2013 Ford Fusion Has Rough Idle

Causes of Rough Idling in Your 2013 Ford Fusion and How to Resolve the Issue for a Smoother Ride

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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 Ford Fusion 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 Ford Fusion 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 Ford Fusion?

To effectively diagnose a rough idle in your 2013 Ford Fusion, start with a systematic approach that prioritizes simpler checks before delving into more complex diagnostics. Begin by using an OBD-II scanner to identify any fault codes, as these can quickly point you to specific issues within the vehicle's systems. Next, inspect the spark plugs for wear or fouling, as these are often the culprits behind rough idling. If the spark plugs appear to be in good condition, move on to the ignition system, checking the ignition coils and wires for any faults. Following this, examine the air intake system, ensuring that the air filter is clean and that there are no obstructions in the throttle body or intake manifold. A thorough inspection of the fuel system is also crucial; check the fuel filter, injectors, and pressure to confirm they are functioning properly. Don’t overlook the vacuum hoses, as any cracks or disconnections can lead to significant idle issues. Finally, test the mass airflow sensor, as its performance directly affects the air/fuel mixture. By following this structured diagnostic approach, you can efficiently identify and resolve the underlying causes of a rough idle in your vehicle.

What are the common causes of a rough idle in a 2013 Ford Fusion?

When dealing with a rough idle in your 2013 Ford Fusion, it's essential to understand the common problems that could be at play. One of the primary culprits is dirty or faulty spark plugs, which can cause misfiring and lead to an unstable idle. Additionally, a clogged fuel filter may restrict fuel flow, negatively impacting engine performance. Vacuum leaks are another frequent issue, as they can disrupt the air-fuel mixture necessary for smooth operation. A malfunctioning mass airflow sensor can also throw off the air-fuel ratio, contributing to rough idling. Furthermore, problems with the idle air control valve can result in erratic idling behavior. Lastly, a dirty throttle body can hinder airflow, exacerbating the rough idle issue. By identifying and addressing these common problems, you can enhance your vehicle's performance and enjoy a smoother driving experience. Regular maintenance and timely repairs are key to preventing these issues from arising.

How urgent is it to address the rough idle in a 2013 Ford Fusion?

Addressing a rough idle in your 2013 Ford Fusion is crucial for maintaining both safety and performance. A rough idle often indicates underlying engine problems that, if left unresolved, can escalate into more severe issues, potentially leading to costly repairs or even engine failure. Ignoring this symptom not only risks your vehicle's efficiency but can also compromise your safety on the road. Early identification of the root cause can prevent further complications, ensuring your vehicle runs smoothly and lasts longer. Therefore, it is essential to take immediate action to diagnose and resolve the rough idle, safeguarding your investment and enhancing your driving experience.

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2013 Ford Fusion Rough Idle Symptoms & Repairs | RepairPal