vacuum leaks - Saab Forums

Mr_boondoggle · #1 01-20-2009, 05:36 PM

What do you know about finding vacuum leaks?

What is the best to locate a vacuum leak?

How does a professional shop find a vacuum leak?

Roto · #2 01-20-2009, 05:59 PM

The most commonly used way of finding a leak is spraying carb cleaner on the vacuum hoses and listening to the engine change RPM when you hit a leak. I don't do that however, I simply replace all the hoses periodically. There's only what? 6 vac lines on the car? About 10' of silicone hose fixes it. If it's not a hose than carb cleaner works I guess. My mech simply finds them by ear.

boostpowered · #3 01-23-2009, 07:26 AM

dish soap in a spray bottle the leaks will bubble

959kaero · #4 01-31-2009, 12:29 PM

i found a crack in my vacuum line that on the fenderwall near the battery its the one that comes off the lil 3 ended thingy pointing towards the firewall but it goes under the battery and is shrinkwrapped so i dont know where the other end of this line goes too to swapp it out my saab is a 1995 9ooo aero anyone know?

Saab Fahrer · #5 01-31-2009, 07:42 PM

Carb cleaner is the quickest, but if I can't find it with that and I'm sure there is one, then I break out the smoke machine. Its mostly used for EVAP emissions leaks, but works great for vacuum leaks too.

boostpowered · #6 02-01-2009, 10:18 AM

if i am correct that line that goes through your false bulkhead runs to the boost gauge and the over boost protection switch

959kaero · #7 02-01-2009, 01:38 PM

thank you boostpowered is there any chance you can tell me where that is cause what i guessed it was was the hose that went to or came from the big plastic thing that points at the radiator very close to the fan and thats what i connected it too but i dont want to break something and yes the car scoots a bit more it doesnt woosh like it did before
can you where this unit is or what to look for so i can hook it up correctly plz?

boostpowered · #8 02-02-2009, 07:32 AM

post some pics it will help diagnose the problem better . are you talking about the apc with three silicon lines sitting on the drivers side above the radiator fan that has a electrical connection that is essentially your boost controller

959kaero · #9 02-02-2009, 04:58 PM

after my hangover wore off i reread your post and i understood it alot better got inside the false bulkhead and re ran the hoses to their proper spots everything is working properly now^^ty for the help