2015 INFINITI Q60 Has Rough Idle

Troubleshooting Causes of Rough Idle in Your 2015 INFINITI Q60 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 2015 INFINITI Q60 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 2015 INFINITI Q60 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 2015 INFINITI Q60?

To effectively diagnose a rough idle in your 2015 INFINITI Q60, 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 pinpoint specific issues affecting engine performance. Next, inspect the spark plugs for wear or fouling, since these components play a crucial role in engine combustion. A clean air filter is essential for optimal airflow, so ensure it is free from debris. Additionally, examine the vacuum hoses for any signs of damage or leaks, as these can significantly impact idle quality. Moving on, assess the fuel system, including the fuel filter and injectors, to rule out any fuel delivery problems. The mass airflow sensor is another critical component; testing it can help determine if it’s accurately measuring air intake. Finally, don’t overlook the throttle body, as carbon buildup can hinder its function and contribute to rough idling. By following this structured diagnostic approach, you can efficiently identify and address the underlying causes of a rough idle in your vehicle.

What are the common causes of a rough idle in a 2015 INFINITI Q60?

When diagnosing a rough idle in your 2015 INFINITI Q60, it's crucial to consider several common problems that could be at play. 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 issue is vacuum leaks; these can disrupt the delicate balance of the air-fuel mixture, resulting in an unstable idle. Fuel system problems, such as a clogged fuel filter or a malfunctioning fuel pump, 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 issue. Lastly, don't overlook the Exhaust Gas Recirculation (EGR) valve, as a faulty EGR can interfere with the combustion process, leading to rough idling. Addressing these issues promptly is essential for maintaining the optimal performance of your vehicle.

How urgent is it to address the rough idle in my 2015 INFINITI Q60?

Addressing a rough idle in your 2015 INFINITI Q60 is crucial for maintaining the vehicle's overall health and performance. Ignoring this symptom can lead to a cascade of problems, including decreased fuel efficiency and engine misfires, which not only affect your driving experience but can also escalate into more severe engine damage over time. A rough idle may indicate issues such as dirty fuel injectors, a clogged air filter, or malfunctioning spark plugs, all of which require timely attention to prevent costly repairs down the line. Moreover, neglecting these symptoms can compromise your vehicle's safety and reliability, making it essential to diagnose and resolve the issue as soon as possible. By prioritizing regular maintenance and addressing a rough idle promptly, you can ensure your INFINITI Q60 runs smoothly and efficiently, ultimately saving you time and money in the long run.

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