running lean
05-15-2004 | 11:10 PM
#1
Guest
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running lean
the code p0171 pops up saying i am running too lean,i had my up,down and catback exhaust on for a few days now and not the code pops up yesterday, i unpluged the battary and after a half hour of driving it poped up again, what could be the problem, could the front o2 sensor be loose?
05-16-2004 | 02:18 AM
#2
Registered User
iTrader: (7)
Joined: Dec 2002
Posts: 10,029
From: Sacramento CA
Car Info: 02 Impreza WRX sedan
It might actually be running lean. An catless uppipe, free-flowing downpipe and catback is a significant amount of backpressure reduction and best power will come from tuning. Most Subaru tuners offer off-the-shelf reflash maps for these mods.
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05-17-2004 | 08:48 AM
#6
Registered User
iTrader: (12)
Joined: Nov 2002
Posts: 440
From: bay area, CA
Car Info: 02 WRX wgn full STI swap
it could be a zillion things... I've been battling that code for weeks. Even put my car completely back to stock and still have it. Cars runnning great. Start looking at hoses around the turbo and intercooler. A common one I've heard is the small vacum hose on the lower side of the BOV can pull of pretty easy. My best guess on mine wont be answered untill I get my turbo inlet hose.
I've changed my turbo a fews times and the hose clamp joining the turbo to the inlet pipe chews away and tears a hole in the inlet pipe, allowing your turbo to pull in small amounts of unfiltered air from under the hood.
If you do a search for the code a both clubs, you'll find that this is a very common code with lots of possible fixes.
Ash
I've changed my turbo a fews times and the hose clamp joining the turbo to the inlet pipe chews away and tears a hole in the inlet pipe, allowing your turbo to pull in small amounts of unfiltered air from under the hood.
If you do a search for the code a both clubs, you'll find that this is a very common code with lots of possible fixes.
Ash
05-21-2004 | 12:25 AM
#8
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Originally Posted by supra_man
why dont you get a BOV so you will run rich. wouldnt that cancel things out???
in conclusion i believe that the up pipe and turbo back exhaust made the car have to much boost for the bov and made it always open a little bit so it was running to lean so this stronger bov maid it not vent as soon so it runs good now. but its way quieter than i expected.
05-21-2004 | 02:51 AM
#9
Registered User
Joined: Jun 2003
Posts: 564
From: In my SUBY!!!
damn i didnt think it would actually work, well in theory anyway cause everyone runs rich with a BOV so i figure why not try that. hey what kind of supra does your buddy have i had a mk111 till i got my suby.
05-21-2004 | 12:51 PM
#11
Registered User
iTrader: (12)
Joined: Nov 2002
Posts: 440
From: bay area, CA
Car Info: 02 WRX wgn full STI swap
I dont' think I'm a noob, but I dont see how much help a BOV would be if you're running lean. The lean condition happens under normal cruising at less than 60% throttle. I understand that venting the boost off into the atmosphere will prevent it from throwing the air back into the intake, but I don't think you could call it the source of the problem. You should prove it first by resetting the light and then watch very carefully to see if it comes on right when the valve blows off. I'm willing to bet the BOV isn't doing anything when the sensor's reading the prob.
On a side note, I think I just solved my P0171 problem. I read that people were getting this to happen after going back to stock injectors (what I did) because the fuel in the injectors crystalized during non use abd clogged them. I just ran through a second tank of fuel system cleaner and the problem apears to be corrected.
When was the l;ast time you changed your fuel filter??? The maint. schedule says to do it at 30k service intervals. Mine threw me a P0171 code at 23k and because my fuel filter was mucked up. Damn CA gas sux!
Ash
On a side note, I think I just solved my P0171 problem. I read that people were getting this to happen after going back to stock injectors (what I did) because the fuel in the injectors crystalized during non use abd clogged them. I just ran through a second tank of fuel system cleaner and the problem apears to be corrected.
When was the l;ast time you changed your fuel filter??? The maint. schedule says to do it at 30k service intervals. Mine threw me a P0171 code at 23k and because my fuel filter was mucked up. Damn CA gas sux!
Ash
05-21-2004 | 11:17 PM
#12
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Posts: n/a
Originally Posted by Ash
I dont' think I'm a noob, but I dont see how much help a BOV would be if you're running lean. The lean condition happens under normal cruising at less than 60% throttle. I understand that venting the boost off into the atmosphere will prevent it from throwing the air back into the intake, but I don't think you could call it the source of the problem. You should prove it first by resetting the light and then watch very carefully to see if it comes on right when the valve blows off. I'm willing to bet the BOV isn't doing anything when the sensor's reading the prob.
On a side note, I think I just solved my P0171 problem. I read that people were getting this to happen after going back to stock injectors (what I did) because the fuel in the injectors crystalized during non use abd clogged them. I just ran through a second tank of fuel system cleaner and the problem apears to be corrected.
When was the l;ast time you changed your fuel filter??? The maint. schedule says to do it at 30k service intervals. Mine threw me a P0171 code at 23k and because my fuel filter was mucked up. Damn CA gas sux!
Ash
On a side note, I think I just solved my P0171 problem. I read that people were getting this to happen after going back to stock injectors (what I did) because the fuel in the injectors crystalized during non use abd clogged them. I just ran through a second tank of fuel system cleaner and the problem apears to be corrected.
When was the l;ast time you changed your fuel filter??? The maint. schedule says to do it at 30k service intervals. Mine threw me a P0171 code at 23k and because my fuel filter was mucked up. Damn CA gas sux!
Ash
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