2016 Mercedes-Benz GLE350 Has A Vacuum Leak

Diagnosing Vacuum Leaks in Your 2016 Mercedes-Benz GLE350 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 Mercedes-Benz GLE350 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 Mercedes-Benz GLE350 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

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 2016 Mercedes-Benz GLE350?

To effectively diagnose a vacuum leak in your 2016 Mercedes-Benz GLE350, start with a thorough visual inspection of the engine bay. Look for any damaged or disconnected vacuum hoses, paying close attention to cracks or loose connections that could indicate a leak. Next, listen for any hissing noises while the engine is running, as these sounds often signal the location of a vacuum leak. If you have access to a smoke machine, using it can be a highly effective method; the smoke will escape from any leaks, allowing you to pinpoint the source easily. Alternatively, you can spray soapy water on the vacuum hoses and connections; if there’s a leak, the escaping air will create bubbles, making it easy to identify the problem area. Finally, monitor your engine's performance for symptoms such as rough idling, stalling, or a decrease in power, as these can also indicate issues with the vacuum system. By following this diagnostic approach, you can systematically identify and address any vacuum leaks, ensuring your vehicle operates at its best.

What are the common causes of a vacuum leak in a 2016 Mercedes-Benz GLE350?

When dealing with a vacuum leak in a 2016 Mercedes-Benz GLE350, it's crucial to understand the common problems that can arise. One of the primary culprits is cracked vacuum hoses, which can deteriorate over time due to heat and exposure, leading to air leaks that disrupt the engine's air-fuel mixture. Additionally, a leaking intake manifold gasket can create similar issues, as it seals the manifold to the engine block and any failure here can result in a loss of vacuum pressure. Throttle body gasket leaks are another frequent source of vacuum leaks, affecting the throttle body's ability to regulate airflow into the engine. Lastly, a cracked intake manifold itself can lead to significant performance issues, as it is responsible for directing air to the engine cylinders. Addressing these problems promptly is essential for maintaining optimal engine performance and preventing further complications. For DIY enthusiasts, inspecting these components regularly can help catch potential leaks early, ensuring a smoother and more efficient driving experience.

How urgent is it to repair the vacuum leak in a 2016 Mercedes-Benz GLE350?

Addressing a vacuum leak in your 2016 Mercedes-Benz GLE350 is not just a matter of convenience; it is a critical maintenance task that demands immediate attention. A vacuum leak can severely compromise engine performance, leading to symptoms such as rough idling, stalling, and a noticeable drop in fuel efficiency. These issues not only affect your driving experience but can also escalate into more serious problems if left unresolved. For instance, prolonged neglect of a vacuum leak can damage vital components like the oxygen sensors and catalytic converter, resulting in costly repairs that could have been avoided. Moreover, as the leak worsens over time, the complexity and expense of the necessary repairs will likely increase, making it imperative to act swiftly. By prioritizing the repair of a vacuum leak, you ensure the optimal performance and longevity of your vehicle, safeguarding both your investment and your safety on the road.

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