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Old 06-17-2009, 07:38 PM   #176
Psyk
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Quote:
Originally Posted by Darryl View Post
good luck. hope that does the trick!
Darryl
Thanks very much; truely appreciated!

Quote:
Originally Posted by MYfirst00 View Post
Get some hex head screws with the same thread pitch and length. So much better than phillips head screws for this part.
Yep I replaced the screws; so much better!

Well I finished cleaning everything and stuck the new gasket in and took it for a quick ride. At first it was still a little rough, but it seems to be (hopefully!) running great right now! I'm about to take it for another quick ride so I'm really hoping this did the trick!
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Old 06-17-2009, 08:06 PM   #177
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Drive 17 miles, turn the car off/on and drive another 1. Keep your fingers crossed on the last 1.
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Old 06-18-2009, 12:43 AM   #178
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Well on the second ride it threw a cel, but was running ok still so I cleared it and am waiting to see if it comes around again; I'm really hoping it doesn't.
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Old 06-24-2009, 06:16 PM   #179
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Well the cel is back and is running crappy on cold startup (idles between 1k and 2k). I took it to a friend of my father's who owns a Volvo specialty shop to see if he could maybe help out (he said that a bunch of Subaru guys come to him all the time about different stuff). He said that he thinks its a possibility of 1) the k&n filter is blocking air thus not allowing enough air in and 2) possibly a bad rear o2 sensor. (To be clear; he means that maybe there's still way too much oil on it not allowing the air to enter)

Does anybody have an idea about either of these recommendations? I may pick up a new filter either way just to be safe, but I don't want to waste money on a rear o2 for nothing! I'm also going to throw in some Techron Fuel system cleaner once the tank runs near empty and see if that maybe helps. I really don't see how it could be the rear o2, but at this point who knows!
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Old 06-24-2009, 06:24 PM   #180
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Rear o2 sensor doesn't have anything to do with this problem my bet will be front o2 sensor, at least that was my problem, as far for your k&n filter just clean it with alcohol and try that first.

PS: Since I replace my front o2 sensor no more P0171 or bad AFR
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Old 06-24-2009, 07:41 PM   #181
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Relating to this problem, are we talking the A/F sensor on the passenger manifold, or the front O2 sensor on the up pipe?

I've just got done replacing my up pipe because it was cracked, as well as all front exhaust gaskets, and the turbo waste gate actuator. Still came back. Now that stuff is out of the way, the boost problem is more apparent. When I put the pedal to the floor in 4th gear, the boost spikes up to .125 bar, then down close to 0 bar and stays there. The performance reflects what the gauge is showing.

Last edited by MYfirst00; 06-24-2009 at 07:50 PM.
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Old 06-24-2009, 07:42 PM   #182
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Quote:
Originally Posted by Psyk View Post
Well the cel is back and is running crappy on cold startup (idles between 1k and 2k). I took it to a friend of my father's who owns a Volvo specialty shop to see if he could maybe help out (he said that a bunch of Subaru guys come to him all the time about different stuff). He said that he thinks its a possibility of 1) the k&n filter is blocking air thus not allowing enough air in and 2) possibly a bad rear o2 sensor. (To be clear; he means that maybe there's still way too much oil on it not allowing the air to enter)

Does anybody have an idea about either of these recommendations? I may pick up a new filter either way just to be safe, but I don't want to waste money on a rear o2 for nothing! I'm also going to throw in some Techron Fuel system cleaner once the tank runs near empty and see if that maybe helps. I really don't see how it could be the rear o2, but at this point who knows!
Have you checked your MAF? The K&N is known for getting its oil on the MAF and blocking proper sensing.
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Old 06-24-2009, 07:45 PM   #183
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Originally Posted by CyborgX_CZ View Post
Rear o2 sensor doesn’t have anything to do with this problem my bet will be front o2 sensor, at least that was my problem, as far for your k&n filter just clean it with alcohol and try that first.

PS: Since I replace my front o2 sensor no more P0171 or bad AFR
I've actually already replaced the front o2 sensor a few months ago, so I don't believe that could be the culprit this time around. It did fix the problem but has since come back.

Quote:
Originally Posted by MYfirst00 View Post
Have you checked your MAF? The K&N is known for getting its oil on the MAF and blocking proper sensing.
I've cleaned my stock maf multiple times and even replaced it to see if it was the problem (it wasn't so I stuck my original back in).
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Old 06-24-2009, 07:50 PM   #184
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I've cleaned my stock maf multiple times and even replaced it to see if it was the problem (it wasn't so I stuck my original back in).
Gotcha. I didn't know how much you've done. This code blowwwwws.
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Old 06-25-2009, 08:55 AM   #185
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Quote:
Originally Posted by Psyk View Post
I've actually already replaced the front o2 sensor a few months ago, so I don't believe that could be the culprit this time around. It did fix the problem but has since come back.



I've cleaned my stock maf multiple times and even replaced it to see if it was the problem (it wasn't so I stuck my original back in).

Well my o2 sensor was 3 months old that's why I spend like 5 weeks tracking down all issues and leaks and at the end I try replace my o2 sensor and that was my problem. So don’t count on that, if you could borrow o2 sensor I will try that first.
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Old 06-25-2009, 02:15 PM   #186
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Can the front o2 be cleaned with CRC stuff?
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Old 06-30-2009, 08:37 PM   #187
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Well just to update:

After talking with my father's friend, I decided to throw the stock intake back in and see how it ran. Who would have guessed; it runs beautifully ever since! Since this is the case, I'm assuming that he was right and that the filter was blocking air from coming in. I will be picking up a new k&n filter when I have the money, but I'm leaving in the stock intake until than.

Now I just hope I pass inspection tomorrow! haha. Wish me luck


Edit: I actually passed inspection! The guy said he could have failed me because my blinker was too fast, but he let it go, haha.

Last edited by Psyk; 07-02-2009 at 01:27 AM.
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Old 07-07-2009, 10:56 PM   #188
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I'd like to give my final post in this thread because I am cured of the P0171 code. After tapping into the ECU, we found my MAF was faulty but not throwing any MAF codes.

This shows my airflow ratings being maxed out at all levels with the former MAF, as well as knock:



And this shows my airflow ratings with my new MAF from an 05 STi.



Looks like a perfect reading now with no knock. The code was delayed from coming back after properly cleaning up in the MAF and not just the IAT sensor (droplet). We noticed the reading was still messed up after the proper cleaning.

So in the end, my problem was the MAF.
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Old 07-07-2009, 11:07 PM   #189
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same exact thing happened to me, no maf codes only p0171 and it was my maf.
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Old 07-15-2009, 01:02 AM   #190
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bump - I'm another guy who had a long running p0171 that I did nothing about for a year, since the car (daily driver) basically ran fine, but would shudder like mad at 4k-5k rpms in higher gears. Finally bought a $6 can of CRC MAF cleaner and cleaned the hell out of the MAF & cleared the code, and all is well. So nice to have a fully functioning car again, and no orange light of shame...

For those who haven't really cleaned a MAF - the hot wires are kind of hidden. Make sure you give both the temp sensor (amber bulb) and mass sensor (2 hidden platinum wires) 10 good moderate blasts of cleaner. Clean all the electrical contacts while you're at it.
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Old 07-15-2009, 07:19 AM   #191
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Thumbs up so far, so good

ever since my last clearing of the p0171 code (about three months now), it has not returned. The car ran great even when the light was on, and continues to run just fine (even with 57k on the plugs!). I just don't have a clue as to what triggered the cel, or why it has not returned. Oh well. Sometimes it's better to be lucky than to be good.
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Old 07-17-2009, 07:50 PM   #192
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Hey everyone, I did some reasearch and came along this thread which is pretty much my problem right now.


I am in Waco, Texas right now. I drove my 2002 WRX here from NJ. That's 1,600 miles straight. I threw a CEL a few times up to this point and I was unable to check it so I just reset my ECU a few times.

Then I drove through some horrible rain, and ever since about that time my car has been acting funny. Although, I had already cleared previous CELs by this point. I noticed that on the highway my car was not 100% but not nearly as bad as it was at low RPMs when getting into boost to accelerate. So I took it easy, and kept RPMs constant and drove all the way here that way without boosting at all.

I finally got to the local Autozone here and checked my CEL. It was the P0171 "System Too Lean". I was blowing black smoke for a while and today it appears to have went away.

From what I know, black smoke means unburnt fuel. It doesnt necassarily mean Im running RICH but it means fuel is not being burnt sufficiently.


So now Im in Waco TX. I dont want to bring it to a shop if they dont know **** about these cars.

So now I dont know what to do....

First Im going to clean the MAF ASAP with crc maf cleaner.
Then change the fuel filter.
Then add 2 bottles of injector cleaner and rev it.
Then change the air filter.
And I would like to have my plugs changed but only by someone who knows what theyre doing as Ive done everything to my car but I dont want to do the plugs myself.

Im going to log right now with RomRaider to see if my AFR fluctuates at all even at idle. This would confirm that my o2 sensor functions even though Im not getting any other CEL for the entire trip except for the P0171.(my o2 sensor was replaced 8000 miles ago because it had failed, and at that time I had a CEL for it specifically when it failed and i noticed in RomRaider that it was constantly at 14.7 which was shady lol)

Like I said my car was blowing black smoke, veryyyyyy hesitant at low RPMs and still is acting funny but not as bad as last night. At WOT it seems to be OK but Im not boosting until I get it taken care of.


Im running the XPT STAGE 2 RACE MAP which requires a CAI.

I know that I most definetely sucked up some water and that could have fouled a plug, (even though no CEL for that) which could cause the black smoke because there is no spark to burn that fuel n that bank.

Or the water either damaged the MAF sensor or it just needs to be cleaned. Once again, no CEL for that either.



Anyone local around Waco, Texas want to meet up and check it out?
or know of a smart mechanic around here to have a look without charging me?


As soon as I figure this out and get it running great again, I was planning to drive down to Austin to meet up with Braden from XPT so that he could check/log/fine tune my car. But I dont want to drive it anymore than I already have with it running like this.

I also added Octane booster at every other fill up as I got more down south and it did feel better after every fill up, but still not 100% especially not at low rpms while accelerating.


Get back to me. My cell is 9734936037 txt or call me if youre around here.
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Old 07-18-2009, 09:49 AM   #193
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hey Money,
may I suggest you also post in the Texas forum/ You might get a quicker response that way. Good luck.
Darryl
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Old 07-18-2009, 12:40 PM   #194
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thanks i will post in the texas forum too
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Old 07-18-2009, 01:20 PM   #195
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thanks i will post in the texas forum too
hope it works out for ya.
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Old 08-19-2009, 11:41 AM   #196
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In my 2 month long struggle with this code, I found:
-My temperature sensor was reading 2 degrees higher than it should have.
-There was a small crack in the hose that connects the PCV plastic splitter to the block.
-There was a crack in the passenger side breather hose that connects to the intercooler "crosspipe". The crack was underneath the visible area.
-The screws that tighten the intercooler aluminum elbows were not quite tight, borderline loose.
-The MAP sensor (not MAF) was showing pressure fluctuations with engine not started. I cleaned it with MAF sensor cleaner and this kinda cured the fluctuations. By the way, the MAP sensor is shown in the troubleshooting guide in the factory manual, for the 0171.
-Techron injector cleaner made the code go away for the duration to the tank-ful of gas that contained it. This was very confusing.

And the biggest, worse problem was that I lacked a gasket by the passenger side plastic breather box. I took that box out to gain access to the injectors, sometimes i work in the dark, with a flashlight, so it must have fallen, without me noticing. I silicone boxes, so there was enough silicone there to make this a partial leak and confuse me. Also, there's a ridge on the mating surface of the box, which can look like a rubber o-ring style gasket.
Unfortunately, I had that box out at least 3 times in the process, so I don't know when I dropped it.

By the way:
If you want quiet injectors and you have DW dark blue injectors on a 2002 or 03 WRX, the dark blue ones are 3 milimeters longer than the OEM ones. Use spacers under the fuel line bracket.
Without spacers the injectors become quite loud. But the acceleration seems a bit crisper.
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Old 09-01-2009, 07:32 PM   #197
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Thanks to the OP for the write-up. It has certainly helped me work through a few issues.

I've been troubled by a sudden idle problem and a P0171. Cleaned the IAV, MAF, changed plugs, back to stock airbox/OEM filter. I have noticed that on my '03 almost all of the hoses are hard and brittle especially the small vacuum lines. So the culprit looks like it may be a cracked hose somewhere. I just swapped the Samco accessory hoses for most of the big lines, but I'm wondering is someone has a diagram of the smaller vacuum lines that are on the WRX motor. Which one is for the FPR?

Does anyone see a problem with swapping the black rubber with silicone in the same diameter. I'm really shocked at how hard and brittle all of the smaller rubber lines are.
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Old 09-01-2009, 07:47 PM   #198
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Some OEM hoses, such as the small diameter grey ones are for high temperature.
Some otherones are for oil resistance, like the PCV.
Silicone may not handle either well.
I think silicone becomes very soft with temperature, make sure to clamp everything well.
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Old 10-12-2009, 04:55 PM   #199
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Quick question about P0171.
This code popped up last week after a weekend playing in dirt with my car. Figured it was either a vac leak or dirty maf. Just took the maf out and cleaned it, will the CEL turn off if that was the problem, or do I have to reset it and wait and see if it pops back on in a few days?
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Old 10-12-2009, 05:27 PM   #200
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Default well I'l be a ...

After a couple of months that little code showed up again. Too many things to check to suit me. I just cleared it. I noticed that it came on while I was in 4th gear, and had let the RPMs drop a bit low when I applied a bit of throttle. Maybe it was a lean condition or something that caused it? So far it's been four days and no repeat so far.
darryl
PS Fred, you need reset it and wait and see. The ecu won't reset itself.

Last edited by Darryl; 10-12-2009 at 05:28 PM. Reason: explosive diarrhea!
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