Thanks for the video. My 95 Dodge Ram was doing exactly what you described, and when I removed the electrical from the IAC, cleaned the contacts, and put it back, she runs perfectly now. Your video saved me a lot of time and money. Cheers!
I really appreciate your time brother,because of your video a got my truck fixed. and for the people that has a chevy 92 to 96 the iacv is located right under the air filter cover on passanger side,it look like a big bolt sticking in on the throttle wall with a conector on the end .hope i help somebody!!
Informative vid. I just cleaned the throttle butterfly on my 97 explorer but it didn't really help the rough idle situation. I checked out the IAC and discovered that its gasket was missing and the solenoid was very stiff; pretty much stuck. Here's hoping the new IAC fixes it.
Man the diagnosis was spot on.. engine stumbles in drive or reverse, revs high in neutral, and when it stumbles it stalls out when it's cold. Too bad IAC for my car runs $200, and the junk yard is bone dry.
i have a 89 sierra it seems like everything you said is whats happening to my truck, other then i cant keep it idling when its cold it runs and idles a lot better when its warmed up would that make a difference ive put new wires plugs rotors, everything on the truck just not sure why i know your busy answerin all these questions but if you get a minute let me know thx
Most of the time you can just clean it. I did mine yesterday, it was caked with about a 1/8 inch thick layer of black crud. Clean it with some throttle body cleaner and a toothbrush. And if your IAC is dirty, your throttle body is dirty too. Take the whole throttle body off and clean it up the same way. Make a HUGE difference on my 5.2 V8 in my Jeep Grand Cherokee.
Hey Timmy I have a 96 tacoma that dies only when I turn headlights on or ac on a cold start only. When its warm up it runs okay do you think I should clean my iac or just replace it? Also the plug you took off was the tps im guessing?
I got the same model truck 3.9 Dakota 2001 having this problem for almost 10 years now!!! It woks fine every time I change new AIC but a week later goes bad again, any ideas?
@nicawarrior1 Cleaning the throttle body will help because I did it and saw a difference. When I accelerate the pedal is fine but once I reach over 30mph it kind of sticks because it stays idled and I literally have to make a complete stop for the idle to get back to normal. Another problem that I have is that when I reach up to 50+ mph and push the gas pedal all the way in the truck hesitates and shakes a bit and it does not respond quick. Does your truck have the same problem? Thanks.
I'm sure they can integrate something to charge the batteries while driving, they already do it on the Prius. When the wheels are moving while in motion, they charge the battery.
That's what seems to be wrong with my car. I have a 92' acura integra, stalls and turns off when i come to a stop. Gonna change it asap and go from there. Great video by the way.
thanks I have a jeep wrangler I just cleaned the IAC on it but its still idling bad and tends to to shut off when changing gears . I think im gonna buy a new one . Do you recommend PEP BOYS ?
On my 92; I cleaned the entire throttle body including the IAC and the motor stopped stumbling when I would put it in anything other than P or N. Some good ol' TB cleaner and a toothbrush is all you need.
Just bought a new to me 95 with the v10. It does this even without changing gears. Like in a drive thru, sometimes it almost dies while idling down. My rpm guage does exactly what yours does without messing with the steering wheel, or ac.
Hello and thank you for the video. My car, a honda civic mk8 has a problem when I disengage the manual gear meaning that the rpm drops for a second below the nominal value of 750rpm. It only happens when lights are on or ac is on.I suspect it is the idle air control valve that needs to be cleaned but not sure about that. I would be thankfully if you could reply with your opinion based on the information I provided above.
@nicawarrior1 hey I took my whole throttle body out and cleaned the hell out of it and replaced the IAC. Cleaned out the mass air flow sensor and connections that go to it too. Now it runs really good and have a quick responce when I gas gas it and no check engine light. Good luck
@Nachona2700 thanks.. ill also be replacing the idle control sensor and a good cleaning of the throttle body to see if it helps.. dose your car also have a sticky pedal for example when a i reach a certain speedy it takes forever to decelerate.. it almost like cruise control??
Remove the 4-wire connector for the IAC. Attach a test light to battery ground. Start the engine, probe the four circuits while revving the engine up and down. The test light should blink on all four circuits. If it does, attach the test light to battery positive and recheck each circuit again. Once again the test light should blink on and off on all four circuits. If one or more circuits are not blinking, the wiring or the PCM is at fault.
Turn the radio on = affects idle speed. Listen to me people. This is exactly why ICE engine are passe. Get rid of your carbon spewing, petroleum engines. You can UA-cam the Tesla Model S. Its here now. Thank God.
Great vid tks for posting, I have a 1998 Dodge Ram 4x4 360, that I'm making into a war machine. Mine runs great but idles real low cuts off, I'll clean that little idle control deal, tks for posting.
Put the gas peddle to the floor and start it. If it fires up (It will run like crap for a minute) it IS the IAC that needs to be replaced.The can seem to work fine for a few days or intermittent. It all depends on the temperature and how much you drive it. It doesn't matter if a vehicle is fuel injected it WILL start when you put your foot to the floor (It's a urban legend you will cause damage cause it's fuel injected)
I have a 2000 eclipse and when the engine is cold I have to add gas until the engine is hit because its idols like crazy that causes it to stall. I'm getting a new IAC valve put in it this week. I just put a brand new engine and got a brand new intake. I'm hoping that the IAC is all that I need from it to stop idoling and stalling. Any idea are thankful.
Hello, and thank you for this video. My vehicle sounds a lot like yours after you disconnected the IAC. I am still troubleshooting and not sure if that's the problem or if it is the TCP or MAP. I was wondering how you cleaned the IAC valve?
bought my boy a 2002 dakota and all the sudden when he starts it after its been sitting awhile it idles very rough, like skipping kinda like it wants to stall, after it running for 2 or 3 minutes its smooth out and is fine, it only does it when it first started, is this similar to what yours was doing?? any thoughts or help from any one would be great.
THANK YOU!!! THATS EXACTLY WAT WAS HAPPENING TO ME WHEN I TURNED ON THE A/C IT WOULD STALL OR REVERSE WITH THE A/C ON IT WOULD STALL. I CLEANED IT AND IT WORKES GREAT!!
Yes, the entire intake was cleaned thoroughly this summer and made no difference. Right now I'm having the fuel pressure tested, if it's good, I'll know it's the IAC and potentially the TPS as well, I'll replace both.
ok so i gotta ? and im not being a smartass but my 95 jeep is doing the same thing but when i drop it in reverse it shuts down and i all ready changed the iac valve and i have the 5.2 v8 so if you find this problem plz let me know cuz you would be doing allot of jeep guys a big fav
I have a mustang 93 with the 2.3L 4cyl, and I'm having a very similar problem. The idle is so low when I come to a complete stop it tends to completely stall out. The only trick to force the engine to stay on that I know of is to quickly pop it out of gear, and rev it in neutral while the car is stopped (red lights i.e.) and once it finally warms up it still rattles, with a low idle but the car doesn't stall out anymore. Also the battery power drops when I hit the lights, and sometimes stalls.
Good demo, I currently have the same issue on my Jeep Grand Cherokee. Annoying idle issues too low with intermittent stalls and now too high of an idle around 1200 rpm.
My 96 Thunderbird hesitates or acts like it doesn't want to go when Im idling for a while at a stop light. I just replaced the Air Intake Controle Valve that was the cause of a fog horn like sound from my engine that i had for 4 months. Is the IAC the cause of my problem now?
My '97 dogde Dakota was doing the same thing. I tried doing what you said with my IAC and it fixed my truck for one day then started acting up again. My check engine light has never come on and it has been doing this for a week now. I took it to a mechanic and they couldn't even find the problem
I have a 1986 Cutlass Ciera with the 2.5 4 cylinder Iron Duke Engine. Last night it really gave me a hard time! "Service Engine Soon" light came on and every time I slowed down or took my foot off the gas, it would stall. Also, when I shift from park to drive, the idle goes right down and stalls. At red lights, the engine vibrates erratically. Some of these are also signs of IGNITION COIL failure, but the IAC is original, so it probably needs to be replaced a swell. Oxygen Sensor failure can also cause some of these symptoms I listed above.
I have an 83 firebird with crossfire injection. basically two throttle bodies. I hear they put the 4 cylinder iron duke throttle bodies on it :P I set my car to the correct ignition timing and it wants to stall and idle low. It was way advanced to compensate for this before hand. I wonder if the IAC is working? I need to figure out how to set minimum air and synchronize on both of these units.
some comments here sound similar to my problem..my ford f150 when on low rpms has a real lousy idle..feels like it will stall but never does..truck runs great otherwise..what are your thoughts?
I have a 1998 Chevy S10 v6 4.3L. engine and it has a P0507 code "Idle air control system RPM higher than expected" and it has a high idle when reached over 30mph. When I come to a complete stop then it seems to go back to normal rpm. When I start the truck before I put it in gear it has a high rpm too. Can it be the Idle air control valve that's going bad? Thank you.
My 96 5.2 does the same thing and it has gotten progressively worse. All my ASE Master Mechanic friends tell me the IAC just needs to be cleaned which I have done many times with no change. I just ordered a replacement so we shall see.
I think mines bad maybe something else but could this cause car to not start after driven for a while? Could it cause throttle body to erupt smoke out of nowhere? whait if spring is filthy looking? like gasoline is getting all in it? Car dies when changing to anything other than park and neutral. and sounds like your truck did but constantly going down more. Steering wheel kills car heat and a/c kills it. Radio doesnt but subwoofers do.
I have a chevy suburban 1989 with the 350 tbi...and it is backfiring but is also showing the exact same characteristics that you were demonstrating...could this cause backfiring as well?
Do you know why your dakota's trans light is on? Mine suddenly came on 4 months ago. It's got all the fluids. I know I have an oil leak but it's had that before the light came on. Any ideas?
Will it cause the motor to shut off when in idle with the ac and radio on if it's going bad? My ram will not start when it sits overnight. I have to take the air filter off than it starts right up and it will start rest of the day. Been occasions when running the ac and radio it will just shut off.
hi..if you notice that engine light.. ITS ON WHILE YOUR DOINg your test or what ever..IF YOU USE ENGINE SCAN CODE THAT WILL TELL YOU WHAT U NEED TO FIX.....
hi i have a question i have a 98 dakota slt 3.9L when im driving and stop for some reason and u put the truck in Parking or Neutral my truck some times turn off or it sounds like its going to turn itself off,and i saw ur video and i dnot know if i have to replace the IAC valve. i hope you can help me thanks so much!!!
I have a 5.9 Limited Jeep and the same problem, started with engine idle going nuts to now I start it and stalls, just undriveable. Haven't got to it yet but I'm told by a couple mechanics that my O2 sensor ( Oxygen sensor ) will do that. if 5.2 is same as 5.9, there's ( 2 ) O2 sensors, 1 in front and one in back of catalyst converter. Also told by 1 to take my convertor out and straight pipe it, and another one told me NOT to do it, truck will not run properly, will run too rich or too lean.
I drive a 90celica that use the EFI. Mine would sometime stall when I make a turn but hardly it does that. Sometime when the car is fully warm and shut off the car and turn it back on, it would have a low RPM, below 500. Also the idle screw adjuster is all the way close to the right already. If I turn it to give more RPM, my rpm gauge would pass 1k rpm so I have to close the idle adjuster to stay below 800. I have replaced two IAC already. Still the same but use parts. Guess I need to buy it new
Yea, if only George Bush had one tenth of the intelligence of this guy! Thanks for a great video. Don't forget to disconnect negative battery post for 30 minutes to reset ECM, then drive at least 40 mph to rest IAC. One symptom of bad IAC may be that when you are stopping your brake rotors will feel as if they are out of round, this is caused by the bad IAC pulsating at low rpm. Also, at idle speed your engine may feel as if a plug is misfiring.
Hey thanks for making this video! This might be the problem with my 96 Dodge Dakota. I guess it's either the IAC valve or maybe the fuel filter. I hope it is the IAC valve because on my truck the fuel filter sits on top of the gas tank and it's a pain to get to!
Hey I have a dodge Dakota 2 I need to know if urs is fuel injection or carburetor cuz I wanna change that thing in my carburetor is Like a big plate with a circle air filter so I want to put a differ air filter like yours or like sport filter So I want to u to put some videos of ur air kit and carburetor Well I hope u understand me and u kan help me Thnks
Clean the throttle body with Throttle body cleaner and scrub it good with a brush. After you reassemble and start the motor it will run like garbage and want to sputter. Just feather the throttle to keep it running till it burns all the cleaner off. If you still have issues with idle, you either have a bad IAC or TPS (throttle position sensor). Any garage can quickly test the TPS for you.
Its not a throttle body its SEFI. An easy way to tell is that the filter would be in that circular part like a carburetor. The last vehicle to have a throttlebody was the 1994 Chevy trucks
AIC is not the problem,i used to have a dodge dakota since i spent lots of money in parts never got it fixed.the problem was the PCM.I had similar issues.good luck if you still have it.
alex jahui what's the "PCM"? 😩🎀 I'm having the same problem, hard start shaking rough idle and low rpm's almost boggs out like it wants to die when I put it in Reverse. Even worse when it's cold so I have to let it warm up for like 10 minutes at least.
i have a 2002 F150 4WD. when im driving the truck feels like its misfiring. its jolts for a couple minutes then goes away. its does that when its idling too. i replaced the spark plugs and wires. help.
Thanks Timmy, now my scanner is showing the same code but it also tells me that the ECT sensor (or the CHT sensor) has failed, I'd like to know where is located. my car is a Grand Marquis 1996 (different to the car you show in this video)
Gave me a good idea where to start testing.. I'm having this problem, I think its a break in the wire.. I have a parts car.. put the IAC in car still same result, my next test is to unplug it and I suspect no difference. But it could be anything, possibly a vacuum leak.. But every test comes closer to the solution. But yeah, my Sunfire does the same thing, its okay at cold idle, but once it warms up it gets sloppy, and then put it into gear ir under load it can't take it and boggs out.
Did you find the source of the problem? What you said about your sunfire is exactly the problem I've been having. I've been looking around for weeks trying to narrow down what it could be.
actually buddy, an "idle air control valve" controls how much air goes into an engine at its idle, which some vehicles theres a breather hole for the valve to get a direct flow for the idle.
I have a 98 camaro and yesterday I noticed my car for the first time accelerated over and over while it was in park right after I put in gas. The car was on and in park going "Vroom, vroom, vroom, vroom" and I was not pushing on the gas at all. Now today I woke up and went to start my car and it will crank over but won't start. Any idea what that could be?? No one can figure it out yet...
My 86 Camaro with a 2.8L V6 idles rough when it is warmed up. runs mint when it's cold though. could that be the IAC valve on my throttle body? or something else?
@Nachona2700 i just recently cleaned my iac and throttle body and i see an improvement but i still have the same problem to a lesser extend. i was hoping that it will clear the P0507 code (Idle air control system RPM higher than expected) but it didn't. so i'll be changing the IAC and hoping to find a cheap one online.
This was happening a few months back. Two days ago is started again. Really crappy if this part was a defect and it failed on me within months. I wonder what other part mimics these symptoms
There's no check engine light and no misfiring ... We think I might be a vac leak but were not sure. Someone told us the o2 sensors. Well find out soon enough we just bought a flowmaster super 44 system with headers
***** i have fluctuating rpm at idol low rpm as well motor also runs really rough will kinda sout and putter hesitation when driving almost acts as if its missing but when in idol it seems fine just my rpm jumps around i get an intermittent check engine for random misfire.
I appreciate your attempt to explain/describe/show noobs [like I] how to do this. It may help if you change the description to the make and model you are working on as well. Thank you for your time :) Good video!
Im here to help you and others and not to discredit, but your thining is wrong here on the functions. The IAC lo located on the bac of the throttle body has only one purpose and that is to cause higher engine RPM when the engine is started cold. It is the TPS throttle position sensor that raises your idle when AC is on which is located on the right side of the throttle body. The IAC is totally dormant after engine is warm and is simply an electronic choke. Here is in explaination the only function of your IAC, and you start engine cold and it revs and remains at about 1100 RPM for about 30 seconds and then drops down to about 700 RPM and after this function DOES NOTHING, and the TPS regulate the idle speed from when you turn your steering and run your AC and shift from neutral to a gear.
@nicawarrior1 I took out the idle air control sensor and it was full of gunk, tried cleaning it out but problem is still there. I'm thinking of just replacing it with in the next week or two.
i have a 1988 s10 blazer with a 4.3 in it i replaced the map sensor and the tps sensor and the iac valve.when u put it in park it has high idel it idel at 2500 rpm plz help thanks
i have fluctuating rpm at idol low rpm as well motor also runs really rough will kinda sput and putter hesitation when driving almost acts as if its missing but when in idol it seems fine just my rpm jumps around i get an intermittent check engine for random misfire.
no i didnt replace it i just now today disconnected it and the rpm started jumping way up i have a low rmp issue and the sluggish noise it makes when revving was still there so its something else i have that spider injector thing that i think was a known issue in this model a 98 tahoe witha vortec motor ill look i dont see anythin obvisly wrong maybe my plugs arnt gaped right
i dont have to worry about the issue anymore it was my iac engine light came on for that but few days later i got into a major wreck the jeep is totaled good thing is im okay i am now looking for a new car.
The "vroom vroom vroom" while being idle is 100% an Idle Air Control System problem. more than likely the Valve. the not starting problem could be related or could be a number of things.
Thanks for the video. My 95 Dodge Ram was doing exactly what you described, and when I removed the electrical from the IAC, cleaned the contacts, and put it back, she runs perfectly now. Your video saved me a lot of time and money. Cheers!
Hi my 1995 dodge ram is doing the same thing after 26 years it decided to iac to stop working it was an original part
I really appreciate your time brother,because of your video a got my truck fixed.
and for the people that has a chevy 92 to 96 the iacv is located right under the air filter cover on passanger side,it look like a big bolt sticking in on the throttle wall with a conector on the end .hope i help somebody!!
Informative vid. I just cleaned the throttle butterfly on my 97 explorer but it didn't really help the rough idle situation. I checked out the IAC and discovered that its gasket was missing and the solenoid was very stiff; pretty much stuck. Here's hoping the new IAC fixes it.
Man the diagnosis was spot on.. engine stumbles in drive or reverse, revs high in neutral, and when it stumbles it stalls out when it's cold. Too bad IAC for my car runs $200, and the junk yard is bone dry.
Sounds like we are being taught by George W. Bush.
Jason K, xxx
"Make no mistake about it"
LOL!!!!!!
i.imgur.com/Ghs6jj9.jpg
Busch can't teach you anything.lol
I thought that too!
I thought the same ! Lol
i have a 89 sierra it seems like everything you said is whats happening to my truck, other then i cant keep it idling when its cold it runs and idles a lot better when its warmed up would that make a difference ive put new wires plugs rotors, everything on the truck just not sure why i know your busy answerin all these questions but if you get a minute let me know thx
Very good explanation.i seen alot of folks posting videos. Saying how to change it but they don't explain the syngtoms .thanks 👏
my 2001 dodge Dakota is doing just that. thank you for making video and showing how to check the IAC valve. I will try cleaning or buy new one.
Most of the time you can just clean it. I did mine yesterday, it was caked with about a 1/8 inch thick layer of black crud. Clean it with some throttle body cleaner and a toothbrush. And if your IAC is dirty, your throttle body is dirty too. Take the whole throttle body off and clean it up the same way. Make a HUGE difference on my 5.2 V8 in my Jeep Grand Cherokee.
Hey Timmy I have a 96 tacoma that dies only when I turn headlights on or ac on a cold start only. When its warm up it runs okay do you think I should clean my iac or just replace it? Also the plug you took off was the tps im guessing?
your diagnosis was exactly right. same thing was wrong with my ram. thanks for the video, helped alot.
I got the same model truck 3.9 Dakota 2001 having this problem for almost 10 years now!!! It woks fine every time I change new AIC but a week later goes bad again, any ideas?
@nicawarrior1 Cleaning the throttle body will help because I did it and saw a difference. When I accelerate the pedal is fine but once I reach over 30mph it kind of sticks because it stays idled and I literally have to make a complete stop for the idle to get back to normal. Another problem that I have is that when I reach up to 50+ mph and push the gas pedal all the way in the truck hesitates and shakes a bit and it does not respond quick. Does your truck have the same problem? Thanks.
I'm sure they can integrate something to charge the batteries while driving, they already do it on the Prius. When the wheels are moving while in motion, they charge the battery.
That's what seems to be wrong with my car. I have a 92' acura integra, stalls and turns off when i come to a stop. Gonna change it asap and go from there. Great video by the way.
thanks I have a jeep wrangler I just cleaned the IAC on it but its still idling bad and tends to to shut off when changing gears . I think im gonna buy a new one . Do you recommend PEP BOYS ?
check out my video I had the same issue I clean the idle air control valve however I also clean my mass airflow sensor
On my 92; I cleaned the entire throttle body including the IAC and the motor stopped stumbling when I would put it in anything other than P or N. Some good ol' TB cleaner and a toothbrush is all you need.
Just bought a new to me 95 with the v10. It does this even without changing gears. Like in a drive thru, sometimes it almost dies while idling down. My rpm guage does exactly what yours does without messing with the steering wheel, or ac.
Thx for this vid I now know what causes the drop in RPM when shifting from park.
Hello and thank you for the video. My car, a honda civic mk8 has a problem when I disengage the manual gear meaning that the rpm drops for a second below the nominal value of 750rpm. It only happens when lights are on or ac is on.I suspect it is the idle air control valve that needs to be cleaned but not sure about that. I would be thankfully if you could reply with your opinion based on the information I provided above.
@nicawarrior1 hey I took my whole throttle body out and cleaned the hell out of it and replaced the IAC. Cleaned out the mass air flow sensor and connections that go to it too. Now it runs really good and have a quick responce when I gas gas it and no check engine light. Good luck
@Nachona2700 thanks.. ill also be replacing the idle control sensor and a good cleaning of the throttle body to see if it helps.. dose your car also have a sticky pedal for example when a i reach a certain speedy it takes forever to decelerate.. it almost like cruise control??
Backfiring can also be caused by a lean fuel mixture or low KV output from the ignition coil.
Remove the 4-wire connector for the IAC. Attach a test light to battery ground. Start the engine, probe the four circuits while revving the engine up and down. The test light should blink on all four circuits. If it does, attach the test light to battery positive and recheck each circuit again. Once again the test light should blink on and off on all four circuits. If one or more circuits are not blinking, the wiring or the PCM is at fault.
Turn the radio on = affects idle speed. Listen to me people. This is exactly why ICE engine are passe. Get rid of your carbon spewing, petroleum engines. You can UA-cam the Tesla Model S. Its here now. Thank God.
Great vid tks for posting, I have a 1998 Dodge Ram 4x4 360, that I'm making into a war machine. Mine runs great but idles real low cuts off, I'll clean that little idle control deal, tks for posting.
Put the gas peddle to the floor and start it. If it fires up (It will run like crap for a minute) it IS the IAC that needs to be replaced.The can seem to work fine for a few days or intermittent. It all depends on the temperature and how much you drive it.
It doesn't matter if a vehicle is fuel injected it WILL start when you put your foot to the floor (It's a urban legend you will cause damage cause it's fuel injected)
I have a 2000 eclipse and when the engine is cold I have to add gas until the engine is hit because its idols like crazy that causes it to stall. I'm getting a new IAC valve put in it this week. I just put a brand new engine and got a brand new intake. I'm hoping that the IAC is all that I need from it to stop idoling and stalling. Any idea are thankful.
Hello, and thank you for this video. My vehicle sounds a lot like yours after you disconnected the IAC. I am still troubleshooting and not sure if that's the problem or if it is the TCP or MAP. I was wondering how you cleaned the IAC valve?
bought my boy a 2002 dakota and all the sudden when he starts it after its been sitting awhile it idles very rough, like skipping kinda like it wants to stall, after it running for 2 or 3 minutes its smooth out and is fine, it only does it when it first started, is this similar to what yours was doing?? any thoughts or help from any one would be great.
THANK YOU!!! THATS EXACTLY WAT WAS HAPPENING TO ME WHEN I TURNED ON THE A/C IT WOULD STALL OR REVERSE WITH THE A/C ON IT WOULD STALL. I CLEANED IT AND IT WORKES GREAT!!
With mine it does the opposite
Yes, the entire intake was cleaned thoroughly this summer and made no difference. Right now I'm having the fuel pressure tested, if it's good, I'll know it's the IAC and potentially the TPS as well, I'll replace both.
ok so i gotta ? and im not being a smartass but my 95 jeep is doing the same thing but when i drop it in reverse it shuts down and i all ready changed the iac valve and i have the 5.2 v8 so if you find this problem plz let me know cuz you would be doing allot of jeep guys a big fav
it will cause a vehicle to stop running as soon as you let off the gas, or to idle way to high consistently.
I have a mustang 93 with the 2.3L 4cyl, and I'm having a very similar problem. The idle is so low when I come to a complete stop it tends to completely stall out. The only trick to force the engine to stay on that I know of is to quickly pop it out of gear, and rev it in neutral while the car is stopped (red lights i.e.) and once it finally warms up it still rattles, with a low idle but the car doesn't stall out anymore. Also the battery power drops when I hit the lights, and sometimes stalls.
I need help timing my 2000 Dodge Dakota Sport 3.9 L the Cadillac converters are turning red and it backfires
in my case it does stumble and stall in park. can this till be ICV? it runs fine when i start to push the pedal.
Good demo, I currently have the same issue on my Jeep Grand Cherokee. Annoying idle issues too low with intermittent stalls and now too high of an idle around 1200 rpm.
My 96 Thunderbird hesitates or acts like it doesn't want to go when Im idling for a while at a stop light. I just replaced the Air Intake Controle Valve that was the cause of a fog horn like sound from my engine that i had for 4 months. Is the IAC the cause of my problem now?
Would a bad IAC cause the car to lurch a little when your hitting the gas?
My '97 dogde Dakota was doing the same thing. I tried doing what you said with my IAC and it fixed my truck for one day then started acting up again. My check engine light has never come on and it has been doing this for a week now. I took it to a mechanic and they couldn't even find the problem
Did you find a solution?
I have a 1986 Cutlass Ciera with the 2.5 4 cylinder Iron Duke Engine. Last night it really gave me a hard time! "Service Engine Soon" light came on and every time I slowed down or took my foot off the gas, it would stall. Also, when I shift from park to drive, the idle goes right down and stalls. At red lights, the engine vibrates erratically. Some of these are also signs of IGNITION COIL failure, but the IAC is original, so it probably needs to be replaced a swell. Oxygen Sensor failure can also cause some of these symptoms I listed above.
I have an 83 firebird with crossfire injection. basically two throttle bodies. I hear they put the 4 cylinder iron duke throttle bodies on it :P I set my car to the correct ignition timing and it wants to stall and idle low. It was way advanced to compensate for this before hand. I wonder if the IAC is working? I need to figure out how to set minimum air and synchronize on both of these units.
Seth Williams my Lumina does that. even after I put a new IAC valve in.
some comments here sound similar to my problem..my ford f150 when on low rpms has a real lousy idle..feels like it will stall but never does..truck runs great otherwise..what are your thoughts?
This is really helpful but is there a way to test the IAC? I have a Ford Ranger 2.3, 2cy and we're having the same issue.
I have a 1998 Chevy S10 v6 4.3L. engine and it has a P0507 code "Idle air control system RPM higher than expected" and it has a high idle when reached over 30mph. When I come to a complete stop then it seems to go back to normal rpm. When I start the truck before I put it in gear it has a high rpm too. Can it be the Idle air control valve that's going bad? Thank you.
My 96 5.2 does the same thing and it has gotten progressively worse. All my ASE Master Mechanic friends tell me the IAC just needs to be cleaned which I have done many times with no change. I just ordered a replacement so we shall see.
Did it work
my car's been doing that! and I had no idea what it was!!!! thank you so much! I'm gonna check it out now!
I think mines bad maybe something else but could this cause car to not start after driven for a while? Could it cause throttle body to erupt smoke out of nowhere? whait if spring is filthy looking? like gasoline is getting all in it? Car dies when changing to anything other than park and neutral. and sounds like your truck did but constantly going down more. Steering wheel kills car heat and a/c kills it. Radio doesnt but subwoofers do.
I have a chevy suburban 1989 with the 350 tbi...and it is backfiring but is also showing the exact same characteristics that you were demonstrating...could this cause backfiring as well?
Do you know why your dakota's trans light is on? Mine suddenly came on 4 months ago. It's got all the fluids. I know I have an oil leak but it's had that before the light came on. Any ideas?
Ay man, thanx for spending the time to educate us on this bro. Been having some issues with my Cadi and this particular part. Much appreciated
Hey dude, thanks for the video. Saved me a lot from taking to a mechanic. You awesome!!
that sucking sound.... i bout died when you said that
Does this have any affect of shifting with automatic transmissions?
@Nachona2700 hey my 2002 chevy blazer with the same 4.3L v6 has the same issue. Did you find out what the exact problem was -thanks
Will it cause the motor to shut off when in idle with the ac and radio on if it's going bad? My ram will not start when it sits overnight. I have to take the air filter off than it starts right up and it will start rest of the day. Been occasions when running the ac and radio it will just shut off.
Was this the problem my car stalls when putting ac on only on cold start
hi..if you notice that engine light.. ITS ON WHILE YOUR DOINg your test or what ever..IF YOU USE ENGINE SCAN CODE THAT WILL TELL YOU WHAT U NEED TO FIX.....
Leaving the air cleaner off to diagnose problems is a problem. Unfortunate as it is, you have to put it back on.
Why? There is no upstream MAF sensor nor even a air temperature sensor. So aside from extra noise there is no effect.
hi i have a question i have a 98 dakota slt 3.9L when im driving and stop for some reason and u put the truck in Parking or Neutral my truck some times turn off or it sounds like its going to turn itself off,and i saw ur video and i dnot know if i have to replace the IAC valve. i hope you can help me thanks so much!!!
I have a 5.9 Limited Jeep and the same problem, started with engine idle going nuts to now I start it and stalls, just undriveable. Haven't got to it yet but I'm told by a couple mechanics that my O2 sensor ( Oxygen sensor ) will do that. if 5.2 is same as 5.9, there's ( 2 ) O2 sensors, 1 in front and one in back of catalyst converter. Also told by 1 to take my convertor out and straight pipe it, and another one told me NOT to do it, truck will not run properly, will run too rich or too lean.
I drive a 90celica that use the EFI. Mine would sometime stall when I make a turn but hardly it does that. Sometime when the car is fully warm and shut off the car and turn it back on, it would have a low RPM, below 500. Also the idle screw adjuster is all the way close to the right already. If I turn it to give more RPM, my rpm gauge would pass 1k rpm so I have to close the idle adjuster to stay below 800. I have replaced two IAC already. Still the same but use parts. Guess I need to buy it new
Yea, if only George Bush had one tenth of the intelligence of this guy! Thanks for a great video. Don't forget to disconnect negative battery post for 30 minutes to reset ECM, then drive at least 40 mph to rest IAC. One symptom of bad IAC may be that when you are stopping your brake rotors will feel as if they are out of round, this is caused by the bad IAC pulsating at low rpm. Also, at idle speed your engine may feel as if a plug is misfiring.
Hey thanks for making this video! This might be the problem with my 96 Dodge Dakota. I guess it's either the IAC valve or maybe the fuel filter. I hope it is the IAC valve because on my truck the fuel filter sits on top of the gas tank and it's a pain to get to!
Hey I have a dodge Dakota 2
I need to know if urs is fuel injection or carburetor cuz I wanna change that thing in my carburetor is Like a big plate with a circle air filter so I want to put a differ air filter like yours or like sport filter
So I want to u to put some videos of ur air kit and carburetor
Well I hope u understand me and u kan help me
Thnks
'Causes the engine to rev up and down'
I think there's room for improvment there, since theres more going on than just that
screw these valves. just as idiotic as the old carb poppet valves. this is a great video to point others in the right direction!!
well, that confirms it..thanks man..I have a Ford Explorer that is 14 yr old and it is living up to the name Fix Or Replace Daily..haha
The issue I'm having is when I give it gas it doesn't rev up , what would cause that ? Thank you for your help .
Could be the throttle body not opening
Clean the throttle body with Throttle body cleaner and scrub it good with a brush. After you reassemble and start the motor it will run like garbage and want to sputter. Just feather the throttle to keep it running till it burns all the cleaner off.
If you still have issues with idle, you either have a bad IAC or TPS (throttle position sensor). Any garage can quickly test the TPS for you.
Its not a throttle body its SEFI. An easy way to tell is that the filter would be in that circular part like a carburetor. The last vehicle to have a throttlebody was the 1994 Chevy trucks
my 94 GMC idles high after replacing transmission, what could be wrong?
AIC is not the problem,i used to have a dodge dakota since i spent lots of money in parts never got it fixed.the problem was the PCM.I had similar issues.good luck if you still have it.
alex jahui what's the "PCM"? 😩🎀 I'm having the same problem, hard start shaking rough idle and low rpm's almost boggs out like it wants to die when I put it in Reverse. Even worse when it's cold so I have to let it warm up for like 10 minutes at least.
i have a 2002 F150 4WD. when im driving the truck feels like its misfiring. its jolts for a couple minutes then goes away. its does that when its idling too. i replaced the spark plugs and wires. help.
Thanks Timmy, now my scanner is showing the same code but it also tells me that the ECT sensor (or the CHT sensor) has failed, I'd like to know where is located.
my car is a Grand Marquis 1996 (different to the car you show in this video)
I have a chevy impala and it continuously idles high? I changed the TPS but same results... any suggestions? IAC maybe?
My grand cherokee has been having a shit load of trouble staying running at idle and stalls all the time is this my problem?
Gave me a good idea where to start testing.. I'm having this problem, I think its a break in the wire.. I have a parts car.. put the IAC in car still same result, my next test is to unplug it and I suspect no difference.
But it could be anything, possibly a vacuum leak..
But every test comes closer to the solution. But yeah, my Sunfire does the same thing, its okay at cold idle, but once it warms up it gets sloppy, and then put it into gear ir under load it can't take it and boggs out.
Did you find the source of the problem? What you said about your sunfire is exactly the problem I've been having. I've been looking around for weeks trying to narrow down what it could be.
actually buddy, an "idle air control valve" controls how much air goes into an engine at its idle, which some vehicles theres a breather hole for the valve to get a direct flow for the idle.
I couldn't get past 2 minutes...he doesn't have a clue.
But he knows what the throttle body is. That's about it. Musta said "there's your throttle body" 3 times...then uh...umm...uhh...
ive got a 4 barral eldlebrock carb where is mine or do only have plugs /???
I have a 98 camaro and yesterday I noticed my car for the first time accelerated over and over while it was in park right after I put in gas. The car was on and in park going "Vroom, vroom, vroom, vroom" and I was not pushing on the gas at all. Now today I woke up and went to start my car and it will crank over but won't start. Any idea what that could be?? No one can figure it out yet...
Will it idle normally once the engine has warmed up? The idle in mine fluctuates alot in the morning but once it warms up it idles normally.
My 86 Camaro with a 2.8L V6 idles rough when it is warmed up. runs mint when it's cold though. could that be the IAC valve on my throttle body? or something else?
@Nachona2700 i just recently cleaned my iac and throttle body and i see an improvement but i still have the same problem to a lesser extend. i was hoping that it will clear the P0507 code (Idle air control system RPM higher than expected) but it didn't. so i'll be changing the IAC and hoping to find a cheap one online.
Your the first person I have seen that has a AIC sensor.... I'm searching for a IAC thanks anyways bud. Jk thanks for the info bro!
Thanx for the video..almost changed out the wrong part
This was happening a few months back. Two days ago is started again. Really crappy if this part was a defect and it failed on me within months. I wonder what other part mimics these symptoms
what the heck does the radio have to do with it
Replace the AIC Valve and my truck is still doing the whole idle up and down and stall out thing when she starts up. Any ideas
There's no check engine light and no misfiring ... We think I might be a vac leak but were not sure. Someone told us the o2 sensors. Well find out soon enough we just bought a flowmaster super 44 system with headers
***** i have fluctuating rpm at idol low rpm as well motor also runs really rough will kinda sout and putter hesitation when driving almost acts as if its missing but when in idol it seems fine just my rpm jumps around i get an intermittent check engine for random misfire.
SuperJeremi10 just out of curiousness did you ever solve that problem???
I appreciate your attempt to explain/describe/show noobs [like I] how to do this. It may help if you change the description to the make and model you are working on as well. Thank you for your time :) Good video!
Will a IAC cause the vehicle to shut off when it is cranked
I have a Toyota Avalon it accelerates by its self and when I turn it on then off I need to wait 2 hours for it could start again??
You ever figure it out? My car is doing the same
I watch many of these videos, but none of them tell you that your suppose to disconnect battery while you change sensors right?
Lou Mndzbl because you don't have to.
Im here to help you and others and not to discredit, but your thining is wrong here on the functions. The IAC lo located on the bac of the throttle body has only one purpose and that is to cause higher engine RPM when the engine is started cold. It is the TPS throttle position sensor that raises your idle when AC is on which is located on the right side of the throttle body. The IAC is totally dormant after engine is warm and is simply an electronic choke. Here is in explaination the only function of your IAC, and you start engine cold and it revs and remains at about 1100 RPM for about 30 seconds and then drops down to about 700 RPM and after this function DOES NOTHING, and the TPS regulate the idle speed from when you turn your steering and run your AC and shift from neutral to a gear.
. j .kd
whats the check engine light on for? my 00 dakota is always coming on for a vac leak.
@nicawarrior1 I took out the idle air control sensor and it was full of gunk, tried cleaning it out but problem is still there. I'm thinking of just replacing it with in the next week or two.
Wow thanks changed my plugs wires throttle body to a holly nothing even did a sea foam treatment dodges have a problem with the iac
Yours may be due to a weak distributor shaft magnet, this will cause backfiring, high, low, or unstable idle speed!
i have a 1988 s10 blazer with a 4.3 in it i replaced the map sensor and the tps sensor and the iac valve.when u put it in park it has high idel it idel at 2500 rpm plz help thanks
i have fluctuating rpm at idol low rpm as well motor also runs really rough will kinda sput and putter hesitation when driving almost acts as if its missing but when in idol it seems fine just my rpm jumps around i get an intermittent check engine for random misfire.
no i didnt replace it i just now today disconnected it and the rpm started jumping way up i have a low rmp issue and the sluggish noise it makes when revving was still there so its something else i have that spider injector thing that i think was a known issue in this model a 98 tahoe witha vortec motor
ill look i dont see anythin obvisly wrong maybe my plugs arnt gaped right
+lahmamamia If you can even get to them with the airbox on
i dont have to worry about the issue anymore it was my iac engine light came on for that but few days later i got into a major wreck the jeep is totaled good thing is im okay i am now looking for a new car.
The "vroom vroom vroom" while being idle is 100% an Idle Air Control System problem. more than likely the Valve. the not starting problem could be related or could be a number of things.