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Old 02-04-2008, 08:33 PM   #1
pints99
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Member#: 100020
Join Date: Nov 2005
Default 06 sti throwing codes and hesitating badly

I recently passed the 2 year mark on my car and have currently 73,000 miles. Most especially when cold, but still sometimes when the car is warm, the car will hesitate and buck under partial throttle (~5-15% throttle). I recently had my 60,000 mile service which replaced my spark plugs, so I'm pretty sure they are not the issue. My accessport pulls codes p0301, p0302, p0303, p0304, and then gives me to sets of question marks, I guess it doesn't know the other codes or is confused otherwise. I've made an appointment with subaru to check it out, however I was wondering if anyone else has had a similar problem and could share it with me. Only mods are the accessport set on stage one 91 octane map. Reverting to stock map does not alleviate the issue. Thanks for you help guys.

I have checked the code lists online and those 4 codes indicate misfire on cylinders 1-4.
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Old 02-04-2008, 08:39 PM   #2
nhat
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Member#: 140163
Join Date: Feb 2007
Chapter/Region: MAIC
Location: 3MI Racing
Vehicle:
03 STi
hellaflunctional

Default

the accessport isn't a code reader. go to a local parts store and use their obd2 code reader instead.

report back.
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Old 02-04-2008, 09:05 PM   #3
makeawish
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I'm no mechanic, but I do troubleshoot computers and 90% of the time the cause to a problem is something that recently changed. Were the plugs changed 13,000 mile ago or recently..

If it was recent and the only change was your plugs, maybe they are bad. Just because they are new doesn't make them good. Could be wrong part number, wrong gap, bad connections...

then again it could be anything.. I wish you luck and hope it's a $2 part. please post a followup when it's diagnosed..
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Old 02-04-2008, 09:51 PM   #4
pints99
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Join Date: Nov 2005
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Quote:
Originally Posted by makeawish View Post
I'm no mechanic, but I do troubleshoot computers and 90% of the time the cause to a problem is something that recently changed. Were the plugs changed 13,000 mile ago or recently..

If it was recent and the only change was your plugs, maybe they are bad. Just because they are new doesn't make them good. Could be wrong part number, wrong gap, bad connections...

then again it could be anything.. I wish you luck and hope it's a $2 part. please post a followup when it's diagnosed..
The problem began before the maintenance. I thought it was the plugs too...but they have since been changed and the problem remains. I've tried a few different maps on the computer and reverted it completely to stock and none of that seems to work. That leads me to think it's a mechanical problem. It's much less or non-existant after the car has been running 10 minutes or so.
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