2013 BMW 535i GT Has Rough Idle

Troubleshooting Causes of Rough Idle in Your 2013 BMW 535i GT and Solutions for a Smoother Ride

Find Repair Location
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 2013 BMW 535i GT has rough idle are a vacuum leak, an issue with the spark plugs, or a problem with the ignition coil.
  • Spark Plugs: A worn or fouled spark plug can cause misfires, rough idling, and decreased fuel efficiency due to incomplete combustion.
  • 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 2013 BMW 535i GT 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 2013 BMW 535i GT?

When faced with a rough idle in your 2013 BMW 535i GT, it's essential to adopt a systematic diagnostic approach to identify the root cause effectively. Start by checking for fault codes using a diagnostic scanner, as these codes can reveal specific issues within the engine management system. Next, inspect the spark plugs; they should be clean and functioning correctly, as worn or fouled plugs can significantly impact engine performance. Don’t overlook the air filter; a clogged filter can restrict airflow, leading to an uneven idle. Additionally, examine the vacuum hoses for any signs of wear or leaks, as these can disrupt the air-fuel mixture. It's also crucial to assess the fuel system, including the fuel pump, filter, and injectors, to ensure they are operating correctly. Finally, take a look at the throttle body for any carbon buildup or dirt that could hinder its performance. By following these steps, you can systematically narrow down the potential causes of the rough idle and take the necessary actions to restore your vehicle's performance.

What are the common problems that could cause a rough idle in a 2013 BMW 535i GT?

When dealing with a rough idle in your 2013 BMW 535i GT, it's essential to understand the common problems that could be at play. One of the primary culprits is a dirty or faulty mass airflow sensor, which can disrupt the delicate balance of the air-fuel mixture, leading to an unstable idle. Additionally, vacuum leaks can significantly affect engine performance by allowing excess air into the system, further complicating the air-fuel ratio. Worn spark plugs or malfunctioning ignition coils are also frequent offenders, as they can cause misfires that manifest as rough idling. Another potential issue is a clogged fuel filter, which restricts fuel flow and can hinder engine performance. Furthermore, problems with the idle control valve can lead to irregular idle speeds, while a malfunctioning throttle body can disrupt the air intake process. By systematically checking these components, you can identify and address the root cause of the rough idle, ensuring your BMW runs smoothly once again.

How urgent is it to address the rough idle in my 2013 BMW 535i GT?

Addressing a rough idle in your 2013 BMW 535i GT is not just a matter of convenience; it is crucial for maintaining the overall health and performance of your vehicle. Ignoring this symptom can lead to serious engine problems, such as misfiring cylinders or fuel system malfunctions, which may result in costly repairs down the line. Additionally, a rough idle can significantly impact your fuel efficiency, causing you to spend more on gas as the engine struggles to operate smoothly. The discomfort caused by vibrations and shaking during your drive can detract from your overall driving experience, making it less enjoyable and potentially distracting. Moreover, a rough idle can increase harmful emissions, which not only affects the environment but may also lead to failing emissions tests. Therefore, it is essential to prioritize diagnosing and resolving the rough idle issue promptly to ensure your BMW runs efficiently, remains safe, and provides a comfortable driving experience.

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.

2013 BMW 535i GT Rough Idle: Causes & Repair Costs