2013 Mazda 6 Has Rough Idle

Common Causes of Rough Idling in Your 2013 Mazda 6 and How to Resolve Them

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Reviewed by
Devin Cabugcal
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 Mazda 6 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 2013 Mazda 6 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 2013 Mazda 6?

To effectively diagnose a rough idle in your 2013 Mazda 6, start with a systematic approach that prioritizes simpler checks before moving on to more complex diagnostics. Begin by using an OBD-II scanner to check for any fault codes, as these can quickly point you to specific issues within the engine. Next, inspect the spark plugs for wear or fouling, as these components are crucial for proper ignition and can significantly affect idle quality. Following this, examine the air filter; a clogged filter can restrict airflow, leading to performance issues. Don’t overlook the vacuum hoses, as any cracks or disconnections can create leaks that disrupt engine performance. Testing the mass airflow sensor is also essential, as it plays a key role in maintaining the correct air-fuel mixture. Additionally, inspect the fuel system for potential problems like clogged injectors or a failing fuel pump, which can hinder fuel delivery. Finally, check the throttle body for cleanliness and functionality, as a dirty throttle body can lead to erratic idling. By following this diagnostic approach, you can methodically identify and address the root causes of a rough idle, ensuring your Mazda 6 runs smoothly again.

What are the common problems that could cause a rough idle in a 2013 Mazda 6?

When dealing with a rough idle in your 2013 Mazda 6, it's essential to consider several common issues 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 air and fuel entering the engine, leading to an uneven idle. Additionally, a clogged fuel filter may restrict fuel flow, causing the engine to struggle and idle roughly. Worn or faulty spark plugs are another frequent issue, as they can lead to misfiring, further contributing to an unstable idle. It's also important to check for vacuum leaks, as these can significantly alter the air-fuel ratio, resulting in performance problems. A malfunctioning oxygen sensor can impact engine efficiency and contribute to rough idling as well. Lastly, a dirty throttle body can hinder airflow, exacerbating the rough idle condition. By systematically inspecting these components, you can effectively diagnose and potentially resolve the rough idle issue in your vehicle.

How urgent is it to address the rough idle in my 2013 Mazda 6?

Addressing a rough idle in your 2013 Mazda 6 is not just a matter of comfort; it is crucial for the safety and longevity of your vehicle. A rough idle can indicate serious underlying problems such as faulty spark plugs, vacuum leaks, or issues within the fuel system. If left unattended, these issues can lead to decreased fuel efficiency, engine misfires, and even more severe damage to critical components, resulting in costly repairs. Moreover, a rough idle can compromise your vehicle's performance, making it less reliable on the road. By prioritizing the resolution of this issue, you not only enhance your driving experience but also safeguard against potential safety risks and ensure that your Mazda 6 remains in optimal condition for years to come. Therefore, it is essential to take immediate action to diagnose and fix the rough idle to prevent further complications down the line.

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