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Throttle response issues on my 99 3.4L

Discussion in '1st Gen. Tacomas (1995-2004)' started by jonnyamerica99, Dec 5, 2017.

  1. Dec 5, 2017 at 2:49 PM
    #1
    jonnyamerica99

    jonnyamerica99 [OP] New Member

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    Jonny
    Woodstock, GA
    Vehicle:
    Tan 99 Prerunner TRD
    Cosmetic enhancements, 31" bfg KO's, AEM brute force intake, flow master 40 series w/ axle dump.
    I recently have been noticing a random hesitation in my throttle response when I hit the gas. I noticed this after my intake and Air Flow Sensor were replaced. I replaced the throttle position sensor as well. No check engine light. I cannot figure it out. Anyone have a clue?
     
  2. Dec 5, 2017 at 3:18 PM
    #2
    Madjik_Man

    Madjik_Man The Rembrandt of Rattle Can

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    Boulder County
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    1998 Ext Cab 3.4 4x4 TRD 5MT
    2004 DC 3.4 4x4 TRD
    Is there slack in the throttle cable? You can adjust it at the throttle body.

    And it seems like it would be pure coincidence, but maybe a dirty fuel filter?
     
  3. Dec 7, 2017 at 10:48 AM
    #3
    Greensystemsgo

    Greensystemsgo 1 owner with clean car fox.

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    Dirty Nickers
    Peoria, AZ
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    18 year old black taco...
    Bone Stock.
    I had this issue, twas my sparkplugs. I had replaced with a decent brand only ~15k miles before, but they were not what toyota called for and subsequently wore out much faster then expected. Lesson learned.
     
  4. Dec 7, 2017 at 11:00 AM
    #4
    wolfpackbd22

    wolfpackbd22 Well-Known Member

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    Scan your OBDII. Had a similar problem and it ended up being a misfire from bad spark plugs
     
    Dalandser likes this.
  5. Dec 8, 2017 at 5:55 AM
    #5
    cruisedon66

    cruisedon66 Well-Known Member

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    Pete
    Near St. Louis
    Vehicle:
    2003 Tacoma Extra Cab 2WD A/T
    Defrost mirrors, compass/temp display rear view mirror, rear wiper on camper shell, trans.cooler.
    Were the intake and airflow sensors replaced with quality parts? If not, the Ohm readings could be off. I've heard of "Universal" catalytic sensors not working properly because the wire from the connector to the sensor was a different length than stock. Throwing off the resistance.
    The hesitation problem most likely is directly related to the work done. Not plug wires, fuel filter etc. If you still have the old sensors. Do a diagnostic on them.
     
  6. Dec 8, 2017 at 6:38 AM
    #6
    Dalandser

    Dalandser ¡Me Gustan Las Tacos-mas!

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    Anthony
    Downey, LB
    Vehicle:
    08 PreRunner Regular Cab / 98 4x4 Extra Cab
    Empty Wallet Mod
    Yeah I'd start with testing out parts from any recent work done and go from there. These days there's really not much reason for anyone to not have a decent OBD-II app like Torque (android) or CarDoctor (iOS) on their phone. You can scan for misfires etc. Here's a quality, inexpensive wireless scanner that can be used with both of them:

    https://www.amazon.com/gp/aw/d/B00W0SDLRY/ref=ya_aw_oh_bia_dp?ie=UTF8&psc=1
     

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