2010 INFINITI M35 Has Rough Idle

Troubleshooting Causes of Rough Idle in Your 2010 INFINITI M35 and Solutions for a Smoother Ride

Find Repair Location
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 2010 INFINITI M35 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 2010 INFINITI M35 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 2010 INFINITI M35?

To effectively diagnose a rough idle in your 2010 INFINITI M35, start with the simplest and most accessible checks. Begin by using an OBD-II scanner to retrieve any fault codes from the vehicle's computer; these codes can quickly point you toward specific issues. Next, inspect the spark plugs for wear or fouling, as these can significantly impact engine performance. Following this, examine the ignition system, including coils and wires, to ensure they are functioning correctly, as faulty components here can also lead to a rough idle. Don’t overlook the air intake system; check the air filter for clogs and inspect for any leaks that could disrupt the air-fuel mixture. Additionally, assess the fuel system by looking at the fuel injectors, filter, and pump for any signs of malfunction. Finally, inspect the vacuum hoses for cracks or leaks, as these can adversely affect engine performance. By methodically working through these steps, you can identify and address the root causes of the rough idle, ensuring your vehicle runs smoothly.

What are the common problems that could cause a rough idle in a 2010 INFINITI M35?

When diagnosing a rough idle in a 2010 INFINITI M35, it's essential to consider several common problems that could be affecting the vehicle's performance. One of the primary culprits is a dirty or faulty mass airflow sensor, which can disrupt the delicate balance of the air-fuel mixture necessary for smooth engine operation. Additionally, vacuum leaks can lead to an improper air-fuel ratio, exacerbating idle issues. Worn-out spark plugs or malfunctioning ignition coils may also contribute to misfires, resulting in a rough idle. Another potential issue is a clogged fuel filter, which restricts fuel flow and can significantly impact engine performance at idle. Furthermore, problems with the idle air control valve can disrupt the engine's idle speed, while a dirty or malfunctioning throttle body can hinder airflow into the engine. By systematically addressing these common issues, DIY enthusiasts can effectively troubleshoot and potentially resolve the rough idle problem, restoring the vehicle's smooth operation.

How urgent is it to address the rough idle in my 2010 INFINITI M35?

Addressing a rough idle in your 2010 INFINITI M35 is crucial for maintaining the vehicle's overall health and performance. A rough idle can signal various underlying problems, such as dirty fuel injectors, a clogged air filter, or faulty spark plugs, which, if ignored, may lead to more severe issues like engine misfires or decreased fuel efficiency. The urgency of resolving this issue cannot be overstated, as neglecting it could result in significant damage to other engine components, ultimately leading to costly repairs. For DIY enthusiasts, it’s essential to conduct regular maintenance checks and consider troubleshooting these symptoms promptly. By doing so, you not only enhance your vehicle's performance but also ensure its longevity, making it a worthwhile endeavor to address any signs of a rough idle as soon as they arise.

You’ve got options with RepairPal

Whether you need a more accurate auto repair estimate or help finding a reputable shop in your area, we’ve got you covered.