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idle RPM fluctuation

Discussion in '1st Gen. Tacomas (1995-2004)' started by shepnuts, Jan 28, 2012.

  1. Jan 28, 2012 at 5:19 PM
    #1
    shepnuts

    shepnuts [OP] Member

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    I have a 2001 tacoma sr5 4X4 that has a 3.4 liter V6 from a 2004. Ever since we swapped the motor, the idle will sometimes run at like 1500rpms for several minutes (like 10 or more) after starting. Or sometimes after starting it runs so low that you have to give it gas for awhile to keep it running. Today it wouldnt start at all without feathering the gas pedal. Where should I look? Thank you for any advice..
     
  2. Jan 28, 2012 at 8:11 PM
    #2
    pyroskier

    pyroskier Well-Known Member

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    Jacob
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    Try cleaning the mass air flow sensor and the o2 sensors with some contact cleaner, and maybe try pulling the EFI fuse. Disconnect the battery and reset the computer. Maybe it needs to have the comp reset. How long has it been since the swap? (miles)?
     
  3. Jan 28, 2012 at 8:15 PM
    #3
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    FlimFlubberJAM
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    check the IAC (idle Air Control)
     
  4. Jan 28, 2012 at 11:09 PM
    #4
    shepnuts

    shepnuts [OP] Member

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    Ok thank you so much, I will do these things along with checking the AIC. There are about 15k on it since the swap. Most of the time it idles just fine after warming up, but it almost always needs a little gas at first to warm up and run on its ownn..
     
  5. Jan 29, 2012 at 12:47 AM
    #5
    TacoMX

    TacoMX TW's Official anti body-lift pundit

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    X2. You can try and clean it w/ some contact cleaner, but usually if its bad, it needs replaced.

    The way you test it is to take the valve off the TB (throttle body), keep it plugged into the wiring harness and turn the key on (dont start it) and see if the little valve moves inside the IAC. If it does, its good. If not, its toast.

    I would also clean the MAF and the TB to see if that helps.
     
  6. Jan 29, 2012 at 11:00 AM
    #6
    shepnuts

    shepnuts [OP] Member

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    Thanks so much for the info and speedy responses!
     
  7. Jan 29, 2012 at 11:05 AM
    #7
    Madjik_Man

    Madjik_Man The Rembrandt of Rattle Can

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    About 25 pounds of spray paint and vinyl dye
    I'll throw in my standard response (based on my experience)

    My throttle position sensor was shot and it would idle high, it would idle low... etc
     
  8. Jan 29, 2012 at 11:09 AM
    #8
    The Driver

    The Driver Trail Runner/Barefoot Beach Runner/Snow Skier

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    Bit of a thread jack...

    Mine started idling between 500 and 750 on Friday. A bit annoying, but it accelerates smoothly, any ideas?
     
  9. Jan 29, 2012 at 11:36 AM
    #9
    TacoMX

    TacoMX TW's Official anti body-lift pundit

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    read just about every post above yours.
     
  10. Jan 29, 2012 at 12:14 PM
    #10
    The Driver

    The Driver Trail Runner/Barefoot Beach Runner/Snow Skier

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    Aftermarket tranny cooler, 5100 Series Bilsteins, ToyTec Bilstein front coilovers, SPC UCA's, Alcan leafs, Class 3 Hitch, Alcan Leafs,
    I was afraid that would be the answer...

    Oh well, search for the write ups, here we go...
     
  11. Mar 22, 2012 at 6:41 AM
    #11
    TIPICOTACO

    TIPICOTACO Well-Known Member

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    Tyler
    nw nj
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    '01 DC 4X4 TRD "RAD BARON"
    Some lift, some armor, some scratches..
    subbed.. my idle also surges from about 900 - 1100 rpm upon start-up, but typically levels out to around 750 after she's warmed up.. truck runs perfect otherwise

    I'l look into all the above, thanks :)
     
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