2016 Mitsubishi Outlander Sport Has Rough Idle

Troubleshooting Causes of Rough Idle in Your 2016 Mitsubishi Outlander Sport 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 2016 Mitsubishi Outlander Sport 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 2016 Mitsubishi Outlander Sport 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 2016 Mitsubishi Outlander Sport?

When diagnosing a rough idle in a 2016 Mitsubishi Outlander Sport, 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 check for any fault codes, as these can quickly point you to specific issues within the vehicle's computer system. Next, inspect the spark plugs for wear or fouling, as these components play a crucial role in engine performance. A dirty air filter can also restrict airflow, so ensure it is clean and replace it if necessary. Following this, examine the vacuum hoses for leaks, which can disrupt the air-fuel mixture and lead to idle problems. Cleaning the throttle body is another vital step, as carbon buildup can hinder airflow. Additionally, check the idle air control valve for dirt that may affect its function, and inspect the mass airflow sensor to ensure it is measuring air intake accurately. Finally, don’t overlook the fuel system; a clogged fuel filter or dirty injectors can significantly impact engine performance. By following this structured diagnostic approach, you can effectively identify and resolve the causes of a rough idle in your vehicle.

What are the common causes of a rough idle in a 2016 Mitsubishi Outlander Sport?

When dealing with a rough idle in your 2016 Mitsubishi Outlander Sport, it's crucial to understand the common problems that could be at play. One of the first things to check is the air filter; if it's dirty or clogged, it can significantly restrict airflow to the engine, leading to performance issues. Additionally, inspect the spark plugs, as worn or faulty ones can cause misfiring, which directly contributes to a rough idle. Another area to investigate is the vacuum system for any leaks, as these can disrupt the air-fuel mixture essential for smooth engine operation. Fuel system components, including the fuel filter and injectors, should also be examined, as clogs or malfunctions here can adversely affect engine performance. Furthermore, the mass airflow sensor plays a vital role in regulating the air-fuel mixture, and if it's malfunctioning, it can lead to rough idling as well. Lastly, don’t overlook the ignition system; issues with components like the ignition coil or distributor can also result in an unstable idle. By systematically checking these areas, you can identify and address the root cause of the rough idle, ensuring your vehicle runs smoothly.

How urgent is it to address the rough idle in my 2016 Mitsubishi Outlander Sport?

Addressing a rough idle in your 2016 Mitsubishi Outlander Sport is not just a matter of comfort; it is crucial for the safety and longevity of your vehicle. A rough idle can indicate serious underlying issues, such as faulty spark plugs, fuel system malfunctions, or air intake problems, which, if left unattended, can escalate into more significant engine damage. Ignoring these symptoms may lead to decreased fuel efficiency, increased emissions, and even engine stalling while driving, posing a safety risk to you and others on the road. Moreover, the longer you wait to address the problem, the more costly the repairs may become, as minor issues can develop into major engine failures. Therefore, it is essential to prioritize diagnosing and fixing a rough idle promptly to maintain optimal performance and prevent further complications. Taking action now can save you time, money, and ensure a safer driving experience.

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