2020 Honda Fit Has Rough Idle

Common Causes of Rough Idling in Your 2020 Honda Fit and How to Resolve Them

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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 Honda Fit 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 Honda Fit 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.

Customers with drum brake systems often specify they have lost braking power, or that the vehicle's brakes are making noise. This is because brake drums do not dissipate heat very well, so the heat from hard braking will cause stress fractures. These fractures make can make noise on the brake shoes as the drum revolves around the shoes. Lastly, the brake shoes may not be problematic, but may cause a grinding noise while stopping. This would indicate the shoes have no braking material left, and the brake shoes must be changed before the vehicle can be safely driven.

Learn more about brake shoe symptoms

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 a rough idle in a 2020 Honda Fit?

To effectively diagnose a rough idle in your 2020 Honda Fit, start with the basics by checking the check engine light. If illuminated, using an OBD-II scanner can provide crucial trouble codes that point to specific issues. Next, inspect the spark plugs for wear or fouling, as these can significantly impact engine performance. A clean air filter is essential for optimal airflow, so ensure it is free from dirt and debris. Additionally, examine the vacuum hoses for any signs of damage or disconnection, as leaks can disrupt engine function. Moving on, assess the fuel system for potential problems like clogged injectors or a malfunctioning fuel pressure regulator, which are vital for maintaining a smooth idle. Cleaning the throttle body can also enhance idle quality by ensuring proper air intake. Don’t forget to check the PCV valve, as a faulty one can contribute to rough idling. Finally, inspect the ignition system components, including ignition coils and wires, to rule out misfires. By following this structured approach, you can effectively identify and resolve the rough idle issue, restoring your vehicle's performance.

What are the common problems that could cause a rough idle in a 2020 Honda Fit?

When dealing with a rough idle in your 2020 Honda Fit, 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; if they are worn out, they can disrupt the combustion process, resulting in a rough idle. Another issue to investigate is the presence of vacuum leaks, which can alter the air-fuel mixture and cause instability in engine performance. Fuel system problems, such as a clogged fuel filter or a malfunctioning fuel pump, can also contribute to a rough idle by affecting the delivery of fuel to the engine. Furthermore, a faulty oxygen sensor can throw off the air-fuel ratio, exacerbating idle issues. Lastly, don’t overlook potential ignition system problems, including faulty ignition coils or distributors, as these can also lead to rough idling. By understanding these common issues, you can take proactive steps to maintain your Honda Fit and ensure a smoother driving experience.

How urgent is it to address the rough idle in a 2020 Honda Fit?

Addressing a rough idle in your 2020 Honda Fit should be treated with a sense of urgency, as it can indicate underlying engine problems that may escalate if left unresolved. A rough idle not only affects the vehicle's performance but can also lead to decreased fuel efficiency and increased wear on engine components. Over time, these issues can result in more significant damage, leading to costly repairs that could have been avoided with timely intervention. Moreover, neglecting this symptom may compromise your vehicle's safety, as it could be a sign of more serious mechanical failures. Therefore, it is crucial to diagnose and address the rough idle promptly, ideally with the assistance of a qualified mechanic, to ensure your Honda Fit continues to operate smoothly and efficiently. Taking action now can save you from more severe complications and maintain the longevity of your vehicle.

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