How to Fix Engine Idle Problems in Your Car (Rough Idle)

How to Fix Engine Idle Problems in Your Car (Rough Idle)


About the Author: Michael Flood

100 Comments

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  2. Funny, that's not how you clean the Idle Air Control Valve, sure, some of the spray you put in the throttle body is bound to make it down to the actual Idle Air Control Valve but you really need to take it off completely. Cleaning the solenoid side is rarely needed. since it is sealed up but you sprayed the heck out of it and that was hilarious.

  3. I have a lincoln zephyr 2006 the rpms go hight when im driving and check engine light starts flashing also when i get to 40mph the car starts shaking.. and also when i want to start my car i have to play with the ignition switch in order to start the car i think its the ignition switch cilynder but i dont kno if i need another key or if i can use my same key or if i have to reprogrammed my key again please help thanx

  4. I have a 89 s10 pickup with a 2.5 liter engine. Couple weeks ago lost the clutch. Pedal went to floor. drove back home in snow I 1st gear. Was about there when the idle started to get high. Hooked snap on red brick up to it and was given a code 35. Install new IAC and it still idles high. I am getting tired of putting stuff on this. How do I tell it to idle right now!!

  5. I have a puzzler for a 1992 isuzu trooper. At start up it runs good, but when it warms up the idle is rough I cleaned the entire air intake assembly right down to the valves.
    It has new spark plugs, so wires, and most fo the vacuum lines replaced.
    When warm it sounds like it has a random misfire, and the check engine light will come on when the throttle open, but the light turn off at idle.
    I'm so confused.

  6. Corolla ae 100/1994/5A- when on my ac rpm gose up and down.i was change iac and tps in trottle body.can you advice the reason for this ?

  7. Scotty Kilmer!! I need your help! My rpm fluctuates and there’s a burnt smell. The check engine light is on and it shudders every now and again.

  8. Hey Scotty I replace the iac/tps sensors on my 2003 Buick Century and the iddle still goes sky high. Also when I accelerate it hassitates. Please help me.

  9. Hey Scotty my honda accord 2002 3.0 v6 has a rough idel and sometimes shakes and misfires what do u think and ive been watching your videos for the past year or so now since i watched your videos for firat time im subscribed brother cheers

  10. My 2008 accord
    Rpm drops at park from 1000 to about 500 but doesnt do all time
    I have noticed it happend after a long drive
    And i have noticed its stops happening after turning off internal fan motor

    Tht lets me conclude its somewhat related to electrical
    Any one

  11. Hi ,i have a 2004 rav4 the engine check light came on when i scan it i got a fuel rail pressure sensor reading. I changed the sensor and am still having the same problem. When the vehicle is cold and you start it, it throttle then the check light comes on once the vehicle reaches operating temperature and u turn it off then restart its ok. Wat do u think is causing that?

  12. Is there a computer or tuner that I can use to tune to raise my idle speed like a Flashpaq tuner chip? I have an 07 Dodge Charger 3.5 V6

  13. 9 years ago and a month too late for me. My 2000 Grand Prix started doing this and I did exactly what you prescribed, cleaned the TB, idle air, and also the MAF sensor, all problems vanished!

  14. Scotty did that and still have the problem on a Corolla 2013…. Goes from 1000 to 650 rpm and then back up to 1000…usually at the red lights

  15. Oh my gosh I'm so glad I found you..my dodge ram 1500 rpm idle revs and falls revs and falls and when I go to back up it sometimes dies or when I come to a stop it dies..once it dies in the middle of a u turn at a light in rush hour traffic..freaky..all my wiring is going out all my switches I just replaced they all went out not the fuses either it's horrible..it sounds rough I got an oil change it's just a mess the radio is high pitched and some of the speakers pop so loud they scare the CRAP out of us the windshield has condensation. On the inside sometimes worse than the outside it's horrible. Help I put synthetic oil in the truck ..I'm not a rich lady I am raising a daughter my husband passed away..so I'm trying to do what I can on my own..so what do u think it is?

  16. I'ma woman I need a lil help men's b4 taking my car 2 the shop so mechanic want try 2 get over on me. When I crank up my car it idle up high and than comes bck down 2 normal running. It never cuts off at lights or anything like that.

  17. Scotty I have done this with my 2009 nissan versa SL and it looks good and clean but now my car hadn't changed much no error codes pop up and it runs even worse while Ac is running what else could cause my car to idle rough stop and go. It didn't stall but it acts sometimes when I stop like it wants to rpms go under tolerable levels

  18. I really appreciate your videos my 2004 Mustang GT was idling rough and I could not figure it out. New plugs air filter nothing helped it it would stumble and misfire at an idle but once you got into the throttle it straightened right out as soon as I clean the throttle body at idle perfect thank you so much for giving us your time just show us little things like this

  19. Scotty i have a 2004 lancer i cleaned the throttle and the air control valve and the idle keeps going up and down … What else can it be..?

  20. Is this legit? I guess I need to clean mine…? Any replies please, I have a 2012 Hyundai Elantra limited.
    Thank you

  21. my cars idle drop 0.5 down when ac is turned on. even i start fan not ac then also drops. and ac is working good

  22. Hi Scotty! One question about an old seat Ibiza 96 with 1.4 gasoline engine 60hp. When the engine is cold, it starts very difficult and dies immediately. It can't keep any idle. When the engine is warm, the idle is fine. Do u have any idea what the issue might be? I cleaned the throttle and the idle control but no result. There are no vacuum leak on the intake manifold. I replaced the coolant temperature sensor as well.again no positive result. Thanks for your reply in advance.

  23. Need some advice I have an astra life 1.8 automatic on first start up after a few seconds my car starts to shack and rev on it's own does this for about 60 seconds then goes to normal……. then it struggles to get to 70mph it jumps to 3rd and 4th gear losing power what could this be ?

  24. Hey scott what of i did this already but still the same issue, can it be the intake air temp sensor?

  25. I cleaned the TB unit, still the rpm is at 650 on idle on hyundai i20. Now, I checked for resistances of each 4 ignition HT cables. The 4th wire being the shortest is supposed to have lowest value, however, it reads 8.8 ohm which is very much higher than all the 3 wires..2.4,.2.0, 1.8 respectively. Is the 4th wire leading to drop of rpm to 650??? Awaiting reply. Thanks.

  26. I've all ways done this with the car running well I mean I cleaned it first then cranked it up and sprayed the cleaner while reving the the engine a little funny how no one ever said that was the wrong way to do it but then again you're a 50 yr mechanic so I trust your judgment Scotty

  27. If you have any car questions, just visit Scotty's channel so he gets his check from Youtube. He won't answer them!

  28. Just wanted to say thanks by cleaning the throttle body on my 1990 Mazda 626 DX with the cleaner you recommended helped tremendously. My car runs like new so now I can dive back and forth from college this fall.

  29. It is worth noting that on newer vehicles you should never open the throttle by hand because it is electronic and could cause damage to the throttle body.

  30. I have a question about a chugging sound from my 2017 Tacoma it makes the same sound as a standard car would make is you dident give enough throttle

  31. i have clean the throttle, but it still surge

    i have drive by wires car
    could it be the tps or di idle valve?

  32. Hello. I have the same problem but my car's throttle body seems to be plastic. Can I apply the same techniques on a plastic throttle body? Thanks!

  33. i change the throttle body and idl control valve and throttle position censor and mass air flow censor still the same for me any one can help on my car seems like someone is pushing on my gas pedal and wont let go high idle

  34. My brother cleaned my car throttle body and didnt let it air dry out and he started the car again one time amd now thr car doesnt start. It starts by placing your foot on the gas to start and when u take off your foot it cuts off. What the problem?

  35. I've got 2009 Toyota corolla I cleaned injectors changed,ignition coils and plugs also cleaned My throttle body and still got a rough idle and bad hesitation when Coming to a stop or pulling off . what's your theory on this?

  36. Hi Scotty!

    My toyota altis 2008 1.8 has a problem. It usually runs fine when the AC is off. but when i get it on, each time the compressor engages the idle suddenly drops to 400-500 then after 1-2 secs it will be back to normal 600-700. sometimes when the idle drops to low the engine dies but it will start immediately. what causes this? please note that my throttle body is electrically controlled by my ECU. Hope you could shed some light. Thanks.

  37. Mr. Kilmer, I have a 98 328i that will not communicate with multiple obd scanner but has power. Good fuses etc. Any ideas? I bet you can't figure it out!!!
    best,
    Jacob Olsen

  38. Scotty I need your help. I have a 09 ford fusion. All the gauges stop working then it won't go passed 30 mph even when I have the gas all the way down

  39. Scotty, 2000 4.0 explorer. Enertia switch is fine, have fuel pressure. Have spark. Just replaced crank sensor. I hear fuel pump priming. Checked relays and control box.. it cranks but doesn’t start. I’m lost

  40. My yukon when parked idle it starts to jerk like maybe every 20 sec randomly just one jerk. What could be the problem I've changed spark plugs knock sensors intake manifold gaskets and still does it. Checked with odb reader and only have 1 code p0420.

  41. I just installed new spark plugs, water pump with all the parts and timing belt of course, and purge Solinoid.. I have an 04 Hyundai Santa Fe V6 2.7L. Now all of a sudden when i start my car, with it remaining in park, the engine revs to 2 rpms and stays there unless I press the gas a little then the rpms stay up to where I pressed the pedal at.. How do I fix this new issue?? Never ever had the problem since I got the vehicle 5 years ago.

  42. Scotty or anyone knowledgeable please help! I have a 1998 Escort 2.0
    Auto. It has a low idol in drive with foot on break and (possibly
    unrelated) the biggest problem is once warmed up if in park the idol
    will rev so high I turn it off real quick so it doesn't blow something. I
    feel like I've done everything. I cleaned the old throttle position
    sensor (no difference) then put a new one on, then cleaned the old IAC
    valve (no difference), then put a new one on, cleaned the throttle body,
    cleaned injectors, cleaned valves and still same problem. I also
    replaced the Control Module relay which gave me my A/C back but did
    nothing for the idol. Please also note that after testing 4 Control
    Module relays, I found the only one that mostly worked as my A/C now
    comes on with regular air and the regular settings blow hot air. I was
    just happy to have A/C back any way I could get it. Any more ideas? Cuz
    I'm tapped.

  43. Scotty or anyone knowledgeable please help! I have a 1998 Escort 2.0
    Auto. It has a low idol in drive with foot on break and (possibly
    unrelated) the biggest problem is once warmed up if in park the idol
    will rev so high I turn it off real quick so it doesn't blow something. I
    feel like I've done everything. I cleaned the old throttle position
    sensor (no difference) then put a new one on, then cleaned the old IAC
    valve (no difference), then put a new one on, cleaned the throttle body,
    cleaned injectors, cleaned valves and still same problem. I also
    replaced the Control Module relay which gave me my A/C back but did
    nothing for the idol. Please also note that after testing 4 Control
    Module relays, I found the only one that mostly worked as my A/C now
    comes on with regular air and the regular settings blow hot air. I was
    just happy to have A/C back any way I could get it. Any more ideas? Cuz
    I'm tapped.

  44. I have a 2003 jeep tj manual, and when at a stop the rpms drop low to very low and you have to rev it up an hold it at 1, in gear or neutral. We were stopped at a costco gas pump and it stopped at 800ish rmps and held there without revving. I will look at the manifold and hopefully that’s the issue

  45. Only clicked to tell u once again ur wrong every car has diffrent idle issues the iac the tbs sensor throttle cable dizzy etc can all cause issues with idle even poor fuel so check more than just the iac and if iac is takin off like ur sopose to then spray it and then bleed coolent allways , (Scotty dosent know )

  46. Bruhh I’m so glad I watched this video, my car had been doing this for months and I thought I had a bad transmission, lmao my car hasn’t been running for the past month and this was all I had to do 😂 I just had to by some 7 dollar spray from auto zone and it runs fine 🤦🏾‍♂️

  47. Scotty I'm from the Philippines and I have a problem with my ford lynx/laser.. Aside from rough idling, another issue is that whenever I turn my a/c on my rpm goes down instead of going up.. It goes back to normal afterwards

  48. hello Mr. Kilmer,
    . at "cold start" of my car…. where going into "reverse mode".. (… as in leaving a parked space). the car jumps (hard) into gear!!…however, after the car has warmed up (parked-waiting/actual driving)… itnoticibly acts normally.. as when i first obtained the vehicle (2nd. orthird owed-me)… have had the car for about almost 8 months… approx. mls. :268.5-600 some-??… toyota avalon 1999…. lastly, i should mentioned… about twoor three months after possesing my car..I needed some transmission fluid (very low… and forgetting a most important fact as to "use the car's original specified transmission fluid).. i used a "dollar store brand" (though recently checking.. it appears to be "Dextron3…which is specifiexgor my vehicle….everything appeared to be fine until recently.. i only used a quart and a quarter amount that one time… one more thing.. I decided to check the transcript fluid.. at a "cold" start,… and after checking multiple times… the fluid is at the second notlevel… i'm hoping I haven't overfilled?.. however, again this has only been happening within the last month of two…the color of the fluid is "bright red"… just one more question:of my car…i ("no flush") can safely change?… thank you very much for taking your time out of your life, to answer any/all my questions towards concerning problem/'s to my vehicle!

  49. Can you use an MAF sensor cleaner in place of throttle body/air intake cleaner for this job? Trying to save a few bucks. I have a lot to fix on my car.

  50. Hi Scott how do you fix a Honda odyssey 2000 4 cylinder 2.5 from misfiring at a stop sign or lights an that the only time I changed the sparkpugs but still doing the same can you help I'm from New Zealand please can you help

  51. HAY SCOTT.. THANKS TO YOUR SHOW I HAVE SAVED LOTS OF MONEY BUY DOING STEP BY STEP WATCHING YOUR SHOW..I HAVE ONE PROBLEM.. THE ONLY CODE I HAD WITH MY 2002 GMC ENVOY WAS THE CRANKSHAFT POSITION … I CHANGE THAT AND SOMEONE ELSE CHANGED THE SPARK PLUGS 8 MONTHS AGO BUT THE CAR STILL SHAKES AND STALLS WHEN I TURN ON AC/ OR HEAT/ OR RAISE THE WINDOWS,, THANKS

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