2016 Honda Fit Has Rough Idle

Causes of Rough Idling in Your 2016 Honda Fit and How to Resolve the Issue for a Smoother Ride

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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 2016 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 2016 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 2016 Honda Fit?

To effectively diagnose a rough idle in your 2016 Honda Fit, start with a systematic approach that prioritizes simpler checks before delving into more complex diagnostics. Begin by using an OBD-II scanner to identify any error codes that may indicate specific issues within the engine. This initial step can save time and direct your focus to the most likely culprits. Next, inspect the air filter; a clean filter is essential for optimal airflow, and replacing a dirty one is a straightforward fix. Following this, examine the spark plugs for wear or fouling, as these can lead to misfires and contribute to a rough idle. After addressing these components, turn your attention to the fuel system, checking for clogs in the fuel filter or issues with the injectors. Additionally, inspect the vacuum hoses for any leaks or cracks that could disrupt the air-fuel mixture. Cleaning the throttle body is another crucial step, as buildup can hinder airflow. Finally, check for vacuum leaks using a smoke machine or carburetor cleaner, as these can significantly affect engine performance. By following this structured diagnostic approach, you can efficiently identify and resolve the causes of a rough idle in your Honda Fit.

What are the common causes of a rough idle in a 2016 Honda Fit?

When dealing with a rough idle in your 2016 Honda Fit, it's crucial to understand the common problems that could be at play. One of the first things to check is the air filter; a dirty or clogged air filter can significantly restrict airflow to the engine, leading to performance issues. Additionally, inspect the spark plugs, as worn or faulty plugs can cause misfiring, which directly contributes to a rough idle. Another area to investigate is the vacuum system for any leaks, as these can disrupt the air-fuel mixture and affect engine performance. Fuel system issues, such as a clogged fuel filter or malfunctioning fuel injectors, can also hinder proper fuel delivery, resulting in an uneven idle. Lastly, consider the ignition coils; if they are not functioning correctly, they may produce irregular sparks in the combustion chamber, further exacerbating the rough idle. By systematically checking these components, you can identify and address the root cause of the rough idle, ensuring your Honda Fit runs smoothly.

How urgent is it to address the rough idle in my 2016 Honda Fit?

Addressing a rough idle in your 2016 Honda Fit should be treated with a sense of urgency, as neglecting this symptom can lead to significant engine problems and safety risks. A rough idle often signals underlying issues within the engine's air, fuel, or spark systems, which are crucial for proper ignition and overall performance. If left unaddressed, these issues can result in decreased fuel efficiency, drivability challenges, and even damage to vital engine components, leading to costly repairs down the line. Moreover, if your check engine light is illuminated, it is essential to diagnose the problem using OBD II codes, as this can provide insight into the specific malfunction. Taking proactive measures, such as performing a tune-up and inspecting critical components like spark plugs and air filters, can help resolve the rough idle before it escalates into a more serious issue. In summary, while it may not seem like an immediate emergency, timely attention to a rough idle is crucial for maintaining the health and longevity of your vehicle.

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