2011 INFINITI G25 Has Rough Idle

Troubleshooting Causes of Rough Idle in Your 2011 INFINITI G25 and Solutions for a Smoother Ride

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Reviewed by
Andrew Hajjar
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 2011 INFINITI G25 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 2011 INFINITI G25 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 2011 INFINITI G25?

When faced with a rough idle in your 2011 INFINITI G25, it's essential to adopt a systematic diagnostic approach to identify and resolve the issue effectively. Start by checking for fault codes using an OBD-II scanner, as these codes can reveal specific problems within the engine's systems. Next, inspect the spark plugs for wear or fouling, as these components play a crucial role in engine performance. A clean air filter is also vital; ensure it is free from dirt and debris to maintain proper airflow. Additionally, examine vacuum hoses for leaks, which can disrupt the air-fuel mixture and lead to idle issues. Don't overlook the throttle body; cleaning it of any carbon buildup can significantly improve idle quality. Finally, test the mass airflow sensor, as a malfunctioning sensor can directly impact engine performance. By following this structured approach, you can effectively diagnose and address the rough idle in your vehicle, ensuring a smoother driving experience.

What are the common causes of a rough idle in a 2011 INFINITI G25?

When dealing with a rough idle in your 2011 INFINITI G25, it's crucial to consider several common problems that could be at play. One of the first things to check is the air filter; a dirty or clogged air filter can significantly restrict airflow to the engine, leading to performance issues. Additionally, inspect the spark plugs, as worn or faulty plugs can cause misfiring, which directly affects idle quality. Another area to investigate is the vacuum system for any leaks, as these can disrupt the air-fuel mixture and result in an unstable idle. Fuel system components, including the fuel filter and fuel pump, should also be examined, as clogs or malfunctions can hinder engine performance. Furthermore, the Mass Airflow Sensor (MAF) plays a critical role in regulating the air-fuel mixture, and a malfunction here can lead to rough idling. Lastly, the Idle Air Control Valve (IACV) is essential for maintaining the correct idle speed; if it's faulty, it can cause erratic idling. By systematically checking these components, you can effectively diagnose and address the rough idle issue in your vehicle.

How urgent is it to address the rough idle in a 2011 INFINITI G25?

When dealing with a rough idle in your 2011 INFINITI G25, it's crucial to recognize the urgency of the situation. A rough idle can signal various underlying issues, such as dirty fuel injectors, a clogged air filter, or malfunctioning spark plugs, which, if ignored, may escalate into more severe problems. Not only can neglecting these symptoms lead to decreased fuel efficiency and engine misfires, but it can also result in significant damage to other engine components, ultimately costing you more in repairs. For DIY enthusiasts, addressing these issues promptly can save time and money while ensuring your vehicle runs smoothly. Regular maintenance, such as cleaning fuel injectors and replacing air filters, can prevent these problems from worsening. However, if the rough idle persists despite your efforts, consulting a qualified mechanic is advisable to accurately diagnose and resolve the issue, ensuring the longevity and performance of your vehicle.

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