2017 Ford F-350 Super Duty Has Rough Idle

Troubleshooting Causes of Rough Idle in Your 2017 Ford F-350 Super Duty 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 2017 Ford F-350 Super Duty 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 2017 Ford F-350 Super Duty 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 2017 Ford F-350 Super Duty?

When faced with a rough idle in your 2017 Ford F-350 Super Duty, 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 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 not clogged, as restricted airflow can lead to idling issues. Additionally, examine the vacuum hoses for any signs of damage or disconnection, since leaks can significantly impact engine performance. Testing the mass airflow sensor is another critical step; a malfunctioning sensor can disrupt the air-fuel mixture, exacerbating idle problems. Finally, assess the fuel system, including the fuel filter and injectors, to ensure proper fuel delivery. By following this structured approach, you can effectively diagnose and address the rough idle, restoring your vehicle's performance.

What are the common problems that could cause a rough idle in a 2017 Ford F-350 Super Duty?

When diagnosing a rough idle in a 2017 Ford F-350 Super Duty, 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 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, which can also contribute to a rough idle experience. Fuel system issues, such as a clogged fuel filter or malfunctioning fuel injectors, can further complicate the situation by disrupting the fuel delivery necessary for smooth engine operation. Another potential issue is vacuum leaks, which can disturb the air-fuel mixture and result in an unstable idle. Furthermore, a malfunctioning Mass Airflow Sensor (MAF) can lead to incorrect air-fuel ratios, exacerbating idle problems. Lastly, don't overlook the Exhaust Gas Recirculation (EGR) valve; if it's not functioning correctly, it can negatively impact the combustion process, leading to rough idling. By addressing these common issues through regular maintenance and timely repairs, you can enhance your F-350's engine performance and ensure a smoother driving experience.

How urgent is it to address the rough idle in my 2017 Ford F-350 Super Duty?

Addressing a rough idle in your 2017 Ford F-350 Super Duty is not just a matter of comfort; it is crucial for the overall health and safety of your vehicle. A rough idle can indicate underlying engine problems that, if left unresolved, may escalate into more severe issues, leading to costly repairs and decreased vehicle performance. Moreover, neglecting this symptom can result in diminished fuel efficiency, which not only impacts your wallet but also contributes to increased emissions. Safety is another critical factor; a rough idle could signal problems with essential components that, if compromised, may pose serious risks while driving. Therefore, it is imperative to prioritize the diagnosis and repair of a rough idle to ensure your vehicle operates smoothly and safely, ultimately prolonging its lifespan and maintaining its reliability on the road.

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2017 Ford F-350 Super Duty Rough Idle Causes & Solutions