2022 Mercedes-Benz G63 AMG Has Rough Idle

Resolve Rough Idle in 2022 Mercedes-Benz G63 AMG for a Smoother Ride

Find Repair Location
Reviewed by
Devin Cabugcal
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 Mercedes-Benz G63 AMG 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 Mercedes-Benz G63 AMG 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 initial diagnostic steps to take for a rough idle in a 2022 Mercedes-Benz G63 AMG?

When faced with a rough idle in your 2022 Mercedes-Benz G63 AMG, it's essential to adopt a systematic diagnostic approach to identify the root cause. Start by checking for fault codes using a diagnostic scanner, as these codes can reveal specific issues within the vehicle's computer system. Next, inspect the spark plugs for wear or fouling, as these components play a crucial role in engine performance. A clean air filter is also vital; ensure it is free from debris to maintain proper airflow. Additionally, examine the vacuum lines for any leaks, as these can disrupt the air-fuel mixture and lead to idle problems. Don't overlook the fuel system; check the fuel filter and injectors to ensure they are functioning correctly. Finally, inspect the throttle body for any carbon buildup or obstructions that could hinder airflow. By following these steps, you can effectively narrow down the potential causes of a rough idle and take the necessary actions to restore your vehicle's performance.

What are the common causes of a rough idle in a 2022 Mercedes-Benz G63 AMG?

When dealing with a rough idle in your 2022 Mercedes-Benz G63 AMG, it's crucial to understand the common problems that may be at play. One of the primary culprits could be dirty or faulty spark plugs, which can cause misfiring and disrupt the engine's smooth operation. Additionally, clogged fuel injectors can hinder the proper fuel-air mixture, leading to an uneven idle. Another potential issue is vacuum leaks, which can create an imbalance in the air-fuel ratio, further exacerbating the rough idle. It's also important to consider the condition of the oxygen sensor, as a malfunctioning sensor can significantly impact engine performance. Problems with the mass airflow sensor can affect the air intake, contributing to the rough idle as well. Lastly, don't overlook the fuel system; issues such as a clogged fuel filter or a failing fuel pump can also play a significant role in causing a rough idle. By addressing these common causes, you can help restore your G63 AMG's performance and enjoy a smoother driving experience.

How urgent is it to address the rough idle in a 2022 Mercedes-Benz G63 AMG?

Addressing a rough idle in your 2022 Mercedes-Benz G63 AMG is not just a matter of convenience; it is a critical issue that demands immediate attention. Ignoring this symptom can lead to a cascade of problems, including decreased fuel efficiency and compromised engine performance, which may escalate into more severe mechanical failures. The underlying causes, such as faulty spark plugs or clogged fuel injectors, can worsen over time, potentially resulting in costly repairs and diminished vehicle reliability. Moreover, a rough idle can indicate issues that may pose safety risks, making it imperative to diagnose and resolve the problem promptly. Regular maintenance and timely intervention are essential to ensure the longevity and optimal performance of your vehicle, so if you notice any signs of rough idling, it is advisable to consult a qualified mechanic without delay.

You’ve got options with RepairPal

Whether you need a more accurate auto repair estimate or help finding a reputable shop in your area, we’ve got you covered.

2022 Mercedes-Benz G63 AMG Rough Idle: Causes & Repairs