2022 Acura MDX Has Rough Idle

Common Causes of Rough Idling in Your 2022 Acura MDX and How to Resolve Them

Find Repair Location
Reviewed by
Bo Fader
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 2022 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 2022 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 steps to diagnose a rough idle in a 2022 Acura MDX?

To effectively diagnose a rough idle in your 2022 Acura MDX, start with a systematic approach that prioritizes simpler checks before delving into more complex diagnostics. Begin by using an OBD-II scanner to check for any error codes, as these can provide immediate insights into potential issues. Next, inspect the spark plugs for signs of wear or fouling, which can significantly impact engine performance. A clean air filter is crucial for optimal airflow, so examine it for dirt or clogs and replace it if necessary. Following this, assess the fuel system components, including the fuel filter, injectors, and pump, to ensure they are functioning correctly. Don’t overlook the vacuum hoses; any leaks or cracks can lead to performance issues, so inspect them thoroughly. Cleaning the throttle body can also enhance idle quality, so consider this step if the previous checks do not resolve the issue. Additionally, perform a smoke test to identify any vacuum leaks and check the PCV valve for proper operation, as a malfunctioning valve can disrupt engine performance. Finally, ensure that coolant levels are adequate, as cooling system issues can also affect idle quality. By following this structured diagnostic approach, you can effectively identify and address the causes of a rough idle in your Acura MDX.

What are the common problems that could cause a rough idle in a 2022 Acura MDX?

When dealing with a rough idle in your 2022 Acura MDX, 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. Another potential issue is vacuum leaks; these can disrupt the delicate air-fuel mixture necessary for smooth engine operation. Fuel system problems, such as a clogged fuel filter or a malfunctioning fuel pump, can also contribute to an uneven idle by affecting fuel delivery. Furthermore, a faulty oxygen sensor can throw off the air-fuel ratio, exacerbating idle issues. Lastly, throttle body problems, including carbon buildup or a malfunctioning throttle position sensor, can lead to irregular idling. Addressing these issues promptly is essential for maintaining the performance and reliability of your vehicle, so if you notice a rough idle, consider inspecting these components or consulting a qualified mechanic for a thorough diagnosis.

How urgent is it to address the rough idle in my 2022 Acura MDX?

Addressing a rough idle in your 2022 Acura MDX is not just a matter of comfort; it is crucial for the vehicle's overall performance and longevity. A rough idle can indicate underlying engine problems, such as issues with the fuel or ignition systems, which, if left unchecked, may lead to decreased fuel efficiency and poor performance. Moreover, neglecting this symptom can escalate into more severe engine damage, resulting in costly repairs. The urgency of resolving a rough idle is heightened by the fact that it can sometimes signal serious issues that require immediate attention to prevent further complications. Regular maintenance and prompt action in addressing such symptoms are essential to ensure your vehicle remains reliable and safe on the road. Therefore, if you notice a rough idle, it is advisable to inspect your MDX as soon as possible to maintain its optimal performance and avoid potential safety risks.

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.