2016 Mitsubishi Outlander Has A Vacuum Leak

Diagnosing Vacuum Leaks in Your 2016 Mitsubishi Outlander and Effective Repair Strategies

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Reviewed by
Devin Cabugcal
Written by RepairPal Car Genius
Updated January 14, 2025
0%
40% chance it's the
Leaking Vacuum Hoses
0%
30% chance it's the
Leaking Gaskets and Seals
0%
20% chance it's the
Bad Actuators and Valves
0%
10% chance it's
Something else
The most common reasons a 2016 Mitsubishi Outlander has a vacuum leak are leaking vacuum hoses, leaking gaskets and seals, or bad actuators and valves.
  • Leaking Vacuum Hoses: A cracked or disconnected vacuum hose can lead to a loss of engine vacuum, resulting in poor engine performance and increased fuel consumption.
  • Leaking Gaskets and Seals: Aged or damaged gaskets and seals can lead to fluid leaks, resulting in loss of engine oil or coolant and potential engine damage.
  • Bad Actuators and Valves: A malfunctioning actuator or valve can disrupt the proper operation of the vehicle's systems, leading to issues such as poor engine performance or erratic behavior of components like the HVAC system.
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 has a vacuum leak?

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.

Problems with the intake manifold gasket can create the following symptoms:

  • Illuminated check engine light
  • Erratic engine performance
  • Oil and coolant leaks
  • Poor gas mileage
  • Stalling

» LEARN MORE: Intake manifold gasket symptoms

Rough idling, lack of power, engine oil leaks, engine burning oil, and illumination of the check engine light are all possible if the PCV valve has clogged. If the check engine light comes on, the on-board diagnostics (OBD) trouble codes will most likely relate to manifold vacuum, air and fuel mixture, PCV system, mass airflow sensor readings, and exhaust and emissions readings. These are all affected in the event the PCV valve is clogged, is stuck fully open, or is stuck fully closed, however, if the valve is stuck fully open, the engine oil seals are not in danger of overpressure.

A bad valve cover gasket will result in an oil leak. You may notice oil under the car or on other parts under the hood. You might also notice a burning smell while driving.

» LEARN MORE: Signs of a bad valve cover gasket

Any time there is an emissions fault the check engine light will be displayed. The purpose of the check engine light is to inform the driver that an emission related fault has been found, and that there are on-board diagnostic (OBD) trouble codes stored in the powertrain or engine control module. Additionally, since the emissions systems are so intertwined into engine control and transmission control systems, symptoms may include nearly any sort of drivability concerns. This may include harsh shifting, failure to shift, hesitation on acceleration, jerking, engine failure to start or run, loss of power, or any number of other drivability issues.

What are the steps to diagnose and fix a vacuum leak in a 2016 Mitsubishi Outlander?

To effectively diagnose and fix a vacuum leak in your 2016 Mitsubishi Outlander, start with a thorough visual inspection of the vacuum system. Look for any visible signs of wear, such as cracks or disconnections in the hoses. Next, start the engine and listen for any hissing sounds, which can indicate the presence of a leak. If you have access to a smoke machine, this can be a highly effective tool for pinpointing leaks; simply introduce smoke into the vacuum system and observe where it escapes. Pay attention to your vehicle's performance as well; symptoms like rough idling or stalling can signal a vacuum leak. Once you have identified the source of the leak, replace any damaged hoses and check gaskets and seals for integrity. If the issue persists, using a vacuum gauge can help you locate the leak more precisely. Should you find yourself unable to resolve the issue, don’t hesitate to consult a professional mechanic for assistance. By following this structured approach, you can ensure your Outlander runs smoothly and efficiently.

What are the common problems associated with vacuum leaks in a 2016 Mitsubishi Outlander?

When it comes to vacuum leaks in a 2016 Mitsubishi Outlander, several common problems can significantly impact the vehicle's performance. One of the most noticeable symptoms is rough idling, which occurs when the engine struggles to maintain a steady RPM while stationary, often felt at stop signs or traffic lights. Additionally, vacuum leaks can lead to decreased fuel efficiency, as the engine compensates for the excess air entering the system, resulting in a leaner fuel mixture. This inefficiency not only affects your wallet but can also trigger the check engine light, alerting you to a potential issue that requires immediate attention. Furthermore, a vacuum leak can cause a loss of power, making acceleration sluggish and unresponsive, particularly during demanding driving conditions. In severe cases, the engine may even stall, especially at low speeds or when coming to a stop, posing safety risks. To maintain optimal performance and prevent further damage, it is crucial to address vacuum leaks promptly through regular maintenance and inspections, allowing DIY enthusiasts to keep their Outlander running smoothly.

How urgent is it to repair a vacuum leak in a 2016 Mitsubishi Outlander?

Repairing a vacuum leak in your 2016 Mitsubishi Outlander is not just a matter of convenience; it is crucial for maintaining the vehicle's performance and safety. A vacuum leak can lead to a range of problems, including rough idling, stalling, and decreased power, which can significantly affect your driving experience. Moreover, if left unaddressed, a vacuum leak can cause further damage to other engine components, resulting in more extensive and costly repairs down the line. By addressing the leak promptly, you not only enhance your vehicle's fuel efficiency but also ensure smoother operation and longevity of the engine. Therefore, it is essential to prioritize the repair of a vacuum leak to avoid potential safety risks and maintain the overall health of your Outlander.

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