Vacuum leak? Getting it confirmed and fixed.
Thread Starter
Registered User
iTrader: (23)
Joined: Jan 2007
Posts: 751
From: South Bay
Car Info: 2011 STI Sedan
Vacuum leak? Getting it confirmed and fixed.
I'm looking for advice on getting a potential vacuum leak run down and fixed. 2005 WRX, stock intake. Car runs and drives fine.
Over the last year I've had a CEL come on a few times: P0171 - SYSTEM TOO LEAN. Seems that can be caused by a number of different things, and I've been through many of them -- airbox closure, MAF cleaning, hose connections check...)
Last week it lit up again and I replaced the front O2 sensor. That wasn't it. Turns out I'd been overlooking AFR measurement. So I hooked up the laptop, reset the ECU and let the car come to temp from cold, at idle with a couple of prods of the throttle. I get the screenshot below out of Learning View.
From what I read this looks like a vacuum leak. Back under the hood I think I can hear some hissing from around the turbo inlet, but can't find an actual leak.
Has anyone else had this experience and gotten it fixed and, if so, which shop(*)? I'm thinking this could turn into many hours of shop labor leak-hunting, so I'm hoping for somewhere that's got direct experiences of fixing these on turbo Subarus, and can fix whatever they find.
(*) Default is taking it to LIC, but that's trickier to schedule around work.
Over the last year I've had a CEL come on a few times: P0171 - SYSTEM TOO LEAN. Seems that can be caused by a number of different things, and I've been through many of them -- airbox closure, MAF cleaning, hose connections check...)
Last week it lit up again and I replaced the front O2 sensor. That wasn't it. Turns out I'd been overlooking AFR measurement. So I hooked up the laptop, reset the ECU and let the car come to temp from cold, at idle with a couple of prods of the throttle. I get the screenshot below out of Learning View.
From what I read this looks like a vacuum leak. Back under the hood I think I can hear some hissing from around the turbo inlet, but can't find an actual leak.
Has anyone else had this experience and gotten it fixed and, if so, which shop(*)? I'm thinking this could turn into many hours of shop labor leak-hunting, so I'm hoping for somewhere that's got direct experiences of fixing these on turbo Subarus, and can fix whatever they find.
(*) Default is taking it to LIC, but that's trickier to schedule around work.
Thread Starter
Registered User
iTrader: (23)
Joined: Jan 2007
Posts: 751
From: South Bay
Car Info: 2011 STI Sedan
Registered User
iTrader: (23)
Joined: Feb 2009
Posts: 2,674
From: South SF
Car Info: 97' Dodge Cummins and an RSTI thingie
Greg, I had the same problem but my problem was fixed wih a new afr (front o2) sensor. Did you replace it with a denso? I have a vaccum gauge and you can come over and do it the old fashioned way and rule out the problem hose by hose.
iClub Silver Vendor
iTrader: (12)
Joined: Mar 2003
Posts: 8,228
From: 631 Railroad Ave. Fairfield, CA
Car Info: A Laptop
Thread Starter
Registered User
iTrader: (23)
Joined: Jan 2007
Posts: 751
From: South Bay
Car Info: 2011 STI Sedan
I used a Bosch sensor. I'm leaning toward the shop route because I don't think I have the patience if the fix turns out to be a replacement turbo inlet. Thanks, though -- If I wake up keen I might give you a shout.
Registered User
Joined: Nov 2010
Posts: 587
From: $acto
Car Info: 90 325is
iClub Silver Vendor
iTrader: (12)
Joined: Mar 2003
Posts: 8,228
From: 631 Railroad Ave. Fairfield, CA
Car Info: A Laptop
I'm glad we were able to take care of it for you Craig. Enjoy the car and please don't hesitate to contact us if you have any further questions.
Thanks
-- Ed
Thanks
-- Ed
Thread
Thread Starter
Forum
Replies
Last Post
silver_wrx
Suby Shopping & Maintenance/Warranty
2
Aug 1, 2006 03:20 PM
circaisdashiat
Engine/Power - non turbo (All non turbo Imprezas)
7
Sep 29, 2005 04:31 PM
