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Old 07-11-2013, 04:34 PM   #1
ksantarina
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Member#: 314667
Join Date: Mar 2012
Chapter/Region: SCIC
Location: NYC
Vehicle:
2012 STi
SWP

Default P0301, P0302, PFFFFF - 2012 STi. Crap.

2012 STi Stage 1 93 + AEM, ~17,000 miles.
AEM CAI Intake
Samco Intercooler Hose Kit
Nameless Performance Axleback

I have 17,000 miles on the car, maybe 10,000 on the Stage 1 tune. I originally ran the Stage 1 93 + SF Intake but experienced intermittent CELs. This CEL would ONLY come up at high RPM when I'm pushing the car, however there would be no loss of power at all. This behavior was super inconsistent, as it would come on randomly sometimes then disappear, then come back and stay on. The only weird thing I would feel is a very slight bucking and hesitation in 5 and 6th gears around 3-4k RPM. Maybe plugs? At the time I attributed to the Cobb SF intake and MAf sensor.

This would happen maybe once every 2 or 3 months. After a little while, I took the Cobb intake off and switched to the AEM CAI. Cleaned the MAF sensor like a mothereffer but then again the CELs came back JUST like night while pushing in S#.

Same scenario, pushing the car slightly in S#, CEL/limp mode lit up my dashboard like a Christmas tree. Still no loss in power, no bucking, no white smoke or oil anywhere, clean idle, etc. Not sure if it matters, but I've been pumping 93 gas from BP.

I've tried to replicate this issue on the stock airbox on the stock tune but no dice. Is it possible to just take the car to the dealership and have them do a compression and leakdown test? I've seen other threads where this could cost up to 200 bones.

At this point I think its time to do a couple things:

- inspect, possibly change, spark plugs
- inspect coil packs - any tips on this? I heard swapping is a good test
- clean/ replace MAF sensor
- return to stock, and sell the damn thing.

Any tips or suggestions. For anyone whose been through a similar scenario, any light you can shed? Getting a little frustrated here

Thanks for taking the time out! Stay safe everyone.
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Old 07-11-2013, 04:44 PM   #2
CatfaceType-R
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Join Date: Feb 2005
Chapter/Region: MWSOC
Location: I sell platinum cat jewelry.co
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Get a protune from a REPUTABLE tuner.
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Old 07-11-2013, 04:47 PM   #3
Andrewxxcarlson
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Member#: 316415
Join Date: Apr 2012
Location: Elk Grove, CA
Vehicle:
2006 WRX
WRB

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Ferreal man ^^
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Old 07-11-2013, 05:11 PM   #4
ksantarina
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Join Date: Mar 2012
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Location: NYC
Vehicle:
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SWP

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Quote:
Originally Posted by CatfaceType-R View Post
Get a protune from a REPUTABLE tuner.
Actually, I forgot to list that in the possible next steps. I'm waiting to pull the trigger on a DP, CBE, and ECBS, and a Protune. It's definitely on the roadmap, but probably something not in the near future. I just want to make sure it doesn't blow up before then.
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Old 07-11-2013, 07:02 PM   #5
Blackfin
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Member#: 361325
Join Date: Jul 2013
Chapter/Region: E. Canada
Location: Ontario
Vehicle:
2010 STi
Dark Gray Metallic

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Getting nervous here. I'm picking up a 2010 STi hatch, my first Subaru, on Saturday and reading all these stories of potential ring land damage happening on lightly-modded cars is scaring the hell out of me.

I've got a 2002 Mustang 4.6 with an intercooled Kenne Bell blower on it and at 9-psi it's putting right around 400rwHP. This engine has fragile hypereutectic pistons but will live at that power level pretty comfortably with conservative timing and fat fuel. I can't blame Ford for using these pistons in a naturally aspirated engine but I'm really disappointed to see that a factory turbo motor was qualified with glass pistons.

I'm trading my beloved 1.8T GTI on this STi. With that motor guys will often pull the head and pan, push the pistons and rods out, swap to a set of Integrated Engineering rods and, using the factory pistons and rings, deglaze and reassemble and get 400whp with a BT swap. Why the hell couldn't Subaru have used stronger internals on this engine?


Anyway, maybe I'm jumping to conclusions here. OP, you say "I've tried to replicate this issue on the stock airbox on the stock tune but no dice." IOW, if you put the stock box back on you don't get misfires and cluster Christmas trees anymore? If so, maybe the motor itself is okay internally and you either need to stay stock or get a proper tune as advised by others.
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Old 07-11-2013, 07:23 PM   #6
CatfaceType-R
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Quote:
Originally Posted by Blackfin View Post
Getting nervous here. I'm picking up a 2010 STi hatch, my first Subaru, on Saturday and reading all these stories of potential ring land damage happening on lightly-modded cars is scaring the hell out of me.

I've got a 2002 Mustang 4.6 with an intercooled Kenne Bell blower on it and at 9-psi it's putting right around 400rwHP. This engine has fragile hypereutectic pistons but will live at that power level pretty comfortably with conservative timing and fat fuel. I can't blame Ford for using these pistons in a naturally aspirated engine but I'm really disappointed to see that a factory turbo motor was qualified with glass pistons.

I'm trading my beloved 1.8T GTI on this STi. With that motor guys will often pull the head and pan, push the pistons and rods out, swap to a set of Integrated Engineering rods and, using the factory pistons and rings, deglaze and reassemble and get 400whp with a BT swap. Why the hell couldn't Subaru have used stronger internals on this engine?


Anyway, maybe I'm jumping to conclusions here. OP, you say "I've tried to replicate this issue on the stock airbox on the stock tune but no dice." IOW, if you put the stock box back on you don't get misfires and cluster Christmas trees anymore? If so, maybe the motor itself is okay internally and you either need to stay stock or get a proper tune as advised by others.

Just add forged pistons, the stock rods and all should be safe at around 500whp but keeping the torque down will help.


Btw, the stock airbox keeps the maf happy aka keeps the tune easy for the tuner. I'm in a rush, but in a nutshell, keep the stock airbox or go speed density...aftermarket intakes all suck!
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Old 07-11-2013, 08:09 PM   #7
mechatricity
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Member#: 290592
Join Date: Aug 2011
Chapter/Region: South East
Location: Charlotte, NC
Vehicle:
04 & 06 WRX Wagons
'15 WRX 6MT CWP

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Quote:
Originally Posted by Blackfin View Post
Getting nervous here. I'm picking up a 2010 STi hatch, my first Subaru, on Saturday and reading all these stories of potential ring land damage happening on lightly-modded cars is scaring the hell out of me.

I've got a 2002 Mustang 4.6 with an intercooled Kenne Bell blower on it and at 9-psi it's putting right around 400rwHP. This engine has fragile hypereutectic pistons but will live at that power level pretty comfortably with conservative timing and fat fuel. I can't blame Ford for using these pistons in a naturally aspirated engine but I'm really disappointed to see that a factory turbo motor was qualified with glass pistons.

I'm trading my beloved 1.8T GTI on this STi. With that motor guys will often pull the head and pan, push the pistons and rods out, swap to a set of Integrated Engineering rods and, using the factory pistons and rings, deglaze and reassemble and get 400whp with a BT swap. Why the hell couldn't Subaru have used stronger internals on this engine?


Anyway, maybe I'm jumping to conclusions here. OP, you say "I've tried to replicate this issue on the stock airbox on the stock tune but no dice." IOW, if you put the stock box back on you don't get misfires and cluster Christmas trees anymore? If so, maybe the motor itself is okay internally and you either need to stay stock or get a proper tune as advised by others.
This has been a problem since 2006 or before- so...homework, homework, homework.
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Old 07-11-2013, 08:26 PM   #8
microsnook
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Member#: 313952
Join Date: Mar 2012
Location: Central FL
Vehicle:
2006 STi
SGM DOM 3xt-r

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My 06 just did this the other day. Not sure what was causing it...
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