2013 Lincoln MKZ Has Rough Idle

Common Causes of Rough Idling in Your 2013 Lincoln MKZ and How to Resolve Them

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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 2013 Lincoln MKZ 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 Lincoln MKZ 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 Lincoln MKZ?

To effectively diagnose a rough idle in your 2013 Lincoln MKZ, start with a systematic approach that prioritizes simpler checks before delving into more complex diagnostics. Begin by inspecting the spark plugs, as worn or damaged plugs can significantly impact engine performance and lead to rough idling. Next, examine the air filter; a clogged filter can disrupt the air-fuel mixture, exacerbating idle issues. Following this, assess the fuel system components, including the fuel injectors, fuel filter, and fuel pump, to ensure they are functioning properly. Utilizing an OBD-II scanner to check for error codes can provide valuable insights into specific problems affecting the engine. Additionally, inspect the PCV valve and the Idle Air Control (IAC) valve, as both play crucial roles in maintaining stable idle speeds. A thorough examination of the throttle body for cleanliness and functionality is also essential, as any obstruction can hinder airflow. Finally, check for vacuum leaks in hoses and connections, as these can lead to erratic engine behavior. By following this structured diagnostic approach, you can identify and address the root causes of rough idling in your vehicle effectively.

What are the common problems that could cause a rough idle in a 2013 Lincoln MKZ?

When dealing with a rough idle in your 2013 Lincoln MKZ, it's crucial to consider several common issues that could be affecting your vehicle's performance. One of the primary culprits is dirty or faulty spark plugs, which can lead to engine misfires and an uneven idle. Additionally, a clogged fuel filter may restrict fuel flow, further contributing to the roughness. It's also important to check for vacuum leaks, as these can disrupt the air-fuel mixture essential for smooth engine operation. A malfunctioning oxygen sensor can throw off the air-fuel balance, while a dirty mass airflow sensor can similarly impact engine performance. Lastly, issues with the Exhaust Gas Recirculation (EGR) valve can also lead to a rough idle. By systematically addressing these potential problems, you can restore your MKZ's performance and enjoy a smoother driving experience.

How urgent is it to address the rough idle in a 2013 Lincoln MKZ?

Addressing a rough idle in your 2013 Lincoln MKZ should not be overlooked, as it can indicate underlying engine issues that may escalate if left unattended. Symptoms such as poor fuel efficiency, engine misfires, or even more severe engine damage can arise from neglecting this problem. While it may not pose an immediate safety risk, the potential for costly repairs increases significantly over time. For DIY enthusiasts, it’s crucial to recognize that a rough idle could stem from various sources, including spark plug malfunctions, fuel system irregularities, or air intake complications. By diagnosing and resolving these issues promptly, you not only enhance your vehicle's performance but also extend its lifespan. Regular maintenance and timely intervention are key to ensuring your Lincoln MKZ remains reliable and efficient on the road.

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2013 Lincoln MKZ Rough Idle: Causes & Repairs | RepairPal