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Old 10-19-2009, 03:11 PM   #1
skatevolcom06
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Member#: 199522
Join Date: Jan 2009
Chapter/Region: RMIC
Location: Elko, NV
Vehicle:
2004 Impreza STi
PsM

Default WTF, need some input

So this summer some of you knew I had some problems with my STI and misfires on cyl. 2 and 4. Well for the last couple months I have not been driving it and have been saving for a new engine.

Well I took it to a local shop for a comp test and leak down test to make damn sure it was the engine before I purchased a new short block.

Results were 110 across the board....?

So now to what is causing the misfire. The mechanic told me it may be an intake manifold leak? The car has all new injectors, I have tried new coilpacks, new ngk plugs one step colder.

All I know is that I am super stoked now but I still have problems. Anyone else ever have this problem?

Mods are; FP green, PE850, FMIC, 3" Catless and I am not sure if any of the other mods really matter.

I know when John was tuning my car cyl 2 and 4 had a slight roughness and he was having troubles tuning it.

Help please!
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Old 10-19-2009, 03:14 PM   #2
bhhamblin
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Join Date: Oct 2005
Chapter/Region: RMIC
Location: Clinton, UT
Vehicle:
13 STI, 83 DR30
93 R32 GTS-T, 93 R32 GTR

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aftermarket flywheel?
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Old 10-19-2009, 03:20 PM   #3
skatevolcom06
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PsM

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nope, stock clutch and flywheel
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Old 10-19-2009, 03:22 PM   #4
skatevolcom06
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2004 Impreza STi
PsM

Default

It still runs good tho, this is from this weekend

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Old 10-19-2009, 03:25 PM   #5
medamullet
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Location: Man of Mystery
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2006 SGM STI
I'm on CORN YO!

Default

Quote:
Originally Posted by skatevolcom06 View Post
So this summer some of you knew I had some problems with my STI and misfires on cyl. 2 and 4. Well for the last couple months I have not been driving it and have been saving for a new engine.

Well I took it to a local shop for a comp test and leak down test to make damn sure it was the engine before I purchased a new short block.

Results were 110 across the board....?

So now to what is causing the misfire. The mechanic told me it may be an intake manifold leak? The car has all new injectors, I have tried new coilpacks, new ngk plugs one step colder.

All I know is that I am super stoked now but I still have problems. Anyone else ever have this problem?

Mods are; FP green, PE850, FMIC, 3" Catless and I am not sure if any of the other mods really matter.

I know when John was tuning my car cyl 2 and 4 had a slight roughness and he was having troubles tuning it.

Help please!

You need a better tune. I would change maps and see if it clears up the problem.... You are not the first person I have heard about with misfire codes from Johns tune.
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Old 10-19-2009, 03:45 PM   #6
Not-EWRX
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Location: SLC
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You were out at tear apart auto this weekend wern't you!.
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Old 10-19-2009, 05:40 PM   #7
skatevolcom06
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PsM

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Quote:
Originally Posted by Not-EWRX View Post
You were out at tear apart auto this weekend wern't you!.

Yes I was! We were pulling a tranny for my friends Cavalier.
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Old 10-20-2009, 12:51 AM   #8
skatevolcom06
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PsM

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the shop also pulled these codes, which are new to me.

P0122 Throttle position sensor circuit low input
P0123 Throttle position sensor circuit high input
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Old 10-20-2009, 09:00 AM   #9
medamullet
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Sometimes when I tinker with my car I get those cars on initial start up. I reset and they don't come back. Are yours coming on all the time?
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Old 10-20-2009, 10:13 AM   #10
skatevolcom06
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PsM

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yeah, I am guessing those two codes are the culprits when my car goes into limp mode. I will just be driving and all of a sudden it will just die out until it goes under 3k rpm and then it feels like i am driving a honda and it wont let me rev over 3k rpms.

It did this to me a few times while driving to SLC this weekend, it sucks when you are going down the free way and your car just dies out, haha.
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Old 10-20-2009, 11:28 AM   #11
Kastley85891
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Chapter/Region: TXIC
Location: TX/Austin
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2013 Hybrid
Needs an 05STI

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Check the wiring connections on your throttle inlet/ DBW unit, check connectors for pinches or frays, maybe even moisture breakdown dude.
Have you had the IC off recently? or any work in that area?
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Old 10-20-2009, 11:59 AM   #12
Stames_wiltz
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Obsidian Black Pearl

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Your AVCS Solenoid on cyl. #2 and #4 may be going bad.
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Old 10-20-2009, 12:21 PM   #13
skatevolcom06
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Join Date: Jan 2009
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Location: Elko, NV
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2004 Impreza STi
PsM

Default

Quote:
Originally Posted by Kastley85891 View Post
Check the wiring connections on your throttle inlet/ DBW unit, check connectors for pinches or frays, maybe even moisture breakdown dude.
Have you had the IC off recently? or any work in that area?
Nope, no work has been done for a while on this car. Also I am FMIC, but I did notice that the elbow off of the turbo does press up against the harness on the throttle body. I will take a picture tonight after work.

Quote:
Originally Posted by Stames_wiltz View Post
Your AVCS Solenoid on cyl. #2 and #4 may be going bad.
Do these commonly go out and cause misfire codes? I am not to familiar with the AVCS.
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Old 10-20-2009, 02:03 PM   #14
Stames_wiltz
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Not super common, but they do go out. When they go bad you will get misfires.
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Old 10-20-2009, 02:46 PM   #15
skatevolcom06
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2004 Impreza STi
PsM

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Quote:
Originally Posted by Stames_wiltz View Post
Not super common, but they do go out. When they go bad you will get misfires.

Would they also cause an erratic idle?
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Old 10-20-2009, 02:51 PM   #16
skatevolcom06
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2004 Impreza STi
PsM

Default

I think I am going to pull the AVCS banjo bolt filter out, hopefully that helps with my Idle issues.
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Old 10-20-2009, 04:23 PM   #17
Stames_wiltz
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Quote:
Originally Posted by skatevolcom06 View Post
Would they also cause an erratic idle?
I am confident that it might.
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Old 10-21-2009, 10:36 PM   #18
skatevolcom06
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2004 Impreza STi
PsM

Default

Ok, well its going to Solid on the 30th to install my EWG setup and try to find my issues.
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