Hyundai Azera Has Rough Idle

Common Causes of Rough Idling in Your Hyundai Azera and How to Resolve Them

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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 Hyundai Azera 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 Hyundai Azera 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.

Troubleshooting Rough Idle in a Hyundai Azera

When troubleshooting rough idle in your Hyundai Azera, begin by checking for a vacuum leak, as this is a common culprit that can disrupt the air-fuel mixture and lead to an unstable idle. Inspect all vacuum hoses for cracks or disconnections, and consider using a smoke test to identify any hidden leaks. Next, examine the spark plugs; worn or fouled plugs can significantly affect engine performance, so ensure they are clean and properly gapped. If the spark plugs are in good condition, turn your attention to the ignition coil, as a failing coil can cause misfires and rough idling. After that, inspect the throttle body for dirt buildup, which can impede airflow and lead to erratic idling. Additionally, check the idle air control system, particularly if you encounter a P0507 code, as this component regulates the air entering the engine and is vital for maintaining a smooth idle. Finally, assess the engine control system, including the air filter and various sensors, to ensure everything is functioning correctly. By following this methodical approach, you can effectively diagnose and resolve the rough idle issue, ensuring your Hyundai Azera runs smoothly and efficiently. Regular maintenance and timely repairs will not only enhance performance but also extend the life of your vehicle.

Troubleshooting Rough Idle Issues in a Hyundai Azera

When dealing with rough idle issues in your Hyundai Azera, it's essential to understand the common problems that may be at play. One of the first areas to investigate is vacuum leaks, which can disrupt the air-fuel mixture and lead to unstable idling. Inspecting the spark plugs is also crucial, as worn or fouled plugs can cause misfires that contribute to rough idling. Additionally, testing the fuel pressure can reveal whether the fuel delivery system is functioning correctly, as inadequate pressure can lead to performance issues. Cleaning the throttle body and Mass Airflow Sensor (MAF) is another vital step, as dirt and grime can hinder engine performance. Ignition coil failures are another common culprit, often resulting in poor engine performance and increased emissions. Furthermore, checking for throttle body issues and ensuring that motor mounts are in good condition can help eliminate vibrations and shaking during idle. Lastly, don’t overlook the engine control system, as it plays a significant role in managing engine performance. If these troubleshooting steps do not resolve the rough idle, it may be time to consult a professional for a more in-depth diagnosis. Regular maintenance, including oil changes and tune-ups, can also help prevent these issues from arising in the first place.

Why is it Urgent to Address Rough Idle Issues in a Hyundai Azera?

Addressing rough idle issues in your Hyundai Azera is not just a matter of convenience; it is a critical step in maintaining the health and safety of your vehicle. When your engine exhibits rough idling, it can be a warning sign of underlying problems such as vacuum leaks, dirty throttle bodies, or faulty ignition components. Ignoring these symptoms can lead to more severe engine damage, resulting in costly repairs and potential breakdowns that could leave you stranded. Moreover, a rough idle can negatively impact your vehicle's fuel efficiency and increase harmful emissions, which not only affects your wallet but also contributes to environmental pollution. By taking prompt action to diagnose and resolve rough idle issues, you not only enhance your Hyundai Azera's performance but also ensure a safer driving experience for yourself and others on the road. Therefore, it is essential to prioritize these concerns and address them as soon as they arise.

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Hyundai Azera Rough Idle Causes & Repair Costs | RepairPal