2017 Mercedes-Benz G63 AMG Has Rough Idle

Resolve Rough Idle in 2017 Mercedes-Benz G63 AMG for a Smoother Ride

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Reviewed by
Aisha
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 2017 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 2017 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.

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.

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 2017 Mercedes-Benz G63 AMG?

To effectively diagnose a rough idle in your 2017 Mercedes-Benz G63 AMG, start with a systematic approach that prioritizes simpler checks before delving into more complex diagnostics. Begin by using a diagnostic scanner to check for any fault codes, as these can quickly point you to underlying issues. Next, inspect the spark plugs for wear or fouling, as these components are crucial for proper engine performance. A clean air filter is essential for optimal airflow, so ensure it is not clogged or dirty. Following this, examine the fuel system, including the fuel filter and injectors, to rule out any fuel delivery problems. Don’t overlook the vacuum hoses; check for leaks or damage that could disrupt engine performance. Additionally, inspect the throttle body for carbon buildup, which can impede its function. Finally, consider performing a smoke test to identify any vacuum leaks that may be affecting the air-fuel mixture. By following this structured diagnostic approach, you can effectively identify and address the causes of a rough idle in your vehicle.

What are the common causes of a rough idle in a 2017 Mercedes-Benz G63 AMG?

When dealing with a rough idle in your 2017 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. A faulty oxygen sensor may also be responsible, as it plays a vital role in regulating engine performance. Furthermore, problems with the mass airflow sensor can affect air intake, contributing to the issue. Lastly, don't overlook the fuel system; a clogged fuel filter or a failing fuel pump can significantly impact engine performance. By identifying and addressing these common problems, you can restore your G63 AMG's performance and enjoy a smoother driving experience.

How urgent is it to address the rough idle in my 2017 Mercedes-Benz G63 AMG?

Addressing a rough idle in your 2017 Mercedes-Benz G63 AMG is not just a matter of comfort; it is crucial for the overall health and safety of your vehicle. A rough idle can indicate serious underlying problems such as spark plug failures, fuel system malfunctions, or engine misfires, which, if left unattended, can escalate into more significant issues. Ignoring these symptoms can lead to decreased fuel efficiency, increased emissions, and even engine damage, which could result in costly repairs down the line. Moreover, a rough idle can compromise your vehicle's performance and safety, making it harder to control while driving. Therefore, it is essential to prioritize timely diagnostics and repairs by a professional mechanic to ensure your G63 AMG operates smoothly and efficiently, safeguarding both your investment and your safety on the road.

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