2014 Mitsubishi Lancer Has Rough Idle

Common Causes of Rough Idling in Your 2014 Mitsubishi Lancer and How to Resolve Them

Find Repair Location
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 Mitsubishi Lancer 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 Mitsubishi Lancer 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.

Customers with drum brake systems often specify they have lost braking power, or that the vehicle's brakes are making noise. This is because brake drums do not dissipate heat very well, so the heat from hard braking will cause stress fractures. These fractures make can make noise on the brake shoes as the drum revolves around the shoes. Lastly, the brake shoes may not be problematic, but may cause a grinding noise while stopping. This would indicate the shoes have no braking material left, and the brake shoes must be changed before the vehicle can be safely driven.

Learn more about brake shoe symptoms

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 Mitsubishi Lancer?

When diagnosing a rough idle in a 2014 Mitsubishi Lancer, it's essential to adopt a systematic approach that prioritizes simpler checks before delving into more complex diagnostics. Start by using an OBD-II scanner to identify any fault codes from the engine control unit (ECU), as these codes can provide immediate insights into potential issues. Next, inspect the spark plugs for wear or fouling, as these components play a crucial role in engine performance. A clean air filter is also vital; ensure it is free from dirt and clogs that could restrict airflow. Following this, examine the vacuum hoses for any signs of damage or disconnection, as these can significantly impact engine operation. Testing the mass airflow sensor (MAF) is another critical step, as a malfunctioning MAF can disrupt the air-fuel mixture. Additionally, inspect the throttle body for carbon buildup, which can hinder airflow and affect idle quality. Don’t overlook the fuel system; check the fuel filter, injectors, and pump to ensure proper fuel delivery. Lastly, assess the PCV valve and look for any vacuum leaks that could be contributing to the rough idle. By methodically following these steps, you can effectively diagnose and resolve the issues affecting your vehicle's performance.

What are the common causes of a rough idle in a 2014 Mitsubishi Lancer?

When dealing with a rough idle in a 2014 Mitsubishi Lancer, it's essential to understand the common problems that could be at play. One of the primary culprits is a dirty or clogged air filter, which can significantly restrict airflow to the engine, leading to performance issues. Additionally, faulty spark plugs are notorious for causing misfires, which can manifest as a rough idle. Another potential issue is vacuum leaks; these can disrupt the delicate balance of the air-fuel mixture, resulting in an unstable idle. Fuel system problems, such as clogged fuel filters or injectors, can also hinder engine performance and contribute to rough idling. Furthermore, a malfunctioning mass airflow sensor can throw off the air-fuel mixture, exacerbating the issue. Lastly, don’t overlook the ignition system; components like ignition coils or distributors that are not functioning correctly can lead to similar symptoms. By systematically checking these areas, you can effectively diagnose and address the rough idle in your Mitsubishi Lancer.

How urgent is it to address the rough idle in a 2014 Mitsubishi Lancer?

Addressing a rough idle in your 2014 Mitsubishi Lancer is not just a matter of comfort; it is crucial for the vehicle's overall health and performance. A rough idle can indicate underlying issues within the engine, such as problems with the fuel or ignition systems, or even faulty sensors. If left unattended, these symptoms can escalate, leading to decreased fuel efficiency and poor vehicle performance, which may ultimately result in costly repairs. Moreover, neglecting a rough idle can lead to more severe engine damage over time, potentially compromising your safety on the road. Regular maintenance and prompt attention to these symptoms are essential to prevent further complications and ensure that your Lancer operates smoothly and reliably. Therefore, it is imperative to address any signs of a rough idle as soon as they arise to maintain the longevity and efficiency of your vehicle.

You’ve got options with RepairPal

Whether you need a more accurate auto repair estimate or help finding a reputable shop in your area, we’ve got you covered.