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High idle on startup

Discussion in 'Technical Chat' started by beachtaco, May 19, 2010.

  1. May 19, 2010 at 2:48 PM
    #1
    beachtaco

    beachtaco [OP] Member

    Joined:
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    First Name:
    John
    New York
    Vehicle:
    95 6 cyl 5 spd
    I recently purchased a 95 Tacoma 6 cyl 5 speed, 105 k. I'm very pleased with the truck, but have one concern, The truck idles at 2000 rpm, unless completely warmed up. I bought in January while it was still cold, but we've hit a couple of days close to 80 recently, and it still idles high on startup. I'm just wondering if this is normal or in need of repair. Thanks for all help.
     
  2. May 20, 2010 at 9:10 AM
    #2
    BlueT

    BlueT Well-Known Member

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    I moded 1999 Taco so much it had turned to Land Cruiser
    Start by cleaning throttle body especially idle valve. that should help unless your idle valve or Temp engine sensor (ECT) is bad.
     
  3. May 20, 2010 at 9:34 AM
    #3
    mjohn617

    mjohn617 Well-Known Member

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    Petaluma, CA
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    05 DC TRD sprt silver
    Toytec ULK, OME Dakar leafs, LED conversion, RBP sidesteps, Nitto Trail Grapplers, AR ATX Artillery 16" wheels, Doug Thorley LTH/Pipe Bomb, TRD Exhaust W/Classic Chambered Powerstick, Lightend Flywheel
    Even if it is 80 outside with a cold start, your engine is going to start in a "open loop mode". your engine will have no feedback from any sensors (O2) , cold map, and timing, including your Idle Air Control Valve. Untill your truck warms up and goes into "closed loop" and starts recieving sensor signals your IACV will not respond, it just goes to what setting it is told at startup. If you do suspect that it is pretty high RPM on startup, just like beachtaco said, you probably need to check your IACV and clean it.
     
  4. Oct 5, 2010 at 7:48 PM
    #4
    dustinclm

    dustinclm Well-Known Member

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    Thibodaux, La
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    2012 Super White DC 4x4 V6
    Bilstein 5100 set at .85" WeatherTech Floor Mats
    i have a similar problem...when my motor is cold the truck gets into really high RPMs before it will shift, it just doesnt seam right to me...mainly in the winter months though, not so bad during the summer....i was looking to clean the Air control valve and the throttle body idle valve...can anyone tell me where these are located? thanks
     
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