2024 Kia Soul Has Rough Idle

Troubleshooting Causes of Rough Idle in Your 2024 Kia Soul 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 2024 Kia Soul 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 2024 Kia Soul 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 and fix a rough idle in a 2024 Kia Soul?

To effectively diagnose and fix a rough idle in your 2024 Kia Soul, start with a systematic approach that prioritizes simpler solutions before delving into more complex diagnostics. Begin by using an OBD-II scanner to check for any error codes, as these can provide immediate insights into potential issues. Next, inspect the spark plugs for wear or damage, as faulty plugs can significantly affect engine performance. A clean air filter is essential for optimal airflow, so ensure it is either cleaned or replaced if dirty. Following this, examine the fuel system, including the fuel filter and injectors, for clogs that could disrupt fuel delivery. Additionally, check the Positive Crankcase Ventilation (PCV) valve, as a malfunction here can contribute to rough idling. Don’t overlook the importance of inspecting vacuum hoses for leaks, as these can lead to performance issues. Cleaning the throttle body is also crucial, as carbon buildup can hinder smooth idling. Finally, verify that coolant levels are adequate, since overheating can exacerbate idle problems. If these steps do not resolve the issue, it may be time to test the Idle Air Control (IAC) valve and consider professional assistance for a thorough diagnosis. By following this structured approach, you can effectively address the rough idle in your Kia Soul.

What are the common causes of a rough idle in a 2024 Kia Soul?

When dealing with a rough idle in your 2024 Kia Soul, it's essential to understand the common problems that could be causing this issue. One of the primary culprits is a dirty or clogged air filter, which can significantly restrict airflow to the engine, leading to performance issues. Additionally, faulty spark plugs may result in misfiring, contributing to an uneven idle. Another potential cause is vacuum leaks, which can disrupt the air-fuel mixture necessary for smooth engine operation. Fuel system problems, such as clogged fuel filters or injectors, can also hinder fuel delivery, exacerbating idle issues. Furthermore, a malfunctioning oxygen sensor can cause the engine to run either too rich or too lean, negatively impacting idle quality. Lastly, throttle body issues, including carbon buildup or a faulty throttle position sensor, can lead to irregular idling. Regular maintenance and timely repairs are crucial in addressing these issues, and if the rough idle persists, seeking assistance from a qualified mechanic is recommended for a comprehensive diagnosis.

How urgent is it to address the rough idle in a 2024 Kia Soul?

Addressing a rough idle in your 2024 Kia Soul should be treated with a sense of urgency, as neglecting this symptom can lead to more severe engine issues and decreased vehicle performance. A rough idle often indicates underlying problems, such as fuel delivery issues, ignition system malfunctions, or even vacuum leaks, which can progressively worsen if not resolved. By taking the time to diagnose and fix the issue early on, you not only enhance your vehicle's fuel efficiency but also prevent potential damage that could result in costly repairs down the line. Regular maintenance checks and timely interventions are key to ensuring your Kia Soul runs smoothly and efficiently. Therefore, if you notice a rough idle, it’s advisable to investigate the cause promptly, as this proactive approach can save you time and money while ensuring the longevity of your vehicle.

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