2018 Ford Taurus Has Rough Idle

Troubleshooting Causes of Rough Idle in Your 2018 Ford Taurus and How to Restore Smooth Performance

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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 2018 Ford Taurus 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 2018 Ford Taurus 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 initial diagnostic steps to take for a rough idle in a 2018 Ford Taurus?

When faced with a rough idle in your 2018 Ford Taurus, it's essential to adopt a methodical 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 systems. Next, inspect the air filter; a dirty or clogged filter can significantly hinder airflow, leading to performance issues. Following this, examine the spark plugs for wear or fouling, as these components are crucial for proper ignition and can cause misfires if compromised. Additionally, assess the fuel system, including the fuel filter and injectors, to ensure they are functioning correctly and not contributing to the rough idle. Don't overlook the throttle body, which should be clean and free of defects to maintain the correct air-fuel mixture. Lastly, check the PCV valve, as a malfunctioning valve can disrupt engine performance. By systematically addressing these areas, you can effectively diagnose and remedy the rough idle, ensuring your Taurus runs smoothly.

What are the common causes of a rough idle in a 2018 Ford Taurus?

When diagnosing a rough idle in your 2018 Ford Taurus, it's crucial to consider several 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 an uneven idle. Additionally, faulty spark plugs are notorious for causing misfires; if they are worn out, they can disrupt the combustion process, resulting in a rough idle. Another potential issue is vacuum leaks, which can disturb the air-fuel mixture necessary for smooth engine operation. Fuel system problems, such as clogged fuel filters or malfunctioning fuel injectors, can also hinder performance and contribute to rough idling. Furthermore, a faulty mass airflow sensor may miscalculate the amount of air entering the engine, affecting the air-fuel mixture and leading to idling issues. Lastly, don't overlook the Exhaust Gas Recirculation (EGR) valve; if it malfunctions, it can interfere with the combustion process, causing the engine to idle roughly. By understanding these common causes, you can take the necessary steps to troubleshoot and potentially resolve the rough idle in your Ford Taurus.

How urgent is it to address the rough idle in my 2018 Ford Taurus?

Addressing a rough idle in your 2018 Ford Taurus is not just a matter of comfort; it is crucial for the overall health of your vehicle. Ignoring this symptom can lead to more severe engine problems, decreased fuel efficiency, and ultimately, costly repairs. A rough idle often indicates underlying issues that, if left unchecked, could escalate into significant damage, compromising your vehicle's performance and safety. Moreover, regular maintenance and timely intervention can enhance the longevity of your Taurus, ensuring it runs smoothly for years to come. Therefore, it is essential to prioritize resolving a rough idle to avoid further complications and maintain the reliability of your vehicle.

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2018 Ford Taurus Rough Idle: Causes & Repairs | RepairPal