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Old 11-20-2012, 04:14 PM   #1
bmm590
Scooby Newbie
 
Member#: 249196
Join Date: Jun 2010
Chapter/Region: MAIC
Location: Downingtown, Pa
Vehicle:
2014 Impreza WRX
Crystal Black Silica

Default p0301+p0303....stumped

My WRX with ~ 90k has had misfire on 1 and 3 cylinders. I've tried numerous things, and I'm reaching out in hope that someone can shed some light on this problem before taking it to a shop.

MOD LIST:
-GMS turbo inlet
-3 inch TBE and uppipe (catless)
-COBB stage 2 OTS tune

What I have tried:
-Cleaned MAF/replaced gasket
-Cleaned IACV/replaced gasket
-New plugs
-Moved injectors and coils to other bank (in hopes misfire would follow -- with no luck)
-New fuel filter and PCV valve
-Boost leak, compression, and leak down test with positive results on all
-Checked timing (belt was done at 65k)
-Checked and cleaned crank and cam sensors
-Checked and cleaned all grounds
-Swapped ECUs with friend
-Cleaned boost control solenoid (stock)
-Replaced front o2 sensor
-Replaced ALL exhaust gaskets
-Sprayed ALL vacuum hoses and intake manifold gasket with starting fluid

Idle sometimes gets a little rough but RPMs do not fluctuate. When I view the freeze data it is always at idle, or take-off that the codes appear.

Do not ask me to read the misfire thread because I have done everything on the list. I will post the freeze frame data in hopes that someone will shed light on the issue.
Thanks in advance
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Old 11-20-2012, 04:16 PM   #2
bmm590
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Member#: 249196
Join Date: Jun 2010
Chapter/Region: MAIC
Location: Downingtown, Pa
Vehicle:
2014 Impreza WRX
Crystal Black Silica

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Old 11-20-2012, 05:57 PM   #3
skanitz1
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Member#: 184209
Join Date: Jul 2008
Default

Is it showing any other codes at all? Do you have the stock intake aside from the gms inlet? It's pulling about 10% fuel for some reason, I would try checking again for a vacuum leak. Also, is your downpipe catless? If so, do you have the rear O2 tuned out? The correction for it is -100%. I'm not sure what all the cobb map entails though... hope this helps.
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Old 11-21-2012, 09:41 AM   #4
quazimoto
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Member#: 70395
Join Date: Sep 2004
Chapter/Region: MAIC
Location: Da-boonies,Va
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Quote:
Originally Posted by bmm590 View Post

Do not ask me to read the misfire thread because I have done everything on the list.
And you checked the valve clearances?
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Old 11-21-2012, 12:01 PM   #5
ogboot
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Member#: 170906
Join Date: Feb 2008
Chapter/Region: South East
Vehicle:
2002 WRX
psm

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Quote:
Originally Posted by skanitz1 View Post
If so, do you have the rear O2 tuned out? The correction for it is -100%. I'm not sure what all the cobb map entails though... hope this helps.
Rear O2 is only for emissions on the pre-2.5L models (2002-03wrx, etc.). It's not sniffing the exhaust tract for the ECU's sake, the only O2 that matters on the ej205 is the front sensor. You can remove the rear sensor and you'll get a code but it doesn't affect the car.
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Old 11-21-2012, 12:03 PM   #6
ogboot
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Member#: 170906
Join Date: Feb 2008
Chapter/Region: South East
Vehicle:
2002 WRX
psm

Default

Quote:
Originally Posted by quazimoto View Post
And you checked the valve clearances?
Quazi knows. You're at almost 100k that's common valve adjustment time for the 2.0L.
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