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05-15-2018, 12:08 AM | #626 | |
Scooby Specialist
Member#: 29292
Join Date: Nov 2002
Chapter/Region:
SCIC
Location: Orange County CA
Vehicle:2004 WRX wagon silver |
Quote:
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05-31-2018, 04:07 PM | #627 |
Scooby Newbie
Member#: 486639
Join Date: May 2018
Chapter/Region:
MAIC
Location: Pittsburgh, PA
Vehicle:2005 wrx, 9-2x silver :( |
to add my fix to this.
05 wrx, started throwing code and running like garbage. before i got the code i would get mild surging/hesitation at wot. after the code and running like garbage i started getting misfire codes along with the 171. fpr/fuel pump and filter solved all of it. took that opportunity to switch the fuel filter to the engine bay like the 02-04 wrx |
08-17-2018, 12:59 PM | #628 |
Scooby Newbie
Member#: 490289
Join Date: Aug 2018
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Damn MAF..
*REPOST FROM CEL STICKY*
Threw a CEL today, came back as PO171 said I would need a new MAF, already had injector seals replaced, but smell gas on start or on a harder pull 2008 WRX mods: COBB stage 1 CAI Invidia Downpipe note:just purchased vehicle about a week ago, am going to try cleaning out MAF but ive read that aftermarket intakes can throw a CEL for your MAF commonly. HELP |
11-09-2018, 12:00 PM | #629 |
Scooby Newbie
Member#: 493796
Join Date: Nov 2018
Location: Oakland, CA
Vehicle:2004 WRX, no mods Silver |
Not helpful to the previous poster, but mine was fixed by re-attaching the hose to the T-fitting on the BOV... I guess it popped off when I took my intercooler out. I also tightened the intercooler/turbo connection hose, which may have helped.
CEL disappeared after a hundred miles or so of mixed city/highway driving. 04 WRX, no mods |
11-13-2018, 05:12 PM | #630 |
Scooby Newbie
Member#: 430276
Join Date: Sep 2015
Chapter/Region:
South East
Location: Melbourne, FL
Vehicle:2007 Stage 2 STI Obsidian Black Pearl |
I guess I'll add to the list to see if anyone else can help.
I am having a P0171 code on my 07 STI as well... This code popped up after the following 3 things happened:
Last edited by Gumdrop; 11-17-2018 at 08:08 AM. |
11-15-2018, 07:45 PM | #631 |
Scooby Newbie
Member#: 318074
Join Date: Apr 2012
Location: WA
Vehicle:2006 Black |
Going through the same issue right now.
Stock 2003 WRX, 2.0T Behavior: Car starts perfectly fine, like not even a crank of the engine before it's started; doesn't seem to have any issue idling either. Car seems to drive OK at low RPM but as soon as it gets into boost it just falls on it's face. Medium to heavy throttle will do nearly nothing and feels like the car is choking, not sure if it's a "no air" or "no fuel" choke. Light throttle (25% or less) will accelerate to highway speeds fine and drive like normal. Haven't done a boost leak test but verified by hand that all lines are present and no obvious disconnects. Fuel filter has been replaced, shop reported that fuel pressure is 35psi and spec is 43.5 (research says this is normal, shop says it's low?) Don't want to start spending money on parts and throwing them at the car (MAF, O2 sensor, fuel pump), but would also like to get this resolved ASAP |
11-18-2018, 12:53 AM | #632 |
Scooby Newbie
Member#: 485695
Join Date: May 2018
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After going through the list having no sucess and completly giving up, I decided the best route would be to upgrade my way out. I went e85 so I had to replace my pump, injectors, filter, and cleaned out the hard fuel lines with an air hose, a bunch of crud came out, I'm pretty sure the clogged lines were the cause of my cel
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11-19-2018, 02:17 AM | #633 |
Scooby Newbie
Member#: 487720
Join Date: Jun 2018
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P0171 code as well as (bucking / backfire) after WOT
i know this is an old thread and im new to nasioc so i dont really know how to start my own, i just figured id ask since you all have had an idea of this problem before.
i have a 2006 subaru sti with a 20g turbo, ewg, rebuilt motor, lightweight crank pulley, lightweight flywheel, perrin turbo inlet, full invidia exhaust, grimmspeed uppipe an stock headers.TGV delete, hks bov. When i originally rebuilt the motor over a 6 months ago i got a new denzo o2 sensor in the front and tonight i replaced my downpipe one. i also got a new 265 walbrow fuel pump when i rebuilt it. it always drove fine after i rebuilt but always almost died when coming to a stop, it didnt have any codes before an then i blew my turbo and replaced it with a 20g. every part i have installed has been tuned by my etuner. my afrs read from 17-20 afr. i have replaced intake manifold gaskets last week as well as tgv gaskets. as well as cleaned and oil my typhoon k and n intake filter. also cleaned MAF with rubbing alcohol. used a wire wheel to clean front o2 and replaced downpipe o2 today and im kind of stuck at this point, i have replaced seals to my maf and changed hose after hose just to see if it would do a difference but stil nothing. its to the point where the car is undrivable and will buck and backfire really bad after it is fully warmed up. im really confused with what is happening. my maf shouldnt be bad considering my car shuts off completely after i unplug it while idling. i was hoping someone could pleaaassee help me. i got new ngk sparkplugs when i first rebuilt it 6 months ago as well, also took coil packs to oreillys to test them an nothing really changed with the numbers on a multimeter. they all said 0. please help me |
11-19-2018, 11:16 AM | #634 |
Scooby Newbie
Member#: 318074
Join Date: Apr 2012
Location: WA
Vehicle:2006 Black |
get rid of the BOV if it's vent to atmosphere. get a recirculating DV. that will help some of the issues with stalling coming to a stop.
also, if your afr are 17-20 you're going to blow something up if you haven't already. that's super lean. WOT should be 11-12 and idle should be about 14-15 get a boost leak test done |
11-20-2018, 02:05 AM | #635 |
Scooby Newbie
Member#: 487720
Join Date: Jun 2018
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So should I get a Perrin one? Also I blew my old turbo up so that’s why I got the new one lol, how do you think I can do a boost leak test? I’ve done a diy vac test but haven’t found any leaks
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12-03-2018, 03:45 PM | #636 | |
Scooby Newbie
Member#: 430276
Join Date: Sep 2015
Chapter/Region:
South East
Location: Melbourne, FL
Vehicle:2007 Stage 2 STI Obsidian Black Pearl |
Quote:
I originally started with the carb cleaner vac leak check, but didn't spray that gasket because I was afraid with injector/spark right there All fixed and running smooth! And hey...all sensors are now replaced..... |
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01-08-2019, 11:53 AM | #637 |
Scooby Newbie
Member#: 493487
Join Date: Nov 2018
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Hey guys. This thread is great so thanks for starting it! I may have missed it but I didnt really see anyone with the same as me. After my car warms up from driving and I come to a stop and idle for a while the light would come on. I can clear it and it seems to drive fine. However it does seem to be idling low. It's set at 800 but idles around 700.
2005 wrx. 190k miles Mods- perrin intake Forge Bov Full invidia catless dp and exhaust Cobb stage 2 Probably more from previous owners. Planning on getting rid of the bov to go back to a bpv but any other suggestions would be great. Last edited by ARhodes; 01-08-2019 at 12:49 PM. |
05-20-2020, 01:47 AM | #638 |
Scooby Specialist
Member#: 191557
Join Date: Oct 2008
Chapter/Region:
TXIC
Location: Rockwall-East DFW
Vehicle:2004 WRX Wagon WRB not so minty fresh |
Bringing it back for the Old Schoolers.....
Had this happen AGAIN.. culprit? one random vacuum cap blown free from boost.. venting to the air/sucking... adjustments swings from 25% for .007 opened the hood to do oil change @ hotel, bare vacuum nipple on intake waving at me. 3.5 days, no codes. Where as before, code 2-3 times a day ~Rob |
05-20-2020, 02:12 PM | #639 |
*** Banned ***
Member#: 512704
Join Date: Mar 2020
Location: Canada
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Anyone else ever see anything like this?
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08-05-2020, 10:46 AM | #640 |
Scooby Newbie
Member#: 517318
Join Date: Aug 2020
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Was the blue tee under the intercooler for me. I was having an idle and stalling issue and found this thread. Pulled the IC off and there it was disconnected on both ends, finally a cheap and easy fix. Thanks to everyone who contributed to this thread.
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09-08-2020, 06:22 PM | #641 |
Scooby Newbie
Member#: 456224
Join Date: Oct 2016
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Extreme fuel trims
Has anyone seen this code with extreme fuel trims? That’s what my AP is showing me.
It started yesterday, I found a disconnected vacuum line, reattached it and all good, got the cel again this morning headed to work, I don’t see anything disconnected. |
10-08-2020, 11:43 PM | #642 | |
Scooby Newbie
Member#: 260588
Join Date: Oct 2010
Chapter/Region:
MWSOC
Location: SE Michigan
Vehicle:2019 WRX Sti Black |
Quote:
At idle my AF is anywhere from 16-18. I’ve changed my ID 1,300’s to the cushion style o-rings which seemed to help a little but it’s still throwing the code and running like ****. |
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02-15-2021, 09:45 PM | #643 |
Scooby Newbie
Member#: 522286
Join Date: Feb 2021
Chapter/Region:
MAIC
Location: Central NJ
Vehicle:2009 WRX Hatch Grey |
Can datalogs help out here?
So far I've cleaned the MAF, replaced an intercooler hose (from IC to throttle body) and replaced my front O2 sensor. I also found a cut off ground connection while replacing the O2 so I fixed that as well.
Can anyone tell me if these logs say anything interesting before I keep throwing money for parts into this? My A/F learn is at 25% at idle. I am assuming this is extremely bad. Im new to datalogging so any advice on A/F learn or correction numbers for an 09 wrx would be appreciated. Thanks! https://drive.google.com/drive/folde...fk?usp=sharing This is my first NASIOC post as well. Feel free to teach me any hidden etiquette lol. |
04-10-2021, 08:31 PM | #644 |
Scooby Newbie
Member#: 341448
Join Date: Dec 2012
Location: Colorado Springs
Vehicle:2006 wrx wrc blue |
2010 WRX premium. Open source tune. P0171 code. Looked and looked and looked at possible issues, i.e. clean MAF, upstream 02 sensor, every vacuum hose and other hose I could see and/or feel. Found the previous owner was fond of zip ties instead of hose clamps. Spent an afternoon sorting that out. Ugh. Finally, way, way, under an aftermarket, larger than stock intercooler (grimmspeed), in a dark nook, found the hose from the bov, not bpv, had come loose from the intercooler. The simplest fix that someone already mentioned but who am I to listen to good advice. Occum's razor: the simplest solution is the right answer.
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07-17-2021, 08:41 AM | #645 |
Scooby Specialist
Member#: 78728
Join Date: Jan 2005
Chapter/Region:
Tri-State
Location: Jim Chunk, PA
Vehicle:04 STi PSM |
My turn!
I have an 04 Sti. Last summer I took the intake manifold and up-pipe off to replace some lines. Recently I finally had the car back all together and ready to drive. Several times I tripped the p0171. It would come on after a complete drive cycle and re-ignition, so I went down the list. -First smoke test on intake side - nothing remarkable -First smoke test on exhaust side - leaks at the turbo to downpipe, downpipe to resonator, exhaust donut to midpipe. All patched up with new gaskets and Permatex Copper Still tripped p0171 -Second smoke test on intake side - took my time and made sure to fill everything up with smoke, a few wisps coming from the turbo inlet to turbo snout connection. Tightened up the t-bolt clamp on the turbo snout to the max. -Replaced front O2 sensor. While working on the up-pipe and up-pipe to header gasket, I had removed the front O2 sensor to be able to work. Thinking back to my work, I realized I probably had the sensor dangling and banging against the header, not to mention I twisted the wires pretty good to re-install, so I may have damage it. So far this morning, I drove the car 4 miles, shut it off to finish the first drive cycle, then turned it back on. Resumed driving, got into the boost well, no returned CEL. Thank you very much to all those who contributed and to the original poster! Hopefully this CEL stays away. |
08-11-2022, 02:25 PM | #646 |
Scooby Newbie
Member#: 514930
Join Date: May 2020
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Just a high level question: Im reverting a 2006 STi to stock. It previously had TGV deletes and 740cc side feeds and was tuned with an Accessport.
Ive installed new OEM 550CC injectors and new TGV's and uninstalled the accessport. Ive checked all the usual suspects (Ive confirmed no vacuum leaks, replaced front 02 and on down the list.) but am getting immediate +25.00 fuel correction as soon as I fire up the car. Is the injector scaling for the larger injectors somehow retained when you unmarry the accessport? My only other thoughts are I received one or more bad injectors. |
08-11-2022, 02:26 PM | #647 |
Scooby Newbie
Member#: 514930
Join Date: May 2020
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Duplicate Post. Apologies.
Last edited by swedishstile; 08-11-2022 at 02:35 PM. Reason: duplicate. |
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