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Old 09-07-2012, 10:54 PM   #1
simplystockwrx
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Default 2011-2012 Intercooler to Throttle body hose question

Yesterday I was cleaning my motor this dude stops by and asked if I had a problem with my '12 WRX? After I told him I had no issues then he went on to say that he owned an '11 WRX with around 12,000 miles that was currently at the dealer getting repaired. He was running a Stage 2 set up of some sort and under boost his "intercooler to throttle body hose" was saturated with oil due to blow by and slipped off enough to cause a decently audible whine and vacuum leak. Dude also said Subaru is aware of this issue and is trying to figure out a work-around but would not warranty. I'm guessing the warranty refusal is from the Stage 2 setup. This is all hear say from someone I don't even know and I'm curious if this has happened to anybody else with a 2009+ WRX? Is this possible? Would an AOS fix this issue if there is such an issue? My car is completely stock and I'm driving back to Cali from WV in a few days and I was thinking about removing my intercooler just to check **** out. Before I do that I thought I'd ask around 1st.
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Old 09-07-2012, 11:20 PM   #2
RoadKillDMD
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An AOS would definitely help. IIRC, there have been reports of oil still getting into the intercooler and throttle body on stage 2+ WRX/STI's (at least with the Grimmspeed AOS).
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Old 09-08-2012, 06:19 AM   #3
BigRob74
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stage 2 cars are known to blow the ic to tb hose. remove the bs "gasket" thats in there and retighten, problem solved. if you are stock you are fine. happens at 19 psi
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Old 09-08-2012, 07:00 AM   #4
DurtyB
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Yes this is common. More so on modified cars but can still happen stock. I think the best alternative is either the gimmick or AVO throttle body hoses. They are longer than stock and shouldn't slip off. Also, you can get some Tbolt clamps and tighten those suckers down.
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Old 09-08-2012, 01:26 PM   #5
Shtbxr255
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I work at a subaru dealer, and we have replaced a bunch of these. it seems the oil ruins the bond between the sleeves on the ends and the coupler. All replaced under warranty. It seems more prevalent in 2010+ though. I recently replaced on on a car with maybe 500 miles. I'd just replace it with a suitable one piece hose from an aftermarket company if it was my car.
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Old 09-08-2012, 08:40 PM   #6
guygettnby
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I just removed the sleeves on each end of the hose and buttoned it all back up using t-bolt clamps. Problem solved....

Also you can spray abit of hair spray on the inside of the house to help keep it on from what I have read. I didn't bother though since I replaced the clamps.
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Old 09-08-2012, 08:52 PM   #7
424wrx
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had the oil issue. installed a grimmspeed aos. no more oil in the tb hose now.i also removed the endcaps on the tb hose. no issues at 22 psi for about 2 years.
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Old 09-08-2012, 09:42 PM   #8
Darkhorse85
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I bet this is the root cause of a lot of the 2011+ WRX all cylinder misfire issues on stock cars with ~10,000K miles.


Anyone have a microfiche diagram or photo identifying the exact throttlebody hose at fault or what the fault looks like?

Last edited by Darkhorse85; 09-08-2012 at 09:50 PM.
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Old 09-08-2012, 10:13 PM   #9
BigRob74
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this is the "gasket" that needs to go



Quote:
Originally Posted by Darkhorse85 View Post
I bet this is the root cause of a lot of the 2011+ WRX all cylinder misfire issues on stock cars with ~10,000K miles.


Anyone have a microfiche diagram or photo identifying the exact throttlebody hose at fault or what the fault looks like?
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Old 09-08-2012, 11:02 PM   #10
xluben
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Take the "gaskets" or "caps" (shown in the post above) off of BOTH sides of that hose. Then bolt it back on and never worry about it again. I run 27-28psi with the stock hose and it works just fine. No need to spend money on a new one.
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Old 09-09-2012, 12:38 AM   #11
PleiadesSTi
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Moroso AOS is the best out there and is a very nice unit. Actually catches the crap. I have it on my 09 wrx and loooooove it. Get a new aftermarket throttle body hose and two t-bolt clamps and problem solved.
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Old 09-09-2012, 12:39 AM   #12
PleiadesSTi
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Quote:
Originally Posted by xluben View Post
Take the "gaskets" or "caps" (shown in the post above) off of BOTH sides of that hose. Then bolt it back on and never worry about it again. I run 27-28psi with the stock hose and it works just fine. No need to spend money on a new one.
27-28 psi. Dear Lord son. You got a built motor???
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Old 09-09-2012, 01:49 AM   #13
RoadKillDMD
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Quote:
Originally Posted by PleiadesSTi

27-28 psi. Dear Lord son. You got a built motor???
Oh my..

http://forums.nasioc.com/forums/show....php?t=2078765
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Old 04-21-2013, 05:59 PM   #14
crschneiderwrx
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i have a 2011 wrx and the tb to ic hose has popped off multiple times. I installed a grimmspeed aos and it happened again at the track was running 13.3, then a 13.7 then a 14.3!!!! i was like!!! BOOOOOST LEAK!!! didn't think to just get rid of the darn gasket things that make installation a hassle to begin with. I was just going to upgrade to a fms tmic (processwest replica) and replace the darn hose!
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Old 04-21-2013, 08:35 PM   #15
xluben
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Just take the caps off like I suggested. I'm currently on a new setup and I'm still running the stock hose. At around 30psi right now, but I've done pulls up to around 32psi without any issues.
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Old 04-22-2013, 01:43 AM   #16
bacalhau16
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crschneiderwrx, I hope you already have all the stage 2 supporting mods and such for that upgrade. Spending that much money on a new TMIC when all you have to do is remove the endcaps/gaskets on the stock tube, just seems wasteful.
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Old 04-24-2013, 10:40 AM   #17
nickysigz06sti
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My 06 still did this two days ago... found myself in auto one parking lot using a spectre hose from auto one to hold up for now.. it seems to be holding good considering I drive my car pretty hard.. im a little more then what most would consider stage two . Anyone heard of this happening to 2006 stis?
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