Welcome to the North American Subaru Impreza Owners Club Wednesday October 1, 2014
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Here you can view your subscribed threads, work with private messages and edit your profile and preferences Home Registration is free! Visit the NASIOC Store NASIOC Rules Search Find other members Frequently Asked Questions Calendar Archive NASIOC Upgrade Garage Logout
Go Back   NASIOC > NASIOC Technical > Service & Maintenance

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.
* Registered users of the site do not see these ads.
Reply
 
Thread Tools Display Modes
Old 09-20-2006, 07:17 PM   #1
V8killaREX
Scooby Newbie
 
Member#: 84344
Join Date: Apr 2005
Chapter/Region: MWSOC
Location: Chicago
Vehicle:
04 WRX WRB (R.I.P)
05' WRB WRX PREMIUM PKG.

Unhappy Cel 171 Lean Condition...I'm Protuned by God himself

Here's the story:

2005 WRX w/10k mi.
Cobb Turboback Exhaust(catless)
TurboXS up-pipe
Perrin Intercooler Hoses
TurboXS Short Ram
Grounding Mod

My car was protuned by God(RIFTSWRX) approximately a month ago. Conditions were HOT(94 degrees) and my car STILL put down some nice numbers...234hp/232tq, pull after pull(extremely consistent). I live in Chicago, but regardless Jorge tunes all his cars with a safe cushion. Reason I mention Chicago is because of the EXTREME changes in temp., humidity, etc. That being said, my tune SHOULD be safe for the many different changes in weather. Unfortunately today I threw a cel...that cell being p171...lean condition.

The only explanation I have is that is has been getting increasingly cold and today was the coldest day of all floating around 50 degrees. But, in theory, my tune should have the buffer zone for the change in temp. and I am a little upset as to why this code was thrown.<---This upsets me cause my tune was SUPPOSE to compensate for this if the weather is the case. I havent talked to Jorge yet, as I want some input from anyone who has experienced this, or knows what/why/where this happened. Running a very safe/basic setup which Jorge has tuned Cobb stg. 2's about a billion times, which makes me a little scared...cause since he is a master tuner, Im hoping I don't have to take it to the stealership and play that game.

Again, tuned about a month ago, running this setup for ~3k mi and no problems/cels until today! Pulls VERY smoooooothly and still does. Help, anyone?
* Registered users of the site do not see these ads.
V8killaREX is offline   Reply With Quote
Old 09-20-2006, 09:08 PM   #2
V8killaREX
Scooby Newbie
 
Member#: 84344
Join Date: Apr 2005
Chapter/Region: MWSOC
Location: Chicago
Vehicle:
04 WRX WRB (R.I.P)
05' WRB WRX PREMIUM PKG.

Question

My guess(crosses fingers) is that I need to clear the ECU and have it 'learn' the new weather....but shouldnt the ECU adapt anyways??

Any input guys, please, even if its 1 sentence...it makes me uneasy knowing my baby is sick.
V8killaREX is offline   Reply With Quote
Old 09-20-2006, 09:18 PM   #3
johsti
Scooby Specialist
 
Member#: 36049
Join Date: Apr 2003
Chapter/Region: BAIC
Location: San Jose
Vehicle:
2014 FXT Premium
Silver

Default

It's possible that it's the tune, but I doubt it. I have been dealing with a P0171 for the past month or two. Mine showed up about a month after I was protuned. I took it back to the tuner and he double checked everything to make sure the problem wasn't with the tune.

I then found this thread and started going through all of the possible fixes

http://forums.nasioc.com/forums/show...ighlight=p0171


After a lot of troubleshooting, I think I finally fixed my problem. The turbo inlet pipe was not making a good seal on the turbo end. the clamp was very loose, so I tightened the clamp and the CEL hasn't been back.

Good luck
johsti is offline   Reply With Quote
Old 09-20-2006, 09:44 PM   #4
V8killaREX
Scooby Newbie
 
Member#: 84344
Join Date: Apr 2005
Chapter/Region: MWSOC
Location: Chicago
Vehicle:
04 WRX WRB (R.I.P)
05' WRB WRX PREMIUM PKG.

Lightbulb

Thanks for the link...I would think the tune being the issue it would have happened like the week or two after...a leak sounds more like it(which is gonna suck finding it). But when I installed everything(with a friend as help/2 heads are better than one, even though its simple stuff), we took are time as the installs were fun/rewarding/and want to MAKE SURE EVERYTHING WAS %100000 correct.

It's a 50/50 shot right now as the this happened right when it got really cold...which makes me think it could be the tune; but the temp. could cause stuff to expand/due funny stuff.

The fun begins.
V8killaREX is offline   Reply With Quote
Old 09-20-2006, 10:12 PM   #5
hondaeater69
Scooby Guru
 
Member#: 60324
Join Date: Apr 2004
Location: a pillow.
Default

i'm curious as to what the ECU uses to determine this "lean" conidtion, considering it doesn't use a WB 02 sensor. i wonder if somehow your car is stuck/reverted back to some OEM style CL/OL fueling crossover. . . that would cause a nice lean condition on a protuned car.

Get a WB and do some logs for the real answer
hondaeater69 is offline   Reply With Quote
Old 09-20-2006, 10:46 PM   #6
V8killaREX
Scooby Newbie
 
Member#: 84344
Join Date: Apr 2005
Chapter/Region: MWSOC
Location: Chicago
Vehicle:
04 WRX WRB (R.I.P)
05' WRB WRX PREMIUM PKG.

Default

My car doesnt feel any different.

Is the engine gonna go boom if i drive hard???

I did some WOT pulls 1-4 and everything seems the same.

Dumb question. Would it be absolutely stupid to go to the midwest subaru shootout this sat.?
V8killaREX is offline   Reply With Quote
Old 09-20-2006, 10:48 PM   #7
hondaeater69
Scooby Guru
 
Member#: 60324
Join Date: Apr 2004
Location: a pillow.
Default

the code is there for a reason. . . I wouldn't personally drive my car hard if it even thought it may be running lean until i figured out the real problem.

I don't know what that link is above, but have you checked for a post MAF intake leaks? like the turbo inlet. . . letting in air post MAF will throw off AFR's and make you leaner than you should be.
hondaeater69 is offline   Reply With Quote
Old 09-21-2006, 12:06 AM   #8
V8killaREX
Scooby Newbie
 
Member#: 84344
Join Date: Apr 2005
Chapter/Region: MWSOC
Location: Chicago
Vehicle:
04 WRX WRB (R.I.P)
05' WRB WRX PREMIUM PKG.

Default

I guess a leak COULD have just happened....but

1. The car has only ~10k mi...could tear/leak happen so soon?
2. Its been almost a whole month since my protune with no ill effects whatsoever...thats a long time for a problem to pop up.
3. The temp JUST starting drastically changing, today being the coldest of days, and coincidentally I get the code today...early in the morning when its coldest.
4. Could it be the fact that I'm running my injectors at almost %100 towards redline?....I have NEVER read a thread about maxing out injectors on the stock turbo, yet my car did, and Jorge said its not uncommon.
V8killaREX is offline   Reply With Quote
Old 09-21-2006, 12:45 AM   #9
RiftsWRX
Scooby Guru
 
Member#: 6124
Join Date: Apr 2001
Chapter/Region: MWSOC
Location: Glendale Hts, IL, USA
Vehicle:
2000 NFR AP1 S2000
'07 Honda FIT sport (5MT)

Default

Quote:
Originally Posted by V8killaREX View Post
I guess a leak COULD have just happened....but

1. The car has only ~10k mi...could tear/leak happen so soon?
2. Its been almost a whole month since my protune with no ill effects whatsoever...thats a long time for a problem to pop up.
3. The temp JUST starting drastically changing, today being the coldest of days, and coincidentally I get the code today...early in the morning when its coldest.
4. Could it be the fact that I'm running my injectors at almost %100 towards redline?....I have NEVER read a thread about maxing out injectors on the stock turbo, yet my car did, and Jorge said its not uncommon.

1: yes...
2: that's a good thing. problems show up within hours of being tuned, not weeks.
3: system lean/rich codes are based on O2 sensor feedback telling the car to trim itself beyond a +- 14.8% range. Each and every car has it's intake dialed in so that there is never more then a +-5% LTFT (long term fuel trim, if you're wondering). Which leads to....

4: IDC is max'd at redline. Under WOT, fuel trim is no longer modified, so any learnt fuel trim happened under idle/cruise conditions.

That being said, system too lean indicates a mass air flow compromise. Meaning, you're sucking in unmetered air, which drives the mixture lean, then the O2 sensor sees it, and "trims" itself to add more fuel to compensate for the leak (there's that compensation you're wondering about....). Typical places are anywhere after the MAF but before the compressor. READ: the inlet hose region. Which, as was mentioned, is a common point of failure.

Finally... www.projectwrx.com/caringforyourvehicle.pdf <- read that... especially chapter 3....

So after reading that... NO... you shouldn't be beating on your car. Yes... it's most likely a popped vacuum line. Finally, in response to your PM.... No, don't go to the shootout until you figure it out.

And finaly, call me next time...

Jorge (RiftsWRX)
www.ProjectWRX.com
RiftsWRX is offline   Reply With Quote
Old 09-21-2006, 03:01 PM   #10
V8killaREX
Scooby Newbie
 
Member#: 84344
Join Date: Apr 2005
Chapter/Region: MWSOC
Location: Chicago
Vehicle:
04 WRX WRB (R.I.P)
05' WRB WRX PREMIUM PKG.

Smile

Even though this issue doesn't take a rocket scientist to figure out, and for the millionth+1 time, Jorge, you are a genius

AS IT STANDS, problem is SOLVED!!!!!!!!!!!!!!!!!

Yesterday b4 work, I took a look under my hood(looked for a whole 5 min., without removing intercooler,intake,etc.) without finding anything wrong/out of the ordinary. As I stated b4, my friend and I took our sweet @ss time doing the exhaust, intake, uppipe, intercooler hoses to make sure we were %100000 percent sure everything was LITERALLY PERFECT.....so I was %100000 certain it wasn't the install/leak. But since the ECU was telling me there WAS something wrong, you start to question EVERYTHING<----tune, install, factory issue, "was that slight noise I heard 2 months back ACTUALLY a problem?", etc, etc. And after reading http://forums.nasioc.com/forums/show...ighlight=p0171
I was so pissed at not only the fact that it could be a NUMBER of things, but the fact that I bought/installed everything the RIGHT way, not the cheapest/easiest way.

So anyways, I get back from my 8am class this morning, and decide to disconnect the neg bat terminal to reset the ECU hoping that the ECU needs to 'learn' the new weather(which it is suppose to do on its own, but in a time like this, you will do anything/everything) or maybe some bad gas, etc, etc. After I disconnect/reconnect the term. I start to look around some more. As I'm looking around, I find Waldo, and throw my hands in the air screaming YES!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

It was some hose(size of the restrictor pill hose) with some black plastic/metal "thingy" that had I believe 2 hoses going into it...these hoses went to the intake(AFTER the MAF, Jorge=genius), and the other to I believe the left side intake manifold. It was disconnected at the manifold part, so I plugged it back in and drove to my next class with no lights, and a GREAT peace of mind. Saturday Shootout HERE I COME!!!!!!!!!!!

If you are reading this thread and don't have a problem, you are probably like who cares, etc, which, is perfectly fine/normal. But the day you throw a cel and come across something like this, you look at things much differently. Not saying you will start reading threads like these, but it will make you very fortunate to have a perfectly running car.<----IF YOU MODIFY YOUR CAR IN ANY WAY, SAVE YOURSELF THE EXTREME FRUSTRATION AND DO IT THE RIGHT WAY!!! Not saying I did it the wrong way, but doing it the wrong way will lead to many cels. It's really a scary experience, as I am a college student who can't afford/dont have time to deal with issues like these....regardless of college/money, nobody likes problems.

Lessons Learned:
I am EXTREMELY fortunate that the diagnosis for my cel took less time than it would to refill your windshield wiper fluid. When it comes to leaks/cels that MAY be a leak/loose connection, etc; it's like Where's Waldo...I thought I looked thoroughly yesterday and apparently I didn't(it is a sneaky connection/place). Get a friend to help you find the leak/loose hose. Lastly, it feels good to contribute to the community that gives me so much

I am so happy, I can't resist!
V8killaREX is offline   Reply With Quote
Old 08-07-2013, 10:30 PM   #11
thomasfranz
Scooby Newbie
 
Member#: 362740
Join Date: Jul 2013
Default p0170

I have been having a p1070. i have a 2002 wrx running a stage 2 AP tune. i had a system too lean and a bad o2 censor cel, so i replaced my front o2 censor thinking it was going to clear both. and i still have the too lean. i have cleaned my maf, checked spark plug gaps/coils, checked my fuel pump. the only thing left i can think of is a bad mafs or a boost leak but all my hoses look fine. my target boost is 18 psi and im only hitting 9-12, anyone have any ideas? I dont have any rough idle or poor gas mileage, just a loss of power/suffocation at WOT.
thomasfranz is offline   Reply With Quote
Old 08-08-2013, 06:17 AM   #12
Bru1212
Scooby Newbie
 
Member#: 178770
Join Date: Apr 2008
Chapter/Region: NESIC
Location: Western,MA
Vehicle:
06 STi
04 FXT

Default

Quote:
Originally Posted by thomasfranz View Post
I have been having a p1070. i have a 2002 wrx running a stage 2 AP tune. i had a system too lean and a bad o2 censor cel, so i replaced my front o2 censor thinking it was going to clear both. and i still have the too lean. i have cleaned my maf, checked spark plug gaps/coils, checked my fuel pump. the only thing left i can think of is a bad mafs or a boost leak but all my hoses look fine. my target boost is 18 psi and im only hitting 9-12, anyone have any ideas? I dont have any rough idle or poor gas mileage, just a loss of power/suffocation at WOT.
Have you ever cleaned/replaced your fuel filter? If not try that.
Bru1212 is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
CEL 171 after up-pipe install stilov Service & Maintenance 4 05-23-2005 10:45 PM
lean condition on 1.8L w/intake & exhaust? RaceCarRiot Normally Aspirated Powertrain 1 01-08-2002 04:38 AM
lean condition KITTbri Normally Aspirated Powertrain 4 02-23-2001 12:48 AM
Cheap way (under $200) to correct lean conditions? Overtime Technical Forum Archive 0 08-29-2000 07:10 PM


All times are GMT -4. The time now is 02:48 PM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2014 Axivo Inc.
Copyright ©1999 - 2014, North American Subaru Impreza Owners Club, Inc.