2018 Dodge Charger Has Rough Idle

Fix Rough Idle in Your 2018 Dodge Charger for Smooth Performance

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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 2018 Dodge Charger 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 2018 Dodge Charger 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.

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 2018 Dodge Charger?

To effectively diagnose a rough idle in your 2018 Dodge Charger, start with the simplest solutions before progressing to more intricate checks. Begin by using an OBD-II scanner to identify any error codes that could point to the underlying issue. Next, inspect the spark plugs for signs of wear or fouling, as these can significantly impact engine performance. A clean air filter is crucial, so check for any dirt or clogs that might restrict airflow. Additionally, examine the vacuum hoses for cracks or disconnections, as these can lead to vacuum leaks that disrupt idle quality. Ensure the fuel system is operating correctly by checking the fuel pump, filter, and injectors. Cleaning the throttle body is also essential, as carbon buildup can hinder airflow. Don’t forget to test the idle air control valve for proper function, and finally, inspect the exhaust system for any leaks that could affect engine performance. By following this structured approach, you can effectively diagnose and resolve the rough idle issue in your vehicle.

What are the common problems that could cause a rough idle in a 2018 Dodge Charger?

When dealing with a rough idle in your 2018 Dodge Charger, it's essential to understand the common problems that could be at play. One of the primary culprits is dirty or faulty spark plugs, which can lead to engine misfires and an uneven idle. Additionally, a clogged fuel filter may restrict fuel flow, further exacerbating the issue. It's also crucial to check for vacuum leaks in the intake system, as these can disrupt the air-fuel mixture necessary for smooth engine operation. A malfunctioning oxygen sensor can throw off the air-fuel ratio, while issues with the mass airflow sensor can hinder proper air intake, both contributing to a rough idle. Lastly, a dirty throttle body can impede airflow, leading to similar symptoms. By regularly maintaining these components and addressing any issues promptly, you can significantly improve your vehicle's performance and eliminate rough idling.

How urgent is it to address the rough idle in a 2018 Dodge Charger?

Addressing a rough idle in your 2018 Dodge Charger is not just a matter of comfort; it is crucial for the vehicle's overall health and safety. A rough idle can indicate underlying engine problems, such as faulty spark plugs, fuel system malfunctions, or issues with the air intake. Ignoring these symptoms can lead to decreased fuel efficiency and engine misfires, which may escalate into more severe damage over time. Moreover, a rough idle can compromise your vehicle's performance, potentially putting you and others at risk on the road. By prioritizing the resolution of this issue, you not only enhance your driving experience but also safeguard your investment in the Charger. Regular maintenance and prompt attention to engine irregularities are essential for ensuring the longevity and reliability of your vehicle. Therefore, if you notice a rough idle, it is imperative to address it as soon as possible to prevent further complications and maintain the smooth operation of your Dodge Charger.

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