2020 Mitsubishi Mirage Has A Vacuum Leak

Diagnosing Vacuum Leaks in Your 2020 Mitsubishi Mirage: Symptoms, Causes, and Repair Solutions

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Reviewed by
Aisha
Written by RepairPal Car Genius
Updated January 14, 2025
0%
40% chance it's the
Leaking Vacuum Hoses
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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 2020 Mitsubishi Mirage 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 2020 Mitsubishi Mirage 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 a vacuum leak in a 2020 Mitsubishi Mirage?

To effectively diagnose a vacuum leak in your 2020 Mitsubishi Mirage, start with a thorough visual inspection of the vacuum hoses. Look for any signs of wear, such as cracks, holes, or loose connections that could compromise the system. Next, listen for any hissing sounds while the engine is running, as these can be telltale signs of a leak. If you have access to a vacuum gauge, connect it to the intake manifold to monitor for fluctuations or low pressure, which may indicate a problem. For a more hands-on approach, perform a spray test by applying carburetor cleaner or propane around the vacuum hoses; a change in engine RPM can confirm the presence of a leak. If you want to take it a step further, consider conducting a smoke test, where smoke is introduced into the vacuum system to visually identify escaping smoke. Finally, using an OBD-II scanner can help you check for any diagnostic trouble codes that may provide additional insights into the vacuum system's condition. By following these steps, you can systematically identify and address any vacuum leaks, ensuring your vehicle runs smoothly.

What are the common causes and symptoms of a vacuum leak in a 2020 Mitsubishi Mirage?

When tackling a vacuum leak in your 2020 Mitsubishi Mirage, it's essential to recognize the common problems that can arise. One of the primary culprits is damaged or deteriorated vacuum hoses, which can lead to loose connections and ultimately result in a loss of engine performance. Additionally, a faulty intake manifold gasket or a cracked intake manifold can create significant leaks, affecting the vehicle's efficiency. Symptoms of these issues often manifest as rough idling, stalling, or a noticeable decrease in fuel efficiency, which can be alarming for any driver. You may also notice the Check Engine Light illuminating on your dashboard, accompanied by hissing or whistling noises from the engine bay. If you experience a loss of power or acceleration, it’s crucial to investigate these symptoms promptly. Addressing a vacuum leak not only enhances your vehicle's performance but also prevents further damage, making it vital for any DIY enthusiast to be aware of these common causes and symptoms.

How urgent is it to address a vacuum leak in a 2020 Mitsubishi Mirage?

Addressing a vacuum leak in your 2020 Mitsubishi Mirage is not just a matter of convenience; it is crucial for maintaining the safety and performance of your vehicle. A vacuum leak can lead to a range of engine issues, including rough idling and stalling, which can compromise your control while driving. Additionally, a decrease in fuel efficiency means you will be spending more at the pump, which can add up over time. Ignoring these symptoms can escalate into more severe problems, potentially causing long-term damage to the engine that could require costly repairs. Therefore, it is essential to act promptly when you suspect a vacuum leak to ensure your vehicle operates smoothly and to avoid any safety hazards on the road. Taking immediate action not only preserves the integrity of your engine but also enhances your overall driving experience.

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2020 Mitsubishi Mirage Vacuum Leak Causes & Repair Costs