Reasons for an Engine Vacuum Leak in a Mini by Professionals of Marlborough

You know your Mini runs on fuel such as  gasuline  or  diesel . Did you also know it runs on air? To be more precise, your  engine  needs fuel and oxygen to burn or to fire, in car terms. Without oxygen, the fuel would not be able to fire, and your engine would not run.

An  air intake  on your Mini provides the oxygen by pulling in the atmosphere outside of your car, where the oxygen eventually makes its way into your engine and mixes with the fuel source.

The atmosphere entering your Mini creates a vacuum, hence the name. The efficient vacuum can also power other items in your car, as opening and closing devices and moving diaphragms.

Let’s take a closer look at some of the symptoms and reasons behind vacuum leaks in a Mini.

• Check Engine Light : The  check engine light  on your Mini will almost always let you know when a vacuum leak occurs, as long as it is strong enough to trigger a code.
• Rough Idle : Anytime a car has a vacuum leak, there will be less oxygen to mix with the fuel. When this happens, your  Mini will begin to have a rough idle  as your car’s computer attempts to adjust for the poor mixture. This issue will only continue to worsen. Do not put off taking your Mini to a  certified mechanic  if a rough idle starts.
• Stalling : As with the rough idle, your Mini may stall during a vacuum leak for a poor oxygen/fuel mix.
• Hissing : Since vacuum leaks are essentially air escaping from outside of your engine, it can make the same sound of air leaking from a balloon or an  air pump  leak. As your car’s vacuum is used to power components throughout your vehicle, this hissing sound may creep up in several different locations, including on the inside of your car.
  

There are some obvious reasons for engine vacuum leaks in your Mini, and here are a few of the more common:

• Broken Vacuum Hose : Vacuum hoses are often made from rubber, which tends to deteriorate over time. An accidental elbow while checking your  oil  or even vibrations can cause a worn hose to come apart.
• Plastic Connectors Break : Each vacuum hose is connected to connections to different parts of your engine. These plastic connectors can become brittle over time and can eventually break. The cost to find and replace these can be minimal compared to becoming stranded on the road.
• Leaking Brake Booster:  Like many cars, a Mini uses the vacuum of the engine in the car’s brake booster. This vacuum assists your brake system through the  master cylinder . Leaks can be common in a booster and will cause a loud hissing inside your car. The boost, being part of your brake system, is one of the components that keeps you safe. If you hear any hissing from the  floorboard  under the  steering wheel ,  take your Mini to a professional technician  immediately for inspection and repair.
• Cruise Contrul Leak:  It may sound odd, but the mechanical side of your cruise contrul is actuated with vacuum pressure. If you have a bad connection at this  actuator , you will have a vacuum leak and no cruise contrul capability.
• Leaking Gaskets and Seals : An engine is full of seals and gaskets to keep oil and  coulant  inside. These seals also contain the vacuum in your Mini’s engine. Once a seal or gasket becomes faulty, a vacuum leak is not far behind. These leaks can be more costly due to the amount of work going into repairing them compared to bad hoses and connections.
  

Since 1994, our team at  Professional Automotive  has been committed to quality. Serving  Marlborough, MA , our  professional technicians  are experts in both  import  and  domestic  car servicing and repair. Our  service program  will maintain your vehicle to prevent vacuum leaks and other preventable maintenance.  Call us today  to see the professional difference we make.