Best way to find vacuum leak?
 

Just like it says, what's the best way to find vacuum leaks? Propane? ether?:rolleyes: j/k.... anyone know what works best?

starting fluid can work also. listem for the motor changing idle speed. spray likely areas and listen for the motor slowing or speeding up. anything flammable will work, carb cleaner, brakeleen, ether, etc

Propane works well and its cheap/easy to get. (its what the shops use as well). Buy a torch and a length of hose to fit over the nozzle. Crack the valve partially open and start hunting. Try dumping it into the intake first so that you can get a sense for how much it takes to change the idle.

Henrik
87TII

I've also hear that a doctors stethoscope can help you "diagnose" a vacuum leak. If you can find one, other than that, a big enough vacuum leak should make a definate hissing sound when you get your ear down close to it; just make sure not to get your hands or hair or something cought in all the moving belts.

i have some pressure plugs i made... It lets you pressureize the engine to 5-10psi and it shows exactly where the leak is :)
My car holds vacuum for 15 minutes after its turned off! Its tight as hell :)

Do you have a picture of this setup you speak of? Sounds intesting,

mine is just a mothers metal polish( the small can) and i drilled a whole in it and tapped it... Then put a air compressor fitting on it and pressureize with less than 12 psi! Dont try be a hero.... 120psi will blow hoses off like crazy!.. dont ask how i know..