2024 Chevrolet Malibu Has Rough Idle

Troubleshooting Causes of Rough Idle in Your 2024 Chevrolet Malibu and How to Resolve Them

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Reviewed by
Bo Fader
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 Chevrolet Malibu 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 Chevrolet Malibu 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 2024 Chevrolet Malibu?

To effectively diagnose a rough idle in your 2024 Chevrolet Malibu, start with a diagnostic approach that emphasizes simplicity and efficiency. Begin by using an OBD-II scanner to check for any error codes, as these can quickly point you to potential issues within the vehicle's computer system. Next, inspect the spark plugs; worn or fouled plugs are common culprits of rough idling and should be replaced if they show signs of damage. Following this, examine the air filter for cleanliness, as a clogged filter can restrict airflow and exacerbate idle problems. It's also crucial to check for vacuum leaks by inspecting hoses and connections, as any leaks can disrupt the air-fuel mixture. After addressing these simpler checks, move on to the fuel system, ensuring that components like the fuel filter and injectors are functioning properly. Cleaning the throttle body is another important step, as carbon buildup can hinder airflow. Finally, inspect the exhaust system for any restrictions or leaks that could affect engine performance. By following this structured approach, you can systematically identify and resolve the causes of a rough idle, ensuring your Malibu runs smoothly.

What are the common problems that could cause a rough idle in a 2024 Chevrolet Malibu?

When dealing with a rough idle in your 2024 Chevrolet Malibu, it's essential to consider several 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 critical component to examine is the vacuum system; any leaks can disrupt the air-fuel mixture, resulting in an unstable idle. Fuel system issues, such as a clogged fuel filter or a malfunctioning fuel pump, can also impact engine performance and should not be overlooked. Furthermore, the mass airflow sensor plays a vital role in regulating the air-fuel mixture, and if it malfunctions, it can lead to rough idling. Lastly, consider the EGR valve; if it is faulty, it can disrupt the combustion process, further exacerbating idle issues. By systematically checking these components, you can effectively diagnose and potentially resolve the rough idle problem in your Malibu, making it a rewarding DIY project.

How urgent is it to address the rough idle in my 2024 Chevrolet Malibu?

Addressing a rough idle in your 2024 Chevrolet Malibu is crucial for maintaining the vehicle's performance and longevity. Ignoring this symptom can lead to a cascade of problems, including decreased fuel efficiency and engine misfires, which not only affect your driving experience but can also result in costly repairs down the line. A rough idle may indicate underlying issues such as faulty spark plugs, fuel system malfunctions, or air intake problems, all of which can worsen if left unattended. Moreover, the longer you wait to address these symptoms, the higher the risk of serious engine damage, which could compromise your vehicle's safety and reliability. Therefore, it is essential to prioritize this issue and seek timely solutions to ensure your Chevrolet Malibu operates smoothly and efficiently.

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