2017 Fiat 500X Has Rough Idle

Troubleshooting Causes of Rough Idle in Your 2017 Fiat 500X 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 2017 Fiat 500X 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 Fiat 500X 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.

Brake caliper failure occurs in two different ways, and they create different symptoms.

The caliper can become stuck, in which case it won't release the brake pads. The seized caliper will cause the vehicle to brake constantly on one side, forcing the car to move toward that side. This pulling will be accompanied by a strong odor from one wheel.

Another way calipers fail is by leaking. If the caliper leaks, the brake pedal will feel too easy to push, and will sink all the way to the floor when held. Braking will become less effective the longer this goes on. There may also be brake fluid leaking onto the wheel.

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.

Brake rotors are mainly maintenance free, but when they have been subjected to abnormally hard use, the heat they absorb can cause the metal to turn blue, and cracking to occur. When this occurs, customers often specify they have lost braking power, or the vehicle's brakes are making noise. There may be no symptoms at all related to changing the brake rotors, since it is recommended to change brake rotors on most modern vehicles when performing a standard brake service.

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 Fiat 500X?

When addressing a rough idle in your 2017 Fiat 500X, it's essential to adopt a methodical diagnostic approach that begins with the most straightforward checks. Start by using an OBD-II scanner to retrieve any fault codes from the vehicle's computer, as these codes can quickly point you toward specific issues. Next, inspect the spark plugs for wear or fouling, as these components play a crucial role in engine performance; replacing damaged plugs can often resolve idle problems. Don’t overlook the air filter; a clogged filter can restrict airflow, so ensure it’s clean and replace it if necessary. Additionally, check for vacuum leaks by examining hoses and connections, as any leaks can disrupt the air-fuel mixture and lead to a rough idle. Cleaning the throttle body is another vital step, as carbon buildup can hinder its function. Finally, assess the fuel system, including the fuel filter and injectors, to ensure they are operating correctly. By following these steps, you can effectively diagnose and potentially resolve the rough idle issue in your Fiat 500X, making your DIY efforts both efficient and rewarding.

What are the common causes of a rough idle in a 2017 Fiat 500X?

When dealing with a rough idle in your 2017 Fiat 500X, it's crucial to understand the common problems that may 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. Another potential issue is vacuum leaks; these can disrupt the delicate balance of the air-fuel mixture, resulting in an unstable idle. Fuel system problems, such as clogged fuel filters or injectors, can also hinder engine performance and contribute to rough idling. Furthermore, a malfunctioning mass airflow sensor can throw off the air-fuel mixture, exacerbating the issue. Lastly, don’t overlook the ignition system; faulty ignition coils or distributors can lead to similar symptoms. By identifying and addressing these common problems, you can enhance your vehicle's performance and ensure a smoother driving experience.

How urgent is it to address the rough idle in a 2017 Fiat 500X?

Addressing a rough idle in your 2017 Fiat 500X is not just a matter of comfort; it is crucial for the overall health of your vehicle. A rough idle can signal underlying engine problems that, if ignored, may escalate into more severe issues, potentially leading to costly repairs. For instance, neglecting this symptom can result in decreased fuel efficiency, which not only affects your wallet but also increases emissions, contributing to environmental concerns. Moreover, a rough idle might indicate serious mechanical failures that could compromise your safety on the road. Timely intervention can prevent these risks, ensuring that your vehicle operates smoothly and efficiently. Regular maintenance and prompt repairs are essential to avoid the pitfalls of neglect, ultimately extending the life of your Fiat 500X and safeguarding your investment. Therefore, if you notice a rough idle, it is imperative to address it as soon as possible to maintain optimal performance and prevent further complications.

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2017 Fiat 500X Rough Idle Causes & Solutions | RepairPal