2018 Kia Sportage Has A Vacuum Leak

Diagnosing Vacuum Leaks in Your 2018 Kia Sportage: Symptoms, Causes, and Repair Solutions

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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 2018 Kia Sportage 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 2018 Kia Sportage 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 2018 Kia Sportage?

To effectively diagnose and fix a vacuum leak in your 2018 Kia Sportage, start with a thorough visual inspection of the vacuum system. Look for any visible signs of wear, such as cracks in hoses or loose connections that could be contributing to the leak. Next, listen for any hissing sounds while the engine is running, as these can be telltale signs of escaping air. If the issue remains elusive, consider using a smoke machine, which can help pinpoint leaks by introducing smoke into the system and revealing where it escapes. Pay attention to the engine's performance; symptoms like rough idling or stalling can indicate a vacuum leak. Once you've identified the source, you can proceed with repairs by replacing any faulty components, tightening loose connections, or applying sealant to minor leaks. If the problem persists despite your efforts, it may be wise to consult a professional mechanic for further assistance. By following this diagnostic approach, you can ensure your vehicle runs smoothly and efficiently.

What are the common causes of a vacuum leak in a 2018 Kia Sportage?

When diagnosing a vacuum leak in your 2018 Kia Sportage, it's crucial to understand the common problems that can arise. One of the primary culprits is worn or damaged vacuum hoses, which can deteriorate over time due to exposure to heat and engine vibrations. Additionally, loose or improperly connected hoses can create gaps that allow air to escape, leading to performance issues. Another significant factor is the intake manifold gasket; if this component is compromised, it can result in a vacuum leak that affects engine efficiency. Similarly, a cracked or damaged intake manifold can disrupt the vacuum system, causing similar problems. Furthermore, a malfunctioning vacuum pump may fail to maintain the necessary pressure, contributing to leaks. Lastly, issues with vacuum actuators, which control various engine functions, can also lead to leaks if they are not operating correctly. By being aware of these potential issues, you can take proactive steps to inspect and maintain your vehicle, ensuring optimal performance and longevity.

How urgent is it to address a vacuum leak in a 2018 Kia Sportage?

Addressing a vacuum leak in your 2018 Kia Sportage is crucial for maintaining optimal vehicle performance and safety. A vacuum leak can lead to symptoms such as rough idling, stalling, and decreased fuel efficiency, which not only affect your driving experience but can also signal deeper issues within the engine. Ignoring these symptoms can escalate into more severe problems, potentially resulting in costly repairs and significant engine damage over time. The urgency of fixing a vacuum leak cannot be overstated, as it directly impacts the vehicle's efficiency and reliability. By taking prompt action, you can prevent further complications and ensure that your Kia Sportage operates smoothly and safely on the road. If you're experiencing any signs of a vacuum leak, it's advisable to consult a professional mechanic who can accurately diagnose and repair the issue, safeguarding your vehicle's performance and longevity.

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