How to Fix a Car that Idles Poorly (Rough Idle)

Does your car idle poorly, have a rough idle, or in general have an idle problem? Learn how to fix a car with high or low idle, and learn how to fix a car that idles up and down by cleaning the idle air control valve. The IAC valve is what keeps the cars idle at around 800rpms. If you turn the ac on and it idles low or your car stalls at lights or in reverse, or your car shakes at idle, this video can also help!

Throttle Body Cleaner:
Pipe Cleaners:
Socket Set:

The OG Idle Air Control Valve Cleaning video (7yrs ago):

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Due to factors beyond the control of ChrisFix, I cannot guarantee against improper use or unauthorized modifications of this information. ChrisFix assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. Use this information at your own risk. ChrisFix recommends safe practices when working on vehicles and or with tools seen or implied in this video. Due to factors beyond the control of ChrisFix, no information contained in this video shall create any expressed or implied warranty or guarantee of any particular result. Any injury, damage, or loss that may result from improper use of these tools, equipment, or from the information contained in this video is the sole responsibility of the user and not ChrisFix.


  • Alrex
    Alrex8 timmar sedan

    crackhead antilag

  • shawn laroche
    shawn laroche13 timmar sedan

    The freezing scorpion classically appreciate because red pivotally fasten against a psychotic february. messy, youthful september

  • Shaun Wood
    Shaun WoodDag sedan

    Chris is the mechanic we all wish we had as a neighbor, although he would probably hate us as neighbors after the 300th question about our rides..

  • JonyDabzz Allday
    JonyDabzz Allday2 dagar sedan

    They are both fords so yeah they are pretty similar

  • Satujoda Srivathsav
    Satujoda Srivathsav2 dagar sedan

    Hi Chris! I just started watching your vids and I have probably binged most of them. And to think you live so close to where I m (New Brunswick)is unreal . I got my first car like 8 months back... it’s a 2016 golf r.... kindly consider making some videos on a golf... the way you explain things is nothing short of amazing.. thank you

  • Ab Ka
    Ab Ka3 dagar sedan

    Thank you so much for sharing your knowledge

  • Rmx racing
    Rmx racing3 dagar sedan

    hey chris .....i love your work can say u do gods work lol, so i was thinking id wd 40 will work for this?

  • SuperDuper Geo
    SuperDuper Geo4 dagar sedan

    Mines idle drops down to 500 the car shakes goes back up to 1000 it never turns off just idles like shit

  • Edgardo Torres
    Edgardo Torres5 dagar sedan

    Thank you for making these type of videos,i learned to do a lot of stuff on my own instead of taking it to the mechanic thanks to you👍🏽👍🏽

  • M E
    M E5 dagar sedan

    Chris - want to thank for the enthusiastic videos and making fixing, repairing and upgrading vehicle stuff with easy buttons! Keep up the good work my friend. Own a 2010 Mazda CX7 and 2004 (lifted) Nissan Titan...your videos are priceless for me.

  • Yasith Nilanjana
    Yasith Nilanjana5 dagar sedan

    Chris i want to contact you. From srilanka 🇱🇰. Need answer please

  • Gone 004
    Gone 0046 dagar sedan

    back in the days they used a screw to hold the butterfly slightly open, and you could turn it to choose your idle speed.

  • Sam TropicsTM
    Sam TropicsTM6 dagar sedan

    I don't have a car but I still watch your videos. One day if I'll have one, I'll know how to take care of it properly. Lol

  • Nikhil
    Nikhil6 dagar sedan

    Man you've solutions for every problem that I face..I was just looking for a video like this and what's better than chrisfix. My car had the same problem as that of your truck...Thankyousomuch!

  • Shane Hutchinson
    Shane Hutchinson6 dagar sedan

    My 95 Subaru Legacy L postal has an idle after 10-20 mins of driving which fluctuates from about 500-1100, pulsing about every 2 seconds. Think cleaning this would help? I guess it's worth a try no matter what. The car sat for 15 years so I'm trying to fix it up little by little anyway. Thanks for the information.

  • Tony Xiong
    Tony Xiong6 dagar sedan

    Just buy new parts

  • Justin Savage
    Justin Savage6 dagar sedan

    Can I use brake cleaner to clean this ? Lol

  • Nikola Gnjatic
    Nikola Gnjatic6 dagar sedan

    Is that intake from your van? Ford windstar?

  • Jacob Shaw
    Jacob Shaw7 dagar sedan

    My 2004 6.0 F350 idle surges and sometimes dies, when the idle surges it lunges foreword. Any idea what that could be?

  • Floris Lammertse

    Floris Lammertse

    5 dagar sedan

    Probably bad piston return springs.

  • rooster sideburbs
    rooster sideburbs7 dagar sedan

    what kind of truck is that

  • Ross Deasas
    Ross Deasas7 dagar sedan

    my car doesn't have rpm gauge, it's literally just the speedometer, gas, temp, etc. but no rpm gauge

  • Shane Hutchinson

    Shane Hutchinson

    6 dagar sedan

    What do you drive?

  • JP
    JP7 dagar sedan

    Will it work, if your idle isnt stuck at a low or high point but keeps fluctuating 0_o? I am gonna try this, since its so easy.

  • Michael Pham
    Michael Pham7 dagar sedan

    Thanks for this video! Do we need to disconnect the battery first for this procedure?

  • Mike Blake
    Mike Blake7 dagar sedan

    Thumbs down are definitely from mechanics great video Chris keep them coming

  • Galaxies Of Universe
    Galaxies Of Universe8 dagar sedan

    Hi chris i learned a lot by your awesome car fixing video's now i can at least replace engine oil flush transmission replacing ball joint and more Thank You now i can do a proper maintenance better then dealer and outside mechanics most of those things i can save money

  • Darrin Nelson
    Darrin Nelson8 dagar sedan

    Any videos of your repairs not going as expected and then having to troubleshoot why. Seems like every time I follow a video. It never goes like it seems. For instance. My IAC doesn't have a gasket. Was it missing one before? Now it whistles / hums... Not sure what to do.

  • irishblue82
    irishblue828 dagar sedan

    Awesome videos, thanks for posting! Any idea how to fix a car that seems to start losing Power then kinda jerk forward? Had the car since it was new. Started at like 30k and does it when I have my foot lightly on the gas to slow down and then accelerate. I'm at 85K now. Dealer says transmission is fine but we all know if it didn't happen at the dealer it didn't happen at all and there's nothing wrong with it. Doesn't do it all the time but every now and again and I always notice when I speed up and push the gas more 🤷‍♀️ Got me.

  • Lukas Olesen
    Lukas Olesen8 dagar sedan

    can you make a video how to adjust the valves?

  • Darrin Nelson
    Darrin Nelson8 dagar sedan

    Chrisfix you should be sponsored by CA. smog test b/c that's why I am here. Thanks for the lessons.

  • Darrin Nelson
    Darrin Nelson8 dagar sedan

    How much does the TPS throttle position affect idle. More or less so than idle air control valve?

  • Crim the Northern Smithy
    Crim the Northern Smithy9 dagar sedan

    i know its a small detail but... its not RPMs chris its just RPM. rotations per minute vs rotations per minutes lol

  • Mountain Mike
    Mountain Mike11 dagar sedan

    Do you..... Do you just buy bad parts to make these videos? I feel like you do.

  • dan pascal
    dan pascal11 dagar sedan

    This!! This let me know that my high idle was mostly normal! After a few minutes the idle would drop to where it should be! I think I'll look to clean everything soon! 😁

  • OH killem
    OH killem11 dagar sedan

    My 2003 ford taurus ses has hesitations at high speeds like the RPM drops !!!

  • Ulysses handcock
    Ulysses handcock12 dagar sedan

    Ideal air control valve. Intake valve dleaner

  • My Name is Gladiator
    My Name is Gladiator12 dagar sedan

    My 08 Matrix has a rough idle. Idles at 800 but it's rough. Any ideas?

  • John de Vries
    John de Vries14 dagar sedan

    You can clearly see that they are cleaner in the pictures before and after cleaning .... however, for an experienced eye it is also good to see that it is not the same 'air control valve', in that respect I feel cheated.

  • Axel Starr
    Axel Starr14 dagar sedan

    You need to get some rust remover

  • Ismael Dos Santos
    Ismael Dos Santos15 dagar sedan

    What about a carburator car?

  • OmegaWolf543
    OmegaWolf54315 dagar sedan

    My suburban idles between 300 rpm to 1500. It constantly fluctuates.

  • willi pine
    willi pine16 dagar sedan

    i thought engine idleling is controlled by a scew which can be turned

  • willi pine

    willi pine

    16 dagar sedan

    @ChrisFix thanks Chris ,ive watched lots of your video's , especially the foggy headlight restoration using clear coat and sand paper found it very useful. Love from India actually North East India Mizoram

  • ChrisFix


    16 dagar sedan

    That is usually the case on older carbureted cars, more modern fuel injection has control valves and throttle bodies being controlled by the computer!

  • Jim Leffler
    Jim Leffler16 dagar sedan

    So no gasket adhesive is needed? Cool

  • Julio Avalos
    Julio Avalos16 dagar sedan

    Great video, man.

  • William J.Cox
    William J.Cox16 dagar sedan

    Hi Chris Fix, I'm a beginner from Myanmar. I like so much your videos about car and am really interested in your teachings and explanations. So amazing. Thank you.

  • Wanna Ride Bikes
    Wanna Ride Bikes16 dagar sedan

    Yup I found a car for sale for 500 stated stales. Had 112thousnd miles on it. I got it home. Cleaned the IAC ran like new …

  • Grim Reaper
    Grim Reaper17 dagar sedan

    My aunt's IAC is behind shit up under the window thing on her F-250 still trying to think about the easiest way to do that lol

    GARY GILL18 dagar sedan

    What if this doesn’t fix the problem

  • Douglas Bair
    Douglas Bair19 dagar sedan

    Thank you!

  • DreamClutch 503
    DreamClutch 50319 dagar sedan

    My car only does this in drive and I’m not sure what the problem is

  • Adam Eichacker
    Adam Eichacker19 dagar sedan

    Excellent video I had a high idle in my 01 mustang did this and now it's smooth! Thanks for the videos I watch alot and get great ideas!

  • Adolfo Torres
    Adolfo Torres19 dagar sedan

    So what if my car doesn’t start up after doing this🙂🙂

  • Stefan Mitrov
    Stefan Mitrov19 dagar sedan

    can i use brake cleaner

  • Mohabat khan Malak
    Mohabat khan Malak20 dagar sedan

    I am going to clean up the idle valve on our 1998 Daihatsu Charade, and the throttlebody as well. She is a good gal.

  • Davis Ebbert
    Davis Ebbert20 dagar sedan

    I was disappointed there was no "soapy wooder" in this one.

  • Ivan DLC
    Ivan DLC21 dag sedan

    What about fuel smell with bad low idle

  • beard gawd
    beard gawd21 dag sedan

    Do you have to let the part dry before reinstall or does it really matter?

  • Billy Keane
    Billy Keane21 dag sedan

    This video is really helpful. I have 1991 Honda Civic with DPFI. When I research, I find that IACV, have one tube that coolant runs through. Does your Del Sol have similar?

  • cris tellez
    cris tellez22 dagar sedan

    Install a throttle body!

  • james
    james22 dagar sedan

    Does direct Injection cars have this devise ?

  • delois richardson
    delois richardson22 dagar sedan

    Hi, I have a jaguar xtype2005,i h ave a code 442,what do I do. can you show me how it look??

  • Skidaddle Skadoodle
    Skidaddle Skadoodle22 dagar sedan

    Where did you get those offroad lights thats on your truck?

  • Luis Edward MC
    Luis Edward MC23 dagar sedan

    If the RPMs go up and down could it be the IAC too?

  • sufia khan
    sufia khan24 dagar sedan


  • sufia khan
    sufia khan24 dagar sedan


    RICHARD WHITEHEAD25 dagar sedan

    Chris Fix your awsom and a great teacher on all videos etc

  • Paul T
    Paul T26 dagar sedan

    Hi Chris. A question for you. I replaced the IAC on my 2001 F150 and the idle is higher with the new one than it was with the old one. Any ideas? Is the gasket leaking? bad IAC valve?

  • Paul T

    Paul T

    24 dagar sedan

    Update: I am an idiot! I figured out the problem and got it working great. On my truck (2001 F150, 5.4, 2V), the IAC is located at the back of the engine (almost up against the firewall) and it bolts to the SIDE of the throttle body housing. I cleaned the original IAC but it kept doing the same thing, idling around 1,300 rpm. I replaced the IAC and the engine was idling around 1,500 - 1,800 rpm!!! I got a check engine light, put my code reader on it, and saw I had 2 Lean codes. Using my ChrisFix powers of deduction (!), I reasoned that, since lean codes mean too much air getting into the engine, I wondered if the gasket fell off and I didn't notice it. Sure enough, that was the problem. I poked around the back of the engine and yup, there was the gasket, all lonely and resting on the TB. I reinstalled it correctly and it runs perfect, idles at around 800 rpm and no more codes. The IAC is in a place where you can easily drop the gasket and I should have been more careful. I hope this helps someone. Thank you Chris, for giving me the confidence and reasoning to figure it out and fix it! I figure I saved at least $250!

  • Taylor Garrett
    Taylor Garrett27 dagar sedan

    could this be whats wrong------- instead of phazers on my f-150......idles real rough....

  • KarasouTengu
    KarasouTengu28 dagar sedan

    I just cleaned mine, and now I have worse idle Issues lol. Not sure what happened, but now it doesn’t wanna idle...

  • Green Drop Talk

    Green Drop Talk

    26 dagar sedan

    No problem!

  • KarasouTengu


    26 dagar sedan

    @Green Drop Talk Ill have to check that next. Appreciate the help!

  • Green Drop Talk

    Green Drop Talk

    26 dagar sedan

    Have you tried to clean the mass air flow sensor? That can cause the idle issue also.

  • KarasouTengu


    26 dagar sedan

    @Green Drop Talk Funny, after it happened I did something very similar, but I did end up putting load by driving down the road and back. Thought the heat would help. It runs "fine" now, But I still think I might of screwed up somewhere. RPM's dont drop as they should after warmup.

  • Green Drop Talk

    Green Drop Talk

    27 dagar sedan

    @KarasouTengu 1) Turn the ignition key to the RUN position for 2-seconds. Do not start the engine. 2) Start the engine and run it at 3,000 RPM until the radiator fans come on. 3) Then let the ending idle for five minutes with no loads (lights, heated seats, rear defogger, blower motor, radio, etc OFF) 4) After five minutes, shut off the engine.

  • Dan Stiurca
    Dan Stiurca29 dagar sedan

    How many cars does this guy own, and why are they all broken?!

  • Lorayne Bouck
    Lorayne Bouck29 dagar sedan

    Should you disconnect the battery before disconnecting the electrical connector from the IAC?

  • Thomas Harris
    Thomas HarrisMånad sedan

    Can I just unplug it

  • Ron Jaeger
    Ron JaegerMånad sedan

    Thanks for your help I have the same problem with a Mercruiser 150 outboard My idol is very high and won't come down

  • Nick Younger
    Nick YoungerMånad sedan

    Hey Chris! So I haven’t found any vacuum leaks since I don’t have an IAC, but when I cold start, it gets up to 2200rpm, drops to 16-1500rpm then when it’s warm it’s at 700-800, already cleaned my mass air flow sensor so I’m not sure what Else it could be🙁

  • Green Drop Talk

    Green Drop Talk

    27 dagar sedan

    Have you tried to clean the throttle body?

    CAAARRRLLMånad sedan

    What’s a good idle?

  • KyleSWS
    KyleSWSMånad sedan

    My IAC valve (AC4224) looks different. Will that effect how it is cleaned?

  • Ferdinand Joshua Ligtas
    Ferdinand Joshua LigtasMånad sedan

    salamat Chris

  • John Grey Hunt
    John Grey HuntMånad sedan

    Ty Chris I had been changing alot of hoses and tring to figure out how to fix the idling now I know what needs to be done but I also have problem with timing belt my car is 2001 ford escort es theres no repair manual for it to fix the problem.

  • Bigjoelow
    BigjoelowMånad sedan

    Can you truck shake also two if that needs to get cleaned

  • Adolfo Torres
    Adolfo TorresMånad sedan

    The fact that i have this problem right now and your video pops😩 it was a sign😭

  • T M
    T MMånad sedan

    Nice !

  • Tauseef Qamar
    Tauseef QamarMånad sedan

    Hi Chris. I would like to know the difference between electric and non-electric engine. And also what are the possibilities not fixes in electric car.

  • Karan
    KaranMånad sedan

    Hey Chris - Every time I watch any of your videos, I want to quit my job and become an Auto repair expert!

  • ivan sanchez
    ivan sanchezMånad sedan

    What causes the RPM to “fluctuate” and go up and down after a cold start?

  • Daddy Bo
    Daddy BoMånad sedan

    Dude. I love all your videos. You’ve helped me out so much!

  • O̷n̷y̷x̷R̷o̷o̷s̷t̷e̷r̷
    O̷n̷y̷x̷R̷o̷o̷s̷t̷e̷r̷Månad sedan

    Is this part also called a “secondary air injection valve”? I have an impala and it seems to be very similar to this part ur replacing.

  • mariooo477
    mariooo477Månad sedan

    Hey Chris, my Peugeot 206 is struggling to start and after the first startup it idles at about 1200RPM, then goes down to 750 RPM in 2-3 minutes but when I turn on the AC, lower the windows or turn on the headlights, my RPM is fluctuating and is almost stalling. Do you think it's the IAC or do I have some alternator issues (the battery is fine, I've changed it 1 month ago).

  • Mubashar Bhutta
    Mubashar BhuttaMånad sedan

    I got this problem in my car

  • 1sotheary
    1sothearyMånad sedan

    So why did over 900 people dislike this video? Weird.

  • Nathaniel Rivas
    Nathaniel RivasMånad sedan

    Mines a Dodge Dart 2015,it’s going to be really difficult to remove it

  • Gerard Labrecque
    Gerard LabrecqueMånad sedan

    I like your videos

  • 08HR350z
    08HR350zMånad sedan

    Hey chris fix i have a used 08 350z that was beat to hell by the previous owners and when you pull up to a red light the idle drops to 400ish car almost shuts off then rebounds. It happens when i turn the car on after its already been warmed up, do you have any ideas ? Its the vq35hr motor with dual air intakes i checked both throttle bodies and they're clean.

  • Richard Jones
    Richard JonesMånad sedan

    Love your videos, man! You're killing it!

  • TheAlphaWolfLegend
    TheAlphaWolfLegendMånad sedan

    I got a question my 97 Honda Accord sometimes when I start it, it does this thing where the rpm goes up and down. I think they call it surging, but what you think the problem is?

  • Melanie Grabec
    Melanie GrabecMånad sedan

    Steve you have to do it today and I’m not gonna do that lol I don’t wanna do that anymore I don’t have a problem I just got a phone number from the store and I’m not sure how to get a hold of it I have no problem I don’t wanna know what’s up ⬆️ I’m sorry 😞 and I’m not going back with me I’m not going back and forth to

  • Melanie Grabec
    Melanie GrabecMånad sedan


  • Melanie Grabec
    Melanie GrabecMånad sedan


  • Melanie Grabec
    Melanie GrabecMånad sedan

    You should fix your car fixed your car fixed your car fix it or fix

  • Melanie Grabec
    Melanie GrabecMånad sedan

    Go buddy go to all you should go do this fixed jack up your tank

  • Jon Tom
    Jon TomMånad sedan

    Your videos really help out a guy with an old car and little money.

  • Omar Muñoz
    Omar MuñozMånad sedan

    Hello Chris, I tried doing this on my Tesla and I couldn’t find the iac and I don’t know what to do, please help😰