2014 Ford Fiesta Has Rough Idle

Troubleshooting Causes of Rough Idle in Your 2014 Ford Fiesta and How to Resolve Them

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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 2014 Ford Fiesta 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 Ford Fiesta 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.

Customers with drum brake systems often specify they have lost braking power, or that the vehicle's brakes are making noise. This is because brake drums do not dissipate heat very well, so the heat from hard braking will cause stress fractures. These fractures make can make noise on the brake shoes as the drum revolves around the shoes. Lastly, the brake shoes may not be problematic, but may cause a grinding noise while stopping. This would indicate the shoes have no braking material left, and the brake shoes must be changed before the vehicle can be safely driven.

Learn more about brake shoe symptoms

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 2014 Ford Fiesta?

When faced with a rough idle in your 2014 Ford Fiesta, it's essential to adopt a systematic diagnostic approach to identify and resolve the issue effectively. Start by checking for fault codes using an OBD-II scanner, as these codes can reveal specific problems within the engine's computer system. Next, inspect the spark plugs for wear or fouling, as these components are crucial for proper ignition and can lead to misfires if compromised. Following this, evaluate the air filter; a clean air filter is vital for optimal airflow, and a clogged one can significantly hinder engine performance. Additionally, inspect the vacuum hoses for any signs of damage or disconnection, as leaks can disrupt the air-fuel mixture and contribute to a rough idle. Don't overlook the throttle body; cleaning it of any carbon buildup can enhance its functionality and improve idle quality. Lastly, conduct a thorough inspection for vacuum leaks in the intake system, as these can introduce excess air and destabilize the engine's idle. By methodically addressing these areas, you can effectively diagnose and remedy the rough idle issue in your vehicle.

What are the common causes of a rough idle in a 2014 Ford Fiesta?

When dealing with a rough idle in your 2014 Ford Fiesta, it's essential to understand the common problems that could be causing this issue. One of the primary culprits is a vacuum leak, which can disrupt the air-fuel mixture and lead to an unstable engine performance. Inspecting the vacuum hoses for cracks or disconnections can be a straightforward DIY task. Additionally, worn or faulty spark plugs can significantly affect engine smoothness; replacing them is a relatively simple procedure that can restore proper function. Another area to check is the ignition coil, as a malfunctioning coil can lead to misfires and rough idling. By systematically examining these components, you can identify and address the root cause of the rough idle, ensuring your Ford Fiesta runs smoothly again.

How urgent is it to address the rough idle in a 2014 Ford Fiesta?

Addressing a rough idle in your 2014 Ford Fiesta is not just a matter of comfort; it is crucial for the overall health of your vehicle. A rough idle can signal various underlying problems, such as dirty fuel injectors, a clogged air filter, or faulty spark plugs, which, if ignored, can escalate into more severe issues. Neglecting these symptoms can lead to decreased fuel efficiency, engine misfires, and even damage to critical engine components, ultimately resulting in costly repairs. Moreover, a rough idle can compromise your vehicle's performance and safety, making it essential to diagnose and resolve the issue promptly. Regular maintenance and timely repairs not only enhance your driving experience but also extend the lifespan of your vehicle, ensuring that you avoid significant complications down the road. Therefore, if you notice a rough idle, it is advisable to seek professional assistance to maintain the reliability and efficiency of your Ford Fiesta.

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2014 Ford Fiesta Rough Idle: Causes & Repairs | RepairPal