2017 Honda Civic Has Rough Idle

Causes of Rough Idling in Your 2017 Honda Civic 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 2017 Honda Civic 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 Civic 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 steps to diagnose a rough idle in a 2017 Honda Civic?

When diagnosing a rough idle in a 2017 Honda Civic, it's essential to adopt a systematic diagnostic approach that prioritizes simpler checks before delving into more complex issues. Start by using an OBD-II scanner to check for any error codes, as these can quickly point you toward specific problems within the engine. Next, inspect the spark plugs for wear or fouling, since these components play a crucial role in engine performance. A clean air filter is also vital; ensure it’s not clogged, as restricted airflow can significantly affect idle quality. Following this, examine the vacuum hoses for leaks, which can disrupt the air-fuel mixture and lead to rough idling. Don’t overlook the fuel system; check the fuel filter and injectors for any malfunctions that could be contributing to the issue. Additionally, inspect the throttle body for carbon buildup, as cleaning it can often enhance idle performance. Finally, assess the exhaust system for any blockages, such as a clogged catalytic converter, which can also impact engine idling. By following this structured approach, you can effectively identify and resolve the rough idle issue in your Honda Civic.

What are the common problems that could cause a rough idle in a 2017 Honda Civic?

When dealing with a rough idle in your 2017 Honda Civic, it's essential to consider several common problems that could be at play. One of the first areas to check is the air filter; a dirty or clogged air filter can significantly restrict airflow to the engine, which may lead to an uneven idle. Additionally, inspect the spark plugs, as worn or faulty plugs can cause misfiring, contributing to the roughness. Another critical aspect to examine is the vacuum system for any leaks, as these can disrupt the air-fuel mixture and result in poor engine performance. Fuel system issues, such as a clogged fuel filter or malfunctioning fuel injectors, can also impact how smoothly your engine runs. Furthermore, a faulty oxygen sensor can throw off the air-fuel ratio, exacerbating idle problems. Lastly, don’t overlook the ignition system; components like ignition coils or distributors that are not functioning correctly can lead to rough idling as well. By systematically checking these areas, you can effectively diagnose and potentially resolve the rough idle issue in your Civic.

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

Addressing the rough idle in your 2017 Honda Civic is crucial due to the potential risks associated with ignoring this symptom. A rough idle can indicate underlying engine problems that may escalate if not addressed, leading to more severe mechanical failures and costly repairs. Additionally, neglecting this issue can result in decreased fuel efficiency, which not only affects your wallet but also contributes to increased emissions. The urgency to resolve a rough idle is heightened by the fact that it can compromise your vehicle's overall performance and safety. By taking prompt action, you can ensure the longevity of your Civic and maintain its optimal functionality, making it essential to prioritize this maintenance task.

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