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Old 09-07-2012, 11:54 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 09-08-2012, 12:20 AM   #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, 07:19 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, 08:00 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, 02:26 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, 09:40 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, 09:52 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, 10:42 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 10:50 PM.
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Old 09-08-2012, 11:13 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 09-09-2012, 12:02 AM   #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, 01:38 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, 01:39 AM   #12
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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, 02:49 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, 06:59 PM   #14
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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, 09:35 PM   #15
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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, 02:43 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, 11:40 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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Old 06-05-2014, 12:17 PM   #18
Mayamar44
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Default Hose from throttle body to inner cooler

Just had hose from throttle body to inner cooler replaced. 9000 miles on 2012 WRX. It was loose, dealer replaced no dolla under warranty. Also, had driver side turn signal harness rerouted, blinking quickly and owners manual says it's a bulb. Not with 9000 miles on it. No dolla there either, warranty. Even replace rear wiper blade, dealer specific no Pep Boys, no dolla.
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Old 06-05-2014, 07:50 PM   #19
Eyedeas
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Quote:
Originally Posted by RoadKillDMD View Post
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).
I can confirm this.
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Old 06-06-2014, 03:38 PM   #20
xluben
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Quote:
Originally Posted by Mayamar44 View Post
Just had hose from throttle body to inner cooler replaced. 9000 miles on 2012 WRX. It was loose, dealer replaced no dolla under warranty. Also, had driver side turn signal harness rerouted, blinking quickly and owners manual says it's a bulb. Not with 9000 miles on it. No dolla there either, warranty. Even replace rear wiper blade, dealer specific no Pep Boys, no dolla.
If the dealer replaced the hose, that means they put those rubber caps back on the ends. That means that it will probably fail again later and could cause damage to the motor due to a lean condition. The correct resolution would be to remove the caps from the ends of the hose.
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Old 06-07-2014, 11:05 AM   #21
Omni003k
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As it has been said, you don't need a new hose, just take off the retarded rubber boots off of the stock hose and re-install it.
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Old 06-08-2014, 01:20 AM   #22
Eyedeas
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For the record, I needed a new hose because the stock one wasn't long enough to comfortably fit on my perrin top mount. So, just saying. Some may benefit from a cheap silicone hose.

I did run stock with no caps for awhile though.
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Old 06-29-2014, 02:12 AM   #23
yertle
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I was at the track today and the car ('13 WRX stg2) seemed low on power, and I could hear my turbo more than usual. I hadn't been at this track with this car though, so it was tough to tell. AP shows 13.8 max psi but I wasn't sure what my target was (I wasn't super smart today). In my last session the car hesitated and I finally had the sense to call it quits. I checked the hoses more thoroughly and finally found the clamp had slipped off this stupid gasket. Reassembled at the track (with gasket) and drove home.

Am I at risk of having damaged anything? I was at a track so I wasn't taking it easy. I'm hoping that everything was just running rich when it wasn't getting full boost?

I will remove the gaskets and crank down the clamps - thanks for the info.
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Old 06-29-2014, 08:49 AM   #24
Jubathoph
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When you have a leak in the intake tract post compressor, you will run lean while the manifold pressure is in vacuum because unmetered air is getting sucked in through the leak. When you get into boost it will run rich, because metered air is now getting pushed out of the leak.

I struggled with hoses popping off and leaky tb to IC hose when upping the boost to 20psi. You should look at boost pressure and AF learning to troubleshoot small leaks.

Normally my vaccum pressure was -10.3 to -10.5 warmed up vacuum pressure, but with a small leak my vacuum pressure was in the -9 psi range.
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Old 06-29-2014, 10:44 AM   #25
mejifair
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Quote:
Originally Posted by BigRob74 View Post
this is the "gasket" that needs to go

What was this picture? I am curious to take a look at mine. I took the IC to TB hose off last weekend and it had a little bit of oil in it.

I get a high pitched "psssssst" at WOT ever since installing my TXS catback and I have been looking at different areas to pinpoint the sound.

Thanks.
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