2012 Ford Taurus Has Rough Idle

Troubleshooting Causes of Rough Idle in Your 2012 Ford Taurus and How to Resolve Them

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Reviewed by
Aisha
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 2012 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 2012 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 steps to diagnose and fix a rough idle in a 2012 Ford Taurus?

To effectively diagnose and fix a rough idle in your 2012 Ford Taurus, start with a systematic approach that prioritizes simpler checks before moving on to more complex diagnostics. Begin by using an OBD-II scanner to check for any error codes, as these can provide immediate insight into potential issues. Next, inspect the spark plugs for wear, as faulty plugs can significantly impact engine performance. A clean air filter is crucial for maintaining the correct air-fuel mixture, so ensure it is not clogged. Additionally, examine the vacuum hoses for any cracks or disconnections that could lead to vacuum leaks. The fuel system should also be assessed for problems like clogged injectors or a malfunctioning fuel pressure regulator. Pay attention to the idle air control valve, as it regulates airflow at idle; cleaning or replacing it may resolve the issue. A dirty throttle body can disrupt airflow, so cleaning it is advisable. Don’t forget to check the mass airflow sensor, which is vital for measuring air intake, and inspect for any vacuum leaks using a smoke test. Lastly, evaluate the EGR valve to ensure it is functioning correctly. By following this structured diagnostic approach, you can effectively identify and resolve the causes of a rough idle in your vehicle.

What are the common causes of a rough idle in a 2012 Ford Taurus?

When diagnosing a rough idle in your 2012 Ford Taurus, it's essential 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 performance issues. Additionally, worn-out or faulty spark plugs may cause misfiring, contributing to an uneven idle. It's also crucial to check for vacuum leaks, as these can disrupt the air-fuel mixture and result in rough idling. Fuel system issues, such as a clogged fuel filter or malfunctioning fuel injectors, can further impact engine performance. Another potential issue is a faulty mass airflow sensor, which can alter the air-fuel mixture and lead to idling problems. Lastly, don't overlook the Exhaust Gas Recirculation (EGR) valve; if it's not functioning correctly, it can disrupt the combustion process and cause rough idling. By addressing these common issues through regular maintenance and timely repairs, you can improve your vehicle's performance and enjoy a smoother driving experience.

How urgent is it to address the rough idle in a 2012 Ford Taurus?

Addressing a rough idle in your 2012 Ford Taurus is not just a matter of comfort; it is crucial for the vehicle's overall health and safety. A rough idle can indicate serious underlying problems, such as faulty spark plugs, fuel system malfunctions, or issues with the air intake. Ignoring these symptoms can lead to decreased fuel efficiency and engine misfires, which may escalate into more severe damage over time. Moreover, a rough idle can serve as a warning sign of impending issues that could result in costly repairs if left unaddressed. By taking prompt action, you not only enhance your vehicle's performance but also extend its lifespan, making regular maintenance and timely repairs essential for any DIY enthusiast looking to keep their Taurus running smoothly.

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