Mitsubishi Outlander Sport Has Rough Idle

Diagnosing Causes of Rough Idle in Your 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 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 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.

Brake caliper failure occurs in two different ways, and they create different symptoms.

The caliper can become stuck, in which case it won't release the brake pads. The seized caliper will cause the vehicle to brake constantly on one side, forcing the car to move toward that side. This pulling will be accompanied by a strong odor from one wheel.

Another way calipers fail is by leaking. If the caliper leaks, the brake pedal will feel too easy to push, and will sink all the way to the floor when held. Braking will become less effective the longer this goes on. There may also be brake fluid leaking onto the wheel.

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.

Troubleshooting Rough Idle in a Mitsubishi Outlander Sport

When troubleshooting a rough idle in your Mitsubishi Outlander Sport, it's essential to adopt a systematic diagnostic approach that begins with the simplest solutions before progressing to more complex issues. Start by checking for vacuum leaks, as these can significantly affect engine performance and are often easy to identify. Next, ensure that the throttle body and Mass Air Flow (MAF) sensor are clean, as dirt and debris can disrupt airflow and lead to rough idling. Inspect the spark plugs for any signs of wear or damage, as faulty spark plugs can cause misfires and uneven engine operation. Additionally, testing the fuel pressure is crucial to confirm that it falls within the manufacturer's specified range, as inadequate fuel delivery can also contribute to idle issues. If the rough idle is intermittent, consider examining electrical components such as the distributor and wiring, as these can lead to sporadic performance problems. Lastly, be aware that clogged catalytic converters and a rich fuel mixture can exacerbate rough idling, leading to further complications. By following this structured approach, you can effectively diagnose and resolve the rough idle in your vehicle, ensuring a smoother driving experience.

Troubleshooting Rough Idle in Mitsubishi Outlander Sport

When dealing with a rough idle in your Mitsubishi Outlander Sport, it's essential to understand the common problems that could be at play. One frequent culprit is a vacuum leak, which can disrupt the air-fuel mixture and lead to an unstable idle. Inspecting the vacuum lines for any cracks or disconnections can often reveal the issue. Another area to check is the spark plugs; worn or fouled plugs can hinder engine performance, so replacing them with properly gapped new ones can make a significant difference. Additionally, the ignition coil should be tested, as a malfunctioning coil can lead to misfires and rough idling. If these components are functioning correctly, consider examining the catalytic converter for blockages, as a clogged converter can restrict exhaust flow and affect engine performance. Furthermore, an incorrect air-fuel mixture can also cause rough idling, so monitoring exhaust emissions for signs of richness can help you adjust the mixture accordingly. Lastly, the idle control valve is crucial for maintaining a steady idle speed; cleaning or replacing a faulty valve can resolve many idling issues. By systematically addressing these common problems, you can effectively troubleshoot and restore smooth operation to your Mitsubishi Outlander Sport.

Why is a Rough Idle in a Mitsubishi Outlander Sport Urgent to Address?

A rough idle in your Mitsubishi Outlander Sport is not just an annoyance; it signals potential underlying problems that require immediate attention. Ignoring this symptom can lead to more severe mechanical issues, which may escalate repair costs significantly over time. Additionally, a rough idle often correlates with decreased fuel efficiency, meaning you could be spending more at the pump without realizing it. The strain on engine components from a rough idle can also result in premature wear, ultimately shortening the lifespan of your vehicle. By addressing this issue promptly, you not only enhance the performance and drivability of your Outlander Sport but also ensure a safer driving experience for everyone on board. Therefore, if you notice your vehicle idling roughly, it’s crucial to investigate and resolve the issue as soon as possible to maintain its health and performance.

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