2017 Honda Accord Has Rough Idle

Causes of Rough Idling in Your 2017 Honda Accord and How to Resolve the Issue

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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 2017 Honda Accord 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 Honda Accord 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.

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 Honda Accord?

When addressing a rough idle in your 2017 Honda Accord, it's essential to adopt a systematic diagnostic approach that begins with the simplest solutions before progressing to more complex issues. Start by checking the spark plugs, as worn or faulty plugs can significantly impact engine performance. Next, inspect the air filter; a dirty or clogged filter can restrict airflow, leading to an uneven idle. Following this, examine the fuel system components, including the fuel injectors and filter, to ensure proper fuel delivery. Utilizing an OBD-II scanner to check for error codes can provide insights into any underlying problems that may not be immediately visible. Additionally, inspect the vacuum hoses for any leaks, as these can disrupt engine performance. Finally, consider cleaning the throttle body to remove any carbon buildup that could be affecting airflow. By methodically working through these steps, you can effectively identify and resolve the causes of a rough idle, ensuring your Honda Accord runs smoothly.

What are the common causes of a rough idle in a 2017 Honda Accord?

When diagnosing a rough idle in a 2017 Honda Accord, 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. 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, malfunctioning ignition coils may lead to uneven engine operation, exacerbating the issue. Lastly, a dirty or malfunctioning throttle body can impede airflow, further complicating the idle situation. By systematically checking these components, you can effectively identify and resolve the rough idle problem in your Honda Accord, ensuring smoother engine performance.

How urgent is it to address the rough idle in my 2017 Honda Accord?

When it comes to your 2017 Honda Accord, addressing a rough idle should be a priority, even if it doesn't seem like an immediate emergency. A rough idle can indicate underlying issues such as faulty spark plugs, vacuum leaks, or problems within the fuel system. If left unchecked, these issues can escalate, leading to decreased fuel efficiency, engine misfires, and potentially severe damage to engine components. For DIY enthusiasts, understanding the urgency of these symptoms is crucial; timely intervention can save you from more extensive repairs and costly bills down the line. Regular maintenance and prompt repairs not only enhance your vehicle's performance but also extend its lifespan. Therefore, if you notice your Accord idling roughly, it's wise to investigate the cause sooner rather than later to maintain the overall health and safety of your vehicle.

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