2014 Hyundai Tucson Has Rough Idle

Causes of Rough Idling in Your 2014 Hyundai Tucson and How to Resolve the Issue

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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 2014 Hyundai Tucson has rough idle are a vacuum leak, an issue with the spark plugs, or a problem with the ignition coil.
  • Spark Plugs: A worn or fouled spark plug can cause misfires, rough idling, and decreased fuel efficiency due to incomplete combustion.
  • 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 2014 Hyundai Tucson 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.

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.

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 2014 Hyundai Tucson?

To effectively diagnose a rough idle in your 2014 Hyundai Tucson, begin with a systematic approach that prioritizes simpler checks before delving into more complex diagnostics. Start by connecting an OBD-II scanner to check for any trouble codes, as these can provide immediate insights into potential issues. If no codes are present, inspect the vacuum lines for leaks, as even small gaps can disrupt engine performance. Next, examine the throttle body and Mass Airflow Sensor (MAF) for cleanliness and proper function, since any obstruction can hinder air-fuel mixture. Don’t overlook the spark plugs; worn or damaged plugs can lead to misfires and rough idling, so inspect and replace them if necessary. Additionally, assess the ignition coil for signs of failure, as a malfunctioning coil can cause similar symptoms. Finally, consider the condition of the fuel injectors, as inconsistent fuel delivery can also contribute to a rough idle. By following this structured diagnostic approach, you can identify and address the underlying causes of the rough idle, ensuring your Tucson runs smoothly.

What are the common causes of a rough idle in a 2014 Hyundai Tucson?

When experiencing a rough idle in your 2014 Hyundai Tucson, it's essential to consider several common problems that could be at play. A vacuum leak is often a primary culprit, as it disrupts the air-fuel mixture necessary for smooth engine operation. Additionally, issues with spark plugs or ignition coils can lead to misfires, causing the engine to shake or hesitate during idling. Worn ignition coil packs and faulty spark plug wires can exacerbate these symptoms, resulting in erratic idling and increased fuel consumption. Furthermore, a misfire during acceleration or idling can indicate deeper engine issues, such as a bad motor mount or other mechanical failures. By understanding these potential causes, DIYers can better diagnose and address the rough idle, ensuring their Tucson runs smoothly and efficiently.

How urgent is it to address the rough idle in my 2014 Hyundai Tucson?

Addressing the rough idle in your 2014 Hyundai Tucson is crucial for maintaining the vehicle's performance and safety. While it may not seem like an immediate emergency, ignoring this issue can lead to more severe problems down the line. A rough idle often indicates underlying issues such as a vacuum leak, faulty spark plugs, or malfunctioning ignition coils, which can compromise engine efficiency and increase emissions. If left unaddressed, these problems can escalate, resulting in poor engine performance, reduced fuel economy, and even starting difficulties. Moreover, unstable idle speeds can create vibrations that may affect other components of your vehicle, leading to costly repairs. Therefore, it is advisable to consult a professional mechanic as soon as you notice rough idling to prevent further complications and ensure your Hyundai Tucson operates smoothly and efficiently. Taking prompt action not only safeguards your vehicle's performance but also enhances your driving experience and safety on the road.

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2014 Hyundai Tucson Rough Idle: Causes & Repairs | RepairPal