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Irregular idle, help?

Discussion in '1st Gen. Tacomas' started by BrianPK, Feb 24, 2009.

  1. Feb 24, 2009 at 5:01 PM
    #1
    BrianPK

    BrianPK [OP] Offroad Enthusiast

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    Hey guys, havin another lil problem with my taco, i was wondering if y'all could help me out.

    my truck's idle is acting up. it started maybe.. 2 weeks ago? i'd start the truck and it would rev, and then shut off. start it again and it would run just fine if i pushed the gas a lil.

    that went away, and now my idle is high. cold, it ranges from 1200 to 2000. warm will range between 1000, and 2000. sometimes it will sit at 1000, i'll hit the gas and come to a stop, and it will sit at 1500, and it's even sat at 2000 a few times. i'm used to it idling at about 650-750 warm and about 1100-1300 cold. higher if the ac or defroster is turned on.

    it's irregular, regardless of how i drive it, or the weather conditions. it was about a quart and a half low... i just had the oil changed yesterday, but the problem is persisting. any ideas?
     
  2. Mar 3, 2009 at 12:03 AM
    #2
    BrianPK

    BrianPK [OP] Offroad Enthusiast

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    really? no one has had this issue before? It's getting worse... i'm not sure where to start
     
  3. Mar 3, 2009 at 5:52 AM
    #3
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Staff Member

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    Sounds like the IAC is broken..Is there a CEL?
     
  4. Mar 3, 2009 at 6:36 PM
    #4
    BrianPK

    BrianPK [OP] Offroad Enthusiast

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    No, the cel isn't on. that means no code... so what's the deal? is there a way to check? people have told me it could be either the tps, or the iac... but i don't know how to verify it without spending the $388 to replace them both
     
  5. Mar 3, 2009 at 6:38 PM
    #5
    JJ Customs

    JJ Customs Well-Known Member

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    Not enough to mention on this one. Give me time!
    Chris4X4 is the guy you want working on this but my 97 2.7 did that and it was the throttle positioning sensor.
     
  6. Mar 3, 2009 at 6:41 PM
    #6
    Toy4Life

    Toy4Life 668: The Neighbor of the Beast

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    Throttle position sensor..........that's my answer to all idle problems......it's a good place to start anyway. Disconnect it, clean it with electrical parts cleaner, wiggle it a bit, re-attach and see if that helps.
     
  7. Mar 3, 2009 at 6:43 PM
    #7
    tacomaman06

    tacomaman06 Carolina Alliance: Lead, follow, or get the hell o Staff Member

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    get a new gasket for the iac............and one for the throttle body. take them off and clean them, then put them back on and see what happens.


    by the way............................still got them damned coils dude!! what happened to ya???
     
  8. Mar 3, 2009 at 6:44 PM
    #8
    TRD4x4858

    TRD4x4858 Taco Traitor!

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    Sounds like a bad tps, try cleaning the IAC before you replace anything, but it does sound like the TPS is bad
     
  9. Mar 3, 2009 at 7:02 PM
    #9
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Staff Member

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    See, It could be Either the IAC or the TPS, both will give similar symptoms....
     
  10. Mar 3, 2009 at 7:07 PM
    #10
    Toy4Life

    Toy4Life 668: The Neighbor of the Beast

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    I'm gonna feel dumb when I hear the answer, but what is an IAC?
     
  11. Mar 3, 2009 at 7:09 PM
    #11
    HerNameIsLucy

    HerNameIsLucy I miss Lucy. :-(

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    Idle Air Control valve.

    I'd seafoam it first. Been known to smooth many an errant idle.
     
  12. Mar 3, 2009 at 7:09 PM
    #12
    tacomaman06

    tacomaman06 Carolina Alliance: Lead, follow, or get the hell o Staff Member

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    idle air control valve......under the throttle body.
     
  13. Mar 3, 2009 at 7:10 PM
    #13
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Staff Member

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    Idle Air Control. :)
     
  14. Mar 3, 2009 at 7:10 PM
    #14
    Toy4Life

    Toy4Life 668: The Neighbor of the Beast

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    ok...don't feel so dumb now...wouldn't have guessed it.
     
  15. Mar 3, 2009 at 7:15 PM
    #15
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Staff Member

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  16. Mar 3, 2009 at 7:18 PM
    #16
    Toy4Life

    Toy4Life 668: The Neighbor of the Beast

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  17. Mar 3, 2009 at 7:20 PM
    #17
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Staff Member

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  18. Mar 3, 2009 at 7:32 PM
    #18
    Toy4Life

    Toy4Life 668: The Neighbor of the Beast

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    :smack:My last post made me look dumber than I really am.....please disregard.:eek:
     
  19. Mar 7, 2009 at 3:23 AM
    #19
    BrianPK

    BrianPK [OP] Offroad Enthusiast

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    lol... i cleaned both the tps and the idle control, made things worse (idled at 2000) then i hit it witht he seafoam, and the problem went away. it drops slower than it did before, but rests happily at 750. funny thing though, i fixed the idle, and now my alternator light is on. i doubt it's related... but still. i thought this was a toyota. damnit
     
  20. Mar 7, 2009 at 3:28 AM
    #20
    BrianPK

    BrianPK [OP] Offroad Enthusiast

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    and as for those coils... i sent the check.. someone cashed it, i assumed they got lost in shipping. i'm a lil broke right now.. lookin for a job again. if you still have them when i get paid again, i'll gladly take them off your hands
     
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