boost leak test help

**b5s46speed** · 05-01-2008 08:37 PM

i just bought a awe built leak tester is it suppose to hold pressure or just leak out did it and i hear a a leak from back of the motor some where anyone have any idea why

**RuS4ty** · 05-01-2008 10:56 PM

annnnd..... period.

no it's not supposed to leak

**The_Jerbel** · 05-01-2008 10:57 PM

Spray some soapy water in the area you hear the hissing coming from. That should reveal where the leak is.

**Jsmooth65** · 05-02-2008 10:10 AM

Its not like filling up a balloon. You are pushing pressurized air through the system. It will make noise, but you shouldn't feel any air coming out anywhere if you stick your hand behind the intake.

**exorcet** · 05-02-2008 10:14 AM

fill a spray bottle with soapy water and spray the area you hear the noise coming from. You will see bubbles start to form where the leak is. My guess is the brake booster line t-fitting.

**b5s46speed** · 05-02-2008 09:13 PM

do u have to put constant air through it or is it suppose to hold the air

**b5s46speed** · 05-02-2008 09:15 PM

because we put a valve stem to the tester and soon as i fill it it will be empty within 15 seconds and the boost gauge wont go past 10 pounds on the gauge while filling it

**Jsmooth65** · 05-05-2008 09:10 AM

Originally Posted by b5s46speed

do u have to put constant air through it or is it suppose to hold the air

You have to hook it up to a constant 15-20 psi supply (air tank/compressor with a regulator set to 15-20 psi). So yes, there will be constant pressure flowing through the system as long as the compressor has enough pressure in the reservoir.

Its not a balloon. You are pushing air through the system, not filling it with air and looking for leaks. You need to put 15-20 psi into it, because that will make the leak obvious and will replicate actual possible operating pressures.

**BillKlineVT** · 05-05-2008 05:52 PM

make sure you block off the breather/pcv port on the y pipe

**Allaidback** · 09-17-2008 07:01 AM

I preformed this test last night and all I could hear is the air pressure going into the y-pipe or leaking behind it, very loudly! Checked all hoses and couldn't find anything...also did the soapy water. What could be leaking so bad underneath the y-pipe? Also, if I have a mbc hooked up, should I do the leak test with just the n-75 valve in place instead?

**casawhites4** · 09-17-2008 09:02 AM

lol, i need to pressure test my car, just havent made it to home depot and got a fitting to connect it with my air compressor...but damn do i have a leak, it bounces up and down when hitting boost...not sure what it is...but will findout soon enough bosses...any idea what kind of fittin fits on the intake tester, im in dc and dont have the part with me so i can take it in and see what connection..so if anyone knows, please let me know so i can go and get it without having to go home and get it.