2017 Kia Soul EV Has Rough Idle

Diagnosing Causes of Rough Idle in Your 2017 Kia Soul EV 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 Soul EV 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 Soul EV 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 the rough idle issue in a 2017 Kia Soul EV?

To effectively diagnose a rough idle issue in your 2017 Kia Soul EV, start with a systematic approach that prioritizes simpler checks before moving on to more complex diagnostics. Begin by using an OBD-II scanner to check for any error codes, as these can provide immediate insights into underlying problems. Next, inspect the spark plugs for wear or fouling, as these components play a crucial role in engine performance. A clean air filter is essential for optimal airflow, so ensure it is not clogged or dirty. Additionally, check for vacuum leaks in hoses and connections, as these can disrupt the air-fuel mixture and contribute to rough idling. The throttle body should also be examined for carbon buildup, which can hinder its function; cleaning it may resolve the issue. Testing the mass airflow sensor is another critical step, as a malfunctioning sensor can lead to erratic idling. Finally, inspect the idle air control valve, which regulates engine speed; cleaning or replacing it may be necessary if it is not functioning correctly. By following this structured diagnostic approach, you can effectively identify and address the rough idle issue in your vehicle.

What are the common problems that could cause a rough idle in a 2017 Kia Soul EV?

When dealing with a rough idle in your 2017 Kia Soul EV, it's crucial to understand the common problems that may be at play. Start by checking the spark plugs, as dirty or faulty ones can cause misfiring, which directly affects engine performance. Next, inspect the air filter; a clogged filter can restrict airflow, leading to an uneven idle. Additionally, look for vacuum leaks, as these can disrupt the air-fuel mixture essential for smooth engine operation. The oxygen sensor is another critical component; if it's malfunctioning, it can throw off the air-fuel ratio, resulting in a rough idle. Don't overlook the fuel system, either; issues like a clogged fuel filter or dirty fuel injectors can lead to misfires. Lastly, examine the throttle body for carbon buildup or sensor faults, as these can also impact idle speed. By systematically checking these areas, you can identify and potentially resolve the issues causing the rough idle, ensuring your Kia Soul EV runs smoothly.

How urgent is it to address the rough idle in my 2017 Kia Soul EV?

Addressing a rough idle in your 2017 Kia Soul EV is crucial for maintaining the vehicle's performance and safety. A rough idle can be a symptom of deeper mechanical issues, such as problems with the engine, fuel system, or ignition components. If left unaddressed, these issues can escalate, leading to more severe damage and costly repairs. Additionally, a rough idle often results in decreased fuel efficiency, which can impact your overall driving experience and increase your fuel expenses. Timely repairs not only help in preserving the engine's health but also enhance the vehicle's longevity. Therefore, it is advisable to consult a professional mechanic at the first sign of a rough idle to diagnose the problem accurately and implement necessary repairs, ensuring your Kia Soul EV remains reliable and efficient on the road.

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2017 Kia Soul EV Rough Idle: Causes & Solutions | RepairPal