Ford Idle Air Control (IAC) valve test (how to adjust minimum idle speed)

[@patrickstone7]

This video is about a decade old now, and it's still awesome. Teaching how the system worked helped me fix my old F-250 with an IAC problem. Paul Danner, you do a great service in teaching and producing high quality video content. Thank you. From one teacher to another, keep spreading the knowledge!

[@ScannerDanner]

Thank you!

[@tannerboaz6586]

It’s a lot easier to diagnose an issue when you know how it’s supposed to operate and what variables play into it. Helped me with me old f-250 as well!

[@Mark33090]

"Don't touch that screw unless you know what you are doing!".. well, thanks to you we do know now :) Another great video, thank you.

[@sifulowang]

Haynes manual would not go into this but you did and now my idle is set right THANK YOU!!!

[@MamaLuvsBunny]

I can feel the Passion in this Gentleman! Awesome professor!

[@ScannerDanner]

thanks man, I really do love my job and I love to teach.

[@KunioMasuda]

Judging from his confident voice, I can tell he is a one of a kind mechanics that I can trust.

[@ScannerDanner]

I promise you can. I film live and tell it like it is. I can be long winded sometimes but I've been a teacher for 20 years at a technical college, so I can't, not, teach 😉 It's just part of me now. Thank you!

[@KunioMasuda]

@@ScannerDanner My 98 crown victoria has a problem of AC compressor turning on and off every 5 to 8 seconds even on heating cycle. Can you tell me what is the problem, and how to fix it?

[@ScannerDanner]

@@KunioMasuda two things: 1. It sounds like you are low on refrigerant charge. The compressor will "short cycle" when it is low. 2. Ford systems in your year will run the AC compressor (even in the heat mode) in all positions except floor and maybe panel vents. This is done to dehumidify the air for defogging reasons.

[@KunioMasuda]

@@ScannerDanner Thank you very much for your professional advice.

[@KunioMasuda]

@@ScannerDanner My 98 crown vic had some shaking at idle, so I cleaned IAC valve, MAF sensor pcv and EGR valve and also injected Sea Form into throttle body. This took care of the shakes at idle, but decided to change all these item to new ones since my car has over 200k miles. Then the new IAC valve made a loud humming noise. So I returned this new IAC for refund. And put back the old one. Now the engine is very quiet. But I'll buy another new one to replace it for my sense of security. I'm about to replace O2 sensors also. Can you recommend what else I should replace to maintain this crown vic in good conditions? Thanks, Kunio

[@darrinfaulkner8911]

This mechanic knows his stuff.Great video!

[@TheSuburbanGardener]

Saved my ass. I just bought a 98 f150 with the 4.6, started replacing OE consumables, after all that it still had a high idle and throwing p1507. I was thinking I could have a bad intake manifold or something but, I did exactly what you did in this video (with a cheap scan tool- has live data), and sure as shit fixed me up nice. Previous owner must have tried to fix the fact that he didn't do any maintenance on the truck, by turning that screw in. Thanks.

[@melevan15]

I've heard of city/maintenance employees turning the idle higher because they do a lot of task the require the vehicle to go about 10 mph. High idle does that perfectly.

[@blue_death2146]

In my case I had a 2002 f150 4.2 and the throttle body was bent from the piece that turns the tps so it was advancing the sensor to a higher voltage this guy gave me a clue because my tps voltage was 1.8v which was high. I bent the piece back and done, I had already checked every possible vacuum leak and I finally fixed it...thanks dude you are awesome!! Keep up the great work

[@masterful132]

I learned so much from you! Here in my country they are at least 15 years behind you in dignostic. It's about method and understanding the whole picture how engine works. Thank's so much!

[@JohnJames.]

Great comment. It helps seeing it through their eyes

[@Demoreports]

99 Mustang v6. Throttle was hanging bad between shifts at 2 or 3k RPM. Replaced IAC and TPS and still had issues. With the IAC unplugged I backed off the blade screw on the throttle body till the RPMs dropped to 500 as described in this video. Plugged IAC back in and idle came up to around 650 or so and solved the hanging RPM problem. IAC now controlling throttle as it should. Apparently someone messed with the screw. Great video!!! Thank you.

[@ScannerDanner]

awesome!

[@johnbritton9498]

IAC restrictor plate solved my hanging rpm between manual shifts. Make sure to position the smaller hole opposite the IAC plug in.

[@Wiseceo]

I've seen a lot of your videos and this one I think is the best video you have posted in a while. Thanks for sharing with us

[@Feathers147]

Hi I have had a fast idle problem for some time on an old Hyundia Atos. After watching lots of vids on youtube and studying the manual I still was not getting anywhere,but...when I followed your simple method as shown in your vid HEY PRESTO, Perfection my car is idling absolutely spot on. I can't thank you enough for for making an instructional vid that actually works and took me 5 mins to fix the problem with a pair of long nose pliers. 1000 thank you's:) John C Liverpool UK

[@Firstmajortomlikestoticker]

This Guy is a "MASTER" at this !!!!!

[@robbyjones7631]

Foto Guy Watch Eric at South Main Auto!

[@jwguts]

Nailed it! Thank you very much. I had a stalling problem on my Ford that I couldn't figure until I saw your video. My numbers were just the opposite of these... TP(V) was just 0.86 and the IAC(%) was at 52. I realized the IAC was overworking to keep the idle at the desired RPM, and I had the room to play with the throttle position. I felt like I knew what I was doing!

[@kickdowndoors4291]

2000 Ford F150 5.4L my truck. Cold outside, truck will turn over but not start after 3,4,5,6,7 tries. When started, it ran like crap until heated. Replaced IAC. Fixed. Was easier than filling the windshield wash reservoir. Ford mechanics in all the forums said "Do this first, cheapest solution and 99% THE solution"

[@dljones61]

wish I'd seen this video 8 months ago, I touched the screw on my 94 Toyota Camry. will now go and do the baseline idle adjustment.

[@ScannerDanner]

Clean the throttle body first. Block the IAC passage (varies on type of valve and system) then set your base idle screw to around 400-500 RPM

[@dljones61]

Ok, it’s 11pm here in Oregon and I think your way east, you should be way asleep not responding to comments 🙈 But thanks. I’ve been fighting with this Camry 4 cylinder after I replaced just about every seal in the motor including replacing the distributor. Runs great but after long sustained drives and pulling off freeway it would super slow idle then die. Turned out to be sticking Egr valve was slow to close. Only realized this after speeding idle up with throttle stop screw. Seeing this video it makes sense. I should be slapped with a wet vacuum hose. I even have the big factory Toyota service Manuel so no excuses 🤐

[@ScannerDanner]

lol, late night beer league ice hockey game, can't sleep for hours after

[@12vgs8606]

This is an excellent question! All I can think of is that computer must be very smart to realize that the minimum idle it has observed for last many starts was higher than expected. Otherwise you are right, the code would be there any time you hold your feet on the gas e.g. say warming up the engine faster for some tests. It is a great question and I hope Paul answers it.

[@slickjoeyronn2160]

Im trying to fix a 92 mustang lx and you gave me some ideas I didnt read from another person. My mustang wont start now but it was starting at 900rpm the last time (like 4 or 5 times it was starting just fine at 900rpm because I "adjust" TPS because low rpm). I think my problem is going that direction you said. Sometimes comments enlight us. I will comment later when I try it. Thank you man

[@coreybabcock2023]

Glad i learned something today in case my van has a issue again

[@ScannerDanner]

The answer lies within the TPS learned closed throttle position. Once the PCM "re-zeros" the TPS, it will then try to correct idle speed. As long as the PCM "thinks" your foot is on the pedal it WILL NOT try to control idle speed, in fact it actually opens up the IAC during this condition to prepare for decel. Hope that makes sense.

[@efrensaclolo7021]

What is the ideal idle speed of Ford Expedition 4.6 L ? My Expy is always at 800rpm in park and in drive mode,If it is lower than 800 rpm it shake but never dies.So I just don't bother anymore after I replaced theIAC.

[@gmtech4327]

Clearly the customer adjusted the throttle plate to compensate for a potentially dirty throttle body. But the previous shop could have performed a visual inspection to have possibly revealed the root cause of the concern (throttle adjustment screw tampering). Customers/car owners do not always reveal their mistaken misdiagnosis/repair attempts until thoroughly questioned. As technicians we also wear the hat of Crime Scene Investigator's to weed through the clues & details before the repair.

[@ephraimcamacho9600]

I was just trying to fix my ford with same problems. Going to try your method and hops I fix it! Thanks for your video!!

[@gvvq-pi5ml]

Hi Paul, on ones I have done in the past if someone messed around with the idle screw, I would clean the throttle plate etc with carb clean, and I would unwind the screw so the plate was shut, then screw it in so it just touches, or possibly in 1/4 after it touches and try it there, Fords here used to be 0.7 volts on Potentiometer,,,Fred uk.

[@Mart1927]

I paused at 4:00. IAC appears to work fine, but I see the throttle position sensor is 1.14, if the tps is reading above 1.0 volt it results in higher than desired idle.

[@ScannerDanner]

It certainly can on some cars.

[@jhaskins0256]

Great video, learned a lot from it. I checked some of your items, but nothing as yet will reduce my 1300 idle rpm. 1997 Taurus, replaced IAC twice, meter checked TPS, idle set screw correct, MAF cleaned twice, vacuum hoses checked, PCV replaced and even did a smoke test. Only smoke I could find was coming out the body of the IAC around the body ring, not base plate. Cleaned throttle body, checked and it is closing, sprayed break cleaner and nothing changed looking for air leak.

[@ScannerDanner]

normal to see smoke come out of the IAC vent. Disconnect the MAF (make sure the electrical connector is unplugged to put it in default mode. Remove air intake tube, find the IAC inlet hole in front of the throttle plate and block it with your finger. Does your idle drop or stay the same?

[@jhaskins0256]

ScannerDanner Ok, unplugged MAF, removed Air Intake Tube, removed Hose infront of and below IAC. This hose had a dbl clamp on it, short hose and 90 then went over to another vacuum control box where the BB hose goes. Plugged pipe and engine RPM came down to 900 - 1000, but engine ran very rough and could hear a pop or missfire, but did not stall. Put it all back together and ran at 1300 RPM. Thanks Scanner Jerry

[@jhaskins0256]

ScannerDanner Pulled IAC, blocked both opennings and no change in idle. Tried blocking one and still no change. Pinched all vacuum lines and barely a noticable change in idle speed. No change when pinching BB vacuum line. Since I can find nothing else, I am thinking maybe vacuum leak under manifold. Didn't get any reaction spraying brakekleen, but maybe it's just not reaching leak. Thoughts?

[@DENicholsAutoBravado]

jhaskins0256 It's rare, but exhaust leaks can look like vacuum leaks. Before the upstream(s) O2 sensor, if there's a leak, the engine will think it needs more fuel to compensate for a problem and it'd be running richer than it thinks it really is.

[@ThunderHead289]

have you checked your ignition? a weak ignition will oftentimes cause a car to compensate to a higher rpm. that or straight vacuum leak as you are looking for. I just did a ranger where the fuel filter was nearly plugged and it resulted in a lean condition and high idle.

[@PeteSambolin]

good video! And this probably can help someone KOEO closed Throttle voltage should be 0.7 to 1.1 volts and by the process that you show in the video you get it at 1.1 volts that's just perfect! And by using Scanner DATA process! Very good direction how too address this situation!

[@crbradbury8282]

Heck yeah! Good additional info.

[@yrulooknatme]

so the valve is normally closed. no air at all goin in thru. so you unplug it and set the throtlevalve to 500rmp then plug the iac in and the computer adjust the valve. So if I unplug the valve with the engine running I should feel no air entering the air ports that feed the valve? if I do feel vacuum on the ports the valve is defective or not closing and needs changed out? I know the valve is clean , I know it moves , but I don't know if it closes all the way .

[@ronaldpruneda9950]

man I really wish I had you here fixing my truck dude I have a serious high idle problem and I cannot figure out what it is driving me crazy

[@ScannerDanner]

absolutely correct on that one

[@stalwartservant4063]

thank you this will help me with my ford ranger

[@ScannerDanner]

+Jorge Estevez thank you!

[@kenl9659]

Thanks for the great video. I have a 1997 Ford F 250 PU with a 7.5 L gas engine that just started "today" having low idle issues. I will check vacuum lines first, anything else you can suggest that a rookie with very little money can check?

[@jaffo7018]

Good info.. My Lincoln 4.6 has a slight idle surge at stop when not under load. Any ideas?

[@THESMOOVEGAMER]

Have you figured out the issue ?

[@jaffo7018]

@@THESMOOVEGAMER Yea think was dirty map sensor

[@tfilter6]

Thank you for a great video and wonderfully detailed explanation.

[@ScannerDanner]

Glad it was helpful!

[@walterclinton3813]

Wow I just learned so much...Thank you

[@ScannerDanner]

Thank you for watching!

[@Bahai111]

How much does this cost at a shop? Thanks for the great video.

[@ScannerDanner]

not unless you were watching IAC position too. You could match desired and actual rpm but have the IAC way out of position to achieve it.

[@satopia1]

hey ScannerDanner i have a 4.6 2v i adjusted my idle like you showed here ,everything is good but one thing ,when i put car in drive it tends to dip little low but reversr is good, should i raise idle just a tad more or?

[@brakedd]

will IAC counts on a GM valve moving up/down, corresponding with rising and falling engine load %, indicate a bad IAC or the computer controlling (or trying to) the IAC in response to perceived changes in engine load? tried a map sensor since it's a speed density system, no change. 2.2 ecotec, just did the timing chain. has good compression but wandering idle. no vac leaks, P0507 code. i suspect the IAC.

[@faustogonzalez8397]

Paul, Awesome video once again. Pete

[@shawn21998]

.o k b ol .ii.8

[@angelaprater2679]

Very good video broke it down quick.

[@ScannerDanner]

cleaning the throttle plate does allow more airflow with the throttle closed but this would not have changed the TPS angle or helped the situation at all. If anything it would have made it worse. (an even higher idle speed)

[@irocaindustrial5658]

Thanks so mucho, I was looking for this video for years, CONGRATULATION

[@kylespeck3480]

What causes stalling in reverse and drive in my 93 f150 5.0

[@JulianGuevaraphoto]

On my 94 Ford Explorer the idle is all over the place and I hear what sounds like miss fire and the rpm spikes and lowers to around 700. And when I unplug my IAC the idle goes down to 500 rpm and the engine seems to run better and no missfire sound. Bad iac?

[@SBS_Auto]

Fantastic video!

[@ScannerDanner]

anytime, glad you liked it, thanks

[@Pengy39]

Would have cleaning the throttle plate reduced the TPS voltage and allow more airflow at idle?

[@stinkycheese804]

That's not what you want, rather you want the ECU to be able to make slight adjustments in differing idle load states such as battery charge or A/C cycling, other electrical load, etc while the throttle plate at idle is just that, a fixed value that won't change with the load. BOTH your throttle body and your IAC should be clean for good operation.

[@itspickle6664]

07 Ford tarsus stalls at lights or in park. I changed the iac and cleaned the throttle body and it didn’t help any. I bought a obd2 got a code for the idle air control circuit, cleared the code it hasn’t came back but still stalls I need some help

[@jeprerderwererwer56]

Hey Danner, i have a 2004 Ford Focus mk1 1.6 16v petrol. i have a problem with the idle, if the engine is warm, when I'm driving, and when I need to shift and press the clutch the idle drops to about 500 rpm than it raises to the normal idle speed and stabilize.And I've noticed that the car doesn't stay idle when letting it rolling in its 1st or 2nd gear. It stutters and keeps it with lots of work at normal idle speed. The car remains with a lot of trouble rolling, and does not fall out. But as soon as I move up a bit, the speed drops very low, and stutters but the car doesn't fall out. i already replaced the idle air control with a new one aftermarket Pierburg. i alread have reset the ecu 1 day disconnecting from battery and let is warm up at first start. also i have cleaned out the throttlebody and replaced the tps. The car idles very smooth when cold or warm and does not move any inch. once a week the car starts hard and stutters. The car drives very good and has lots of power. im lost and dont know what to do for this problem danner. Can you give me a suggestion pls ?

[@OldSchoolNoe]

I've seen the idle air control on a new edge Mustang v6 with no idle issues at around 52%. No stalling while decelerating or any other engine performance issues. Idle RPM is at spec. (between 700-730). Near the end you stated that this could potentially be an issue, can you elaborate on that? Maybe if I was stopped at a red light, uphill.

[@ScannerDanner]

If you don't have any idling issues or stalling issues then don't worry about it.

[@bryang2724]

I got an 01 explorer w/4.0 and didn't develop high idle till changing throttle body gasket and cleaning throttle plate, i did do a check of tps volts and its at 1.2 v. I'm gonna give this a try. I have code P1506 but already put new iacv a month ago.

[@Machia52612]

I have a 1997 Ford Expedition XLT 4.6 that misfires on one cylinder due to low idle at 550 rpm. No misfire at 650. Can’t pass inspection. Can the rpm be raised a bit?

[@ScannerDanner]

You'll set other codes by raising your curb idle screw to the point where the iac cannot reduce it anymore. But you could try

[@efrensaclolo7021]

No engine light but idle fluctuates in Park only, As soon as I put it to reverse and then drive it is back to perfect idle at 750rpm. What is the problem, should I just ignore it?It runs fine in Drive and on all stops.

[@therealdesidaru]

So, like, you need a computer now to tell you your idle screw is set too high/low? 😆I just need someone to do it for me! It's a fantastic demonstration of troubleshooting though. THANK YOU!

[@xXTECHxKNIGHTXx]

I need to be able to manually control my IAC to spin up my alternator to generate more power, but I don't have a stepper motor style IAC, it has this duty cycle version, does that mean I need to manual add more or less voltage to the IAC to get it to open more?

[@EarlGuyton425]

Anytime someone adjust one of those idle screws to compensate for a closed IAC there is an easy easy way to reset those idle screws.take off the air cleaner assembly at the throttle intake opening and just slide it over to the right. Now (without engine running) Look at the throttle plate valve and open the the throttle and close it. You should hear metal hit metal, if you don't then keep unscrewing idle crew until the throttle plate touches the cylinder opening. When the plate JUST TOUCHES the metal then that is where it goes! Then if it wont idle after starting its your IAC. When people turn those idle screws up they are bypassing a closed IAC is what theyre doing, but what is sad is that they think it is fixed. It wont hurt anything other than the engine might sie a few times at cold start up but a person can get by that way until they change that IAC

[@draizwrm]

humm, im trouble shooting a 99 windstar 3.8L, that idles rough and stalls at stops when in gear,runs smooth when accelrating or staying at street/highway speeds, the IAC is clean and working, EGR working, new DPFE, only codes 171 & 174 bank 1 bank 2 lean, throttle plate in correct position, ran good on July 1, several days later upper hose leaked and engine overheated vehicle is Not mine, current 3rd owner recently acquired it, 183670.xx miles

[@user-ms7po6rm3h]

Hi Paul at 1:57 you mentioned not knowing if it had a EGR flow problem because someone cleared the trouble codes, what effect would a EGR flow problem have on the IAC?

[@ScannerDanner]

I only mentioned that as a guide to the technician who is selling the job, to make no promises about the check engine light, because someone just cleared the codes before it was looked at. So other problems could exist. That's all. It was a cover your ass statement. An EGR flow (restriction) would have zero effect on idle speed and IAC function

[@Amopower]

Hi Paul - what if you have a third and fourth variable - an adjustable TPS and also a throttle body like the one you showed, plus it also has an air screw that you can turn clockwise or counterclockwise? I'm confused where to even start as the baseline here. (Ford probe, EEC-IV)

[@ottard]

Would it work adjusting the trottle screw WITH the iac plugged in? Just trying to mach actual rpm to desired rpm, without adjusting up the base rpm to 4-500rpm?

[@faustinogarcia5202]

Hey there... please help. My 2002 e250 van (cng) has a low idle this problem is new. It was fine then I just didn't drive the van for a long time the battery died when I jumped now it has a low idle. Ok. Im thinking that when the battery died it erased the position of the idle from the computer now the van is confused and doesn't know the correct idle position?!?!?!?! I'm so confused on what to do!!!!!

[@ScannerDanner]

Tap on the IAC motor, it's probably stuck closed. I have a video on this on a Ford

[@tamishagraves4809]

So from a customer perspective here...is what you indicated about the numbers information on your scan tool sufficient to leave things as you being content with those numbers from diagnosing issue to charge customer given its not completely where it should actually be???

[@justvis1326]

I watched some of your videos they are very good. It is really interesting how you check and tune things. Is there a way I can check the errors the had on my ford mondeo mk3 or it is only with special computer

[@ScannerDanner]

what year is that? I'm not familiar with that model. You are not in the US either I bet, so I'm not sure what scan tool you would need to communicate with that

[@justvis1326]

@@ScannerDanner haha yes, I am in eastern europe. My car is diesel, tdci from 2003, sedan with 130hp. I want to delete my egr but i want to lie to the sensors and because i don't want to search ppl to rework the computer. I wonder if my old car would have errors at all then maybe i can unplug the pipe that open the egr with vacuum air and make it stay closed.

[@justvis1326]

I gave a lot of money for repairs and i hope i can revive the car, because black smoke and loss of power got pretty bad lately. I think the problem is the egr system

[@ScannerDanner]

@@justvis1326 you can try posting to my forum and see what my community says. I have over 30k global members and it's free to join www.scannerdanner.com Best I can do my friend

[@summerandkate1386]

ScannerDanner, My 2002 grand marquis stalls while driving. But starts right up. Is this due ti Idle control valve? Any help will be highly appreciated

[@dougcrawford8975]

Very intuitive I fully understand this now and it makes since.

[@readytorvdude1224]

Do you know general parameter settings for 2004 E150 5.4L Custom Leisure Van / Diy campervan? Needing higher idle rpm for force additional amps @ idle until I can get dual alternators installed. Needing to keep a 3.56KWH Lipo4 house battery charged. Thanks

[@ScannerDanner]

You're not going to be able to change that. It is programmed into the ECM what idle speed should be. If you mess with the base idle screw, you'll end up setting trouble codes (this is a cable operated throttle body right?) The only thing I can think of would be to fool the ECM into thinking either the AC is on, or there is high power steering pressure or that the transmission is in gear. I wouldn't mess with the transmission range switch input, but maybe the AC and or power steering psi switch 🤔

[@marlonolmo5368]

Thanks for the lesson bro!😀

[@jaybird7534]

This is why I now have a 2011 Leaf EV, I'm going all electric vehicles in the future, and I recommend everyone do the same. Sorry, but I'm so done with overly complicated smogged up ICE vehicles. I'm fighting now with a IAC on my '92 40ft motorhome with a 460efi and I'm frustrated, confused, and pist off. Likely got a bad new IAC complicating the fix. New one leaks vac slightly with power disconnected. SO DONE.....bad parts from suppliers etc etc SO DONE.

[@ge0ne063]

I dont have any codes but my oil lamp comes on intermittently at a red light....could it be an idle issue or oil pump?

[@ScannerDanner]

Could be from too much bearing clearance too. Oil psi test is the next step

[@ge0ne063]

@@ScannerDanner i notice at idle when my RPMS dip below 550 oil lamp comes on and thats when im on DRIVE at a stand still...in Park RPMS hover around 850 no oil lamp comes on 🤔 gonna find a shop to perform this test. What scanner are you using?

[@bosanovaboy]

Hello and thank you for the video. Question, I did exactly as you said. At one time the idle plate was adjusted. I disconnected the IAC and the rpm jumped from 11k to about 14k. I unscrewed so the plate would close more but there was no change. According to the book my rpm should be at 700 idle. I added sandwich bag around the IAC to make sure there was no air being sucked in that area but still no change. I plugged the IAC and the RPMs dropped to about 11k again. I've cleaned the idle plate and body too. Can you think of what my next step should be? Thank you

[@kylemcweeny878]

Vacuum leak

[@James1toknow]

Scanner Danner I have a 2001 and the code is P0351 means = # cylinder coil. now this is the second coil pact I'v replace in about 4 months. I did have the intake replaced because it was the recalled one and it finally cracked and leaked. everything ran great for months and then I replaced the # 4 cylinder and now it wants me to replace the #1. I have been having stall issues and this is prior to the # 4 cylinder replaced coil pack. I'm thinking it could be the crankshaft position sensor.. Whats your take? thanks. I watch you with Eric the car guy and I love the scanners you have. I just have the OBDII code finder. Nothing more. Have a good one.

[@bluesdirt5889]

Is this cold start up ? What should the cold start be ? Rpm

[@ScannerDanner]

depends heavily on the temp and the car you are working on

[@jerrybutler1336]

i need to set my idle just 100 points higher to compensate for a weak oil pump. just 100 points will do. how do i do that on a 2002 ford ranger, 3.0 n??? i tried the screw, but the computer resets it

[@billespinosa5088]

Thank you, i'll fix mine today.

[@MrRager-em6uv]

I rearended someone about 2 months back and right after i crashed i put my car in park and it revved super high and i pretty muched destroyed my front end , i got everything fixed but my check engine light was on when i got it back for the code p0511 , before it was revving high in neutral and park but now its starting to rev lower after driving it for a while and soon my engines going to stall. Is this a bad iac valve?

[@ScannerDanner]

Year, make, model, and engine size would help me to answer

[@AamirZ]

I'm guessing you also do this adjustment when the engine is fully up to temperature too?

[@MrRopbigd]

Excellent video !!!!👏😎

[@bryanbyrd5980]

Hello my name is Bryan and I have a 2003 Ford explorer Eddie Bauer edition with a 4.6. I've replaced the IAC and the egr valve and tube. The problem I'm having us the throttle has been sticking when I come to a stop. Any information would be appreciated thank you

[@ScannerDanner]

Could be a worn throttle body. How many miles?

[@bryanbyrd5980]

@@ScannerDanner 180,000. I still need to replace the intake manifold. I've been working on and building toyota's with my dad for over 30 years. I've owned only 5 Ford's before. So I don't know much about them. Other than your constantly working on them. Thank you again for the advice and help. I appreciate it

[@artderamo8053]

Great video, thanks!!!

[@electricsanti4518]

Hello do this work on any car and what type of scanner shoul I use.

[@ScannerDanner]

not sure. the question is, Is the rising and falling IAC count the cause of the rolling idle or is it an effect of the rolling idle. My guess is it is the latter. I doubt it is a faulty IAC valve. They simply do not fail in this way. I would look close at those timing marks.

[@promethius821]

P0505 for 99 Durango(check engine also). Replaced I.a.c several times to no avail. Checked for vaccuum leaks, didn't sem to find any. Any ideas?! Been this way for over 1 year and emmissions is coming up real soon.

[@maxmarquez2911]

So what if I’m idling at 1100 and the idle screw is backing out but the throttle lever isn’t moving back

[@ScannerDanner]

vacuum leak, IAC motor stuck open, IAC is being commanded open (input issue) What is your IAC duty cycle command?

[@luisponce1472]

Great Video bro 😊

[@robertoortiz85]

Looking at my scanner-live data, i only see RPM at drive (650) and RPM at neutral(750) , is RPM at drive the same for desire RPM IDLE? . I keep getting a buzing noise coming from the air tube that the iac valve is sucking air from.

[@ScannerDanner]

roberto ortiz desired RPM is what the computer wants the car to run at. RPM should match Desired RPM. The buzzing sound you are describing could be a cracked bellows on the IAC valve itself. Older Fords had this issue. And it would also give you a higher than normal RPM at times. Pull the IAC off and look inside of it. Is there a plastic bellows inside of it? If so, gently look between the ridges of the bellows with a small pocket screwdriver, you will see the cracks.

[@berniceperry8898]

Got a question my 01 crown vic doesnt soind like it has has a high idle when I first start it, ive changed the tps and the iac cleaned the throttle body and all...got any clues to what it could be...I dont have a scanner...??? Ty in advance...

[@ScannerDanner]

are you having issues with the idle after the initial start-up? Is your minimum idle set right? Did someone mess with the screw?

[@berniceperry8898]

@@ScannerDanner sometimes when I first start it its like it doesnt have a fast idle, ill start the engine and its idles slow immediately as if it didnt idle up upon initial start... I put new intake , iac, tps, iat sensor, mass airflow, its got 276k.. Runs like new tho, I have a hesitation like wen coming outta curve on light throttle, its done that 3yrs ive put 30k on it doing that, so I ruled out bad tranny cause it doesnt slip period..when I put new intake on it started idled up perfectly then after bout 30 secs it idled down like it was gonna quit, It acted up a couole days then started running fine, gets great gas mileage but that hesitation under light throttle puzzles me an wen i give more throttle it straightens up..but everytime I give it light throttle it'll hesitate only when driving out of a slow curve.. When I got the 01 vic the old guy said they put a new fuel pump in it but I cant see were a bolts been turned..I noticed it had old fuel filter on it when I bought it 3 yrs ago, I out a new fuel filter also,...do u think it needs a pump, but it also hold 35lb 40 lb pressure on my fuel gauge....its got new plugs and coils too...the idle screw has never been touched....it actes like something grounds out after coming outta slow curve under lite load....no vacuum leakes anywhere...

[@berniceperry8898]

Even changed out tranny filter and solenoids 2 yrs ago...and new rear end gear oil.. The vic gets awesome mileage so I rule out tranny problems....its something simple or it wouldnt have lasted these 3 yrs....seems like a bad ground in my opinion some were idk.....wish I could get to you in pa I'm in southern w.v the vic is from nc and no rust period....ty in advance....I also thot maybe the passenger side cat mite be clogged when I changed the intake the whole passenger side of it was loose cause I poured water inna bottle around it...would a dobbed up cat cause the whole pass side intake loosen up??....it has a new intake now with no vacuum leaks anywhere...

[@berniceperry8898]

When I ran fuel pressure out to take intake off...the pass side back injector squirted gass outta the rail...the whole fuel rail should've been bleed out since I ran the car til it quit running.?? so I could take fuel injectors out ..when I pulled the bk passengrt injector. Out of the rail next to firewall gas Squirted and it shouldve been empty were I releived all fuel pressure...thats the same passenger side that the old intake was vacuum leaking whole pass side intake was a bad intake all 4 cylinders vacuum leak...it has a new intake now...]

[@berniceperry8898]

Could that back passenger injector be dobbed off since. Pressure came outta the fuel rail when I twisted the injector Out of the rail.l...???? Cause pressure is coming frombsomewere...

[@twizz420]

I'm having idle problems on my 07 Crown Vic Police... The car never wants to run below about 1000rpm at idle. However, the 07 CV has the electronic throttle control. Is there any way to adjust it?

[@ScannerDannerPremium]

There is no adjustment on those systems. Need to look at all the scan data related to the idle control system and also for trouble codes next.

[@donaldbrand3791]

Can that make the car run bad to if you touch that adjust screw?

[@ScannerDanner]

Only idle issues, not really "run bad" issues. Too high or low of an idle speed and off throttle stalling would be your only symptoms

[@donaldbrand3791]

See my car keeps getting hot and trying to go when I stop to a red light but my temperature gauge says good

[@chevycaprice8956]

S/D I have a 99 crown Victoria I replace the TPS now I have a real high idle that doesn't come down at all even after driving it the idle is still high like a carburetor car

[@ScannerDanner]

Is the TPS adjustable? What is your closed throttle or idle TPS voltage? If it is not adjustable, TPS min voltage is a learned value and may need the battery disconnected to reset it.

[@me-im9nr]

Sir, I had to adjust my low idle rpm , and i fixed it by adjusting the Throttle stop screw, and it also worked. But then heard there's another screw called Idle Air Adjustment Screw, which is there specially for this purpose of adjusting idle air flow? and that the Throttle stop screw should not be changed but instead the idle air adjustment screw should be adjusted? I'm really having this confusion which one should i be adjusting and what are the difference between.these two?

[@ScannerDanner]

IF you have an idle air adjustment screw, this should have been the one you adjusted. Most systems, all you need to do is to clean the throttle body to restore minimum idle speed.

[@garycrawford9959]

Still not sure how this can help. My 95 Ranger's idle speed gradually increased over a few days from 2000 to 3000, really screaming. Changed IAC valve, also found a crack in intake manifold, letting air in. Sealed crack, engine still screams. Ideas?

[@ScannerDanner]

+Gary Crawford how does it idle with the IAC unplugged?

[@d4b4y4re4kid]

So on my scanner when my explorer o1 os idleing its showing 17.2 % is that a good idle?

[@ScannerDanner]

17.2% on the IAC position? That means the ECM is commanding it fully closed. I'm assuming you also have a high idle speed?

[@d4b4y4re4kid]

@@ScannerDanner i wasnt at 17.2% then i went and fiddled with the tension screw of the throttle cable and raised it to 20% that resulted in my rpm at idle to go to past 2000rpm. So i lowered it to what i think is a sweet spot of 18% and rpms at idle show under 1000. Is that good?

[@Viper81766]

Great video. Can a bad PCV Valve cause a rich running condition ? Thank you

[@ScannerDanner]

I would say no, unless the oil is fuel contaminated.

[@Viper81766]

Thanks brother. I changed the oil after I had a coil misfire and replaced the coils and plugs. I am still getting rich post cat 02s on both sides. Did a injector balance test and they are all good dropping from 45 down to 22 on all 8 cylinders. Have 39 to 45psi fuel pressure at idle and have all four cats new, Walker, as the Ford cats were $2500 dollars for all four. Put all four Motorcraft 02s also. Has me stumped.

[@ScannerDanner]

Rich O2s downstream of the cat is normal bro. The converter catches and stores oxygen.

[@Viper81766]

OK. See, I learn more from you then I do the College I attend. Thanks again

[@therealest1245]

awesome vid very informative. thanks

[@JPsLawn]

i got a 03 2.3 ranger with a po171 code i got new plugs wires and coil pack.. the stupid plug in the front of the intake manifold popped out and i jb welded it back in ..got rid of the other codes but cant get rid of the po171 code... fuel pressure is 65 steady vacuum is 20 steady... but still idles alittle rough and throws the code runs fine other than that...please help

[@robbyjones7631]

POORBOYCUSTOMS Don't JB weld it. Install a Save- A-Thread kit. If you have enough room for the swaging tool, it'll work. If you need to remove lifters, get the special Ford tool called a Tappet collapse. Get the piston at TDC and both valves closed. Depress the lifter and remove the rocker arm. Crank the engine with plugs out to pump up the lifters.

[@TheRick2130]

hey paul, we have 99' chevy silverado with high idle trouble code, the complaint is stalling at dead stop. So they change the IAC already but its still no change even you unplug the connector. its strange because the desired rpm is 700 but the tachometer is reading 540 rpm is it possible to have vacuum leak or egr problem on this one. THANKS

[@stuartracing1]

What about an 01 GMQ that is slow to come down to idle when coming to a stop..It eventually drops to idle after about 15 seconds. I do have the PO1000 code after clearing a coil code...I unplugged the IAC while running and no change in rpm..I spayed carb cleaner around to find any vac. leaks and none found..Cleaned PCVvalve... Aggravated...

[@ScannerDanner]

On GM stepper type IAC valves, the RPM will NOT drop when you unplug the IAC, like in this video (solenoid type). The stepper motors hold their position when electrically unplugged. The next step is to determine what the IAC command is. My money is on a vacuum leak based on your description, but without knowing the year, make, model and engine size and whether or not it is a MAP or MAF engine would be super helpful for me to be able to answer better

[@stuartracing1]

@@ScannerDanner Sorry,GMQ means Grand Marquis.. 01 mercury Grand Marquis,LSE...4.6.SCT handheld programmer w/tune by Mo`s performance..It`s just so slow to come back to idle...It`s a MAF intake..I drove with my SCT plugged in to see what the IAC was doing and it would go more % as I gave it gas,and slowing went down to like 30% at stop lights..Since my last post I replced my IAC,but I haven`t cranked it yet...It`s like 100 degree`s outside...But I`ll post whats up..

[@stuartracing1]

Well,After installing a new(I had a life time warranty on the old one) IAC everything is back to awesome...I guess they only last 5 years..Thats when I bought the last one...Thanks for all the tips...

[@ScannerDanner]

@@stuartracing1 Thanks for watching! Tell your friends :-)

[@belizebreeze2001]

I have a 1987 f150 when I I pulled my it shut off what does that mean?

[@bayouredneck9456]

I have an 89 ford bronco 4.9l The truck has been restored but with all new parts it's still surging at idle when I unplug the IAC valve it kills the engine, any ideas

[@ScannerDanner]

what is your MAP frequency reading with the key on engine off (KOEO) and key on engine run at idle? You can use a DMM with a HZ scale to read it

[@mcchriswilliams1]

Hey Danny I have a 2001 ford taurus with high idle speed there is no codes it will idle fine until you move the throttle even just a little bit and it will jump to 2,000 for about 10 second there's no vacuum leaks tps iac both replace and pcm replace and reprogrammed any ideas will be helpful thanks

[@Texan1048]

+Chris Williams I recently installed a BWD IAC from an auto parts store. It looked identical to the original, except it had a spring behind the piston that my motorcraft one did not. It resulted in idle speeds up to 2-3000 rpms for up to 10 seconds before going back down to where it should be. Car ended up dying on me down the road because of that POS. Toss it out and buy the expensive motorcraft one. It costs more for a reason, clearly.

[@neilouellette3004]

Some comments below people will clean the idle air control valve. If you already are taking it off to clean, just buy a new one on EBAY for as little as $30. Your already taking it off and buying cleaner and new gasket.

[@ScannerDanner]

Cleaning these has never been a long term fix in my experience.

[@robbyjones7631]

Neil Ouellette Yes, cleaning is temporary. Clean the inside of the valve pocket. Use a code tester live test to watch the valve operation.