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Vacuum Leak

Online Auto Repair Manuals - Vacuum Leak

ALLData: Do It Yourself Auto Repair Manuals


Information

What is a vacuum leak?

An engine vacuum leak allows unmetered air to get into the engine without going through the air flow meter and can cause the fuel computer to set up the wrong air and fuel mixture ratio. This usually means there’s a leaky hose.

What about those hissing noises coming from my engine?

Even experienced mechanics have been fooled by the symptoms of an engine vacuum leak. An engine vacuum leak may be the obvious answer if the engine is making a whistling or hissing sound. Unfortunately, it’s not always that easy to diagnose, since a leak can also disguise itself as a fuel or ignition problem. Other symptoms can include inconsistent idling speeds, stalling, hesitation, or misfiring.

What are my options?

Although an owner may be able to diagnose and repair some problems, vacuum leaks can be difficult to pinpoint, and the vehicle may need to be taken to an auto repair shop. There are websites that advertise auto repair services and/or sell parts. Other sites offer free diagnostic instructions, and service manuals can also be purchased online.