Acura RLX Has Rough Idle

Troubleshooting Causes of Rough Idle in Your Acura RLX and How to Restore Smooth Performance

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Reviewed by
Aisha
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 Acura RLX 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 Acura RLX 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.

Troubleshooting Rough Idle in an Acura RLX

When troubleshooting a rough idle in your Acura RLX, it's essential to adopt a systematic diagnostic approach. Begin by inspecting the air filter, as a clogged filter can significantly impact engine performance. Next, check for any vacuum leaks, which are often overlooked but can lead to erratic idling. If these initial checks do not resolve the issue, examine the spark plugs and ignition coils, as faulty components in these areas can cause misfires that contribute to a rough idle. If the problem persists, consider utilizing diagnostic tools such as a tachometer to monitor engine RPMs and identify irregularities. Additionally, pay attention to the check engine light; if it illuminates, it may indicate underlying issues that require further investigation. By methodically addressing these potential causes, you can effectively diagnose and remedy the rough idle, ensuring your Acura RLX runs smoothly.

What Are the Common Causes of Rough Idle in an Acura RLX?

When experiencing a rough idle in your Acura RLX, it's essential to consider several common problems that could be at play. One significant factor is a vacuum leak, which can disrupt the engine's air-fuel mixture, leading to instability in idle performance. Additionally, worn or faulty spark plugs can cause engine misfires and poor acceleration, further contributing to a rough idle. Another critical component to inspect is the ignition coil; if it's malfunctioning, it can lead to similar issues. For certain models, particularly the 2014-2015 RLX, transmission problems may also affect idle quality due to rough shifting. Lastly, a rich air-fuel mixture can result in decreased throttle response and visible exhaust issues, indicating that the engine is not running optimally. By understanding these common causes, DIYers can effectively troubleshoot and address the rough idle in their Acura RLX, ensuring a smoother driving experience.

Why is My Acura RLX Idling Rough and What Should I Do?

When your Acura RLX experiences a rough idle, it’s crucial to act swiftly to prevent further complications. Ignoring symptoms like erratic idling or engine stalling can lead to more severe engine problems, including complete failure, which can be both costly and dangerous. Common culprits such as a clogged air filter or malfunctioning sensors can disrupt the engine's performance, while issues with the idle air control system may illuminate the check engine light and affect fuel efficiency. To diagnose the problem, start by checking for vacuum leaks, as these can significantly impact engine performance. Spraying carburetor cleaner around the engine bay can help identify leaks if the idle fluctuates in response. Additionally, testing the idle air control system with a tachometer can provide further insights into the issue. By addressing these problems promptly, you not only enhance the longevity of your vehicle but also ensure a safer driving experience. Regular maintenance and timely intervention are key to keeping your Acura RLX running smoothly and efficiently.

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Understanding Acura RLX Rough Idle Issues | RepairPal