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-   -   More car troubles, p0171 code and sketchy starts (http://legacygt.com/forums/showthread.php?t=214823)

Giovonage 09-29-2013 10:49 AM

More car troubles, p0171 code and sketchy starts
 
So my car has a new problem. Got off work yesterday and went to start my car and it really struggled, it took 3 or 4 times to get it to turn over and idle. Once it started it had no problems running or idling at all. I got home and pulled the code and it came up p0171, system too lean. Any ideas? I was thinking maybe a vacuum leak but its strange that the engine only seems to struggle when starting up.
I've replaced the 02 sensor, the spark plugs, the coil packs, cleaned the MAF sensor, all within a couple months so i dont think its any of those...

WorldIsFlat 09-29-2013 06:26 PM

P0171 Fuel System Lean (Bank 1), if i'm not mistaken, that is the code that pulls up if you scanned with an accessport? I just recently started having that code pull up myself (but have not had the misfortune of the hard starts). I have called a few trusted Subaru friends of mine, and they have suggested cleaning my MAF (which you have noted you have already done). They also suggested that if I had played with my intake at all, to ensure that none of the lines were leaking or loose, as that may allow for unmetered air to pass by.

urabuslegacyGT44 10-01-2013 11:30 AM

im having the same problems. cold starts are fine, even after warm up idles fine, then I turn off the car when it warms up, turn it off then restart it, idle is rough and misfiring. cleaned maf, new spark plugs, checked for leaks, still no solution :(

Giovonage 10-04-2013 11:05 PM

Quote:

Originally Posted by urabuslegacyGT44 (Post 4598150)
im having the same problems. cold starts are fine, even after warm up idles fine, then I turn off the car when it warms up, turn it off then restart it, idle is rough and misfiring. cleaned maf, new spark plugs, checked for leaks, still no solution :(

Good luck man, I just found out it's my head gasket :eek: It's gonna be a doozy

rob-2 10-05-2013 10:13 AM

That code is a vac leak and a hose needs reconnecting or a zip tie.

Brian3676 10-05-2013 10:26 AM

Fuel pump

urabuslegacyGT44 10-07-2013 01:51 PM

Quote:

Originally Posted by Giovonage (Post 4601848)
Good luck man, I just found out it's my head gasket :eek: It's gonna be a doozy

I was told it was a possible head gasket too. I am throwing a p0420 too which has to do with emissions I need to get in touch with the man who tuned my car to see if its because he didn't uncheck that because I have no cat. :spin: :mad:lego problems

iNVAR 10-07-2013 02:44 PM

no cats = you have to disable p0420

ROC05lgt 10-07-2013 03:05 PM

Doesn't this code pop up when the BPV recirculation hose is disconnected under the TMIC?
You should look there

urabuslegacyGT44 10-07-2013 04:11 PM

Quote:

Originally Posted by ROC05lgt (Post 4603815)
Doesn't this code pop up when the BPV recirculation hose is disconnected under the TMIC?
You should look there

I have a FMIC and the hose is good I think its because my tuner is not familiar with legacys but if he does WRX and STI he should be able to tune mine. if he cant fix it im going to have snail performance tune it, because im sick of cheap tunes. :mad:

iNVAR 10-07-2013 04:53 PM

he's not talking to you. he's talking to guy whose thread you hijacked. ;)

urabuslegacyGT44 10-08-2013 06:06 PM

NO! .... ok you are right.. sorry guy

Giovonage 10-13-2013 01:11 PM

Quote:

Originally Posted by urabuslegacyGT44 (Post 4605129)
NO! .... ok you are right.. sorry guy

http://t5.rbxcdn.com/76fb9889a0af5b546e747bfafaf09148

ROC05lgt 10-16-2013 01:23 PM

any luck figuring this out?:confused:

TurboAWD 10-17-2013 03:35 PM

I had same problem, same code, back in August. Took long time to figure it out, but turned out it was the front O2 sensor. For whatever reason, it wouldn't regularly trip a code, and everything seemed fine, and just when the tuner was about to start pulling his hair out, the sensor failed completely.

So it was a headache, and it wasn't cheap, but it was resolved.


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