WTF, need some input

skatevolcom06 · 10-19-2009, 03:11 PM

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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bhhamblin · 10-19-2009, 03:14 PM

aftermarket flywheel?

skatevolcom06 · 10-19-2009, 03:20 PM

nope, stock clutch and flywheel

skatevolcom06 · 10-19-2009, 03:22 PM

It still runs good tho, this is from this weekend

YouTube - Wendover salt flats STI

medamullet · 10-19-2009, 03:25 PM

Quote:

Originally Posted by skatevolcom06

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.

Not-EWRX · 10-19-2009, 03:45 PM

You were out at tear apart auto this weekend wern't you!.

skatevolcom06 · 10-19-2009, 05:40 PM

Quote:

Originally Posted by Not-EWRX

You were out at tear apart auto this weekend wern't you!.

Yes I was! We were pulling a tranny for my friends Cavalier.

skatevolcom06 · 10-20-2009, 12:51 AM

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

medamullet · 10-20-2009, 09:00 AM

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?

skatevolcom06 · 10-20-2009, 10:13 AM

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.

Kastley85891 · 10-20-2009, 11:28 AM

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?

Stames_wiltz · 10-20-2009, 11:59 AM

Your AVCS Solenoid on cyl. #2 and #4 may be going bad.

skatevolcom06 · 10-20-2009, 12:21 PM

Quote:

Originally Posted by Kastley85891

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

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.

Stames_wiltz · 10-20-2009, 02:03 PM

Not super common, but they do go out. When they go bad you will get misfires.

skatevolcom06 · 10-20-2009, 02:46 PM

Quote:

Originally Posted by Stames_wiltz

Not super common, but they do go out. When they go bad you will get misfires.

Would they also cause an erratic idle?

skatevolcom06 · 10-20-2009, 02:51 PM

I think I am going to pull the AVCS banjo bolt filter out, hopefully that helps with my Idle issues.

Stames_wiltz · 10-20-2009, 04:23 PM

Quote:

Originally Posted by skatevolcom06

Would they also cause an erratic idle?

I am confident that it might.

skatevolcom06 · 10-21-2009, 10:36 PM

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

10-19-2009, 03:11 PM	#1
skatevolcom06 Scooby Specialist Member#: 199522 Join Date: Jan 2009 Chapter/Region: RMIC Location: Elko, NV Vehicle: 2004 Impreza STi PsM	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! * Registered users of the site do not see these ads.

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10-19-2009, 03:14 PM	#2
bhhamblin n00b Moderator Moderator Member#: 99397 Join Date: Oct 2005 Chapter/Region: RMIC Location: Clinton, UT Vehicle: '13 BRZ, '13 STi SRs13 '83 Skyline '93 GTR	aftermarket flywheel?

10-19-2009, 03:20 PM	#3
skatevolcom06 Scooby Specialist Member#: 199522 Join Date: Jan 2009 Chapter/Region: RMIC Location: Elko, NV Vehicle: 2004 Impreza STi PsM	nope, stock clutch and flywheel

10-19-2009, 03:45 PM	#6
Not-EWRX Scooby Specialist Member#: 158043 Join Date: Aug 2007 Chapter/Region: RMIC Location: SLC Vehicle: old Something new SWP	You were out at tear apart auto this weekend wern't you!.

10-20-2009, 12:51 AM	#8
skatevolcom06 Scooby Specialist Member#: 199522 Join Date: Jan 2009 Chapter/Region: RMIC Location: Elko, NV Vehicle: 2004 Impreza STi PsM	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

10-20-2009, 09:00 AM	#9
medamullet Scooby Guru Member#: 99442 Join Date: Oct 2005 Chapter/Region: International Location: Man of Mystery Vehicle: 2006 SGM STI I'm on CORN YO!	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?

10-20-2009, 10:13 AM	#10
skatevolcom06 Scooby Specialist Member#: 199522 Join Date: Jan 2009 Chapter/Region: RMIC Location: Elko, NV Vehicle: 2004 Impreza STi PsM	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.

10-20-2009, 11:28 AM	#11
Kastley85891 Scooby Specialist Member#: 127704 Join Date: Oct 2006 Chapter/Region: TXIC Location: TX/Austin Vehicle: 2013 Leggy Scooby no4 - huntin for 5	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?

10-20-2009, 11:59 AM	#12
Stames_wiltz Scooby Specialist Member#: 143264 Join Date: Mar 2007 Chapter/Region: RMIC Location: Utah Vehicle: 2006 WRX TR Obsidian Black Pearl	Your AVCS Solenoid on cyl. #2 and #4 may be going bad.

10-20-2009, 02:03 PM	#14
Stames_wiltz Scooby Specialist Member#: 143264 Join Date: Mar 2007 Chapter/Region: RMIC Location: Utah Vehicle: 2006 WRX TR Obsidian Black Pearl	Not super common, but they do go out. When they go bad you will get misfires.

10-20-2009, 02:51 PM	#16
skatevolcom06 Scooby Specialist Member#: 199522 Join Date: Jan 2009 Chapter/Region: RMIC Location: Elko, NV Vehicle: 2004 Impreza STi PsM	I think I am going to pull the AVCS banjo bolt filter out, hopefully that helps with my Idle issues.

10-21-2009, 10:36 PM	#18
skatevolcom06 Scooby Specialist Member#: 199522 Join Date: Jan 2009 Chapter/Region: RMIC Location: Elko, NV Vehicle: 2004 Impreza STi PsM	Ok, well its going to Solid on the 30th to install my EWG setup and try to find my issues.