2022 Mercedes-Benz SL63 AMG Has Rough Idle

Resolve Rough Idle in 2022 Mercedes-Benz SL63 AMG for a Smoother Ride

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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 2022 Mercedes-Benz SL63 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 SL63 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 SL63 AMG?

When faced with a rough idle in your 2022 Mercedes-Benz SL63 AMG, it's essential to adopt a systematic diagnostic approach to identify and resolve the issue effectively. Start by checking for error codes using an OBD-II scanner, as these codes can reveal specific problems within the engine management system. Next, inspect the spark plugs for wear or fouling, as these components are crucial for proper ignition; replacing any damaged plugs can significantly improve idle quality. Additionally, ensure that the air filter is clean, as a clogged filter can restrict airflow and negatively impact engine performance. It's also important to check for vacuum leaks by examining hoses and lines for cracks or wear, as these leaks can disrupt the air-fuel mixture. Don't overlook the fuel system; inspect the fuel filter and injectors for clogs or malfunctions that could lead to performance issues. Cleaning the throttle body is another vital step, as carbon buildup can hinder its operation and contribute to a rough idle. Lastly, verify that coolant levels are adequate, as low coolant can lead to overheating and further complications. By following these diagnostic steps, you can effectively troubleshoot and address the rough idle in your SL63 AMG, ensuring optimal performance and driving experience.

What are the common problems that could cause a rough idle in a 2022 Mercedes-Benz SL63 AMG?

When dealing with a rough idle in your 2022 Mercedes-Benz SL63 AMG, it's crucial to understand the common problems that may be at play. One of the primary culprits is dirty or clogged air filters, which can significantly restrict airflow to the engine, leading to performance issues. Additionally, faulty spark plugs are notorious for causing misfires, which can manifest as a rough idle. Another potential issue is vacuum leaks; these can disrupt the delicate air-fuel mixture necessary for smooth engine operation. Fuel system problems, such as a clogged fuel filter or a malfunctioning fuel pump, can also contribute to an unstable idle by affecting fuel delivery. Lastly, a faulty oxygen sensor can throw off the air-fuel ratio, resulting in poor engine performance and a rough idle. By identifying and addressing these common issues, you can restore your vehicle's performance and ensure a smoother driving experience.

How urgent is it to address the rough idle in a 2022 Mercedes-Benz SL63 AMG?

Addressing a rough idle in your 2022 Mercedes-Benz SL63 AMG is not just a matter of comfort; it is a critical step in maintaining the vehicle's performance and safety. A rough idle can indicate serious underlying problems, such as misfiring cylinders or faulty sensors, which, if ignored, may escalate into more severe engine damage. This neglect can lead to decreased fuel efficiency and increased emissions, negatively impacting both your wallet and the environment. Moreover, timely intervention can significantly extend the life of your engine, saving you from costly repairs in the future. Therefore, if you notice your SL63 AMG idling roughly, it is essential to act quickly to diagnose and resolve the issue, ensuring your vehicle remains in optimal condition and safe to drive.

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