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Old Today, 12:01 AM   #1
Scooby Newbie
Member#: 414768
Join Date: Feb 2015
Default 08 WRX, P0171, and Reading Logs. PLEASE HELP

Hey guys, so I got my first WRX this year, and I love it. Threw my first CEL tonight, and now i'm freaking out because I have no idea where to begin.

It just came on as I was driving (normally). I've noticed over the last few days as its gotten colder, the idle is a bit rough but not all the time. However once the CEL showed up, my car went into limp mode.. cruise was flashing, traction control was lit up, anxiety was building. My average MPG has fluctuated between 18-22 mpgs..It goes up as I'm driving, down when idle over the last couple of days. I was at 19 MPG at cold start today, by the time I got to work I was at 21 MPG. Before all this I was constantly at 21.9 MPG.

Everything I read refers to MAF, o2 sensor and vac. hoses, but like I said, I have no idea where to begin. Especially with the vac. hoses, THERE ARE SO MANY. I've reset the ECU via the Cobb AP

Car is on stage 1 Cobb Ots map, all stock at around 72k, i've attached my Cobb data log in hopes someone can see the error my ECU sees and help me resolve this.


ANY help is appreciated!
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Old Today, 07:36 PM   #2
Scooby Guru
Member#: 171948
Join Date: Feb 2008
Chapter/Region: Tri-State
Location: new york
08 wrx vf52 swap
best et,12.6@108.7


i could be your intake manifold gaskets.i just changed mine. its a known issue on 08s. read through this thread.
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Old Today, 10:51 PM   #3
Scooby Newbie
Member#: 414768
Join Date: Feb 2015

Thank you for the reply! I was afraid this fell on deaf ears. That is a good read and a place to look.. however the rough idle seems to have disappeared in wake of my CEL. Also, it would stutter and shake even when fully warmed up, like the A/C is kicking on. I assumed it was just because I had the heat on and the weather was cold.

Once i cleared the ECU, the CEL has not returned. The effects of the CEL are still present though. My max boost on Cobb OTS 1 is capped at 11.8. Gas mileage is inconsistent, by that I mean the average MPG shouldn't vary between 2-5 MPG every time I drive. I can actually watch it improve as im giving the car gas on the highway, and watch it decrease when I go into neutral and just cruise. The RPM's have bounced between 1500 and 750 when idling as well.
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