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Old 07-30-2013, 10:52 AM   #1
EEkShh
Scooby Newbie
 
Member#: 317977
Join Date: Apr 2012
OMGHi2U Misfires-not throwing codes...anymore

Hey guys a little backround:

I have an 02 WRX, pretty much stock so far only and AEM short ram (Which I took off) and a Turbo XS 50/50(I recently swapped back to the stock one with a new gasket). When I first got car I was not throwing any cells. About 6 months past, got into winter and all of the sudden I'm throwing misfire codes on Cyl 1 and 4. It can randomly popup at times, but the majority of the time it early in the morning when it is very cold, and only once the car gets to operating temperature, and the code shows up. I look at the code history and everytime it shows that the code pops on at 733rpm and no engine load. This morning I left for work and attempted to accelerate at about 3/4 throttle and the engine fell on its face, I let off the gas and it returned to normal. It was boosting 14.5 psi but now will only boost to a max of 6.6lbs(I've since fixed this-by replacing the boost solenoid). The IAM or DAM is at 16 so it shouldnt be running in "limp" mode. I've read a lot of forum posts and tried quite a few t/s steps but as these misfire codes seem to be a common issue I figure this a perfect place to share information (and help me get this figured out) Other good information...awhile back I had a friend hook up a tactrix and drive around with me and we noticed that at about 3k rpm the ecu is pulling timing.


- I'm not burning oil
-Compression tests came out good
-I'm not losing coolant
-I'm not blowing any smoke out the tail pipe
-I am no longer throwing any codes(only misfires in the winter)
-Issue remains

What I've done so far;

- Cleaned grounds(Intake manifold, ground by pitch mount, main ground from battery etc)
- Run several fuel injector cleaners thru the system
- replaced the fuel filter
- replaced spark plugs (stock factory recommended plugs and gap)
- double checked coil pack connections, white plugs in front, black plugs in back
- cleaed connections
- removed coilpacks and cleaned mounting surface
- replaced turbo inlet hose (was torn badly, post maf un-metered air)
- cleaned MAF very gently
- replaced cracked vacuum hosing(and replaced the pill)
- checked intercooling pipe, hoses
-cleaned IACV
**Recently**
*Swapped coilpacks 1 to 3 and 2 to 4
*performed boost leak test
*com,presion tested all 4 at 120 (I forgot to pull the fuel pump fuse and hold at WOT while testing)
*changed sparkplugs to factory part number, verified correctly gapped
*Bought an Access Port, Flashed to Stage 1 OTS
*Returned to the stock OEM Map
*Tested for boost leak- No leak present
*Replaced Intake Manifold and TGV gaskets
*Replaced injectors with know good ones (stock injectors)
*went thru entire Vacuum system and replaces all lines
*Replaced all PCV breather lines
*Replaced PCV valve
*Ran Sea Foam thru Vacuum line to clean carbon build up
*Recleaned all grounds
*Replaced the "blue vacuum t-fitting" behind the alternator
*Replaced boost solenoid- boost returned to normal
*Removed AEM intake, went back to stock
*Replaced Stock FPR with Tomei FPR


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Old 07-30-2013, 07:57 PM   #2
KFREX
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Member#: 330609
Join Date: Aug 2012
Chapter/Region: SCIC
Location: Los Angeles, CA
Vehicle:
2004 Subaru WRX
Java Pearl Black

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I really hope you figure this out, I am in a similar situation and its tearing my brain apart.
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Old 07-31-2013, 02:59 PM   #3
EEkShh
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Member#: 317977
Join Date: Apr 2012
Default Me TOO

Me Too, I'm losig my mind on this one. I've never been stumped by a car issue but this one is kicking my a$$! I've been monitoring my front o2 sensor and it seems a bit lazy but no code. Might try swapping o2 sensor with a know good one and see if that helps. I'm really running out of ideas. I talked to my local Subaru dealership and they said they had two stock maps released by Corporate Subaru for misfires and pinging. He said that Subaru doesnt release this info and the only way you find out about this map is by finding info on the forum. They said they would reflash my ecu for 60 bucks with the most recent Ping/Misfire fix map. I thought that maybe the issue however I did flash to an Cobb AP Stage 1 Tune and the issue persisted. I'm starting to wonder tho, if maybe the stock map changes some parameters that the Cobb access port does not change. I'll let you know when I figure this out.
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Old 07-31-2013, 09:39 PM   #4
hoffmanEstates
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Member#: 122043
Join Date: Aug 2006
Chapter/Region: MWSOC
Location: aurora
Vehicle:
04 wagonier
psm

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Try buying new packs, i did at 100k as they are a wear item and fail at any point
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Old 07-31-2013, 09:56 PM   #5
2gnt2wrx
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Member#: 123625
Join Date: Aug 2006
Chapter/Region: MWSOC
Location: Waukesha, WI
Vehicle:
2002 wrx
wrb stg2

Default

Before you go spending more money clean your crank angle sensor and cam angle sensor. The problem has nothing to do with your stock map.

And read this, http://forums.nasioc.com/forums/show....php?t=2318069

Last edited by 2gnt2wrx; 07-31-2013 at 10:05 PM.
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Old 08-01-2013, 10:26 AM   #6
EEkShh
Scooby Newbie
 
Member#: 317977
Join Date: Apr 2012
Default Thanks

Quote:
Originally Posted by 2gnt2wrx View Post
Before you go spending more money clean your crank angle sensor and cam angle sensor. The problem has nothing to do with your stock map.

And read this, http://forums.nasioc.com/forums/show....php?t=2318069

Thanks I will try that and report back. I already swapped coilpacks with my buddies bugeye with no change so I know its not them. The clips are solid and not broken and stay on with no issues. Have you hada simalar issue on your 2002
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Old 08-01-2013, 10:29 AM   #7
EEkShh
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Member#: 317977
Join Date: Apr 2012
Default

And read this, http://forums.nasioc.com/forums/show....php?t=2318069

I've actually read thru that forum post several times but for some reason skipped over it
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Old 08-02-2013, 12:39 PM   #8
EEkShh
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Member#: 317977
Join Date: Apr 2012
Default

Checked Cam sensor last night, It had a little dust on it, cleaned it off but no change. Will pull the alternator this weekend and check the Crank Sensor
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