How the Throttle Position Sensor (TPS) and Idle Air Control Valve (IAC) Work
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- Опубликовано: 7 окт 2016
- This Video explains how the Throttle Position Sensor also known as TPS and the Idle Air Control Valve ( IAC ) Work.
On the previous 2 Videos I explained how the Fuel is delivered to the Fuel Injectors by the Fuel Pump, I also explained the parts involved to make that happen.
This video is a continuation of the previous 2 to show how the TPS and IAC Valve affect how much Fuel Is delivered by the Fuel Injectors depending on the Engine Speed, from Idle to Full Throttle.
It is also mentioned how different conditions affect the Idle of a vehicle like placing the Automatic Transmission in Gear or turning the AC on.
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#IAC #idleaircontrolvalve #idle #valve #howstuffinmycarworks #TPS #TPSSensor 
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I had a GT-40 Intake installed on my 1992 Mustang 5.0
Just about immediately I had a high Idle situation that I could not back down. Great ! All that I spent for nothing !
I was about to give up and have it all put back on the car. I watched this video and got a VERY clear understand of how these things work. One last time I tried to fix it. I cleaned the IAIC valve with T.B. cleaner like you said ! NO GOOD ! Still high Idle. Then I noticed that the shop installed the IACV upside down. I reversed it. PROBLEM SOLVED !
THANK YOU ! YOU SAVED ME !
Excellent. Answered my questions. We were getting irregular idle could not find an IAC on this KIA. You explained why. It is built into the TB motor and TPS (which Kia calls the ETC--Electronic Throttle Controller). Opening that VW TPS cover showed it all. KIA uses the same system as VW. We replaced the TPS and it solved the problem.
Makes SO much sense now! THANK YOU! Big difference between repairs for old and new too. Our '03 S10 IAC fix $30. Our 19" Mercedes - fix $760. OUCH! HATE HAVING TO TAKE IT TO THE DEALER!!!!!!!!!!!!!!!!!!!!
Thank you Sir, i’m not a mechanic, and this video of yours given me the idea to understand the function of this parts w/c is a puzzle for me. Thanks again
this is a good technical explanation of how ISC and TPS play together...good job.
I subscribed to your channel. Because the way you explain in a way that is easy for people who aren't mechanics. This way I can direct people to your channel, because its easier for them to watch a video, than me trying to explain to them over the phone. Thanks
Thanks for the education on the relationship between those parts.
Excellent video. Straight forward information which was helpful.
Excellent explanations - keep up the good work!
So the IAC valve replaced the idle jet and adjustment screw in old school mechanical cars is how I read your video.
Thank you! Btw.
Excellent presentation. You are very intelligent. Thank you
excellent explanation about IAC after i understand why use iac... Thanks please keep it up
A good explanation
That was very well explained - keep providing more of such info videos thank you
Great video, you cleared up how the system works for me. Thank You.
Excellent explanation for a very complicated topic very impressive about your fuel injection knowledge truly helpful and informative
Thanks good job on your video accident information and describing the the throttle body and the sensors
Fantastic explanation!
De los mas grandes tu eres uno.
Thank you , excellent explanation.
Nicely explained. Thank you so much.
Excellent lab.
Thank you, this was very helpful.
Very marvelous presentation it was quite enlightner..
man your awesome, everybody else I watched sucked, they only showed old ass cars but you covered both.
Thanks for the video
Great explanation 👌
Cheers Bro. awesome explaining everything. My interest lay in your last intake as I have a 2007 GM car with that sort of throttle body. Thanks for showing us inside it. Ihave heard those little plastic gears can strip out and cause (obvious) runnig and ideling isues.
Excellent presentation! I’m going to check out your other videos. New subscriber here. 👍🏽👍🏽👍🏽
Great video thank you
Great lesson. Thanks
Great video
A very good video.. Thank you for your efforts..
Good one man ! thanks
😚Thanks so much!!!! What an education. How do u want me to pay you for this GREAT LESSON? 👏👏👏👏👏
Thank you foe this video. It helped me understand the system and I fixed my own land cruiser because of it.
Why is it at least on a Nissan when you move the flap it just totally screw up its communication and idles to high to take a relearn why is it you can't fully clean the thing! Super awesome video thanks for yur efforts!
Jestem oświecony. Thanks.
thanks so much!!
Very thanks
Bravo !!!!
Thanks master
Thank you for the video, if there is carbon inside the area where the Idle Control Valve screws in, what is the best solution to spray in there to clean? I've heard not to use Carb cleaner?
It makes me curious of how carbon builds up on the small tip of that IAC Valve...
Thank you for your helpful Vid.! - 👍
from breather hose when pcv is partially closed
Thanks for this video. One question. Is there just 1 iac and tps per vehicle? Or should there be one on each cylinder/throttle body?
You are wonderful
Excellent video. I have a 2002 Toyota Camry 3.0 liter engine (1MZ-FE) with a throttle body that is not controlled by a cable. Occasionally it stalls at idle when I am driving. When I turn the engine off for a little while (20 minutes or so) then turn it back on the problem goes away. I cleaned the throttle body and the mass air flow sensor but still have the problem. There is no check engine light and no codes. Any suggestions you can offer me to check? I bought this car when it was new and still love it.
@HOWSTUFFINMYCARWORKS I have a 95 Hardbody with Ka24e. Would you be able to explain how to reset the Throttle Stop screw. The one that is never supposed to be touched and pre set by factory? A blown engine I bought and rebuild had issues with the pedal hanging up. And the problem was throttle stop screw being completely back out. My truck has been under powered, bad gas. I have made adjustments recently and when its cold its running beautifully and feels right, but after normal temp up, take off and gear shifting has a hesitant effect. Like a bog then fuel kicks in and takes off. My fuel pressure is staying at 40 psi which is supposed to drop to like 33 or 34 after normal temps I believe. I would like to know also on IACV idle screw, say its turned to the right completely off, what should be the default number of turns when opening that idle screw up.
Thanks for video!
i keep going threw iac"s on my 2003 ford escape 3.0l duratek car wont idle without throttle,any reason why?
Good work6%10
Your 👍 awesome
I have 02 Nissan Frontier 2.4L with 210k miles, project truck. I' have a pesky P0302 that will not go away. I almost replaced everything except PTS and IAC valve. If idling at 700rpm and put it on drive, my rpm drop to below 500. Is my IAC bad? The coil reads 11 ohms, I disconnected it, run engine, reconnected and rpm changes. Any suggestion?
Excellent descriptions. Have a constantly changing hot idle speed in my 88 S10. Occasionally normal, but usually high or takes a long time coming down.
I think tomorrow is the day to replace the IAC valve. It might even be OEM of the 1988 era.
ok
Do you happen to know the signals it sends? Is it 12v and then it drops 1 volt all the way down to like 5v? Is it variable like that to change how open the valve is?
Also when I first start my car it idles high like it should (1200 to 1500) and immediately drops like it should slowly but as it's doing that I get some surging and shaking (rough idle)....do you think that could be a faulty IAC solenoid? Maybe I should check the resistance or check the incoming voltage from the ECU or possibly even check to make sure the throttle position sensor is sending the right info...
I just replaced the icv on my 87 s10 blazer. I am curious to know how the plunger on this valve moves. Is there a motor inside the device that spins the plunger to different positions from open at start up to completely closed under acceleration? I noticed that you can not depress the plunger of the valve if you are holding it in your hand. I am familiar with an egr valve that opens and closes under the effect of a magnetic solenoid and at first I thought that was the mechanism behind the icd, but apparently it is more sophisticated.
a stepper motor is used
Hi
Pls u didn't explain the wires on the IAC. Is it 12v ?
Can TPS cause the car to run rich and throw po172 and po175 oxygen sensors running rich codes??
But on the Toyota the iac twists to open, rather than depresses.
I just cleaned mine out on my old Lexus rx300, and had a question: As I cleaned it I twisted it obviously out of the position it was in when I removed it. Cause it twists a full 360 degrees, and you have to turn it to clean off the carbon build up. There’s no spring or anything to set it at a specific location, so when I turn it, it just stays where I left it last. So will the ecu automatically turn it to re-set it to where it needs to be? I know that’s the whole point of the iac, I’m just wondering if it is supposed to be at any specific setting when I reinstalled it?
u have to mark the position of the motor before removing.
can u plz tell me what my problem could be. 2005 nissan frontier, in gear, sitting at stop sign, at idle, foot on brake. The engine rpm vlimb very fast to almost redline, and rear tires broke loose and started chirping, I put in park and turned off key, I restarted it and put it in gear and drove home, I pulled the throttle body and it was very dirty I clead the butterfly and insde the throttle body. my truck is drive by wire, I dont think it was the acclerator pedal, because I was at idle. what do you think caused my problem. I checked codes, and only got an evaporative emmisions code.
at first I was thinking that it must be something in that drive by wire accelerator pedal, but because I was sitting at idle, in gear, now im wondering if something went haywire with the idle control , as before I was thinking abt it as an accellerator malfunction, rather than an idle malfunction. it scared me because this never has happened before. I am afraid to let my wife drive the truck now. it wasnt like a high idle, it was like VERY HIGH, like the engine would have blown if I didnt shut it off.
Need help!...I replaced my IACV due to surging idle. After replacement the engine cranked up to 4000 rpms....I had to tap on the brake to get it back down...then I test drove it and the car wouldn't DEcelerate when I took my foot off the gas...had to ride the brake home......I switched back to the old one and everything went back to normal.....what could be going on?
Buy OEM, after market sometimes are defective due to poor quality control in the factory.
where does the AC system sends signal to the iacv to make changes to the idle when opening the AC?
to the ecu. ecu needs current engine rpm, engine coolant temperature, map/maf data, tps data, ac signal to control voltage to iacv
My Expedition only dies in reverse or drive when it reaches normal temperature after I have driven long or short drive.After the engine cool off It will start and drive with no problem even on any stops.Only if I park and try to start it over again its been like that for months.So I never bother to fix the problem I could still go from Point A to B.
check for a bad thermo bypass valve
Hi can iac valve cause a vehicle not to rev pass 3000rpm?
no. but a bad tps can. your car is likely in limp mode.
dear sir I saw your clip I like it but one thing u didt discribe about Toyota corolla idle and fast idle How it work because it have two pipe line in this sencer then u should discribe it plz
it seems that the new system doesn't have a tps nor an iacv.great presentation.it seems it is going back to the butterfly movement not by cable but by a motor digitally controlled.
please correct me if i am mistaken
.
And you should learn how to spell first
@@familyfirst7027 This isn't English 101. We is talkin' car stuff. 😁
This is so easy to understand now. Why the hell we can't use this same method to go to Mars and beyond.. Using just Gasoline would be cheaper and we could store and refuel big gasoline tanks in geosynchronous orbit for our rockets to Mars and even Neptune. Maybe cost $100 Million or less.
Great video though.
I'm going to buy a modern vehicle by the way it looks then strip it up all the electronic crap and put a carbureted motor with a manual transmission and old style speedometer cable or just a guess my speed.....
Who's with me ?
Are you free sir