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Old 01-08-2013, 04:49 PM   #1
dasilveira
Scooby Newbie
 
Member#: 300244
Join Date: Nov 2011
Default Misfire cylinder 4, tried lots and out of ideas. Please help

Hey guys I drive a 2005 Wrx Sti with mods

I will list the mods of the vehicle at the bottom

sorry for the vid was very hard to do it all at once lol

http://imageshack.us/clip/my-videos/545 ... kmkhp.mp4/

ok so a couple of days ago I noticed that when i start to spool it peaks at like 15psi and sounds like its spitting/releasing pressure or some sort, even tho im tunned to 22psi. And When i hit the max 15psi my engine check lights come on and starts to blink. After driving normal for a few seconds after the pull the light goes away. So when I got home I scanned the code, and the code was p0304 which is misfire cylinder 4. I previously had many problem with misfire cylinder 4 and well I guess everything I've done hasn't fixed the problem.

Till this day I have tried to:

Swapped injectors from cylinder 3 and 4
Swaped coil pack from cylinder 3 and 4
Swaped with different coil packs
Swaped spark plugs from cylinder 3 and 4
Swaped with different spark plugs
Compression test
Boost leak test (I think I got all the leaks) but not sure

I don't no what els to try to get this problem Fixed

Here are vehicle modification to engine:

Tuner: Chris @ tonic*
Dyno Jet
Wheel HP: 417
Wheel TQ: 403

Engine and exhaust:
Turbo: Tomioka TD06 20G forge waste gate 1.7bar
Intercooler: Turbo XS FMIC
Injectors: DeatschWerks 850cc
Intake/Inlet: Perrin big maf
Headers: APS equal lenght twin scroll to single scroll headers
Uppipe: APS twin scroll to single scroll uppipe
Downpipe: Helix hi flow catted downpipe
CBE: HKS hi power catback exhaust*
Walbro 255 fuel pump*
TGV delete
Grimspeed 8mm phenolic spacer
Grimspeed EBCS
Turbo XS blow out valve
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Last edited by dasilveira; 01-08-2013 at 04:56 PM. Reason: New info
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Old 01-08-2013, 04:51 PM   #2
the suicidal eggroll
Scooby Guru
 
Member#: 51961
Join Date: Jan 2004
Chapter/Region: RMIC
Location: Broomfield, CO
Vehicle:
2005 STi
2012 WRX

Default

Have you made any logs? Do you have a wideband?
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Old 01-08-2013, 05:42 PM   #3
dasilveira
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Member#: 300244
Join Date: Nov 2011
Default

No I don't have a wideband, and I'm not sure if the runner did any logs or not
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Old 01-08-2013, 06:40 PM   #4
the suicidal eggroll
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Member#: 51961
Join Date: Jan 2004
Chapter/Region: RMIC
Location: Broomfield, CO
Vehicle:
2005 STi
2012 WRX

Default

Well it's time for you to do some logging. It sounds like it could be a massive AFR problem, hard to tell.
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Old 01-08-2013, 08:28 PM   #5
Elbert Bass
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Member#: 283429
Join Date: May 2011
Chapter/Region: South East
Location: South East TN
Vehicle:
1995 Chevy S-10
White

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Have you performed a cylinder leakage test?
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Old 01-08-2013, 08:29 PM   #6
KurtP
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Member#: 44836
Join Date: Oct 2003
Chapter/Region: MAIC
Vehicle:
1999 Fozzy
silver

Default

Im with eggroll. I'd get that thing to a local shop that has a dyno with a wideband set up and see what the A/F is doing under load.

You've hit the big easies with this problem already, so my guess is you are having a fuel delivery problem.

Other than that a leakdown test is the only other thing that comes to mind immediately.
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Old 01-08-2013, 09:15 PM   #7
dasilveira
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Member#: 300244
Join Date: Nov 2011
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ok well i made an appointment with my tuner on Saturday, and ya he uses the wideband i just asked them haha. and depending on what he says i might do the leak down test after
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Old 04-14-2013, 04:43 PM   #8
jaypt802
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Member#: 149730
Join Date: May 2007
Chapter/Region: Tri-State
Vehicle:
2002 Impreza WRX
PSM

Default

Any updates from the op? I'm have a very similar problem.
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