2023 Hyundai Elantra Has Rough Idle

Troubleshooting Causes of Rough Idle in Your 2023 Hyundai Elantra and How to Resolve Them

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Reviewed by
Bo Fader
Written by RepairPal Car Genius
Updated January 14, 2025
0%
21% chance it's the
Spark Plugs
0%
15% chance it's the
Ignition Coil
0%
64% chance it's
Something else
The most common reasons a 2023 Hyundai Elantra has rough idle are a vacuum leak, an issue with the spark plugs, or a problem with the ignition coil.
  • Spark Plugs: Worn or fouled spark plugs can lead to misfires, poor fuel economy, and difficulty starting the engine.
  • Ignition Coil: A faulty ignition coil can cause misfires, rough idling, and difficulty starting the engine due to inadequate spark delivery to the spark plugs.
Proper diagnosis will determine the exact cause of your symptom, saving you money on unnecessary repairs. The diagnostic experts at RepairPal Certified shops have the right tools and experience to solve any symptom.

How much does it cost to fix a 2023 Hyundai Elantra has rough idle?

Common Repairs

The total repair cost will vary based on the condition of your vehicle and the number of repairs needed to fix your symptom. Proper diagnosis will save you money by finding the exact repairs needed to fix your car right the first time.

Brake caliper failure occurs in two different ways, and they create different symptoms.

The caliper can become stuck, in which case it won't release the brake pads. The seized caliper will cause the vehicle to brake constantly on one side, forcing the car to move toward that side. This pulling will be accompanied by a strong odor from one wheel.

Another way calipers fail is by leaking. If the caliper leaks, the brake pedal will feel too easy to push, and will sink all the way to the floor when held. Braking will become less effective the longer this goes on. There may also be brake fluid leaking onto the wheel.

Here are a few common symptoms of worn-out brake pads:

  1. Low brake pad warning light is on: Not all vehicles are equipped with this system, but if yours is, this dashboard indicator light will likely be the first signal it’s time to replace your brake pads.
  2. Brakes start to squeal regularly: This is often one of the first signs of worn brake pads and is caused by a metallic piece built into brake pads for this exact purpose. This part contacts the brake rotor to make a squealing or whining noise when the pads are low.
  3. Brakes make loud grinding noise: If not addressed early enough, your brake pads may get so worn that the metal backing plate of the pad grinds against the metal rotor.
  4. Brake pads look thin: You may be able to visually check your brake pad thickness to determine if they need replacement.

Brake rotors are mainly maintenance free, but when they have been subjected to abnormally hard use, the heat they absorb can cause the metal to turn blue, and cracking to occur. When this occurs, customers often specify they have lost braking power, or the vehicle's brakes are making noise. There may be no symptoms at all related to changing the brake rotors, since it is recommended to change brake rotors on most modern vehicles when performing a standard brake service.

Most often, a brake system inspection will just be a routine portion of manufacturer specified maintenance, and will be performed at mileage intervals. In those cases, there will likely be no symptoms. However, when a brake system makes a funny noise, causes vibration, is hard to use, will not slow the vehicle, prevents the vehicle from driving, makes the vehicle pull to one side, or leaks brake fluid, the vehicle will need a visit dedicated to the inspection of the brake system.

What are the steps to diagnose a rough idle in a 2023 Hyundai Elantra?

To effectively diagnose a rough idle in your 2023 Hyundai Elantra, start with a systematic approach that prioritizes simpler checks before moving on to more complex diagnostics. Begin by using an OBD-II scanner to identify any error codes that may indicate specific issues within the engine. This initial step can save time and direct your focus to the most likely culprits. Next, inspect the spark plugs, as worn or fouled plugs can significantly impact engine performance. A quick check of the air filter is also essential; a clogged filter can restrict airflow, leading to rough idling. Additionally, examine the vacuum hoses for any signs of damage or disconnection, as leaks can disrupt engine function. Don’t overlook the fuel system; ensure that fuel injectors are clean and the fuel pump is operating correctly, as proper fuel delivery is crucial for smooth idling. Finally, inspect the throttle body for cleanliness and functionality, as a dirty throttle body can contribute to idle issues. By following this structured diagnostic approach, you can efficiently identify and resolve the causes of a rough idle in your vehicle.

What are the common problems that could cause a rough idle in a 2023 Hyundai Elantra?

When dealing with a rough idle in your 2023 Hyundai Elantra, it's crucial to understand the common problems that could be at play. One of the first areas to check is the air filter; a dirty or clogged filter can significantly restrict airflow, leading to performance issues. Next, inspect the spark plugs, as worn or faulty plugs can cause misfires, which are often felt as a rough idle. Additionally, look for any vacuum leaks, as these can disrupt the air-fuel mixture and result in unstable idling. Fuel system components, including the fuel filter and pump, should also be examined, as clogs or malfunctions can hinder engine performance. The Mass Airflow Sensor (MAF) is another critical component; if it's malfunctioning, it can throw off the air-fuel ratio, contributing to rough idling. Don't overlook the throttle body, as carbon buildup or sensor issues can affect engine responsiveness. Lastly, consider the possibility of an engine misfire, which may stem from ignition or fuel delivery problems. By systematically checking these areas, you can identify and address the root cause of the rough idle, ensuring your Elantra runs smoothly.

How urgent is it to address the rough idle in my 2023 Hyundai Elantra?

Addressing a rough idle in your 2023 Hyundai Elantra is crucial for maintaining both safety and performance. A rough idle can indicate underlying engine problems, such as issues with the fuel or ignition systems, which, if left unresolved, may lead to more severe complications. Ignoring this symptom can result in decreased fuel efficiency and diminished engine performance, ultimately risking damage to other components. Moreover, a rough idle could signal serious issues that may escalate over time, making timely intervention essential. Regular maintenance and prompt repairs not only enhance your vehicle's longevity but also ensure a smoother driving experience. Therefore, it is vital to prioritize addressing a rough idle to avoid potential safety risks and costly repairs down the line.

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2023 Hyundai Elantra Rough Idle: Causes & Solutions