2005 Acura RSX Has Rough Idle

Troubleshooting Causes of Rough Idle in Your 2005 Acura RSX and How to Restore Smooth Performance

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Reviewed by
Aisha
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 2005 Acura RSX 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 2005 Acura RSX 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 2005 Acura RSX?

To effectively diagnose a rough idle in your 2005 Acura RSX, start with a systematic approach that prioritizes simpler checks before delving into more complex diagnostics. Begin by inspecting the spark plugs, as worn or damaged plugs are a common culprit for rough idling. Next, examine the air filter; a clogged filter can disrupt the air-fuel mixture, leading to performance issues. Following this, assess the fuel system components, including the fuel injectors and fuel filter, to ensure they are functioning properly. Utilizing an OBD-II scanner can help identify any error codes that may indicate specific problems. Additionally, check the idle air control valve, as a malfunction here can significantly affect idle quality. Don’t overlook the possibility of vacuum leaks; inspect hoses and connections thoroughly. Finally, evaluate the throttle body and the engine coolant temperature sensor, as well as the mass airflow sensor, since any of these components can impact the engine's performance and contribute to a rough idle. By methodically working through these checks, you can effectively identify and address the underlying issues affecting your vehicle's idle.

What are the common causes of a rough idle in a 2005 Acura RSX?

When diagnosing a rough idle in a 2005 Acura RSX, it's essential to explore several common problems that may be affecting engine performance. A dirty or clogged air filter can significantly restrict airflow, leading to an uneven idle. Additionally, worn or faulty spark plugs are known to cause misfires, which can contribute to a rough idle experience. Vacuum leaks are another critical factor; they can disrupt the air-fuel mixture necessary for smooth engine operation. Issues within the fuel system, such as clogged fuel filters or injectors, can further complicate matters by hindering proper fuel delivery. Furthermore, a malfunctioning Idle Air Control Valve (IACV) can result in irregular idle speeds, while carbon buildup or other malfunctions in the throttle body can impede airflow, exacerbating the rough idle. Timely identification and resolution of these issues are vital for ensuring the optimal performance and reliability of your Acura RSX.

How urgent is it to address the rough idle in my 2005 Acura RSX?

Addressing a rough idle in your 2005 Acura RSX is not just a matter of comfort; it is crucial for the overall health of your vehicle. Ignoring this symptom can lead to a cascade of problems, including decreased fuel efficiency and potential engine damage, which can escalate repair costs significantly. A rough idle often indicates underlying issues that, if left unresolved, may worsen over time, leading to more severe mechanical failures. Moreover, a poorly running engine can compromise your vehicle's safety and reliability, making it essential to act promptly. By prioritizing the resolution of a rough idle, you not only enhance your driving experience but also safeguard your investment in the long run. Therefore, if you notice your Acura RSX idling roughly, it is imperative to diagnose and address the issue as soon as possible to prevent further complications and ensure optimal performance.

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