2020 Acura TLX Has Rough Idle

Troubleshooting Causes of Rough Idle in Your 2020 Acura TLX and How to Restore Smooth Performance

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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 2020 Acura TLX 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 2020 Acura TLX 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 2020 Acura TLX?

To effectively diagnose a rough idle in your 2020 Acura TLX, 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 provide immediate insights into potential engine issues. Next, inspect the spark plugs; worn or faulty plugs are common culprits of rough idling and can be easily replaced. Following this, examine the air filter for dirt or clogs, as a clean air filter is essential for optimal air-fuel mixture. Don’t overlook the vacuum hoses; any leaks or damage here can significantly impact engine performance. Additionally, assess the fuel system, including the fuel filter and injectors, to ensure they are functioning correctly. Cleaning the throttle body can also enhance airflow and improve idle quality. Lastly, check the PCV valve and ignition system components, as these can also contribute to rough idling if they are malfunctioning. By following this structured diagnostic approach, you can efficiently identify and resolve the issues causing the rough idle in your Acura TLX.

What are the common problems that could cause a rough idle in a 2020 Acura TLX?

When dealing with a rough idle in a 2020 Acura TLX, it's essential to understand the common problems that could be contributing to this issue. 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 problem is vacuum leaks; these can disrupt the air-fuel mixture, resulting in an unstable idle. Fuel system issues, such as a clogged fuel filter or a malfunctioning fuel pump, can also impact engine performance and contribute to rough idling. Furthermore, a malfunctioning oxygen sensor can throw off the air-fuel ratio, exacerbating the rough idle condition. Lastly, issues with the mass airflow sensor can lead to incorrect air intake readings, causing further instability in engine performance. By identifying and addressing these common problems through regular maintenance and timely repairs, you can effectively resolve rough idle issues in your Acura TLX.

How urgent is it to address the rough idle in my 2020 Acura TLX?

Addressing a rough idle in your 2020 Acura TLX is crucial for maintaining both the performance and safety of your vehicle. A rough idle can indicate underlying engine problems, such as issues with the fuel system, spark plugs, or air intake, which, if left unresolved, may lead to decreased fuel efficiency and further damage to engine components. Ignoring these symptoms not only risks escalating repair costs but can also compromise your vehicle's reliability on the road. Moreover, a rough idle may signal more serious issues that could worsen over time, making prompt attention essential. Regular maintenance and timely intervention can significantly enhance your vehicle's longevity and performance, ensuring that you avoid more costly repairs in the future. Therefore, if you notice a rough idle, it is advisable to investigate and address the issue as soon as possible to safeguard your Acura TLX's health and your driving experience.

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2020 Acura TLX Rough Idle: Causes & Repair Costs | RepairPal