Modern vehicles, such as those manufactured by Chevy, work in unison with computer modules within the engine compartment. An idle relearn procedure must be performed if a computer, or chip, is replaced in the vehicle. An idle relearn procedure is a way to reprogram the vehicle's computer memory to idle at a specified RPM, or revolutions per minute.
Without the programmed idle, the vehicle can run arbitrarily, resulting in unnecessary engine wear. Chevy uses a simple idle relearn process. After you replace the computer chip, it will automatically reset itself when you turn the ignition key from the "on" position to the "off" position.
Blue Streak Electronics recommends to warm the engine after the idle relearn procedure, without use of the air conditioner. After the engine is warm, switch the air conditioning on and off, and then put the transmission into the "drive" position. These actions complete the full idle relearn procedure. It is imperative that a technician verifies that the car's battery is fully charged. If power fails during a relearn procedure, the technician must reprogram the computer chip.
This article was written by the It Still Runs team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information. To submit your questions or ideas, or to simply learn more about It Still Runs, contact us. Considerations It is imperative that a technician verifies that the car's battery is fully charged.
About the Author This article was written by the It Still Runs team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information.There are quite a few reasons why your Hyundai Elantra could be idling rough.
An internal combustion engine needs air, fuel, and spark in order to achieve ignition. When one or more of these variables is off it can lead to a rough idling condition. Most of the time the culprit is going to be the ignition system, although there are a myriad of other causes. Hopefully, the check engine light is on. It can tell you a lot about what is going on with your Elantra.
You can either go to the local parts store and ask them to scan the vehicle for you, or you can do this yourself. Most of them will do that as a courtesy obviously they want to sell the parts. Alternatively, code scanners are pretty affordable. Having one of your own can save you a ton of time.
Here are the most common problems that would cause a Hyundai Elantra to idle rough:. Here are the main components of the ignition system, as well as what would cause them to make your Elantra idle roughly.
It could be so clogged that there is not enough air getting through for quality idle conditions. Of all the sensors equipped in your vehicle, the O2 sensors may have it the hardest.
They deal with super hot exhaust that can cover them in deposits that can leave them ineffective. If an oxygen sensor goes bad, it can make your Elantra run too lean or rich.
A super lean running engine will often idle rough. The fuel injection systems job is to atomize the fuel into fine mist. If a fuel injector has an issue with this process, it will either let too much or too little fuel into the combustion chamber relative to the amount of air.
There are many reasons why a fuel injector may go bad, as well as different symptoms relative to how they went bad. For more, check out Hyundai Elantra bad fuel injector symptoms. There are many reasons that your Hyundai Elantra may be idling rough. We tried to lay out the most common ones above. If there is anything else that you would like to add, please leave a comment below. Good luck!!
Here are the most common problems that would cause a Hyundai Elantra to idle rough: A fouled plug VS a brand new plug Ignition System Here are the main components of the ignition system, as well as what would cause them to make your Elantra idle roughly.
Although most modern vehicles use iridium spark plugs, they still need to be changed at the manufacturers recommended interval. This page has a great chart for you to compare your spark plug condition to new plugs. These packs are fired by the engines computer at exactly the right time to provide the optimal ignition timing. Really, your Elantra will be running rougher at any RPM, but a misfire will be most pronounced at idle. Fuel Injectors The fuel injection systems job is to atomize the fuel into fine mist.
Conclusion There are many reasons that your Hyundai Elantra may be idling rough.Congratulations on installing your brand-new Spectra Premium electronic throttle body. Sign up to receive our newsletter with valuable new tech articles and videos every month. Transcript: Congratulations on installing your brand-new Spectra Premium electronic throttle body. Firstly, check the vehicle for any pre-existing trouble codes and make the appropriate repairs.
Inspect the PCB system. Inspect the engine for any damaged hoses that could cause a vacuum leak. Special attention should be given to the PCV system, oil dipstick, and filler cap seals for damage. Disconnect the negative battery terminal for 30 seconds to reset the onboard computer. Do not perform the relearn if the service engine soon light is on and codes related to the mass airflow sensor, manifold absolute pressure, or incorrect idle speed are found.
If everything is in order, we can begin. Third, turn off all accessories such as the air conditioning, rear window defogger, radio, and heater blower to prevent a load on the engine which would cause erroneous positioning of the throttle plate. Finally, make sure the front wheels of the vehicle are in the neutral position pointing straight ahead. We are now ready to perform the required relearn procedure. Make sure the accelerator pedal is fully released. Turn the ignition switch on without starting the engine for at least 2 seconds.
Turn the ignition switch off for at least 10 seconds.
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Again, turn the ignition on for at least 2 seconds. Turn the ignition off for at least 10 seconds. This action will inform the computer on the new release position of the accelerator pedal and the closed position. Now that this is done, we can move on to the next step. Please make sure to follow these next instructions precisely as every action is performed within a few seconds. Turn the ignition switch on and wait 3 seconds.
Immediately after the 3 seconds, the accelerator pedal must be pressed and released 5 times within 5 seconds. Wait 7 seconds and fully press the accelerator pedal and hold for approximately 20 seconds until the check engine light stops blinking and stays on. Within 3 seconds after the check engine light stays constantly on, release the accelerator pedal. Now start the engine and let it idle. After 20 seconds, rev up the engine a couple of times to ensure idle speed is within specifications.
If the relearn was unsuccessful, turn the key to the off position wait 60 seconds and restart the process. Thank you for watching. For more instructional videos, please remember to subscribe to the channel. You can also follow us on Facebook and Twitter. They are like the nerve endings of the vehicle.
Related Information. Read More. Watch Video. Quality Brands. Send this to friend Your email Recipient email Send Cancel.Worried about potential repair costs?
An extended warranty can provide peace of mind. See our lemon odds and nada odds page to see vehicles with no repairs or vehicles with more than three repairs.
To see how frequently Hyundai Elantra problems occur, check out our car reliability stats. See most expensive repairs Worried about potential repair costs? Chart based on 32 repair trips. The repair cost chart excludes repairs made under warranty, do-it-yourself repairs, and repair trips that include maintenance. Apparently this is common in the elantra in colder climates.
In fact, it was fully powered, just would not react to the key being turned. I was able to get it started after about 15 tries. The dealer found nothing wrong! The ended up replacing the head gasket. This improved mpg but did not solve the rough idle. Car had a rough idle. A week after the prior visit oil change, with them also replacing the head gasketI took it back in but they could not reproduce the problem.
When driving the vehicle would not shift out of first in D. Switching to manual, I was able to shift when needed. When I went back and got the vehicle, the problem was gone. The next morning though, the issue came back.
The shop said that they updated the ECM and that solved the problem. It did not. The repair was unsuccessful. Replaced exhaust valve under TSB. Dealer found open service bulletin regarding this code and adjusted computer sensitivity. CEL reset. Problem was solved with fuel pump replacement.
I got an Altima whilst the Elantra was in for a bodywork repair and achieved The claimed mileage figures are a farce. Never had a problem with a cold start or a hot start the dealer was stumped but ultimatly replaced the fuel pump hoping that would solve the problem. Mechanic clamped it down. Completely replaced under warranty.
Dealer reinforced the pipe support with clamps.
Hyundai Elantra Rough Idle → Causes & Diagnosis
See TrueDelta's information for all Sedans and Coupes. See TrueDelta's information for all Hyundai models. Engine noise reported, diagnosed with piston slap, waiting for a replacement engine. Though the battery was weak and replaced a few days ago, the car did not start.In the event you are experiencing an erratic idle after loading a tune or after performing any action that clears KAM Keep Alive Memoryan Idle Relearn can help you get back on track.
This memory contains data regarding idle trims, fueling adjustments, adaptive shifting, and many other parameters. It is constantly updated as the vehicle is driven to account for changes in environment, driving conditions, and even wear on the vehicle.
Examples would be: disconnecting the battery, replacing battery or battery cables, a dead battery, or a bad ground. When KAM is cleared, or battery power is lost, the computer returns to the base parameters set in the calibration, and loses the stored values it has gathered based on driving habits, inputs, and data collected by the vehicle sensors.
When this happens it is sometimes necessary to perform an idle relearn to once again teach the car how to idle correctly. Account 0 Items.
Menu Links My Account. Follow these steps to complete an Idle Relearn: With vehicle at a complete stop, set the parking brake.Hyundai 2016 Elantra Engine Resetting Adaptive Value - 20160812
Put gear shifter in "P" Parkturn off all accessories. Run the engine until it reaches normal operating temperature. Allow engine to idle for at least one minute. Turn the air conditioning on and allow the engine to idle for at least one minute.
Release the parking brake. Drive the vehicle to complete the relearning process. Just make sure you drive easy for the first 30 miles, so the PCM can re-learn and adapt to your driving style.My Hyundai Elantra is a good car overall, but 1 year after purchase, I also started to have the car not starting up thing. It started with minor no starts, which would start on the 2nd or 3rd try.
Then as months went by, it started to get worse, sometimes requiring a 5 minute wait or more. The first time I took to the dealer, they couldn't find the issue.
The second time, they knew exactly what it was. I'm guessing I wasn't the only one complaining. Has been 2 years now and still good. It was covered under the standard warranty too. Hyundai stand by their products. I own a Hyundai Elantra which about every 3 days while sitting at a red light or waiting to pull out into traffic stalls for no apparent reason. I took the car to my auto mechanic who could find no reason for the problem. Have been trying to get a hold of the dealership service department to no avail.
This may turn into a serious problem should this happen and I end up in an accident because no one wants to figure this out. I also have had issues with it not wanting to start. If you have a for-profit service, contact us. Ask your Hyundai dealer. Most Common Solutions: not sure 1 reports replaced the range switch on the transmission 1 reports. Find something helpful? Spread the word.
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Not what you are looking for? Search for something else:.Automotive Forums. Under most circumstances, it will relearn after just driving the car for a while, but if your car continues to experience an abnormal idle, or you just don't want to wait for it to relearn on its own, you can try this procedure. While The negative cable is dissconnected, pump the brake pedal a few times to clear out any voltage in the system.
Re-connect the negative cable after this is complete. Turn off air conditioning controls and all other accessories. Allow engine to run for at least 5 minutes. With engine stabilized and in closed loop, the IAC motor values should be between nine to 12 counts.
If not, the adjustments may be tailored by adjusting the minimum air rate screw. More throttle valve opening equals lower IAC counts. Less throttle opening equals higher IAC counts. That's a good thing to know.
Here's something I found in my Haynes to help provide some more guidance. Instead of typing a long paragraph, I'm going to put into steps. Start the engine and run it as close to idle speed as possible until it reaches its normal operating temperature.
Run it for approximately 2 minutes at RPM. Drive the vehicle as far as necessary, approximately 5 miles of varied driving conditions is usually sufficient to complete the relearning process. Robert A. Can you please tell me how to check the counts of the IAC? Pull ECM fuse for about 30 sec. So far for the last 3 years I have never had a problem doing it this way. The problem I have, after the car warms up, you can hear, and see on the tach, it doing a periodic "bounce" down from rpm, or whatever it's supossed to be idling at all the time when warm.
The car never stalls, because it recovers very quickly, but I didn't know if this was an indication of a failing IAC motor? The car never does this when given gas I have replaced the Ignition Module a year ago, as this did go bad tach would bounce all over the place at times, and stall the engine when really warm, etc How can I Trouble shoot this, or is this a classic sign of a failing IAC motor? It's easy enough to replace, but I don't want to do it, unless it is what is causing the problem for sure.
If all else fails, go to the gm garage and have the idle reset. I have learned that cleaning the throttle body before starting up after a battery disconnect helps tremendously!!! No creeping idle