2018 Honda CR-V Has Rough Idle

Causes of Rough Idling in Your 2018 Honda CR-V and How to Resolve the Issue for a Smoother Ride

Find Repair Location
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 2018 Honda CR-V 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 2018 Honda CR-V 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 2018 Honda CR-V?

To effectively diagnose a rough idle in your 2018 Honda CR-V, start with a systematic approach that prioritizes simpler checks before moving on to more complex diagnostics. Begin by using an OBD-II scanner to check for any error codes, as these can quickly point you to specific issues within the vehicle's systems. Next, inspect the spark plugs for wear or fouling, as these components play a crucial role in engine performance. A clean air filter is essential for optimal airflow, so ensure it is not clogged or dirty. Additionally, examine the vacuum hoses for leaks, which can disrupt the air-fuel mixture and lead to idling problems. Don’t overlook the fuel system; check the fuel filter and injectors for any malfunctions that could affect engine performance. Cleaning the throttle body can also help if you notice carbon buildup affecting its operation. Finally, if the rough idle persists, perform a compression test to assess the engine's overall health. By following this diagnostic approach, you can identify and address the root causes of a rough idle effectively.

What are the common causes of a rough idle in a 2018 Honda CR-V?

When diagnosing a rough idle in your 2018 Honda CR-V, it's crucial 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, 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 potential culprit is vacuum leaks, which can disrupt the air-fuel mixture and result in an unstable idle. Don't overlook the fuel system; issues such as clogged fuel filters or injectors can hinder engine performance. Furthermore, a malfunctioning oxygen sensor can throw off the air-fuel ratio, exacerbating idle problems. Lastly, consider the ignition system, as faults in components like the ignition coil can also lead to rough idling. By systematically checking these areas, you can effectively troubleshoot and resolve the rough idle issue in your Honda CR-V.

How urgent is it to address the rough idle in my 2018 Honda CR-V?

Addressing a rough idle in your 2018 Honda CR-V is not just a matter of comfort; it is crucial for the overall health of your vehicle. A rough idle can signal serious underlying problems, such as issues with the fuel system, ignition components, or even engine wear. If left unchecked, these problems can escalate, leading to more severe engine damage and costly repairs. Additionally, a rough idle often correlates with decreased fuel efficiency, which can impact your wallet over time. By prioritizing the resolution of this issue, you not only enhance your driving experience but also safeguard your vehicle's longevity and performance. Therefore, if you notice your CR-V idling roughly, it is essential to investigate and address the problem promptly to avoid further complications and ensure your vehicle remains safe and reliable on the road.

You’ve got options with RepairPal

Whether you need a more accurate auto repair estimate or help finding a reputable shop in your area, we’ve got you covered.

2018 Honda CR-V Rough Idle Causes & Repairs | RepairPal