2017 Hyundai Sonata Has Rough Idle

Causes of Rough Idling in Your 2017 Hyundai Sonata and How to Resolve the Issue

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Reviewed by
Aisha
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 2017 Hyundai Sonata 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 2017 Hyundai Sonata 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.

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.

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 initial diagnostic steps to take for a rough idle in a 2017 Hyundai Sonata?

When faced with a rough idle in your 2017 Hyundai Sonata, start by checking the spark plugs, as worn or faulty plugs can significantly impact engine performance. Next, inspect the air filter; a dirty or clogged filter can restrict airflow, leading to uneven idling. It's also crucial to examine the fuel system, including the fuel injectors and fuel pump, to ensure proper fuel delivery. Utilizing an OBD-II scanner can provide insights into any error codes that may indicate specific problems. Additionally, don't overlook the PCV valve, as a malfunction here can contribute to rough idling. Finally, inspect for any vacuum leaks in the hoses and connections, as these can disrupt engine performance. By systematically addressing these areas, you can effectively diagnose and potentially resolve the rough idle issue in your Sonata.

What are the common causes of a rough idle in a 2017 Hyundai Sonata?

When experiencing a rough idle in your 2017 Hyundai Sonata, it's essential to consider several common problems that could be at play. Start by inspecting the air filters; if they are dirty or clogged, they can significantly restrict airflow to the engine, leading to performance issues. Next, check the spark plugs for signs of wear or fouling, as these can cause misfires that contribute to an uneven idle. The mass airflow sensor is another critical component; if it's malfunctioning, it can disrupt the air-fuel mixture, further affecting idle quality. Additionally, examine the fuel system for any clogs in the fuel filter or issues with the fuel injectors, as these can impede proper fuel delivery. Don't overlook the possibility of vacuum leaks in the intake system, which can introduce excess air and disrupt the engine's balance. Lastly, faulty ignition coils can lead to uneven engine operation, resulting in a rough idle. By systematically addressing these areas, you can enhance your Sonata's idle quality and ensure a smoother driving experience.

How urgent is it to address the rough idle in a 2017 Hyundai Sonata?

Addressing a rough idle in your 2017 Hyundai Sonata should be treated with urgency, as it can signal underlying engine problems that may escalate if left unattended. A rough idle not only affects the vehicle's performance but can also lead to decreased fuel efficiency and increased wear on engine components. Common culprits like dirty fuel injectors or worn spark plugs may seem minor, yet they can significantly impact your driving experience and lead to more costly repairs if ignored. On the other hand, more serious issues such as malfunctioning sensors or ignition system failures require immediate attention to avoid potential safety risks and extensive damage. Therefore, it is crucial to diagnose and resolve the rough idle promptly, ensuring your Sonata operates smoothly and efficiently while safeguarding your investment in the vehicle.

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