surge. I will agree though, kind of annoying, but something you get used to.
     
  5. Mar 6, 2012 at 12:58 PM
    #5
    LUSETACO

    LUSETACO Here for the Taco Pron

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    Yes
  6. Mar 6, 2012 at 1:05 PM
    #6
    jjew18

    jjew18 the Nightman cometh!

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    It's called your brakes.
     
  7. Mar 6, 2012 at 1:09 PM
    #7
    jjew18

    jjew18 the Nightman cometh!

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    Like they said, normal for an auto, I'm not sure if it is the same for manual. I am not saying it is or isn't, just personally don't have any experience with a manual Taco and don't recall anyone with manuals complaining about it.

    Until now. If it is the same OP, it is completely normal.
     
  8. Mar 6, 2012 at 3:22 PM
    #8
    xxaarraa

    xxaarraa [OP] Well-Known Member

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    Thanks folks, appreciate the comments. I heard vaguely something about the engine "speeding" up to keep from stalling out, so maybe I should try this in an open field and see what happens. Either way, I am not going to worry thanks to your comments.
     
  9. Mar 6, 2012 at 6:07 PM
    #9
    iroh

    iroh Well-Known Member

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    As said, it's the DFCO. The jerk matches exactly to when it goes open loop on the ultragauge.

    Its behavior goes as follows:

    The conditions for fuel cutoff to start are to be over 1600 rpm, clutch out, and 2 seconds passed since last throttle input. To make sure it always gives your fuel cutoff give throttle a little blip when you downshift. That also means if you let off in gear to slow down there's a 2 second delay before you feel that "jerk."

    DFCO is cancelled either when rpm falls under 1200 or if there is ANY throttle input under 1600 rpm.

    Not the easiest system to manage :rolleyes:

    Kinda wish they'd take a page out of Honda's book. Their DFCO: throttle off over 1200, fuel is cut... period.
     
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