2014 Mazda 6 Has Rough Idle

Troubleshooting Causes of Rough Idle in Your 2014 Mazda 6 and How to Restore Smooth Performance

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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 2014 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 2014 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 2014 Mazda 6?

To effectively diagnose a rough idle in your 2014 Mazda 6, start with a systematic approach that prioritizes simpler checks before delving into more complex diagnostics. Begin by using an OBD-II scanner to check for any fault codes, as these can quickly point you to underlying issues. Next, inspect the spark plugs for wear or damage, since faulty plugs are a common culprit of rough idling. Following this, examine the air filter; a clean filter is essential for optimal airflow to the engine. Don’t overlook the vacuum hoses—check for any cracks or disconnections that could lead to leaks affecting engine performance. After these initial checks, test the mass airflow sensor to ensure it’s accurately measuring air intake, as a malfunction here can disrupt the air-fuel mixture. Additionally, inspect the fuel system, focusing on the fuel filter and injectors, as clogs can hinder fuel delivery. Finally, take a look at the throttle body; cleaning it can often resolve airflow issues that contribute to rough idling. By following this diagnostic approach, you can efficiently identify and address the root causes of a rough idle in your vehicle.

What are the common causes of a rough idle in a 2014 Mazda 6?

When dealing with a rough idle in your 2014 Mazda 6, it's crucial to understand the common problems that could be at play. One of the primary culprits is a dirty or clogged air filter, which can significantly restrict airflow to the engine, leading to performance issues. Additionally, faulty spark plugs are notorious for causing misfires, which can manifest as a rough idle. Another potential issue is vacuum leaks; these can disrupt the delicate balance of the air-fuel mixture, resulting in an unstable idle. Fuel system problems, such as clogged fuel filters or injectors, can also hinder engine performance and contribute to rough idling. Furthermore, a malfunctioning Mass Airflow Sensor (MAF) can throw off the air-fuel mixture, exacerbating the issue. Lastly, don't overlook the Exhaust Gas Recirculation (EGR) valve, as its failure can impact the combustion process and lead to rough idling. By identifying and addressing these common causes, you can restore your Mazda 6's performance and enjoy a smoother driving experience.

How urgent is it to address the rough idle in my 2014 Mazda 6 to prevent further damage or safety risks?

Addressing a rough idle in your 2014 Mazda 6 is not just a matter of comfort; it is crucial for your vehicle's overall health and your safety on the road. A rough idle can indicate serious underlying problems such as engine misfires or fuel system issues, which, if left unattended, can escalate into more significant damage and costly repairs. Moreover, neglecting this symptom can lead to decreased fuel efficiency, increasing your overall operating costs. The urgency to resolve a rough idle is heightened by the potential safety risks it poses; an unstable engine can affect your vehicle's performance, making it harder to control, especially in critical driving situations. Therefore, it is essential to prioritize this issue and seek timely maintenance or repairs to ensure your Mazda 6 operates smoothly and safely, ultimately protecting both your investment and your well-being on the road.

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