2017 Kia Sorento Has Rough Idle

Diagnosing Causes of Rough Idling in Your 2017 Kia Sorento and How to Restore Smooth Performance

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Reviewed by
Andrew Hajjar
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 Kia Sorento 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 Kia Sorento 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 steps to diagnose a rough idle in a 2017 Kia Sorento?

To effectively diagnose a rough idle in your 2017 Kia Sorento, 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 fault 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 for wear or fouling, as these components play a crucial role in engine performance; replacing them can often resolve idle issues. Following this, examine the air filter for dirt or clogs, which can restrict airflow and contribute to rough idling. It's also essential to check the vacuum hoses for any damage or disconnections, as leaks can significantly impact engine performance. Additionally, inspect the fuel system, including the fuel filter and injectors, since blockages here can lead to similar symptoms. Cleaning the throttle body is another important step, as a buildup of grime can disrupt the air-fuel mixture. Finally, conduct a thorough inspection for any vacuum leaks in the intake manifold or hoses, as these can also cause rough idling. By following this structured diagnostic approach, you can effectively identify and address the underlying causes of a rough idle in your vehicle.

What are the common causes of a rough idle in a 2017 Kia Sorento?

When dealing with a rough idle in your 2017 Kia Sorento, 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 air filter can significantly restrict airflow to the engine, leading to performance issues. Additionally, inspect the spark plugs, as worn or faulty plugs can cause misfiring, which directly contributes to a rough idle. Another potential culprit is vacuum leaks, which can disrupt the air-fuel mixture and result in unstable idling. Don't overlook the fuel system; issues such as a clogged fuel filter or malfunctioning fuel injectors can severely impact engine performance. Furthermore, a faulty oxygen sensor can throw off the air-fuel ratio, exacerbating idle problems. Lastly, the mass airflow sensor plays a critical role in maintaining the correct air-fuel mixture, and any faults here can lead to similar rough idling symptoms. By systematically checking these components, you can identify and address the root cause of the rough idle, ensuring your Kia Sorento runs smoothly.

How urgent is it to address the rough idle in a 2017 Kia Sorento?

Addressing a rough idle in your 2017 Kia Sorento is not just a matter of comfort; it is crucial for the safety and longevity of your vehicle. A rough idle can indicate underlying engine problems, such as faulty spark plugs or issues within the fuel system, which, if left unattended, may lead to more severe complications. Ignoring these symptoms can result in decreased fuel efficiency and engine misfires, ultimately risking damage to critical engine components. Moreover, a rough idle may signal more serious issues that require immediate attention to avoid costly repairs down the line. Regular maintenance and prompt action in response to these symptoms are essential to ensure your vehicle operates smoothly and efficiently. Therefore, it is imperative to address a rough idle as soon as it is noticed to safeguard your vehicle's performance and prevent further complications.

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