2014 Chevrolet Impala Has Rough Idle

Troubleshooting Causes of Rough Idle in Your 2014 Chevrolet Impala 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 2014 Chevrolet Impala 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 2014 Chevrolet Impala 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 Chevrolet Impala?

To effectively diagnose a rough idle in your 2014 Chevrolet Impala, 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 can significantly affect engine performance and lead to rough idling. Next, examine the air filter; a clogged filter can restrict airflow, exacerbating idle issues. Following this, assess the fuel system components, including the fuel injectors, fuel filter, and fuel pump, as any malfunction here can disrupt the fuel delivery necessary for smooth idling. Utilizing an OBD-II scanner to check for error codes can provide insights into specific problems that may be affecting your vehicle. Additionally, inspect the PCV valve and the Idle Air Control (IAC) valve, as both play crucial roles in maintaining proper idle speed and engine function. Don’t overlook the possibility of vacuum leaks, which can disturb the air-fuel mixture, and ensure the throttle body is clean and functioning correctly. By methodically working through these steps, you can identify and resolve the underlying causes of a rough idle, ensuring your Impala runs smoothly.

What are the common problems that could cause a rough idle in a 2014 Chevrolet Impala?

When diagnosing a rough idle in a 2014 Chevrolet Impala, it's essential to consider several common problems that could be affecting the vehicle's performance. One of the primary culprits is a dirty or clogged air filter, which can significantly restrict airflow to the engine, leading to an uneven idle. Additionally, faulty spark plugs are notorious for causing misfires; if they are worn out, they can disrupt the combustion process, resulting in a rough idle. Another potential issue is vacuum leaks, which can disturb the air-fuel mixture necessary for optimal engine performance. Problems within the fuel system, such as a clogged fuel filter or a malfunctioning fuel pump, can also hinder fuel delivery, contributing to an unstable idle. Furthermore, a malfunctioning mass airflow sensor may lead to incorrect air-fuel ratios, exacerbating the rough idle condition. Lastly, issues with the Exhaust Gas Recirculation (EGR) valve can impact engine performance at idle, making it crucial to inspect this component as well. By addressing these common problems through regular maintenance and timely repairs, you can effectively resolve rough idle issues and enhance the overall performance of your Impala.

How urgent is it to address the rough idle in a 2014 Chevrolet Impala?

Addressing a rough idle in your 2014 Chevrolet Impala should be treated with urgency, as it can signal various underlying problems that, if ignored, may escalate into more severe issues. Symptoms such as vacuum leaks, poor fuel quality, or carbon buildup can lead to decreased throttle response and overall vehicle performance. Ignoring these signs not only risks further damage to engine components but can also compromise your safety on the road. A rough idle can affect how your vehicle responds during critical driving situations, making it essential to diagnose and repair the issue promptly. By taking action now, you can prevent costly repairs down the line and ensure your Impala operates smoothly and reliably. Therefore, it is advisable to consult a qualified mechanic to accurately identify the cause of the rough idle and implement the necessary repairs, safeguarding both your vehicle's performance and your safety.

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