2017 INFINITI Q70 Has Rough Idle

Troubleshooting Causes of Rough Idle in Your 2017 INFINITI Q70 and Solutions for a Smoother Ride

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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 2017 INFINITI Q70 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 2017 INFINITI Q70 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 initial diagnostic steps to take for a rough idle in a 2017 INFINITI Q70?

When faced with a rough idle in your 2017 INFINITI Q70, it's essential to approach the diagnosis methodically. Start by checking for fault codes using an OBD-II scanner, as these codes can reveal specific issues within the engine's systems. Next, inspect the spark plugs; ensuring they are clean and functioning properly is crucial, as worn plugs can significantly affect engine performance. Following this, examine the air filter for any blockages that could restrict airflow, which is vital for smooth engine operation. Additionally, look for vacuum leaks by inspecting hoses and connections, as these can disrupt the air-fuel mixture and lead to idling problems. Don’t forget to check the throttle body for carbon buildup, as cleaning it can often enhance idle quality. Finally, test the mass airflow sensor, as a malfunctioning sensor can also contribute to rough idling. By systematically addressing these areas, you can effectively identify and resolve the underlying causes of a rough idle in your vehicle.

What are the common causes of a rough idle in a 2017 INFINITI Q70?

When dealing with a rough idle in your 2017 INFINITI Q70, it's crucial to understand the 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. It's also important to check for vacuum leaks, as these can disrupt the delicate air-fuel mixture necessary for smooth engine operation. Fuel system issues, such as a clogged fuel filter or a malfunctioning fuel pump, can further exacerbate the problem by affecting fuel delivery. Another potential issue is a faulty mass airflow sensor, which plays a critical role in regulating the air-fuel mixture. Lastly, don't overlook the Exhaust Gas Recirculation (EGR) valve; if it's malfunctioning, it can disrupt the combustion process and lead to rough idling. By systematically addressing these areas, you can diagnose and potentially resolve the rough idle issue, ensuring your Q70 runs smoothly.

How urgent is it to address the rough idle in my 2017 INFINITI Q70?

Addressing a rough idle in your 2017 INFINITI Q70 is not just a matter of comfort; it is crucial for the overall health of your vehicle. A rough idle can indicate serious underlying problems, such as issues with the fuel system, ignition components, or even engine wear. If left unchecked, these problems can escalate, leading to more severe engine damage and costly repairs. Additionally, a rough idle often correlates with decreased fuel efficiency, which can significantly impact your wallet over time. By taking immediate action to diagnose and resolve the issue, you not only enhance your vehicle's performance but also prevent potential safety risks associated with engine malfunctions. Therefore, it is essential to prioritize this concern and consider troubleshooting or seeking professional assistance to ensure your INFINITI Q70 runs smoothly and efficiently.

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