Boost leak locations..?

NsinEvo8 · Jun 20, 2009, 02:45 PM

Im doing boost leak test thru turbo inlet, and found a couple obvious leaks. one at ic pipe and other at breather tubing.. I compress air to about 15psi and i hear this faint noise aroun manifold. The others where hissing, but this one is quiet and i cant find it!

pressure drops about 1psi every 4-5sec. Sounds like its under many, ive check tps, and other vaccum tubes. Any other method i can use, or other locations i havent checked?

Thanks guys

LOVEBOOOST · Jun 20, 2009, 02:49 PM

It could be your seals in your throttle body

DBallz · Jun 20, 2009, 03:04 PM

Quote:

Originally Posted by LOVEBOOOST

It could be your seals in your throttle body

NsinEvo8 · Jun 20, 2009, 03:04 PM

^ i looked around there but, i have a new boomba tb. had adjustable cam gears installed recently, possibly the valve cover gasket? how about dip stick? lol man so many places.. back to square 1.. ikd, ill check it again later

LOVEBOOOST · Jun 20, 2009, 03:09 PM

AHH.. if you have a new throttle body it probably aint coming from there and u said its coming from around the intake manifold

kanyonkid · Jun 20, 2009, 03:19 PM

its gotta be coming from one of the 150 vaccum lines in the manifold... goodluck as i have the same issue.. how faint is the "hissing" sound? mine is extremely faint and i dont have a boost tapering problem when WOT

1NastyMR · Jun 20, 2009, 03:22 PM

Check all your EGR vacuum hoses behind your intake manifold

fugiwara · Jun 20, 2009, 03:27 PM

Quote:

Originally Posted by LOVEBOOOST

AHH.. if you have a new throttle body it probably aint coming from there and u said its coming from around the intake manifold

If the new throttle body still uses factory throttle body seal then it's gonna leak no matter what. factory seal just ain't seal well. That's why the aftermarket seal are harder to put in b/c they are tighter. if you have replaced your throttle shaft seal you'll know.

NsinEvo8 · Jun 20, 2009, 04:57 PM

^ Its a whole new throttle body. No leaks in that area, ive squirted green soap all around exposed areas, injector seals, tb/manny gaskets, some vaccum lines & boost gauge tube, which is where there is another tiny leak, but i capped that off so..

Quote:

Originally Posted by kanyonkid

its gotta be coming from one of the 150 vaccum lines in the manifold... goodluck as i have the same issue.. how faint is the "hissing" sound? mine is extremely faint and i dont have a boost tapering problem when WOT

^lol. it probably is. Its really not a hiss, more like verrry light vent noise?, and pressure drops real slow? I can barly hear it,, if it wasnt for guage dropping psi, i wouldnt even know about it...
So you dont have any taper huh? even though you got that small leak?

dxbevo9 · Jun 20, 2009, 11:42 PM

believe it or not i found a boost leak in the seal of one of the injectors on the intake manifold once..
hope that helps

NsinEvo8 · Jun 21, 2009, 02:34 PM

So, i did some more boostleaktesting, and found its an internal leak

I opened valvecover oil cap, an could hear the leak.. gurgling also. I even turn the crank to make sure its atdc.. Damm, What could be causing the leak..? what do i have to do now??

bbyevo8u · Jun 21, 2009, 03:05 PM

internal leak??

NsinEvo8 · Jun 22, 2009, 10:36 PM

does this happen to anyone else? ive searched around and seems to be normal, air will leak out engine, either out exhaust, or crankcase. not %100 airtight. can someone confirm this?

huevosrancheros · Jun 23, 2009, 01:18 AM

that is some weird shiet.

20gmr · Jun 23, 2009, 07:10 AM

Its natural that air is going get passed the piston rings. If you are really concerned do a compression test followed by a wet Compression test.