2010 Acura MDX Has Rough Idle

Common Causes of Rough Idling in Your 2010 Acura MDX and How to Resolve Them

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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 2010 Acura MDX 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 Acura MDX 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.

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 Acura MDX?

When addressing a rough idle in your 2010 Acura MDX, it's essential to adopt a methodical diagnostic approach that begins with the most straightforward checks. Start by using an OBD-II scanner to identify any fault codes that may indicate specific issues within the engine. This initial step can save you time and effort by directing your attention to the most likely culprits. Next, inspect the spark plugs for wear or fouling, as these components are critical for proper engine performance; replacing damaged spark plugs can significantly improve idle quality. Additionally, ensure that the air filter is clean, as a clogged filter can restrict airflow and negatively impact engine function. It's also crucial to check for vacuum leaks, which can disrupt the air-fuel mixture; inspect hoses and connections for any signs of damage. Cleaning the throttle body is another vital step, as carbon buildup can hinder its operation and contribute to a rough idle. Finally, assess the fuel system, including the fuel filter and injectors, to ensure they are functioning correctly. By following this structured approach, you can effectively diagnose and address the rough idle issue in your Acura MDX, enhancing its performance and reliability.

What are the common problems that could cause a rough idle in a 2010 Acura MDX?

When addressing a rough idle in a 2010 Acura MDX, it's crucial to identify the common problems that may be at play. A dirty or malfunctioning mass airflow sensor can significantly disrupt the air-fuel mixture, leading to an unstable idle. Similarly, a clogged fuel filter can impede fuel flow, causing the engine to struggle and resulting in rough idling. Worn or faulty spark plugs are also frequent offenders, as they can lead to misfires that manifest as an uneven idle. Additionally, vacuum leaks can introduce excess air into the engine, complicating the air-fuel mixture further. A malfunctioning oxygen sensor can adversely affect the air-fuel ratio, while issues with the Exhaust Gas Recirculation (EGR) valve can hinder the proper recirculation of exhaust gases, both contributing to a rough idle. By methodically checking and addressing these potential issues, you can effectively diagnose and resolve the rough idle problem in your Acura MDX, ensuring smoother engine performance.

How urgent is it to address the rough idle in a 2010 Acura MDX?

Addressing a rough idle in your 2010 Acura MDX should be a top priority, as neglecting this symptom can lead to serious complications. A rough idle often signals underlying problems such as a vacuum leak or an imbalance in the air/fuel mixture, which, if left unresolved, can deteriorate engine performance and lead to stalling. Moreover, ignoring this issue can result in decreased throttle response, increased fuel consumption, and even safety hazards while driving. The longer you wait to diagnose and fix the problem, the more likely you are to incur costly repairs and potentially compromise your vehicle's longevity. Therefore, it is crucial to take immediate action, whether through DIY troubleshooting or seeking professional assistance, to ensure your Acura MDX operates smoothly and safely.

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