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

Publicerades den 3 sep 2020
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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  • salamat Chris

  • 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.

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

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

  • Nice !

  • 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.

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

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

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

  • 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.

  • 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).

  • I got this problem in my car

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

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

  • I like your videos

  • 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.

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

  • 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?

  • 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

  • 😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😚😍😍😍😍😍😍😍😍🥰🥰😋😍😍😍😍😍😍😍😍😍😍😍😍😇😇😇😇😇😇😇

  • 🤬

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

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

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

  • 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😰

  • Is excellent presentation l loved,l to see how to replace the spark plugs for 2011 Lincoln MKZ.

  • This channel is amazing. Not only you give us an amazing guide on how to fix, clean, or replace something in the car. You also take the time to explain why you want to replace/clean/fix a part, where said car part is located, and give us a visual on what does that part do and why the part is important in the car.

  • Perfect video very well done 👍 I appreciate you doing such a thorough video ! Liked this video !

  • I have bmw e36 316i the problem is rpm not go up more than 4000 when i drive but when the car is parking it can be more as normal cars You can see how is my car on my channel Is somebody knows hot to fix it please let me know 😊😊

  • 948 dislike from engineers did lose their job hhahaa

  • Hey ChrisFix, is it also possible that my car had also same problem as this content shows? I currently experiencing a rough idle and less power on my engine. I also checked the hoses for the leaks but theres nothing I can find in the hoses. Also I suspected that maybe the throttle body will be the problem since the last time I use it the gas pedal stucks but it goes normal when I stomp it harder. Already checked the pedal but theres no problem with it. Anyway your vids helps me a lot of having ideas to go for a minor fix before jumping into a major ones :)

  • Not only a great video, but instructional as well. Keep up the great work Chris. Thanks for sharing with the world!

  • This is off subject. Acura with a code p0344. Replaced the camshaft sensor n code still on. Any suggestions?

  • Dude I don't know if you know how amazing you are but I'm a girl iv never worked on a car but I can do this!! Thank you so much 🥰

  • My car start shaking and stalling, thank you im a try what you suggest here.

  • So if my idle air valve not gettin any current tht can cause the car to idle rough right especially when you put it in gear ??

  • What is pcv hose for on Mustang?

  • You really are a golden guy!

  • @ChrisFix Excellent video, as usual. You are my favorite mechanic on YT. You are quick, without Ums and Ahs. Other people I often set to 2x speed, but your videos are just right. I am excited to watch any new videos. I sure with you worked on motorcycles. Great job! "For all have sinned, and come short of the glory of God;" Romans 3:23 "But God commendeth his love toward us, in that, while we were yet sinners, Christ died for us." Romans 5:8 "For the wages of sin is death; but the gift of God is eternal life through Jesus Christ our Lord." Romans 6:23 "For by grace are ye saved through faith; and that not of yourselves: it is the gift of God: Not of works, lest any man should boast." Ephesians 2:8-9 “Now we know that what things soever the law saith, it saith to them who are under the law: that every mouth may be stopped, and all the world may become guilty before God. Therefore by the deeds of the law there shall no flesh be justified in his sight: for by the law is the knowledge of sin.” Romans 3:19-20 "For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life." John 3:16 "That if thou shalt confess with thy mouth the Lord Jesus, and shalt believe in thine heart that God hath raised him from the dead, thou shalt be saved. For with the heart man believeth unto righteousness; and with the mouth confession is made unto salvation." Romans 10:9-10

  • Sir cris...why is that when car go downhill the RPm goes down And stop the engine if I don't step gas pedal even if my gear position in L1...

  • My truck was having the same problem and this video fixed it and I might have used something else then carb cleaner but it worked

  • When I'm at a stop light and my a/c kicks in the car accelerates like someone stepped on the gas. What is that about?

  • I have 2007 4Runner I don’t think it have that

  • I’m binge watching lol will differently check the other video out too! More good information here. 🙋🏼‍♀️

  • I did this on my 2001 B3000 and bingo! I've been trying to figure this out for a year. Thanks Chris Fixx!

  • Chris (Or anyone knows the answer please comment below) can I use "break parts cleaner" to clean the IAC?

  • This happened to me this morning and I wasn't even looking for a solution and hear you are Chris, will get on this tomorrow and get back to you.

  • Wait...why are there carbon deposits?! The only thing that passes through is clean air!

  • my motor sometimes die idle.. could it be my IAC?

    • @Green Drop Talk Thank you :) I will try that. It would be amazing if it was that simple.

    • @benn61 I'd try cleaning the mass air flow sensor then if it resets after disconnecting the battery. You can also unplug it and see how the vehicle reacts to get an idea if it is the sensor.

    • ​@Green Drop Talk Thank you for replying. :) after having done more research, I think it is a dirty mass air flow sensor. And no, there is no engine light. Sometimes my car wont start at all after dying, then removing one battery pole for 30 minutes makes it function for a few days. this has worked without fail for 4 times.

    • It could be. It could also be a dirty mass air flow sensor. Do you get a check engine light?

  • Thanks a lot Chris you are a great teacher even my wife understood. God bless you man.

  • I am new to fixing my own cars just wondering if this Would also cause my 07 chevy trailblazer to shift high it never slams or jerks when shifting tia

  • Thankx gota try mine.. I have unstable idle issue

  • Thanks

  • Hi bro.. I feel like im back to school.. 🙏 i used to study motor mechanic. Unfortunately i had to give up it and started to do another job.. But since i wanted to buy my own Pick up.. I saw your vedios coming up.. Now im addicted.. Thank you so much for your support and knowledge.. Keep it up👌👌👌👌love from dubai

  • Mines goin up and down and then sits at like 2000-2100 rpm and then when it warms up it runs fine

  • Hey Chris, i have a bmw 525d 2004 and i have rough idle on cold engine can you tel me what the problem might have? thz

    • It could be a number of thing. Is the oil changed regularly? Thick oil can cause this. Also the mass air flow sensor can cause this if it is dirty, you can clean them. Could also be spark plugs. Just a couple things for you to try to check. Hope it helps you.

  • @chrisfix I tried this ... cleaned out the IAC valve and the throttle body and it actually got rid of the check engine light.. but it still idles poorly around 1400rpm while in park and 800rpm when I shift into drive.. I'm confused now.

    • @Green Drop Talk I'll definitely try that in the morning. Thank you.

    • It could need a relearn for the throttle body. Also, try cleaning the mass air flow sensor.

  • I BROKE IT... 2000 S10 4.3 Map Sensor end broke off and fell down inside intake somewhere. Will the engine be damaged if not removed

  • Will this cause your engine to rev up high between gears

  • Hey bro @crhisfixit that’s my problem I have a 06 cobalt it shakes idles cuts off

  • High idle even after replacing IAC. Any ideas?

    • Try cleaning the mass air flow sensor and see if that helps.

  • Another great channel is Watch Wes Work.

  • Mate this is very helpful I have a 1990 GMC Sierra that you have to rev to have run and this was the reason why. I thought it was the fuel filter

  • @chrisfix I didn't find mine the engine is vvti

  • what does it imply if it idles low or high? he also mentions stalling. i got lost.

  • Hi Chris, can I use WD 40 instead?

  • These idle air control valves are worth $500 brand new

  • Eh Chrisfix, got a question, my 01 mustang gt 5spd bogs down under load, had a check engine light for p170...4 I think it was remember it said lean bank 1. So I changed the maf out, new IAC. Before that I put all new plugs and coils, still bogs, any idea? I know my way around a tool box but not a pro. Dont wanna keep throwing money at it HELP PLEASE!!

    • P0171 -System Too Lean (Bank 1) - The Adaptive Fuel Strategy continuously monitors fuel delivery hardware. The code is set when the adaptive fuel tables reach a rich calibrated limit. Possible causes: Fuel System: ·Contaminated fuel injectors ·Low fuel pressure or running out of fuel (fuel pump, filter, fuel supply line restrictions) ·Vapor recovery system (VMV) Induction System: ·MAF contamination ·Air leaks between the MAF and throttle body ·Vacuum leaks ·PCV system concern ·Improperly seated engine oil dipstick EGR System: ·Leaking gasket ·Stuck EGR valve ·Leaking diaphragm or EVR Base Engine: ·Exhaust leaks before or near the HO2S ·Secondary air concern Powertrain Control System: ·PCM concern Check for any vacuum leaks first.

  • I mean that's great and all but everybody says it's the IAC. I recently did a timing belt job and my car was running fine about 1100 rpm cold start and 900/800 operating temp. 70 miles later the car is idling lower around 400rpm. First thing I did was remove the IAC and clean it, nothing changed. Next I adjusted the TPS, this made a difference but not lasting, as it is still too low on occasions and is surging now. I don't have any vacuum leaks. Today I topped off coolant, next up is ECU reset and fuel filter change. I don't understand how all of a sudden my car just changes idle, it was running great. Any suggestions would be appreciated

    • Try cleaning the mass air flow sensor and/or the throttle body and see if it gets better.

  • Hello Chris! I have a mustang gt 2000 My idle its stable, but its not stable while I start to running with. THANKS

  • done this on an 2004 svt mustang and helped. Thanks

  • I might have to change my tactics and get some carb cleaner because all I have is an entire shelf full of brakleen.

  • using your video was able to track down my problem. A pack rat was living in my air box. I had just replaced air filter it was new with a hole the intake was stuck the cloth getting stuck in hinge,. Cleaned as per your advice. Fixed will put screen inside box at opening. Thanks well done.

  • Awesome Channel Chris! I learn a lot from your video's. Keep up the GREAT Job!

  • i heard them cleaners are to harsh and to instead use electrical spray cleaners

  • Hey Chris i have this coldstart idle fluctuation and immediate stall problem over5 years after startup but had this car for a decade how come it never stalls when driving ? Could it really b IACV

    • @Green Drop Talk oh that reminds me since still is original ya im cautious about the pcv too thanks

    • @Ultimate 2000 Then yes it could. Also check the PCV system.

    • And he charged me full labour and brake cleaning oil change 220 cash im still running the engine 115% oil before was more engine is doing its job of spewing out the extra oil

    • @Green Drop Talk i know it was overfilled 1quart after the job and to oil change

    • @Ultimate 2000 If you had the valve cover replaced then there shouldn't be oil with the new plugs unless it wasn't cleaned out. You can pull plugs and see if they have oil on them.

  • isnt this egr valve

  • Chris how to I have a 2004 ford escape and my steering sounds funny everytime I turn the wheeld

  • this channel is basically a shop service manual replacement for late '90s rangers

  • Your videos helping me every time. Thank you.

  • Hey chris imma tell you something.When you are on neutral its not necessary to hold down the clutch to start the car

  • thanks chris, you deserve the analytics love you get for the clear and awesome videos. ive been fixing up my 2003 Saab 9-3 SE vert (og 9-3) and your videos have been sooo so helpful with diagnosing any problems ive had.

  • Would dirty isc cause surging ? My car surges sometimes when I come to a stop. Doesn’t stall yet.

  • Just happened to have a Maserati laying around - I got a few myself - sure. : )

  • i will try to do this tomorow in my car, i back with the results

    • @Green Drop Talk gas 1.6 16v

    • @Radeo Dreams Diesel or gas engine?

    • @Green Drop Talk symbol renault 2011

    • @Radeo Dreams What type of vehicle do you have?

    • i cant find this aprt on my car, have any place we can post pics and ask questions for Chirs?

  • Thanks ChrisFix and I will be doing the same thing to clean it, and thanks Mr ChrisFix the almighty God is blessing you.

  • Good tips Chris. Shame people post negative comments. No need when the tips are of sound advice

  • Thank God for this man

  • My 94 accord rpms go up and down when im in neutral or park and also in drive but only if im not giving gas

  • bro i can’t even drive and now i want a project car

  • Thank you so much I've learn a lot very useful... Thanks for sharing your knowledge.... From Philippines.

  • IAC valve- broken Chris: □be sad ■HEY GUYS, CHRISFIX HERE!

  • 4:53 What're you doing, Step-Mechanic?

  • can this cause a check engine light too?

    • It can. It would most likely have the code P0505.

  • Can this cause your engine to not start up properly ? For example when you turn on the car engine the engine struggles right before it starts up . Once the car is on it rides normally

  • Vales don't talk mister!!!

  • Is this any way similar to the mass airflow sensor?!? My car can't be idle for to long cuz the rpm twitch and drop until finally it turns off 😭, I cleaned the mass airflow sensor and it hasen't happened but I wonder if this might be the problem🤔

  • I’m surprised at how much carbon is formed in the IAC....isn’t it meant to be filtered air going in there before it reaches the combustion chamber....

  • Why don't you use gasket sealant as a precaution?

    • @ChrisFix Do you use gasket sealant when changing a water pump?

    • No need to on a surface like that with a gasket in good condition!

  • What if you have a bad hose on the vacuum on your Mustang