2013 Cadillac XTS Has Rough Idle

Troubleshooting Causes of Rough Idle in Your 2013 Cadillac XTS and How to Resolve Them

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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 2013 Cadillac XTS 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 Cadillac XTS 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 Cadillac XTS?

To effectively diagnose a rough idle in your 2013 Cadillac XTS, 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 issues. Next, inspect the spark plugs for wear or fouling, as they play a crucial role in engine performance. A clean air filter is essential for optimal airflow, so examine it for dirt or clogs and replace it if necessary. Don’t overlook the vacuum hoses; any cracks or disconnections can lead to performance issues, so ensure they are intact. The fuel system is another critical area; check the fuel filter and injectors for clogs that could affect the idle. Additionally, test the mass airflow sensor, as a malfunction here can disrupt the air-fuel mixture. Finally, inspect and clean the throttle body, as a dirty throttle can significantly impact idle quality. By following this structured diagnostic approach, you can efficiently identify and resolve the cause of a rough idle in your Cadillac XTS.

What are the common problems that could cause a rough idle in a 2013 Cadillac XTS?

When dealing with a rough idle in your 2013 Cadillac XTS, it's crucial to understand the common problems that may be at play. Start by checking the spark plugs, as dirty or faulty ones can cause misfiring, which directly affects idle quality. Next, inspect the fuel injectors; if they are clogged, they can disrupt the necessary fuel-air mixture, leading to an uneven idle. Additionally, look for any vacuum leaks in the engine, as these can create an imbalance in the air-fuel ratio. The mass airflow sensor is another critical component; if it's faulty, it can hinder the engine's air intake, resulting in a rough idle. Don't overlook the EGR valve, as issues here can also impact engine performance. Lastly, a malfunctioning oxygen sensor can affect both fuel efficiency and idle stability. By systematically checking these components, you can identify and address the root cause of the rough idle, ensuring your Cadillac XTS runs smoothly.

How urgent is it to address the rough idle in a 2013 Cadillac XTS?

Addressing a rough idle in your 2013 Cadillac XTS should not be overlooked, as it can indicate deeper mechanical issues that may escalate if left unattended. While it may not seem like an immediate emergency, the symptoms of a rough idle can lead to significant problems, including decreased fuel efficiency and potential engine damage. Ignoring these signs can compromise your vehicle's drivability and safety, making it crucial to diagnose and resolve the issue promptly. Regular maintenance and timely repairs not only enhance the longevity of your Cadillac but also prevent more costly repairs in the future. Therefore, if you notice a rough idle, it is advisable to investigate the cause and take action to ensure your vehicle remains reliable and performs optimally.

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2013 Cadillac XTS Rough Idle Causes & Repair Costs