2017 Mercedes-Benz GLE43 AMG Has Rough Idle

Resolve Rough Idle in Your 2017 Mercedes-Benz GLE43 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 2017 Mercedes-Benz GLE43 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 GLE43 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 initial diagnostic steps to take for a rough idle in a 2017 Mercedes-Benz GLE43 AMG?

When faced with a rough idle in your 2017 Mercedes-Benz GLE43 AMG, start by checking for fault codes using a diagnostic scanner. This tool can reveal specific issues logged in the vehicle's computer, guiding your next steps. Following this, inspect the spark plugs for wear or fouling, as these can significantly affect engine performance. A clean and functional air filter is also crucial; ensure it is not clogged, as restricted airflow can lead to idling problems. Next, examine the vacuum lines for any leaks or damage, as these can disrupt the air-fuel mixture essential for smooth operation. Additionally, assess the fuel system, including the fuel filter and injectors, to confirm that fuel delivery is optimal. Lastly, take a look at the throttle body for any buildup that could hinder its function. By systematically addressing these areas, you can effectively diagnose and potentially resolve the rough idle issue in your vehicle.

What are the common problems that could cause a rough idle in a 2017 Mercedes-Benz GLE43 AMG?

When diagnosing a rough idle in your 2017 Mercedes-Benz GLE43 AMG, it's essential to consider several common problems that could be affecting your vehicle's performance. One of the primary culprits is a dirty or faulty mass airflow sensor, which can disrupt the delicate balance of air and fuel entering the engine, leading to an uneven idle. Additionally, vacuum leaks can create an improper air-fuel mixture, further exacerbating the rough idle issue. Worn or faulty spark plugs are another frequent cause, as they can lead to engine misfires that manifest as a rough idle. A clogged fuel filter may also restrict fuel flow, impacting engine performance and contributing to the problem. Furthermore, issues with the idle air control valve can disrupt the engine's idle speed, while a malfunctioning oxygen sensor can negatively affect the air-fuel mixture, resulting in poor engine performance. If you encounter a rough idle, it's advisable to systematically check these components to identify and resolve the underlying issue, ensuring your vehicle runs smoothly.

How urgent is it to address the rough idle in my 2017 Mercedes-Benz GLE43 AMG?

Addressing a rough idle in your 2017 Mercedes-Benz GLE43 AMG is not just a matter of comfort; it is crucial for maintaining the overall health and performance of your vehicle. A rough idle can indicate serious underlying problems, such as misfiring cylinders or fuel system malfunctions, which, if left unchecked, could lead to significant engine damage. Moreover, this issue can adversely affect your vehicle's performance, resulting in decreased fuel efficiency and compromised drivability. Ignoring these symptoms may also pose safety risks, particularly if the rough idle impacts the vehicle's stability during low-speed maneuvers or while idling in traffic. Therefore, it is essential to address a rough idle promptly to avoid escalating repairs and ensure your vehicle operates safely and efficiently. Taking action now can save you from costly repairs down the line and enhance your driving experience.

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