This is how to produce an instructional video. No "Whatsup guys?" And 5 minutes of yacking before gating into the important info. Concise and to the point!

You guys are hilarious. I like that thing you did with the noises and quick shots. I never thought someone could move their mouth like that.

Thank you! You helped me to figure if pintle was sticking.So off and on problem, but causing concern! THANKS!

Would also like to say that you should make sure to check all of your lines for vacuum leaks, especially plastic connectors, like on the PCV, which can tend to crack. Vacuum leak/s will cause rough idling and would be best to rule that out before you go looking at the IAC. Another thing to make sure of first, is that your intake air temperature sensor is operating correctly, as well as your mass air flow sensor. It should also go without saying that you should use a scan tool on your vehicle to see what trouble codes your vehicle is throwing. That's usually a decent indication of what is wrong with the system as a whole and where to start, but not always the case if it's something wrong with the ECU, for example. If you've done all that and ruled it out as a possibility, then we can move on to the IAC. A better test for IAC's, would be to start the engine, and pay attention to how your motor runs and what rpm it falls to after a couple minutes, and then shut it off. Now, figure out where your valve is (usually on or near the throttle body of the intake manifold in most cases; sometimes a hose will lead from the throttle body or intake air tube to a remote valve somewhere, so make sure where yours is) and unplug the wiring harness connection, and then start the vehicle again. If your IAC Valve _has_ been functioning properly, you should know right away because you should immediately notice a change in how the motor runs with it unplugged. If it _hasn't_ been functioning properly, you will most likely see no change in the way the motor runs because the compensations that the ECU has made are still in effect. At this point, we still don't know for certain if it's your IAC though, so don't immediately condemn it. At that point it would be best to get a multimeter or test light and test the electrical pins on the control valve. You would need to look up what the correct voltages are for your vehicle from your owners manual or by looking it up online, and it would be good to test the pins on the wiring harness as well to make sure that the wiring is not faulty either or getting bad signals from the ECU. The reason we want to do all of this troubleshooting, is to rule out or confirm the IAC or the wiring being the problem, and if it is not, then we can start to troubleshoot elsewhere, like your engine timing. Perform troubleshooting tests whenever possible, otherwise we're just blindly ordering parts and pissing into the wind. If you're here reading, I hope you figure out whatever the issue is, and have a nice day :)

Thanks for your valuable contribution. God bless you

Thanks Matt,I just subscribed to your channel,my 1997 jeep had the same symptoms, after spending about $400 bucks,on a new fuel pump,o2 sensors,I was even going to take the catalytic converter off and drill through it and weld back on,turned out to be the dam I.A.C valve ..smh.Anyway thanks for the video.Jeep runs great now

i like your explanations - far too many fail to explain the reasoning behind their actions. you do a great job with this. thanks!

On my 94 Mitsubishi Montero it had what appears the same IAC. My engine was not holding idle, but stalling out. I was able to take the IAC apart (3 small screws), clean it, and put back together......and it works now. Also cleaned the throttle body area where it fits into as it had some corrosion/grime there.

Thanks for your your help i seen the video and its quite educational,

Good job Matt on this video. Thanks for taking the time to post this.

Thanks for the video. What kind of difference in pintle distance should you see in a properly functioning valve?

Yes on the white smoke coming out of the tailpipe, the last couple weeks. I'll have to check the milky stuff, theres no cap on radiator to look inside. i had some work done on the car a few mths ago and at the time the car would just not start for a couple days then fire right up and be fine. The mechanic kept the car 2 days and it started every time! Nor would the check engine light come on. He advised me to have it towed in when it wouldn't start but it has ever since. while there he did a "new car" inspection to break down what all i need. A tune up, valve gasket covers, tie rod...to the tune of $1500 for everything. The most important repairs running several hundred each, so i just didnt have the money. It may take a couple days but I'll def let u know what happens. I would've traded in already Matt but i need a couple of months to be financially set to handle the pymt. i was hoping this one would hold out for me. But its winter so i dont see it happening. i was hoping to spend the minimum and get what life i could out of it until i could afford the new one. i start a new job on the 27th making more $ but its biweekly pay and i NEED the car to get me there. I will keep u in the loop, though i assume i have at least a couple of urgent issues now. Hopefully it'll be something i can pull off! Thanks again so much for your time and wisdom. im gonna become one of those kick ass girls that knows how to fix 🚗 ;)

thanks,learn more(謝謝，學習到更多)

my ford mondeo 2.5 v6 auto keeps moosing when revved in park or neutral and then it stalls. it drives fine in drive mode? would this be the icv?

Thanks for sharing great information

nice job

So my truck is occasionally running a high idle when I crank it up but when I put it in gear, it's idle returns to normal. Do I need to change my IAC or is it something else?

thank you bro

2.0 94 mitsubishi engine, looks like an 02-03 lancer. I'm having an extremely low idle problem, getting a tap from what seems to be the purge solenoid. and a creak when it idles up. I'm assuming my iac is sticking, along with the purge valve.

Im having issues with my Pajero IO 1.8L. I brought another IAC and coils hopefully this fixes the issue. But could the pod filter cause low rpm/uneven idle upto 2500 rpm?

Hey Matt! So they ran a test on the battery, starter, & alternator. The alt tested good but I've heard these readings can be inaccurate..?? The belt appears to be in good condition, tight and unremarkable. The oil isnt milky on the dipstick but we are having to add water/coolant to the reservoir frequently. Also the power steering fluid needs to be filled every week or so. The milky substance is allover the front of the engine. under the. intake etc. At Advance, they put a new battery in yesterday. Light flickered very dimly last night. The shuddering and loss of power has twice now been accompanied by the speedometer and rpm's jumping all the way up when i was going 10mph. Very strange. Thank u so much for your time and input. I truly appreciate it and i hope the good stuff comes bk to u!

Reading comments 54 minutes in i realise 400+ comments here LoL Thankx for the upload :))

Does a bad IAC cause random misfire code? I removed my IAC while the engine was cold, and the pintle was stuck out on it. Would that cause a random misfire?

Looks like a little young Tom Cruise lol :)

Hi how much is the valve moving on a good valve? My 2006 lancer moves only an 8th,another ?,does a faulty valve cause a high idle about 3000 rpm and also have gas in my oil dipstick. I have turned the key on then unplugged the valve wiring until it was as far out to close it fully where it idles perfect but after about 3 starts it begins again

Will do. I don't know much about this stuff. I got a Megasquirt system and will have to get someone to program it for me. Bit off more than I can chew.

thank you Greg for the reply, my case however when aircon is on the rpm stays at between 1500 and 2000r/min

There is a good chance of being found passed out of dead with your dusk mask on... That thing is used for sanding, mowing yards, etc. Pull the car out the garage or park it in the garage in the opposite direction to exhaust the fumes outside. You need a oxygen mask if you want to continue to do things this way.

Replace the idle air control valve. Check the idle adjustment screw if it has one. Clean the cavity of carbon.

, I had idling issues after my engine gets warmed up. After months of googling I found IAC is stuck on my palio 1.2 (2002). So I have removed it and cleaned with carb cleaner. I also loosened the spring and removed the pintle which comes on it without measuring. Now the problem is I don't know how to recalibrate the pintle which is present on the IAC. I don't know whether to tighten it till the end of thread. Because I'm concerned about the free back and forth movement of the IAC. Please let me know if you guys know how to calibrate or how much should I tighten the pintle on my IAC. Thank you!!

Sometimes when idling low does moving the distributor help?

Thanks !

Hi Matt, thanks for your video it is very informative. I have a Chevrolet Tacuma that is causing me a whole host of problems because I live in Britain most garages don't see them very often. I love my car, but, it has a fault that doesn't show on any computer and it has now been to 4 different garages in 6 weeks. The issues is I turn the key to start the engine and it either doesn't start but makes the usual ignition noise of a key turning. Or, it starts for a second, and peters out... I have had the crank shaft sensor replaced even though nothing came up on the Engine Management System (computer), 2 days ago the idle valve and the problem is still there that's why I watched your video to try and get some clues. If by some miracle you know what this is, I would be eternally grateful!

MattsMotors why this bad iacv code not apears in scanner and check engine light not apear as well ,please explain it will be thank full.

Thanks, the info you shared helped.

Wearing a dust mask for Carbon Monoxide, nice!

Give this guy a break! Stop being so rude! He did what he thought/knew was right for his vehicle.

Would the iac cause an intermittent no crank no start for 7 months...its gotten progressively worse...almost daily. I have a po507 code. I had the throttle body replaced a year ago. 2008 jeep Cherokee 150 000 miles. Thanks

Dudes beard is launching an offensive on the shores of his neck

upstream 02 sensors can do that too matt. I had that tricky shit in my 99 ram. especially when it was hot! like 80 plus days.... very strange. I needed the help of motoyam82 big thanks to him.

I need a video on this but on a early 80s GM car that has carburetor!!!!!!!!

hi, my 96 jeep grand Cherokee stalls in low gear coming to a stop or after revving. I replaced the IAC. still having trouble. any thoughts?

thanks for your reply Matt but how would i check with the carb cleaner ? is there a video ?

correct me if im wrong but isnt the spring a return spring and when unplugged will always move pintle back?the iacv uses magnetic field to push out pintle against spring force and wonder if second test the iacv needs to remain plugged in.just wondering. also stepper designed iacv dont move at all when unplugged i think so this might only work on certain design

nice vid. you can also remove to iac from the throttle body. start the car. then in the engine bay hold the iac and rev the engine by hand. if the iac works then the pin will move in and out as the rpm raise and fall.

"The total length from base to tip is 7/8." Damn... I'm so sorry dude.

I replaced the Idle air valve for a new one and then an O2 sensor code shows up and then minutes later the code for an Idle too hight show again so the problem wasn't the Idle air Valve so what can be? 2002 montero sport 3.0

First thank you for your diy videos on cars , I have a issue I hope you can help me with , I have a 2007 Honda civic 1.8 liter that at idle runs very smooth but at when I drive motor get very loud , it has 200,000 miles and engine light is showing idle air control , do you have and suggestions , thx again

Hey Matt! Thanks so much for the video. I have an 04 Escape that was idling fine one day, really bad the next. Idles ok in park, still shuddering, but once in gear, the idling, rpms, speedometer, everything goes downhill. The battery light is flickering dimly so I had that replaced but the problem is still there. A few things to mention... the car has 165k miles and needs a tune up, incl. valve gasket covers. It is leaking oil and coolant (milky) and the serpentine belt, replaced one year ago, is beginning to squeak sporadically. I have no money at all, I'm female, in a town with few ppl to call if stranded, and I'm going to have to figure this out and attempt to fix it myself as this is my only mode of transportation. I know it's hard without seeing, but ANY HELP u may be able to offer would be so so appreciated. thank u so much!

Sir is mitsubishi verica air idle control valve is ok on lancer 2004? Is it fit?

Dude, I really like your channel but content providers who edit their videos should not admit to forgetting something nor correct their mistakes, just edit it out and rearrange your video clips please, worse case overdub your audio and don't put text on the screen, this will get you more thumbs up and more viewers and more subscribers, no worries mate.

i got a iacv custom made. and for some reason when i connect it. it doesnt suck any air or do anything?

It's not the length of your pintal that matters...it's how you use it...

When i start my car it idles between 2000-3000 rpms, i turned the car off and unplugged my idle air control valve and the idle dropped to around the normal range. I then plugged acv back in and the car was ok for a short while. Does that sounds like i need a new valve? Thanks

+MattzMotorz i did all the test on your iac video. everything look good im still getting a bad iac code.. clean the iac and trotted body.. do you have any dieas... thank you

Matt My 1999 Frontera 2.2 petrol when cold runs rough, after 5 mins it idles at 2000+ rpm. could the ICV cause this? Any help would be appreciated

Can a bad iac valve cause random stalling when braking?

I have a 2002 3.8 Mustang, it will crank but not idle long at all and automatically dies when it is pulled into gear. What can I do?

I just bought a new GM IAC valve on ebay for a custom setup I'm doing. It has 4 wires. Before making a mount for it, I decided to test it using a battery. I do have good OHM readings across the wires, but when I apply voltage to it, nothing happens. I used both 6 and 12 volt batteries. I don't know if it will work this way, but I'd really like to know that the valve works before I install it.

Thank you... Man your smart I was wondering all the same things with my evaporated sensor on my Cadillac because when cold it runs fine but at soon as its hot it stumbles and no vacuum leaks... And that was it... Thanks info video for sure,,, and not those stupid techs with all kinds of unnecessary ridiculous gadgets that most people don't have... Ol school remedy use your eyes, hands, ears👍 hey can't I slap some of your viewers😂😂😂

do this make your motor jump and almost cut off when you take the oil cap off??? please help this the code I'm getting

Just take it off once, and bench test for continuity with multimeter. 3 pins: center is +, left is open, right pin is close i think. Reading between 20-24ohm is considered 'good'. You can also bench test IAC with a 9v battery. Just get the pinout correct. Theres a vid here that shows it on a Toyo i think..cheers

after I replaced the spark plugs on my 2008 Toyota Sienna, I unplugged the throttle body and clean it, now the car won’t idle. It runs fine smooth (not rough) for 5 seconds then turns off, do I need to reset the throttle body? Basically the car stalled after five seconds. Please help.

Help!😭😭 😭 My 97 Geo metro is reving up and down in park after it warms up. Normal when in drive, but idles high when in drive. When I let go of the brake it brings me to 20 mph. It's as if I'm pressing the gas.😤I'm wasting gas!😩 All is well if i unplug the IAC valve. They say if that happens, it means it's defective. Should I replace it or clean it or check for vacuum leaks or indpect Throttle position censor? or was the unplugging test good enough to know it's bad?

I've replaced iac valve 3 times in my 1992 Bonneville ssei. Anything you can think of that would repeatedly ruin iac? Vacuum leak maybe? Took to a mechanic and he got code Boost control solenoid. Replaced that and now have code 56 for general ecm problem. I have another ecm yo put in, but think I'm missing some fundamental.

Does this have to do with my car running too rich?? I replaced oxygen sensor, throttle body but my car still showing my check engine light , cannot pass my emission test

informative, thanks...

im having issues with my 1996 Ford Ranger 4.0l with hard starting issues once it runs about a minute or so it clears up but has hesitation when giving it gas. I replaced the IAC valve, now while the truck is running if i unplug the wires to the IAC valve it dies a few seconds later so could the new IAC Valve be bad or is it good? i have no idea about IAC valves this is no matter if the engine is cold or warm if i pull the plug off it dies. the old IAC valve still ran the vehicle when i unplugged the wires. so im so confused on this issue

Thanks

good video thanks for sharing 👍

IAC's aren't cheap (but they say I am)..just wondering if you have tried reviving one by lubing the piston or working the pin back and forth, or do they usually die electrically...and I guess used ones would be risky..thanks for the helpful VID...

Im gonna try this. But is a car supposed to not start with iac unplugged? I unplugged it and tried to start it and it barely turned over then died. 98 explorer btw

I tried unplugging while idling but my IAC pintle stays wide open.... Would this indicate a faulty IAC valve? I cleaned it and the Throttle Body and didn't change the idle. Also, the spark plugs are black and motor oil smells like gas. So its running rich too. I also noticed the PO removed the idle screw plug... so they could have messed with the screw too. Thanks.

One problem with this is you can't be sure if your valve is a motor, or a solenoid. If it's of the solenoid type, it'll always go to the same place when not energized, so measuring it is pointless.

I used to have a car with bad idle valve the revs wouldn't drop below 1500rpm one week then the week after it would stall. Once it cleaned it was fine.

If the idle dropped after it warmed up doesn't that mean it's working?

hello i have car byd g3 and i have problime withe code p1652 the engine work good but the lcar dont move and svs work but whe turn of the car and turn on agian the car is moving and svs go on

Hi, if this sensor have malfunction why it can't be detected using diagnostic /scanner tool?

Hi, I also have a Lancer Cedia. It starts normally but stalls immediately after starting, unless I put my foot on the gas to rev it. It also stalls after I release my foot from the gas. Could it be a bad IAC valve?

ok I have a 2000 Nissan Altima GXE and was driving and the car cut off on me and it's a spark and gas is getting up to the fuel injectors but they're not pulsing so I was wondering what possibly it could be. and MAF sensor or the wiring around it is what I'm guessing. the ECU is good.

nice cai

Shoulda gone a little further--put the new valve and show the difference. Otherwise, good start.

Hey man, nice video! I have a Mitsubishi Outlander 2006 and it has the ENGINE LIGHT on, the computer reads "Idle Air Control Too Low". When driving and I come to a stop and try to accelerate the car, it stalls, the car turns ON again after turning the key and rides normally except when it does this. The mechanic told me I have to change a "piece" inside the throttle of the body, is this correct?

Hello Matt!!! My jeep 2000 cherokee has its check engine light on. i got it tested and it says its the idle air control valve. can i clean it or do i have too buy a new one?

What could be the cause of if it has still high rpm (2,5k) already replace my IACV. I have 4g92 engine

hello i placed a new iac in my cavalier 98 and it still revs high ,how would i reprogram my iac on tgis specific model ?

Could this be the issue if my car idles roughly? (the rpm's hover at half, then jump up to 3) thanks.

Hi my jeep Grand Cherokee 1997 is doing the Volo win win starting after a bad 2min will added it's nat range someway vor my by 30sekins will ran op and dawn please help me out

Have 94 ram 1500 5.2l with 5speed manual trans and in second gear starting from dead stop it wants to some what kind stall with a bit of a dieseling affect.

Why does my chevy silverado engine stay stuck in high idle after giving it a shot of gas?

Don't forget to check your computer loop status. Sometimes guys will put a cooler thermostat in and cause the computer to stay in open loop (limited functions). This can also cause rich mixture and hot stalling.

So I just got a new one. Should the pencil be in or out on a cold motor brand new idle control air valve. Thank you

It's hard to tell from the audio but, is there a vacuum leak somewhere? That'll do this. Just at idle? Fuel trims PCM adding or subtracting fuel.

Well done did the new iac solve the problem?

My IAC stayed the same length

Good video. It was helpful. I'm getting the IAC code, and the TPS (Throttle Position Sensor) code too. But, the vehicle is performing the way you mentioned in your video. It stalls after the vehicle warms up, or if air temperature is high, like in summer. Wondering what your thoughts are. Do you think the TPS could be a problem? I don't see how a bad TPS would produce these symptoms. But, the IAC is obvious. So, I'd appreciate your feedback. Thanks.

My handsome grandson

A good vid! You would need to know the published. Factory spec. length. cold. Then hot. Does it have only. In. Or out. Position. That is key !

A dust mask will do nothing to protect you from exhaust fumes. All that did was make it smell different.

When you talk about unplugging it while the engine is running you are describing a situation specific to only that style of "pintle" as you call it. Many are spring loaded and return to a specific position the moment power is disconnected, or will just freely move around without a spring and worn bearing.