2022 Kia Forte Has Rough Idle

Common Causes of Rough Idling in Your 2022 Kia Forte and How to Resolve Them

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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 2022 Kia Forte 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 2022 Kia Forte 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 2022 Kia Forte?

To effectively diagnose a rough idle in your 2022 Kia Forte, start with the simplest checks to identify potential issues. Begin by using an OBD-II scanner to check for any error codes, as these can quickly point you to specific problems within the engine. Next, inspect the air filter; a clogged filter can significantly restrict airflow, leading to performance issues. If the air filter appears dirty, replace it to ensure optimal airflow. Following this, examine the spark plugs for wear or fouling, as faulty spark plugs can cause misfires that contribute to a rough idle. If the spark plugs are in poor condition, replacing them can often resolve the issue.

Next, turn your attention to the fuel system. Check for any clogs in the fuel filter or issues with the fuel injectors, as these can disrupt fuel delivery and affect engine performance. Additionally, inspect the vacuum hoses for any leaks or cracks, as these can alter the air-fuel mixture and lead to rough idling. If you find any damaged hoses, replace them promptly. Cleaning the throttle body is another crucial step, as a buildup of dirt can impede airflow into the engine. Finally, check for vacuum leaks using a smoke machine or carburetor cleaner, as these leaks can significantly impact engine performance. By following this structured approach, you can systematically diagnose and address the rough idle in your Kia Forte, ensuring a smoother driving experience.

What are the common problems that could cause a rough idle in a 2022 Kia Forte?

When dealing with a rough idle in your 2022 Kia Forte, it's essential to consider several common problems that could be at play. One of the first things 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 critical area to examine is the vacuum system for any leaks, as these can disrupt the air-fuel mixture essential for smooth engine operation. Fuel system components, including the fuel filter and injectors, should also be assessed, as clogs or malfunctions here can adversely affect engine performance. Furthermore, the mass airflow sensor plays a vital role in regulating the air-fuel mixture, and any faults in this sensor can lead to idling problems. Lastly, don't overlook the EGR valve; if it's not functioning correctly, it can disrupt the combustion process, resulting in a rough idle. By systematically checking these components, you can effectively diagnose and address the rough idle issue in your Kia Forte.

How urgent is it to address the rough idle in my 2022 Kia Forte?

When it comes to your 2022 Kia Forte, addressing a rough idle should not be overlooked, as it can signal various underlying issues that may escalate if left unattended. A rough idle often indicates problems such as dirty fuel injectors, a clogged air filter, or malfunctioning sensors, which can lead to decreased fuel efficiency and potential engine damage over time. Moreover, if the rough idle is a symptom of more serious concerns like a misfiring engine or a faulty ignition system, the risks increase significantly. Ignoring these symptoms can result in costly repairs and may even compromise your vehicle's safety. For DIY enthusiasts, taking the initiative to diagnose and resolve these issues promptly can not only enhance your Kia Forte's performance but also extend its lifespan. Regular maintenance and timely repairs are key to ensuring a smoother driving experience, making it essential to address a rough idle as soon as it arises.

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