2020 Ford F-150 Has Rough Idle

Diagnosing Causes of Rough Idle in Your 2020 Ford F-150 and Solutions 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 2020 Ford F-150 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 2020 Ford F-150 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 2020 Ford F-150?

When faced with a rough idle in your 2020 Ford F-150, start by checking for fault codes using an OBD-II scanner, as this can quickly reveal any underlying issues within the vehicle's computer system. Next, inspect the spark plugs for wear or fouling, as these components play a crucial role in engine performance. A clean and functional air filter is also vital; ensure it is free from dirt and debris to maintain proper airflow. Additionally, examine the vacuum hoses for leaks, as any disruption in the air-fuel mixture can lead to idling problems. Don’t overlook the fuel system; check the fuel filter and injectors to confirm they are delivering fuel efficiently. Finally, inspect the throttle body for carbon buildup, which can hinder airflow and contribute to a rough idle. By systematically addressing these areas, you can effectively diagnose and resolve the rough idle issue in your F-150, making your DIY repair process smoother and more successful.

What are the common causes of a rough idle in a 2020 Ford F-150?

When diagnosing a rough idle in a 2020 Ford F-150, 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, faulty spark plugs are notorious for causing misfires, which can manifest as a rough idle. Fuel system problems, such as a clogged fuel filter or malfunctioning fuel injectors, can also disrupt the engine's performance at idle. Another potential issue is vacuum leaks, which can alter the air-fuel mixture and result in an unstable idle. Furthermore, a faulty oxygen sensor may cause the engine to run either too rich or too lean, further complicating idle quality. Lastly, a dirty or malfunctioning throttle body can impede airflow, contributing to a rough idle. By addressing these common issues through regular maintenance and timely repairs, you can enhance the idle quality of your Ford F-150 and ensure a smoother driving experience.

How urgent is it to address the rough idle in a 2020 Ford F-150?

Addressing a rough idle in your 2020 Ford F-150 should be treated as a priority due to the potential risks associated with ignoring this symptom. A rough idle can signal underlying engine problems that, if left unresolved, may escalate into more severe issues, leading to costly repairs and decreased vehicle performance. Additionally, neglecting this issue can result in diminished fuel efficiency, which not only affects your wallet but also contributes to increased emissions. Common culprits such as faulty spark plugs, fuel system malfunctions, or sensor failures can disrupt the engine's operation, making it crucial to diagnose and rectify the problem promptly. By taking immediate action, you can prevent further damage and ensure your truck remains reliable and efficient, ultimately safeguarding your investment and enhancing your driving experience.

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2020 Ford F-150 Rough Idle Causes & Repairs | RepairPal