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[DIY] : How to Clean Throttle Body 2.4L
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Thread: How to Clean Throttle Body 2.4L

  1. #1
    Riding Lawn Mower
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    How to Clean Throttle Body 2.4L

    DIY - Cleaning Throttle Body

    On Kia Optima 2.4 2011-2013

    Difficulty Level: Easy
    Time Required : 35 minutes

    What is Throttle body?
    Engine is where Oxygen (air coming in from air intake) + Fuel (Gasoline) + Fire ( Spark plugs)
    Come together to create combustion >>> moves the pistons in your engine >>> which moves the car forward.
    Depend on the speed of the vehicle, your car need varying amount of Air/Fuel. When you hit the Gas pedal, the throttle opens up to let more air into the engine. Throttle body is the mechanical part which regulate amount of air coming in to the engine.

    Why Do I need to clean it?

    Gasoline does not burn 100% clean (think about cheap candles.. and the black stuff at the end of the candle wixs) , eventually carbon will build up around throttle body plate, If excessive amount of carbon built up around the throttle body, the engine will not get enough air into the engine. With high mileage cars, the idle RPM is high because the car ECU is trying to pull more air in(compensating). or when you are at the stop sign idling, your car will die. (because Not enough air is coming in)

    How often do I need to clean it?

    My Kia dealership said I should clean it every 50,000 miles. My car was 56000 when I cleaned it, Mine was not that dirty, but there were definitely carbon build up.





    CAUTION CAUTION CAUTION CAUTION CAUTION CAUTION
    Perform this job when your car is completely cool to touch
    The Fat Hose around the throttle body is very hot and it can burn you.
    CAUTION CAUTION CAUTION CAUTION CAUTION CAUTION
    Be gentle with moving throttle body plate.
    CAUTION CAUTION CAUTION CAUTION CAUTION CAUTION


    Let's get it started.

    Tools required for the job
    • Toothbrush (some people use metal tooth brush for this job.. I just use plastic tooth brush
    • Microfiber towel
    • Nose Plyler
    • Flat screw driver and Philips screw driver
    • Throttle body cleaner ( I used CRC branded one $7 at Pepboys, I cleaned 5-6 cars with one can.)






    Step 1. Remove Air filter Cover
    a.Unclip 4 clips which connects the top and bottom part of the air filter cover.
    there are two on front and two more on back.

    b. Unscrew and loosen the hose holding metal ring. The screw does not completely removed, just to a point the ring goes around freely around the rubber hose

    c. detach top air filter cover from the Big hose.










    Step 2. Remove front air intake

    It’s only held by two plastic clips on the front. I used the small flat head screw to wedge it between Screw looking like piece and the plastic bottom Part.









    STEP 3 REMOVE the air hose from the throttle body.

    Remove 2 smaller hoses from the main big pipe.
    1. Use pliers to move the metal clips towards the middle part of the smaller hose.
    2. Gently wiggle 2 small hoses off of main hose.
    Untight the screw which holds the air intake hose from the throttle body.

    Wiggle to get the hose detach from the thottle body.




    Step 4. Clean
    (sorry no pictures... hard to get the shot when i was working by my self)
    Using the throttle body cleaner and toothbrush and towel, clean the carbon build up on the round plate and the pipe.
    you would need to hold the plate open. I just used my fingers.
    If you drop screw driver in the hole... you will be very very sorry.
    DO NOT USE excessive force. and damage the throttle body.

    Most of carbon residue will be cleaned by chemical it self.

    WATCH THIS CLIP.
    http://www.youtube.com/watch?v=41yFX...p6ajh1XU4_gAXR



    Step 5. Reassemble

    Step 6. start the car
    The Throttle body cleaner dry off pretty easily, but the very first start might be little ruff because it might might have not all dryed off.
    DO NOT Worry. After 1-2 ruff start, the car will start like a normal car.
    IF the car does not start, let it dry off over night and try next day.


    Enjoy!

    I hope this guide is helpful!
    Last edited by tkkidd; 11-21-2013 at 01:56 AM. Reason: more info

  2. The Following User Says Kudos to tkkidd For This Useful Post:


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  4. #2
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    Man..... Even though I don't have a 2.4, this is a great write up. Probably one of the most in-depth I have seen. Tons of pics and explains everything needed and what you need to do.

  5. #3
    OptimaForums Veteran Triple-K.Hybrid's Avatar
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    every info i need is here. good job having the pics bro

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  7. #4
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    man... y isn't this DIY more popular?? this is awesome! do more! do more!
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  8. #5
    10/2012 + 11/2013 ROTM unreligion's Avatar
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    completely missed this till now i was just thinking about doing it at about 65k miles




  9. #6
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    yup, seriously important DIY. He even explained what the part does and why it's important to clean!
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    LED cup holder
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  10. #7
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    Isn't there a MAF(Mass Air Flow) sensor behind the throttle body?? If so Throttle Body cleaner could damage that sensor.

  11. #8
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    Quote Originally Posted by Zachattack2013 View Post
    Isn't there a MAF(Mass Air Flow) sensor behind the throttle body?? If so Throttle Body cleaner could damage that sensor.
    No maf. there is a special cleaner just for MAF's though.
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  12. #9
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    MAF sensor is located before the Throttle body... I could not find it on this KIA, but for my toyota Camry, I used to clean that every 6000 miles.

    MAF Sensor detects how much air is flowing into the car. (before throttle body make adjustment of how much air it needs it. If this car has MAF Sensor, it should be located before the throttle body.

  13. #10
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    I dropped my screwdriver in the hole, now my motor makes funny noise. What's next?

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