Nissan Pathfinder Has Rough Idle

Common Causes of Rough Idling in Your Nissan Pathfinder and How to Resolve Them

Find Repair Location
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 Nissan Pathfinder 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 Nissan Pathfinder 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.

Brake caliper failure occurs in two different ways, and they create different symptoms.

The caliper can become stuck, in which case it won't release the brake pads. The seized caliper will cause the vehicle to brake constantly on one side, forcing the car to move toward that side. This pulling will be accompanied by a strong odor from one wheel.

Another way calipers fail is by leaking. If the caliper leaks, the brake pedal will feel too easy to push, and will sink all the way to the floor when held. Braking will become less effective the longer this goes on. There may also be brake fluid leaking onto the wheel.

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.

Brake rotors are mainly maintenance free, but when they have been subjected to abnormally hard use, the heat they absorb can cause the metal to turn blue, and cracking to occur. When this occurs, customers often specify they have lost braking power, or the vehicle's brakes are making noise. There may be no symptoms at all related to changing the brake rotors, since it is recommended to change brake rotors on most modern vehicles when performing a standard brake service.

Customers with drum brake systems often specify they have lost braking power, or that the vehicle's brakes are making noise. This is because brake drums do not dissipate heat very well, so the heat from hard braking will cause stress fractures. These fractures make can make noise on the brake shoes as the drum revolves around the shoes. Lastly, the brake shoes may not be problematic, but may cause a grinding noise while stopping. This would indicate the shoes have no braking material left, and the brake shoes must be changed before the vehicle can be safely driven.

Learn more about brake shoe symptoms

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.

Troubleshooting Rough Idle in a Nissan Pathfinder

When troubleshooting rough idle in your Nissan Pathfinder, it's essential to adopt a methodical diagnostic approach. Start by checking for vacuum leaks, as these can significantly disrupt the air-fuel mixture, leading to an unstable idle. Inspect all vacuum hoses and connections for any signs of wear or damage. Next, turn your attention to the air intake system; a clean air filter and a properly functioning mass airflow sensor are crucial for optimal engine performance. If these components are in good shape, examine the fuel system for potential issues such as a clogged fuel filter or malfunctioning fuel injectors, which can also contribute to rough idling. Don’t overlook the spark plugs; ensure they are not worn out or fouled, as this can directly affect engine performance. Additionally, check the ignition system, including ignition coils and wires, to confirm they are operating correctly. The EGR valve is another critical component to inspect, as a malfunction here can lead to idle issues. Finally, using an OBD-II scanner can help you identify any error codes that may point to specific problems. By following this structured approach, you can effectively diagnose and address the rough idle in your Nissan Pathfinder, ensuring a smoother driving experience. If the issue persists after these checks, seeking professional assistance may be necessary for a more in-depth analysis.

Troubleshooting Rough Idle Issues in a Nissan Pathfinder

When dealing with rough idle issues in your Nissan Pathfinder, it's essential to understand the common problems that may be at play. One of the primary culprits is a vacuum leak, which can disrupt the air-fuel mixture and lead to an unstable idle. Additionally, worn or faulty spark plugs can hinder engine performance, making it crucial to inspect and replace them if necessary. The ignition coil is another vital component; if it's malfunctioning, it can cause misfires that contribute to rough idling. Don't overlook the condition of your motor mounts, as a failing mount can transmit engine vibrations to the chassis, affecting idle smoothness. Furthermore, maintaining the right balance of air, fuel, and spark is critical for optimal engine performance; any imbalance can result in rough idling. A dirty or faulty Mass Airflow Sensor (MAF) can also disrupt this balance, so cleaning or replacing it may be necessary. Lastly, consider cleaning the throttle body, as carbon buildup can impede airflow and affect idle quality. By systematically addressing these common issues, you can effectively troubleshoot and resolve rough idle problems in your Nissan Pathfinder, ensuring a smoother driving experience.

Why is a Nissan Pathfinder Idling Rough and What Should You Do?

When your Nissan Pathfinder is idling rough, it’s crucial to address the issue without delay. Ignoring symptoms like a shaky idle can lead to more severe problems, including engine damage or decreased fuel efficiency. A malfunctioning Mass Air Flow (MAF) sensor or a faulty Throttle Position Sensor (TPS) can disrupt the air-fuel mixture, causing the engine to struggle. Additionally, carbon buildup can hinder performance, making it essential to consider cleaning or de-carboning the engine as part of your maintenance routine. Performing an Idle Air Volume Learn (IAVL) can also help stabilize the idle air volume, enhancing overall engine performance. By taking these steps promptly, you not only improve your vehicle's functionality but also prevent potential safety risks associated with engine malfunctions. Addressing a rough idle early on can save you from costly repairs down the line, ensuring your Pathfinder runs smoothly and efficiently.

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.