2013 BMW 750Li XDrive Has Rough Idle

Common Causes of Rough Idling in Your 2013 BMW 750Li xDrive and How to Resolve Them

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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 2013 BMW 750Li xDrive 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 750Li xDrive 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 750Li xDrive?

To effectively diagnose a rough idle in your 2013 BMW 750Li xDrive, start by checking for any Diagnostic Trouble Codes (DTCs) using an OBD-II scanner. This tool will help you identify specific issues that may be affecting your vehicle's performance. Next, inspect the dashboard for any warning lights, as these can provide immediate clues about underlying problems. Common culprits for a rough idle include vacuum leaks, faulty spark plugs, or ignition coil issues, so it's wise to consider these possibilities early in your troubleshooting process. Additionally, familiarize yourself with BMW-specific trouble codes, such as P2101, which indicates a throttle actuator malfunction, as these can guide you toward the right components to inspect. If you find the diagnostic process overwhelming or if the issue persists after your initial checks, don’t hesitate to reach out to a trusted BMW mechanic for professional assistance. By following these steps, you can systematically narrow down the cause of the rough idle and take informed actions to resolve it.

How urgent is it to address the rough idle in a 2013 BMW 750Li xDrive?

Addressing a rough idle in your 2013 BMW 750Li xDrive is not just a matter of comfort; it is a critical maintenance task that should be prioritized. Ignoring this symptom can lead to more severe engine problems, which may result in costly repairs down the line. A rough idle often indicates underlying issues such as a disrupted air-fuel mixture or combustion process, which, if left unchecked, can escalate into significant engine damage. Common causes include dirty or malfunctioning components like the Idle Control Valve or clogged fuel injectors, both of which can severely impact your vehicle's performance. Additionally, vacuum leaks, often found in the intake boot or air filter assembly, can exacerbate the problem. By addressing these issues promptly, you not only safeguard your engine's health but also ensure a smoother driving experience. Therefore, if you notice a rough idle, it is crucial to diagnose and resolve the issue as soon as possible to prevent further complications and maintain the integrity of your BMW.

What are the common problems that could cause a rough idle in a 2013 BMW 750Li xDrive?

When diagnosing a rough idle in your 2013 BMW 750Li xDrive, it's essential to consider several common problems that could be affecting your vehicle's performance. One of the primary issues is a vacuum leak, which can disrupt the air-fuel mixture and lead to erratic engine behavior, often accompanied by a check engine light. Another critical factor to examine is the condition of the spark plugs; worn or damaged spark plugs can cause misfires, resulting in an unstable idle. Additionally, problems with the ignition coil should not be overlooked, as it plays a vital role in generating the spark necessary for combustion. By addressing these issues promptly, you can enhance your driving experience and maintain the overall health of your BMW 750Li xDrive.

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2013 BMW 750Li xDrive Rough Idle: Causes & Repair Costs