2013 Lexus GX460 Has Rough Idle

Troubleshooting Causes of Rough Idle in Your 2013 Lexus GX460 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 2013 Lexus GX460 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 2013 Lexus GX460 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.

Brake rotors are mainly maintenance free, but when they have been subjected to abnormally hard use, the heat they absorb can cause the metal to turn blue, and cracking to occur. When this occurs, customers often specify they have lost braking power, or the vehicle's brakes are making noise. There may be no symptoms at all related to changing the brake rotors, since it is recommended to change brake rotors on most modern vehicles when performing a standard brake service.

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 2013 Lexus GX460?

To effectively diagnose a rough idle in your 2013 Lexus GX460, start with a systematic approach that prioritizes simpler checks before delving into more complex diagnostics. Begin by using an OBD-II scanner to identify any fault codes that may indicate underlying issues. This initial step can save time and direct your focus to specific components. Next, inspect the spark plugs for wear or fouling, as these can significantly impact engine performance. A clean air filter is also crucial; ensure it is free from clogs that could restrict airflow. Following this, examine the fuel system, including the fuel filter and injectors, to rule out any fuel delivery problems. Don’t overlook the vacuum hoses; any cracks or disconnections can lead to vacuum leaks, which disrupt the air-fuel mixture and contribute to rough idling. Additionally, check the throttle body for carbon buildup, as cleaning it can enhance airflow and improve idle quality. By methodically addressing these areas, you can effectively diagnose and resolve the rough idle issue in your Lexus GX460.

What are the common causes of a rough idle in a 2013 Lexus GX460?

When diagnosing a rough idle in a 2013 Lexus GX460, it's essential to explore several common problems that may be contributing to the issue. A dirty or clogged air filter can significantly restrict airflow to the engine, leading to performance issues and an unstable idle. Additionally, worn or faulty spark plugs are known to cause misfires, which can manifest as a rough idle. Vacuum leaks are another potential culprit, as they can disrupt the air-fuel mixture balance, resulting in an uneven idle. Fuel system issues, such as clogged fuel filters or malfunctioning fuel injectors, can also hinder engine performance and contribute to rough idling. Furthermore, a malfunctioning mass airflow sensor can throw off the air-fuel mixture, exacerbating the rough idle symptoms. Lastly, problems within the ignition system, including faulty ignition coils or distributors, can lead to similar issues. Addressing these factors promptly is crucial for maintaining optimal vehicle performance and preventing further complications. If you're experiencing a rough idle, consider these common causes as you troubleshoot the problem.

How urgent is it to address the rough idle in a 2013 Lexus GX460 to prevent potential safety risks and further damage?

Addressing a rough idle in your 2013 Lexus GX460 is not just a matter of comfort; it is a critical safety concern that requires immediate attention. A rough idle can indicate serious underlying issues such as engine misfires or fuel system problems, which, if left unresolved, can lead to decreased fuel efficiency and compromised engine performance. Ignoring these symptoms may escalate into more significant mechanical failures, potentially resulting in costly repairs and unsafe driving conditions. For instance, a vehicle that struggles to maintain a smooth idle may experience erratic acceleration, making it difficult to control in high-stakes situations. Therefore, it is essential to prioritize a thorough inspection by a qualified mechanic to diagnose the root cause of the rough idle. By taking proactive measures, you not only enhance your vehicle's performance but also ensure your safety on the road, preventing long-term damage and costly repairs down the line.

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