2017 Ford Mustang Has A Vacuum Leak

Diagnosing Vacuum Leaks in Your 2017 Ford Mustang: Symptoms, Causes, and Repair Solutions

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Reviewed by
Bo Fader
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 2017 Ford Mustang 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 2017 Ford Mustang 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 2017 Ford Mustang?

When diagnosing a vacuum leak in a 2017 Ford Mustang, it's essential to adopt a systematic approach that begins with the simplest methods before progressing to more complex diagnostics. Start with a thorough visual inspection of the engine bay, focusing on vacuum hoses and components for any visible damage or disconnections. This initial step can often reveal obvious issues that are easy to fix. Next, listen for any hissing noises while the engine is running, as these sounds can indicate the presence of a leak. If the source remains elusive, consider using a smoke machine to introduce smoke into the vacuum system; the escaping smoke will clearly highlight the leak's location. Alternatively, spraying soapy water on the hoses can also help, as bubbles will form at the site of a leak. Pay attention to the engine's performance, noting any irregularities such as rough idling or stalling, which can further suggest a vacuum leak. Finally, for a more technical assessment, connect a vacuum gauge to the intake manifold to check for abnormal readings. By following this structured diagnostic approach, you can effectively identify and address vacuum leaks in your Mustang, ensuring optimal engine performance.

What are the common problems associated with vacuum leaks in a 2017 Ford Mustang?

When it comes to vacuum leaks in a 2017 Ford Mustang, several common problems can significantly affect the vehicle's performance. One of the most noticeable symptoms is rough idling, where the engine may shake or vibrate while at a standstill, indicating an imbalance in the air-fuel mixture. This imbalance can also lead to decreased fuel efficiency, as the engine struggles to maintain optimal performance, resulting in higher fuel consumption. Additionally, a vacuum leak often triggers the check engine light, serving as a warning that something is amiss and requires immediate attention. Drivers may also experience a loss of power or acceleration, which can be particularly concerning during driving. In severe cases, vacuum leaks can cause the engine to stall unexpectedly, posing safety risks on the road. To prevent these issues, regular maintenance and inspections are essential, allowing Mustang owners to address potential vacuum leaks before they escalate into more significant problems.

How urgent is it to repair a vacuum leak in a 2017 Ford Mustang to prevent safety risks and engine damage?

Repairing a vacuum leak in your 2017 Ford Mustang is not just a matter of routine maintenance; it is an urgent necessity that can significantly impact both safety and engine performance. A vacuum leak can lead to a range of performance issues, including rough idling and stalling, which can make your vehicle unpredictable and difficult to control. More critically, such leaks can compromise the braking system, potentially endangering your safety on the road. Ignoring these symptoms can result in severe engine damage over time, leading to costly repairs that could have been easily avoided with prompt attention. By addressing a vacuum leak as soon as it is detected, you not only enhance the performance and efficiency of your Mustang but also ensure a safer driving experience. Therefore, if you suspect a vacuum leak, it is imperative to act quickly to maintain the health of your vehicle and protect yourself and others on the road.

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