2023 Chevrolet Suburban Has Rough Idle

Troubleshooting Causes of Rough Idle in Your 2023 Chevrolet Suburban 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 2023 Chevrolet Suburban 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 2023 Chevrolet Suburban 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 2023 Chevrolet Suburban?

When diagnosing a rough idle in a 2023 Chevrolet Suburban, it's crucial to follow a methodical approach that begins with the simplest checks before moving on to more complex diagnostics. Start by utilizing an OBD-II scanner to retrieve any error codes from the vehicle's computer system, as these codes can provide immediate insights into potential issues. Next, inspect the air filter; a clean air filter is vital for proper airflow, and replacing a dirty one can often resolve idle problems. After that, examine the spark plugs for signs of wear or fouling, since they are essential for optimal engine performance. If these initial steps do not uncover the issue, shift your focus to the fuel system, checking for clogs or malfunctions that could disrupt fuel delivery. Additionally, inspect the vacuum hoses for any leaks, as these can significantly affect the air-fuel mixture and lead to rough idling. Cleaning the throttle body is also important, as a buildup of dirt can impede engine responsiveness. Finally, assess the mass airflow sensor to ensure it is clean and functioning properly, as it plays a critical role in regulating the engine's air-fuel mixture. By adhering to this structured diagnostic process, you can effectively pinpoint and resolve the causes of a rough idle in your Suburban.

What are the common problems that could cause a rough idle in a 2023 Chevrolet Suburban?

When dealing with a rough idle in your 2023 Chevrolet Suburban, 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 affects engine smoothness. 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 malfunctioning fuel injectors, can also contribute to rough idling by affecting fuel delivery. Furthermore, problems within the ignition system, including failing ignition coils, can lead to similar symptoms. Lastly, a malfunctioning mass airflow sensor can throw off the air-fuel ratio, exacerbating the rough idle. By systematically checking these components, you can identify and address the root cause of the rough idle, ensuring your Suburban runs smoothly.

How urgent is it to address the rough idle in a 2023 Chevrolet Suburban?

When dealing with a rough idle in your 2023 Chevrolet Suburban, it is crucial to recognize the urgency of the situation. A rough idle can indicate underlying problems that may compromise the safety and performance of your vehicle. For instance, if the rough idle is linked to engine misfires or fuel delivery issues, it could lead to more severe engine damage if left unaddressed. Additionally, a rough idle often results in decreased fuel efficiency, which not only affects your wallet but also contributes to increased emissions, potentially causing your vehicle to fail emissions tests. Therefore, it is advisable to diagnose and resolve the issue promptly. By taking action early, you can prevent further complications, ensure the safe operation of your vehicle, and maintain compliance with environmental regulations. Ultimately, addressing a rough idle in a timely manner is essential for preserving the health of your engine and enhancing your driving experience.

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