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04-06-2013, 04:27 AM | #1 |
Scooby Specialist
Member#: 310506
Join Date: Feb 2012
Chapter/Region:
South East
Location: Florida
Vehicle:2005 WRX STi CGM |
Very rich - Learning View Attached
Hey guys,
05 STI - Protuned w/ APS Inlet, APS Intake, TGV -'s, TBE, Perrin Up pipe, Turbo XS TMIC. I recently got a wideband to troubleshoot the lack of power that i'm having. Essentially due to fueling inconsistencies / knock. The AFR at WOT in any gear will go down to 9.8 if i let it. Needless to say, i'm staying off of it, but here is my learning view, after a week of not resetting the ECU. At the same time, I popped open RomRaider and noticed that even at idle, I had an AF Correction #1 ranging through -3.12 - 14.84. I had done a boost leak test before and didn't find anything. Any ideas as to what could be causing this guys? I've done the starter fluid test, and couldn't notice any leaks either! I did a compression test last week, and everything was healthy. Disregard the memorized codes - those were from a week ago. When i tried unplugging the maf / o2 sensor. Thanks!!
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04-06-2013, 05:26 AM | #2 |
Scooby Newbie
Member#: 127614
Join Date: Sep 2006
Chapter/Region:
MWSOC
Location: Neenah, WI
Vehicle:2008 WRX Obsidian Black |
Last edited by aberg12012; 04-06-2013 at 05:35 AM. |
04-06-2013, 07:32 AM | #3 | |
Scooby Specialist
Member#: 274499
Join Date: Feb 2011
Chapter/Region:
NESIC
Location: RI
Vehicle:1994 5.8T Cobra 755rwhp @ 16psi |
Quote:
Basically, your car has a mechanical fault and needs to be fixed. |
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04-06-2013, 01:17 PM | #4 |
Scooby Specialist
Member#: 310506
Join Date: Feb 2012
Chapter/Region:
South East
Location: Florida
Vehicle:2005 WRX STi CGM |
Prior to resetting the ECU, the car runs and has the same exact issues, less the codes. I've taken multiple learning view screenshots, and they're all nearly identical (maybe .1 off lol).
What could cause these conditions? My tuner can't do anything because he lives out in another state, and can't seem to track it down through the internet. He charges for e-mails so I can't just keep throwing money at him for it. There aren't any reputable shops in this area, either, aside from the dealership. I need your guys' help! |
04-06-2013, 02:36 PM | #5 | |
Scooby Specialist
Member#: 323379
Join Date: Jun 2012
Vehicle:1992 Trans Am |
Quote:
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04-06-2013, 04:13 PM | #6 |
Scooby Specialist
Member#: 310506
Join Date: Feb 2012
Chapter/Region:
South East
Location: Florida
Vehicle:2005 WRX STi CGM |
Haha - well he didn't charge for the first couple, but once I sent him logs and whatnot...
It's Scott Siegel. |
04-06-2013, 09:22 PM | #7 |
Scooby Specialist
Member#: 274499
Join Date: Feb 2011
Chapter/Region:
NESIC
Location: RI
Vehicle:1994 5.8T Cobra 755rwhp @ 16psi |
Pm me for my email. I'll have a look at the tune for you.
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04-06-2013, 11:33 PM | #8 |
Scooby Guru
Member#: 4414
Join Date: Feb 2001
Location: Dublin, CA
Vehicle:2002 WRX Sedan Midnight Black |
The LV at idle indicates a leak, but trims aren't terrible anywhere else. Boost dropping below 10 indicates what is most likely a mechanical issue. It's possible Scott messed up the ROM in some way, but not likely.
It does very much have the symptoms of a post-turbo leak... it's small under vac, which only really affects idle trims dramatically. Under boost it's larger, affecting AFR. He probably started charging because he realized you want help troubleshooting what he has determined is a mechanical issue. Was your boost leak test after you had these symptoms? What psi did you pressurize to? and what did you use to attempt to detect the leak? |
04-06-2013, 11:54 PM | #9 | |
Scooby Specialist
Member#: 310506
Join Date: Feb 2012
Chapter/Region:
South East
Location: Florida
Vehicle:2005 WRX STi CGM |
Quote:
The pressure test was also after the symptoms occurred, and I used soapy water for that test. |
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04-07-2013, 01:09 AM | #10 |
Scooby Guru
Member#: 4414
Join Date: Feb 2001
Location: Dublin, CA
Vehicle:2002 WRX Sedan Midnight Black |
Yes, it could be TGV or intake manifold.
Lean at idle and rich on boost indicates a leak between the turbo and the engine. At idle it sucks in extra air and leans out the mix. On boost air gets pushed out and things get rich. All connections between turbo to engine. Could be as simple as a boost hose, or as painful as the TGV to heads gasket. |
04-07-2013, 09:48 AM | #11 |
Scooby Specialist
Member#: 310506
Join Date: Feb 2012
Chapter/Region:
South East
Location: Florida
Vehicle:2005 WRX STi CGM |
It's so weird. ItS not always when in on boost either. I was idling after getting gas yesterday, and it was idling at 9.8 - I don't know why it would be running so rich.
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04-07-2013, 09:06 PM | #12 |
Scooby Specialist
Member#: 310506
Join Date: Feb 2012
Chapter/Region:
South East
Location: Florida
Vehicle:2005 WRX STi CGM |
Ok I cleaned the maf, put a new pcv valve in, and put a new clamp on the y pipe to turbo. Idle seems a bit better, but it still hits like 10.4 at wot. Also, it feels like there isn't any additional power between 70% throttle and 100%.
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04-07-2013, 11:34 PM | #13 |
Scooby Specialist
Member#: 310506
Join Date: Feb 2012
Chapter/Region:
South East
Location: Florida
Vehicle:2005 WRX STi CGM |
Any other ideas guys? Are there other possible causes for this besides a boost leak?
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04-08-2013, 12:36 PM | #14 |
Scooby Specialist
Member#: 310506
Join Date: Feb 2012
Chapter/Region:
South East
Location: Florida
Vehicle:2005 WRX STi CGM |
Bumppp
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04-08-2013, 04:46 PM | #15 |
Scooby Specialist
Member#: 160040
Join Date: Sep 2007
Chapter/Region:
AKIC
Location: Anchortown
Vehicle:2002 Bugi / 1993 L Symmetry Tuning |
a bad front O2 sensor......
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04-08-2013, 06:07 PM | #16 |
Scooby Specialist
Member#: 310506
Join Date: Feb 2012
Chapter/Region:
South East
Location: Florida
Vehicle:2005 WRX STi CGM |
True - I unplugged the front o2, and the car ran at 10 AFR at idle as well, oddly enough.
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04-10-2013, 08:06 PM | #17 |
Scooby Specialist
Member#: 310506
Join Date: Feb 2012
Chapter/Region:
South East
Location: Florida
Vehicle:2005 WRX STi CGM |
Ok guys - I installed a new o2 sensor and it's still having the issue. The car idles almost perfectly when I unplug the maf sensor. So that means either I have a vac leak somewhere, or my maf sensor is bad?
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