2013 Ford Focus Has Rough Idle

Common Causes of Rough Idling in Your 2013 Ford Focus 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 Ford Focus 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 Focus 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 steps to diagnose and fix a rough idle in a 2013 Ford Focus?

To effectively diagnose and fix a rough idle in your 2013 Ford Focus, it's essential to adopt a systematic approach that prioritizes simpler solutions before tackling more complex issues. Start by inspecting the spark plugs, as worn or damaged plugs can significantly affect engine performance. If the spark plugs are in good condition, move on to the air filter; a clogged filter can disrupt the air-fuel mixture, leading to rough idling. Next, examine the fuel system components, including the fuel injectors and fuel filter, for any signs of malfunction. Utilizing an OBD-II scanner can provide valuable insights by revealing error codes that may point to specific problems. Additionally, check the PCV valve and the Idle Air Control (IAC) valve, as both are critical for maintaining proper engine function. Don't overlook the possibility of vacuum leaks in the intake system, which can also contribute to idle issues. Lastly, inspect the throttle body for carbon buildup or dirt, and clean it if necessary. If you've gone through these steps and the rough idle persists, it may be time to consult a professional mechanic for a more comprehensive diagnosis. By following this structured diagnostic approach, you can effectively address the rough idle issue and enhance your vehicle's performance.

What are the common problems that could cause a rough idle in a 2013 Ford Focus?

When dealing with a rough idle in a 2013 Ford Focus, it's essential to consider several common problems that could be affecting your vehicle's performance. 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. Additionally, vacuum leaks in the intake system can introduce unmetered air, causing an uneven idle. Worn-out spark plugs or malfunctioning ignition coils may lead to misfires, further contributing to the rough idle experience. A clogged fuel filter can also restrict fuel flow, impacting engine performance at idle. Other potential issues include problems with the Exhaust Gas Recirculation (EGR) valve, a malfunctioning throttle body, and dirty or faulty oxygen sensors, all of which can affect the air-fuel mixture and overall engine operation. By systematically checking these components, you can identify and address the root cause of the rough idle, ensuring your Ford Focus runs smoothly again.

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

Addressing a rough idle in your 2013 Ford Focus should be considered a priority, as neglecting this symptom can lead to a cascade of more serious problems. A rough idle often indicates underlying engine issues, such as faulty spark plugs, fuel system malfunctions, or air intake problems, which, if left unresolved, can result in decreased fuel efficiency and engine misfires. Over time, these issues may escalate, potentially causing significant damage to engine components and leading to costly repairs. Moreover, a rough idle can compromise your vehicle's performance and safety, making it crucial to diagnose and rectify the problem promptly. Regular maintenance and timely intervention not only enhance the longevity of your vehicle but also ensure a smoother driving experience. Therefore, while it may not seem urgent at first glance, addressing a rough idle sooner rather than later is essential for maintaining the overall health of your Ford Focus.

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