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Air idle control valve

Discussion in '1st Gen. Tacomas (1995-2004)' started by Kgfb, Nov 9, 2023.

  1. Nov 9, 2023 at 9:07 PM
    #1
    Kgfb

    #1
    Kgfb [OP] New Member

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    Need help! Coolant lines which goes where? Got 2 of them that connect to the IAC. Thanks for any help!!
     
    Kgfb, Nov 9, 2023
    #1
  2. Nov 10, 2023 at 10:21 AM
    #2
    Andy01DblCabTacoma

    #2
    Andy01DblCabTacoma Well-Known Member

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    F: Kings SPC, R: 5100s+J59s. Custom armor.
    upload_2023-11-10_10-20-6.png

    I highly suggest finding a digital copy of the FSM. It's easy to find "1st gen tacoma FSM" should do the trick.
     
    Andy01DblCabTacoma, Nov 10, 2023
    #2
    HondaGM likes this.
  3. Nov 10, 2023 at 10:57 AM
    #3
    Kgfb

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    Kgfb [OP] New Member

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    Thanks for the reply. I looked at the FSM still can’t find my query. Does it matter which hose goes where? I got one coming from the back of the head and one coming from the return of the heater. Thanks again.
     
    Kgfb, Nov 10, 2023
    #3
  4. Nov 10, 2023 at 12:35 PM
    #4
    O'Silver_Taco

    #4
    O'Silver_Taco Well-Known Member

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    I have a 98 2.4....

    there's a hose that comes off the steel line going to the heater.....heater bypass line...

    there's a little T' near the end that steel heater by-pass line..

    then a little rubber hose taps off that and goes up to the egr valve.....

    then another piece of hose comes out of that egr valve and shoots down to the IAC....

    then the hose out of the IAC goes into that 'Y' or T going into the back of the engine...

    MotorFlywheelclutch (2).jpg
     
    Last edited: Nov 10, 2023
    O'Silver_Taco, Nov 10, 2023
    #4
    THatt likes this.
  5. Nov 10, 2023 at 1:13 PM
    #5
    O'Silver_Taco

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    O'Silver_Taco Well-Known Member

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    This circuit is what feeds the egr and then the iac under the carb so each valve knows the engine temp....

    so a little hose comes off the hard line coming from the thermostat(heater bypass tube) ....

    and that circuit ends up merging into the 'Y' that holds the ect and gets the return from the heater core ......going into the back of the engine...

    1__66619.png

    This is what your ECT sits in....

    3RZ sensor.jpg
     
    Last edited: Nov 10, 2023
    O'Silver_Taco, Nov 10, 2023
    #5
    THatt likes this.
  6. Nov 10, 2023 at 1:25 PM
    #6
    O'Silver_Taco

    #6
    O'Silver_Taco Well-Known Member

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    Its hard to see that little inside line in pics....its hidden by the big fat heater hose..

    MotorFlywheelclutch.jpg
     
    O'Silver_Taco, Nov 10, 2023
    #6
    THatt likes this.
  7. Nov 10, 2023 at 1:35 PM
    #7
    O'Silver_Taco

    #7
    O'Silver_Taco Well-Known Member

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    ...fat one goes to heat core......small one goes up the egr valve...

    s-l1600.jpg
     
    O'Silver_Taco, Nov 10, 2023
    #7
  8. Nov 10, 2023 at 1:41 PM
    #8
    O'Silver_Taco

    #8
    O'Silver_Taco Well-Known Member

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    3rz to 2Rz bebuilt block and new heads
    So my egr valve has a water in and water out.....and a vac line,,,,

    IAC has water in/ water out......and a big fat air feed tube from upstream to the throttle body....

    dont get those mixed up.....holy crap.....


    the water never actually goes into the carb.....it just licks its bottom....

    So super careful with that gasket....IAC
    $38 HPS 5/16" ID blue high temp reinforced silicone heater hose 10 feet roll, Max Working Pressure 85 psi, Max Temperature Rating: 350F, Bend Radius: 1-1/4"
    Amazon.com: HPS 5/16" ID blue high temp reinforced silicone heater hose 10 feet roll, Max Working Pressure 85 psi, Max Temperature Rating: 350F, Bend Radius: 1-1/4" : Automotive

    51hCzN4scrL._SL1024_.jpg
     
    Last edited: Nov 10, 2023
    O'Silver_Taco, Nov 10, 2023
    #8
    THatt likes this.

Products Discussed in

HPS 5/16" ID blue high temp reinforced silicone heater hose 10 feet roll, Max Working Pressure 85 psi, Max Temperature Rating: 350F, Bend Radius: 1-1/4"
$37.54
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