2013 Lexus IS250 Has Rough Idle

Troubleshooting Causes of Rough Idle in Your 2013 Lexus IS250 and How to Resolve Them

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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 2013 Lexus IS250 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 IS250 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 2013 Lexus IS250?

To effectively diagnose a rough idle in a 2013 Lexus IS250, 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 error codes, as these can quickly point you toward underlying issues. Next, inspect the spark plugs for wear or fouling, since these components are crucial for proper engine performance. A clean air filter is also essential; ensure it is free from clogs that could restrict airflow. Following this, evaluate the fuel system, including the fuel filter and injectors, as any malfunction here can significantly impact idle quality. Don’t overlook the vacuum hoses; check for leaks or damage that could disrupt the air-fuel mixture. Additionally, cleaning the throttle body can help maintain optimal airflow, while inspecting the idle air control valve ensures that the engine's idle speed is regulated correctly. By following this structured diagnostic approach, you can effectively identify and resolve the causes of a rough idle in your Lexus IS250.

What are the common causes of a rough idle in a 2013 Lexus IS250?

When dealing with a rough idle in your 2013 Lexus IS250, it's crucial to understand the common problems that could be at play. One of the primary culprits is dirty or faulty spark plugs, which can lead to engine misfires and an uneven idle. Additionally, clogged fuel injectors can disrupt the necessary fuel flow, exacerbating the roughness. Another potential issue is vacuum leaks, which can create an imbalance in the air-fuel mixture, further contributing to the problem. A malfunctioning mass airflow sensor (MAF) can also impact the air-fuel ratio, leading to irregular idling. Lastly, issues with the idle air control valve (IAC) can directly affect the engine's idle speed. By identifying and addressing these common issues, you can restore your Lexus IS250's performance and ensure a smoother driving experience.

How urgent is it to address the rough idle in my 2013 Lexus IS250?

Addressing a rough idle in your 2013 Lexus IS250 is not just a matter of convenience; it is crucial for maintaining the overall health and performance of your vehicle. Ignoring this symptom can lead to serious engine problems, such as misfiring cylinders or sensor failures, which may escalate into costly repairs if left unchecked. Additionally, a rough idle can significantly impact your fuel efficiency, causing your vehicle to consume more gas than necessary, which is both wasteful and expensive. Moreover, the emissions from a poorly running engine can increase, potentially leading to environmental concerns and failing emissions tests. Lastly, the discomfort caused by vibrations during a rough idle can detract from the driving experience, affecting both you and your passengers. Therefore, it is essential to address this issue promptly to avoid further complications and ensure your Lexus IS250 operates smoothly and efficiently.

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2013 Lexus IS250 Rough Idle: Causes & Repair Costs