Throttle Body Question?

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by Nicky Wayne, Apr 6, 2020.

  1. Nicky Wayne

    Nicky Wayne New Member

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    Why does the throttle body have two hoses with pink fluid? We are doing the head gasket on my 3rd gen when he pulled the tubes pink fluid came out.
     

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  2. Raytheeagle

    Raytheeagle Senior Member

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    Welcome to Prius chat(y).

    They run coolant to the throttle body so ensure it functions in the winter and doesn't freeze up;).

    Now if it came out of the PCV valve hose, that's not good:eek:.

    Good luck with your head gasket job(y).
     
  3. Mendel Leisk

    Mendel Leisk Senior Member

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    You didn't really need to disconnect those. More info (and attachments). It's EGR cleaning centric, but might still be useful:

    The simplest way to see where you're at, is to check the degree of carbon build up in the EGR pipe, a stainless steel connecting pipe between the EGR valve and intake manifold. Watch @NutzAboutBolts video #16 here:

    Nutz About Bolts Prius Maintenance Videos | PriusChat

    Two or three other videos linked there too, for the full cleaning of the intake manifold, full EGR clean, and Oil Catch Can install.

    Good thread:

    EGR & Intake Manifold Clean Results | PriusChat

    Another:

    Oil Catch Can, Eliminate that knock! | PriusChat

    Some tools worth having:

    E8 Torx socket (mandatory)
    E6 Torx socket (optional, but good to have, to remove the throttle body studs from intake manifold)
    3/8" ratchet wrench, regular and long handle, flex head, you can never have enough (or 1/2 plus reducer)
    1/4" ratchet wrench, or 3/8" to 1/4" reducer
    Ratchet extensions: you can never have enough
    Long needle nose piers, straight and bent tip
    Ratcheting 12mm box wrench (optional, but makes disconnection of the EGR cooler from exhaust easier)
    Torque wrench (3/8" and 1/4" both good to have)
    Floor jack and safety stands (or ramps): basically some method to raise front, if you need to take underpanel off, which you may need to, both for access and to recover dropped items.

    Comment regarding clamping of coolant hose, mentioned and or shown in videos:

    1. When removing the intake manifold for cleaning, you do need to lift the throttle body off the intake manifold. Still, the coolant hoses connected to the throttle body have ample slack, enough that you can leave them connected, and just tie the throttle body to something adjacent, say the inverter wiring harness.

    2. When removing the EGR cooler, removing coolant hoses is necessary, but if you drain 2 liters/quarts from the radiator drain spigot prior (into a clean container), the coolant level in the system will be dropped below the EGR componennts, and you won't spill anything. Just be sure to not tip the cooler when lifting it off (and catch the rear gasket): there are a few tablespoons of coolant trapped at the lower back corner.

    Pour that into your previous drained coolant, and when done pour it back into the reservoir. If you've got the coolant bleed bolt (2010, 2011 model years), leave it open while pouring the coolant back in, till coolant starts coming out. For later model years, leave the topmost coolant hose on EGR disconnected till coolant starts coming out. Also, might help to burp the main radiator hose as you pour the coolant back in.
     
  4. Mendel Leisk

    Mendel Leisk Senior Member

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