Best way to look for Vaccum Leaks?

[GTFIRE]

Im sure anyone that has a Ford has experienced some sort of Vaccum problem...not bashing Fords at all..thats all I drive and all I will drive but every car ive had has had vaccum issues....what is the best way to detect for vaccum leaks?
Thanks
nick

 

[mrboyle]

Carb cleaner! Spray carb cleaner on anywhere that a vacuum leak could occur. If the leak is significant enough that you can hear it, when the carb cleaner hits the leak you will hear a change in the sound and typically the engine RPM will drop. If you can't hear the leak you will need to listen for any fluctuation in RPM to indicate where the leak is. The one thing to remember is that this isn't an exact science and if you have a stubborn leak it will be a test of patience to find.

 

[Charlie]

Take a propane torch, turn the gas on, but do not light it. Then move it around the possible areas for the vacuum leak. The engine revs will increase when the propane is sucked into the system.

 

[PTBishop]

Although both methods above work, they can also be dangerous. When looking for a vacuum leak use water in a spray, or mister bottle, spray suspected areas, or vacuums lines whatever you want to do, If the engine dies, there's your leak...The key is to spray not soak. and the reason the other methods are dangerous, is they can, and sometimes will catch fire when spraying onto a hot engine.

 

[Fastfreddie]

vacume leaks

When I am trying to locate a vacume leak I use a 3' length of vacume hose and hold one end to my ear (hold it close without stickin it in my ear lol) and probe the other end in the area of the leak and track it down . If that fails, then follow the vacume lines with the hose one at a time being careful not to let the extra hose get caught up in the belts or pullies.

 

[4x4Newbie]

My buddie's MJ has TERRIBLE vaccum leak issues... Good info.