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Engine hesitates on acceleration?

Discussion in '2nd Gen. Tacomas (2005-2015)' started by GasTiresOil, Jul 16, 2011.

  1. Jul 16, 2011 at 4:28 PM
    #1
    GasTiresOil

    GasTiresOil [OP] Glockin

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    Only between 50 to 65 mph. Most noticeable if i mash the gas., the tranny downshifts and the engine stutters and accerates slowly before leveling out and just going normal. The only other time I notice a similar issue is at a dead stop the idle will drop low and then back up.

    08 TRD OR with 33k. New plugs air and fuel filter are 3k miles old. Any ideas what this could be?

    Edit to add: yes, I tried the search function.
     
  2. Jul 16, 2011 at 4:38 PM
    #2
    BradleyScottETC

    BradleyScottETC Class IV Category 8 Elite VIP Member (Only)

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    There is a tranny TSB for weird shifting in the 15-20mph range, that 50-65mph problem sounds normal to me.
     
  3. Jul 16, 2011 at 4:43 PM
    #3
    Lucario Runner

    Lucario Runner Resident SUV racer

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    Seems like drive by wire behavior to me.
     
  4. Jul 16, 2011 at 8:25 PM
    #4
    GasTiresOil

    GasTiresOil [OP] Glockin

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    Which means what exactly?
     
  5. Jul 16, 2011 at 8:29 PM
    #5
    08pretaco

    08pretaco Almost there

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    That its not a direct wire from the skinny pedal to the throttle body. Its a module that relays a signal from the pedal to the throttle body which causes a delay in the response which causes a slight hesitation..
     
  6. Jul 16, 2011 at 8:41 PM
    #6
    Lucario Runner

    Lucario Runner Resident SUV racer

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    ^this. We don't have a throttle linkage that is connected to the gas pedal to the throttle body. What happens is you put your foot down for the demand for more power, the signal then runs to the ecu saying that there is a demand for more power, the ecu does checks for things like what gear your in, how fast your going, the amount of revs or current load on the engine, checks the traction control for slip, and after the series of check it then sends a signal to the throttle body to open more and if necessary downshift a gear or two. I have heard good things about this unit but it is expensive. http://www.urdusa.com/Electronics-P...ooster-Throttle-Accelerator/product_info.html
     
  7. Jul 16, 2011 at 8:44 PM
    #7
    08pretaco

    08pretaco Almost there

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    ^that in more depth from what I said lol

    So as you can see why the hesitation.
     
  8. Jul 16, 2011 at 8:47 PM
    #8
    Lucario Runner

    Lucario Runner Resident SUV racer

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    yeah its a pita ain't it? lol
     
  9. Jul 16, 2011 at 8:49 PM
    #9
    08pretaco

    08pretaco Almost there

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    Are the 1st gens the same way? Or did they change it going to 2nd gen?
     
  10. Jul 16, 2011 at 8:52 PM
    #10
    Lucario Runner

    Lucario Runner Resident SUV racer

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    1st gens don't have it. they changed it for the 2nd gen taco in 05 and was on the 4runner since 03 (4th gen) :( Although most if not all new cars are running this system some have very instant reaction.
     
  11. Jul 16, 2011 at 9:14 PM
    #11
    GasTiresOil

    GasTiresOil [OP] Glockin

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    It just started doing this. I never had this issue before, it began with a slight stutter as I was driving at around 50-65 and just giving regular gas pedal to keep with traffic. I might have not explained it too well in the original post... the issue is not with a delay in throttle response, it's a stuttering and lack of accelaration. The truck stutters, and it feels like it starts to go then stutters, then feels like it going then stutters, then finally it has power and starts to move.

    It's not an issue I've had with this truck before, which is why I'm concerned.
     
  12. Jul 16, 2011 at 9:17 PM
    #12
    Lucario Runner

    Lucario Runner Resident SUV racer

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    Try disconnecting the battery for 10 mins and see if that makes a difference. Is your truck showing any codes? I'm also curious how did you change the fuel filter?
     
  13. Jul 16, 2011 at 9:21 PM
    #13
    08pretaco

    08pretaco Almost there

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    I recommended yhat in another similar thread and they completely disregarded that suggestion lol

    If it was a fuel filter I think the problem would occur at start up not so lik already driving, could be wrong though
     
  14. Jul 16, 2011 at 9:33 PM
    #14
    Lucario Runner

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  15. Jul 16, 2011 at 9:35 PM
    #15
    08pretaco

    08pretaco Almost there

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    I understamd what your saying but won't a clogged filter cause problems way before you hit 50 mph, ie startup. If the filter clogged how's the ngine going to get fuel to allow you to hit 50mph?
     
  16. Jul 16, 2011 at 9:47 PM
    #16
    Lucario Runner

    Lucario Runner Resident SUV racer

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    It can but it won't be as dramatic. When you start your truck you turn the key on and it primes the system so you'll have sufficient fuel pressure for start up. To the op have you cleaned your maf sensor as well? if not that might help out as well.
     
  17. Jul 17, 2011 at 6:16 AM
    #17
    GasTiresOil

    GasTiresOil [OP] Glockin

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    My bad on the fuel filter:eek:, that was a different car I just did that with and wrote it down here. I have not cleaned the maf, just the throttle body. About a month ago, some buddies to eff with me opened my hood and unplugged the maf. When I got in to go home the truck was going haywire. I noticed it right away, plugged it back in, disconnected the battery and have been good ever since.

    Its just odd that now I notice this problem after the maf issue I had.
     
  18. Jul 17, 2011 at 8:32 AM
    #18
    extremachn1

    extremachn1 I am an asshole, deal with it!

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    Toyota must have some delay built into the throttle systems on purpose. Having worked with automoive can-bus, fiber optics, and electrical signals my whole life I can garentee that the signals get from point A to point B and processed in 1/10's of seconds if not faster. In reality there should be almost no convievable delay.

    Is this just a automatic issue? I have had 2 manual tacomas and didnt ever notice it. Secondly, I have the S/C and there definatly is NOT a lag when I step on the gas. I wonder if the S/C reflash changes the built in delay.

    Just curiosity and food for thought.
     
  19. Jul 17, 2011 at 8:36 AM
    #19
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    How "low" is the idle? Normal is around 550 rpm when warm. As for the delay, does it "stutter", or simply lag when getting on it? At 50-60 MPH, the tranny (if in 5th gear) goes from 4th, then 3rd, depending on how much throttle is applied. This can cause a "lag".
     
  20. Jul 17, 2011 at 8:48 AM
    #20
    darkgreentaco

    darkgreentaco XXXL Member

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