|
|
|
|
Thread Tools | Display Modes |
11-07-2020, 06:43 PM | #1 |
Scooby Newbie
Member#: 349565
Join Date: Mar 2013
|
Power Loss / Boost Leak? / Up Pipe? / Loud Squealing
Hey guys. I have a 2014 Sti that is basically stock.
I’m having a loud squealing and hissing noise whenever my car goes to boost (3k rpms). Sounds like a loud pig! Noise sounds like is coming from passenger side. I checked for boost and vacuum leaks and replaced the following: Intercooler couplers Turbo inlet hose All clamps Car acts normal when idling; only weird under boost. Any idea what’s going on? Could an up pipe be causing problems? Problems started after I test fitted a cold air intake, took it for a drive, and put the stock back on (I know, it needed a tune).
* Registered users of the site do not see these ads.
|
11-07-2020, 11:02 PM | #2 |
Scooby Newbie
Member#: 378873
Join Date: Jan 2014
Chapter/Region:
MWSOC
Location: Omaha, Ne
Vehicle:2012 WRX Sedan Ice Silver Metallic |
Did you check the intercooler to throttle body coupler? Its know to slide off or crack.
Check the turbo inlet where it meets the turbo. It can also crack or fall off. |
11-07-2020, 11:17 PM | #3 |
Scooby Newbie
Member#: 349565
Join Date: Mar 2013
|
Yes I changed them both
|
11-08-2020, 10:22 AM | #4 |
Scooby Newbie
Member#: 400179
Join Date: Aug 2014
Vehicle:2009 wrx |
sounds like a boost leak test might be in order. it only takes 2 or 3 psi usually to find leaks. checking by eye is a good first thing to try, but there are so many places that boost leaks can hide - but they usually can't hide from a boost leak test. while testing listen for the same noise, sometimes you can feel air blowing out from a leak, or sometimes spraying soapy water on everything will cause bubbles at the leak.
|
11-08-2020, 11:41 AM | #5 |
Scooby Newbie
Member#: 349565
Join Date: Mar 2013
|
Do I need to block off the vacuum lines and open the engine oil cap before I do a smoke test? I’m getting different answers from different people
|
11-08-2020, 11:48 AM | #6 |
Scooby Newbie
Member#: 400179
Join Date: Aug 2014
Vehicle:2009 wrx |
yeah, lots of different ways to do it. personally i just go for the very low (2 or 3 psi) test, remove oil cap, then remove the large hose from the air cleaner housing and use something cobbled together to get air into that. then listen and feel for leaks, and spray soapy water if necessary on everything that could be a leak.
with that low pressure test, i don't find it necessary to block off any vac lines etc. |
11-13-2020, 02:18 AM | #7 | |
Scooby Newbie
Member#: 519457
Join Date: Oct 2020
Chapter/Region:
BAIC
Location: Santa Cruz, CA
|
Quote:
also when doing a smoke tes, do you need to block off vacuum lines?? i need to know as well lol |
|
11-19-2020, 11:23 PM | #8 |
Scooby Guru
Member#: 487
Join Date: Nov 1999
Chapter/Region:
TXIC
Location: Houston TX
Vehicle:1998 /2005 STunIcorn Acadia Green USDM 22b |
Lots of people would say this harms rubber hoses etc
But I would spray either carb/brake cleaner around engine bay With car idling.......if you have dip/rise in RPM.....there is your leak man (If u use non-chlorinated BC, RPM will dip down) |
Thread Tools | |
Display Modes | |
|
|