Throttle Body - Explained

How does a throttle body work? What is a throttle body? A throttle body is a butterfly valve located between the air intake filter and the intake manifold. It regulates how much air can go into the engine, based on driver input through the gas pedal. As more air flows into the engine, it injects more fuel, thus allowing for more power. Throttle bodies today are mostly electronically controlled, where this throttle body is mechanical. It includes input for TPS and MAP sensors, as well as routing for the IAC valve, and a idle adjustment screw.
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[@pink221]

This video is very useful. I finally understand how my car's damaged throttle body was affecting the oxygen sensor and overall acceleration and why my rev meter was out of control. Many thanks!

[@thomasbrazil5460]

Carly McCalla GM throttle body remplacement 1990

[@TheSTRedline]

wow never seen anyone get that detailed on a throttle body before. good job

[@CarlosRivera-zq1dh]

Yes; exactly what I was thinking

[@hollyannsmith9130]

Lla

[@Kimwilkins502]

😮yesss he did an AMAZING JOB! Thank you!!

[@Auraesova]

**watching 'What Is Engine Braking?'** "...the throttle body is going to close..." **opens 'Throttle Body - Explained' in new tab** "...it's located between your air intake filter and piping and your intake manifold." **opens 'Intake Manifold - Explained' in new tab**

[@speedynelson5295]

something new

[@jelani2790]

thatz how ya learn my friend

[@txisbest2010]

This channel in a nutshell.

[@garyindiana2127]

literally been doing that for four days.....don't even have a car😭

[@subhransu7810]

it's a vicious circle my friend.

[@danielheathers1504]

Thanks as always, Jason. Spreading knowledge is one of the world's most satisfying careers. Would love to see a video about your thoughts on throttle body spacers.

[@9manny99]

I never would've thought I'd ever be watching Engineering Explained but this channel has helped me understand why something in my might go bad. Thanks!

[@pavel.murza.2839]

Hey thanks !You wore so detailed. I never seen someone explaining exactly everything how it works!

[@nottrueuser]

This was great! I would like to see more in detail explanations of parts like that! Thank you

[@anastasijajordanova6684]

Finally someone to explain this thoroughly and in detail. Thank you!

[@tpv59]

You are the BEST, You ARE the Man. Thank you. You are a Legend!

[@staninjapan07]

Good explanation, thanks. I was looking for videos on which product (throttle body cleaner vs carb cleaner) to use to clean the throttle assembly/valve on my scooter safely, and ended up getting a very useful tutorial.

[@casaiphi7776]

I have throttle body service this morning and I felt significant power when pressing the pedal. Thanks explaining this part.

[@YusufSheth]

Great video. One suggestion: on smaller, more involved parts like this, use a diagram or a still shot of it and draw on it in post production to show what you're referring to as you speak. It's not that much of an issue because all the air channels and things like that are pretty distinct here, but some on-screen red lines and circles would do a better job of pointing to specific parts than would your fingers.

[@rj.8.8.u]

have no clue wtf you're talking about.. but you're AWESOME

[@kathrynsmith2684]

Thank you so much, you explained it very well. My 2014 Chrysler 200 just had to have this part replaced, as I had never heard of it before, I was glad that I watched your video. Bloody practically new car and had to have a major fix like that after only 37,000 kmp.. Oh well.

[@leondrearmendariz5617]

Thank you for explaining this so well, it was extremely helpful. Mine just went out and I had no clue what it was 😂

[@chillguy2281]

Awesome video! I'd love more like this, explaining the more nuanced parts of a car in detail with a physical specimen to look at.

[@StrengthUltimate]

Could you make a video regarding ITB (Individual Throttle Body) and what the benefits are compared to single throttle body

[@sonicthehedgehog2610]

anyone went- VRROOOM!!!! when he activated the throttle?

[@aaroncmx]

+Sonic the Hedgehog Stop it Sonic you don't even need a car.

[@MicBergsma]

No english closed caption? Darn...

[@ferniel8458]

Very informative breakdown.👍

[@mitchingram550]

I'm glad you took time outta your day from being yellowstones lawyer to explain this too me thanks jamie

[@polloloci21]

Thanks man. Was researching a throttle body coolant delete and this helped.

[@lazygamer923]

Damm he's a good engineer he explain it so well.

[@michealbithi1290]

Can you pls do advantages and disadvantages of throttle body, carburettor and injection system?

[@colbyw917]

Great video man. I gotta 88 model chevy small block 350 tbi. You just gave me a much greater insight on the throttle body on it.

[@DawkDaze]

My comment is, that you are truly a gift to human kind.

[@kenopsia9013]

oh wow i was wondering how the engine doesn’t stall when there is no airflow from the trottole body i had no idea there was a bypass hole that’s cool, good tutorial

[@davep5161]

VERY helpful... Clear, concise, mystery dispelling video.

[@HK0HunterKiller]

Thank you for this video. It dissipated several doubts I had about how the throttle works.

[@lawhill1986]

Thank you for making videos like this. You are the guy I come to as soon as I need info on cars!

[@skywalker8909]

Hello, just wanted to say thank you so much for sharing so much knowledge, may Allah bless you & give you great success in life & in health.

[@stonebrooks1288]

Thanks for the video, mine was replaced yesterday at the dealership and I was just curious as to what it was.

[@jpatino8778]

nice job .. you leave me with almost no question.. this is the kind of stuff we should learn in school.. thank you

[@DrFarisArab]

i have noticed throttle delay in my new car, specially visible in idling speed, engine is very slow to react when i press acceleration paddle, i must press continuously to rive the engine, is this wrong or its manufacturing feature?

[@dakel7]

Tighten your cable

[@ziauddin7948]

excellent explanation of mechanism of throttle body

[@albert5828]

This was a great, concise explanation of a throttle body. Thanks so much, not a huge car guy and I'm supposed to design a throttle valve and do CFD testing on the air flow for my senior design project so this was a good start on the anatomy of it.

[@contrepois]

omg. now I understand. :D I' want to order a CAI brand cold air intake and while I was searching forums and watching youtube videos, the term "ported throttle body" came up. I'm fairly new to the car mod scene so this video is reaaaaally helpful. Thanks!

[@mdmohasinahmed763]

Best video for Engineering students.

[@mintmochi0496]

Intake manifold next vid would be awesome

[@davidvarela8739]

2015!!! how come I haven't found this channel before?

[@Peter-zc5xc]

I like your explanatins, learn alot as a newbie. That sad, KZbin is a global thing and alot of the viewers dosnt have English as first language, like me, so it would be highly preciated if you could talk somewhat slower in the videos. THx.

[@alexromero5459]

Great video! Everything I needed to know about this product, definitely switching to this throttle body.

[@stuarthodge3187]

Very interesting. Thank you very much for posting!

[@thomastirolflorida5363]

Simple, Clear and well done.VERY well done !

[@WPXTacoMan477]

Can you make a video for properly setting idle control and using the bis screw?

[@Catherozero07]

You should do a video on Throttle Body Spacers! :)

[@user-ro6ou5vb8y]

Thanks God for sharing your understanding about this matter.

[@derekrose3328]

Thank you! Not car savvy and your explanation helped me understand! I appreciate it!

[@brandonnolff1844]

At idle it gets more fuel not more air I thought. Please correct me if if I was wrong. BTW I watch all of your videos and I absolutely love understanding how things work! Good work!

[@brandonnolff1844]

I also have request. I am in the propane and natural gas fuel system business. Can you make a video on how a propane fuel system works? Natural gas system? If you need resources I have all sorts!

[@jabumahlalela3006]

Wow, this is a very useful video. It really educates me about throttle body. So what makes my Opel Astra H have a high rev every time when I am starting the engine?

[@clintthambi06]

So thats how it is... great information !!! thank you so much

[@Eddie89]

I'd love to see an explanation of Throttle Body Spacers and if they even truly do anything or not. Too much controversy.

[@guitarpro594]

Do your research and you would know. Spacers are all about adding Volumetric efficiency, (more air traveling through your plenum). This increases MPG, HP in higher RMP range, and keeps the engine cooler providing more cool air for better, more consistent performance output. It's really simple and the information is more than abundant, friend.

[@4door_papi]

Fake Name that sounds like a personal problem as that was a cheap one lmao

[@TheOnlyRaceEngineer]

fantastic illustration

[@SkarnDeBrax]

Great, it's nice to see the part and understand all is component. Thanks.

[@itrstt66]

could you make a video explainning the formula used to calculate the right diameter of a carburetor's ventury for a given engine? like knowing the displacment of an engine what would it be the carburetor for it?

[@adrianmendez832]

Hey man a long time ago I wanted to say thank you for all your videos, I'm a car enthusiast that not only like when cars "look nice", I also like too know how to improve the way they work. I'm thinking about starting my engineering studies and I want to know in what area are you specialized? Is it automotive engineering? Or mechanical engineering?. I hope hearing from you soon. Thank you again for what you do for all those car enthusiasts and engineering fans.

[@michaelkavora4226]

Thanks. Very informative video. Please explain how a PK PJ 3.0 throttle body works. It only has a kind of a vaccum lines attached. Is it electrical?

[@salimsachwani3613]

The video is very helpful. I have a question, is there should be a small gap between the throttle plate/butterfly and the throttle wall?

[@mcspikesky]

'Throttle body heater delete' is a very common modification for the M42b18 that's in my BMW E30. Every horose helps and here in the UK it isn't going to freeze. Hopefully..

[@Vatican22]

You should consider making a video on Individual Throttle bodies, their applications, their benefits, their drawbacks, etc... I don't know much about them and I'm having a hard time finding information about them. Seems a little unorthodox to run an engine without an air filter... But like I said, I don't know much about the subject.

[@robertvanocker2695]

you did very good, but you should explain a little more about the anatomy of the tb. like the names and what happens if you adjust that this way and that this way so on an so forth.

[@Satheesh-Catholic]

Excellent job. You have almost made me an expert. 😊 Thank you 🙏🏼

[@hiwaabdulhaq138]

Thanks for your information, I have a question please : What is the benefit of the vacuum line ?

[@MuzzaMiki]

That was very interesting thankyou!! Please do a 20 - 40 test to see what increase you get

[@custommotor]

none if any

[@Cdswjp]

clear, detailed & to the point. excellent

[@christianmontellano2385]

So the TP sensor is the one that send info to the PCM to command the amount of fuel that should be injected, or is the MAF sensor the one that determines how much fuel should be injected.

[@dannielledickinson672]

This is great finally found out the reason why my car just slowed down while on the highway

[@rajupandey1946]

Gave a good explanation for sure though great work dude

[@e.p.m5095]

What do you think about throttle budy spacer?

[@garydrago]

Excellent explanation. Really helped me with my project.

[@brennendw]

Hi just a quick question, I have a BMW 330D and looking to increase the HP available, looking on-line you can get upgrade chips. Do these diesel upgrade chips work? Are they safe? Are they worth it? Thanks for the videos man! Keep up the good work, best KZbin Vids going!

[@alhamedi66]

thank you for the video , how to calculated the right size of individual throttle bodies or single .

[@zero-fg1012]

Thank you for this..love your vids..mostly watched to see if I could delete some passages. As I deleted 2 sensors

[@melon2soda]

do you make it always run at full intake?

[@Wez633]

ahhh Throttle Body I drew one of those in Drafting class a while back.

[@NoPsychoBabble]

Professionally presented! Well done!

[@andreimanolache3250]

Considering this video,another question poped out of my mind and that is when the engine starts,you don t press the accelaration pedal. Therefore,how does the engine suck air to keep running if the throttle body is closed?

[@Rtorresb16]

Hey do you think you could explain the vq37vhr engine on a video soon? I've tried to understand how the whole camless vvel system works but I just always find mixed info on that topic. If you can I would appreciate it. Great videos. Very informative and never a waste of my time unlike much of KZbin out there. Keep it up.

[@custommotor]

From what I can find it's not really camless it just works slightly different. It uses rocker arms to hit the valve tappets instead and the way it changes lift and duration is by changes the pivot point in the top control camshaft.

[@gregfunk9559]

I have heard that too large a throttle body can in some cases hinder performance due to slowing down air speed. Any thoughts on how to know when its time to go larger?

[@A.A.HadiWhite]

what should we put into consideration when we upgrade a throttle body?

[@zeron3699]

The even better thing to do is to remove the whole throttle body and clean the area behind the valve more thoroughly. Also allows you to clean the small passages easier.

[@jasoncrocco2744]

Could you also do a video on whether or not throttle body spacers work and if they're worth the money?

[@TheRomichou]

Cool Video! Next one on Injections :) ?

[@rogerklekacz9599]

Great explanation and very thorough. Can you explain what a throttle body spacer is and how it works ?? I have an F-150 w/6.0L engine. My son says I should put one on and it will help power and fuel mileage. Thoughts ??

[@thegoldenman54]

Explain the intake charge you were talking about when explaining the coolant hoses passing underneath to heat it up?

[@robertdiehl9003]

Excellent and detailed video.

[@paulrawlins3595]

Absolutely love your channel! You explain so much for me! 💯💯👌🏽

[@keitharoo1962]

Wow, I just learned a LOT! Thanks for the awesome video!

[@thurbine2411]

Why does the throttle decrease flow instead of decreasing pressure while increasing the velocity and maintaining constant flow?

[@BAK87]

Really good presentation!

[@flameofschy3382]

in some cars the iacv fails so they install a bypass with an idle up actuator working with the compressor and that works to prevent engine stall when ac is on...my question is, how is it that this bypass works when the iacv has already failed to begin with? is it because of the screw adjuster still allowing air for idle somehow?

[@rdzmarin5011]

Thank you for sharing your knowledge.

[@HMAnetwork]

I love this channel

[@milsgarage]

we love ur channel!

[@gailcaplan7015]

What is the difference between a throttle body assemble and a throttle body sensor on Honda 2007 CRV

[@malachiwilliams2364]

Hello Mr. Jason. I am 13 and I am very enthusiastic about cars and engineering itself. Thnx for all the knowledge you have given me. Just one question, what college did you go to and do you recommend it?

[@EngineeringExplained]

Malachi Williams I went to NC State. It was certainly a challenging and rewarding curriculum, though there are lots of good ME schools. My recommendation would be to go to something accredited and local to save cost.

[@hgmailcom]

NCSU is a really good school and pretty hard to get into, almost all of my friends got deferred. That should tell you about how smart Jason is. Just make sure you get the best grades possible and take a lot of science and math AP classes.

[@MonsterNewfie]

Could you explain independent throttle bodies? What is the benefit, and what do you sacrifice?

[@Niiopii]

Can a loose gas tank cap cause issues for the throttle body valve, especially in cold weather?

[@outofspace-cs8wp]

Can u please make a video explaining individual throttle bodies vs single throttle body & what's the benefits between ITBs vs just CAI

[@outofspace-cs8wp]

+outofspace2014 And what would u choose between these two for your integra & why?

[@godfather1118]

+outofspace2014 ITB tend to have better engine responses and better air flow. They are tend to not be friendly to every day cars, (cars that are not mostly performance oriented) and to get the most out of them they will have to be tuned with the car's engine. cold air intakes are simple to install and are more car friendly, when you put them on, they just work for the most part.ITBs allow all of the cylinders to have there own source of air. Just like exhaust pulses engines have intake pulses. On a single throttle body setup, since all of the cylinders are not firing at the same time and they share the same source the air is distributed between them, the intake pulses interfere with each other causing some cylinders to get less air than others reducing power. (the loss is very minimal, but if you are racing than that is horsepower you will not have, also the higher the RPM the more this is an issue) The reason why ITBs tend to have a faster engine response is because of two things, the plenum intake runner seen on normal single throttle body setups that brings the air to the intake manifold, and pressure waves. The plenum runner that are on normal setups have to depressurize before the outside air can go in, delaying the air from reaching the cylinders. Pressure waves are created when the butterfly valve or valves close. When air is rushing to get into the engine and the valve closes the air doesn't stop moving instantly. The air smacks the valve and bounces of it in the opposite direction, creating a vacuum in between it and the face of the valve. This vacuum pulls the air back toward the valve with added velocity causing it to enter the valve when it open at a faster rate than without the pressure wave. This only occurs when it hits the valve, so the valve will have to be mostly closed for these pressure waves to occur.This only works when an intake valves opens as the pressure waves reverts (pulls back the air). meaning that this only works at certain RPMs. With extensive tuning you can increase the amount of times it happens.The bad thing about them is that they do not play well with stock ECUs and measurements in stock cars. Without a plenum or filters they are exposed and can allow debris and unwanted materials to enter your engine. You can add a plenum but the associated benefit of not having one is hurt for the most part. You can supercharge with ITBs with the plenum on.With CAIs the benefit is that they tend to be farther away from the engine and closer to the outside air, so they get a colder charger of air. Compared to the ITB they are more friendly to cars and do not rely much on tuning.ITBs are for people who are looking to draw out every horse they can, like racing. Formula One and Dragsters use ITBs. CAI are for simpler builds and for people who want to add power to a car that can be a daily driver.

[@outofspace-cs8wp]

+godfather1118 Thanks for the answer dude :) Now i get it!!

[@Aarib-Vlogs]

Butterfly on idle should be 100% close ?? Means no need to adjust butterfly adjustment screw ??

[@pqr2726]

Mind blown! Like a walking auto Wikipedia.