|01-08-2013, 05:49 PM||#1|
Join Date: Nov 2011
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
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*
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*
Grimspeed 8mm phenolic spacer
Turbo XS blow out valve
* Registered users of the site do not see these ads.
Last edited by dasilveira; 01-08-2013 at 05:56 PM. Reason: New info
|01-08-2013, 07:40 PM||#4|
Join Date: Jan 2004
Location: Broomfield, COVehicle:
Well it's time for you to do some logging. It sounds like it could be a massive AFR problem, hard to tell.
|01-08-2013, 09:29 PM||#6|
Join Date: Oct 2003
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.
|01-08-2013, 10:15 PM||#7|
Join Date: Nov 2011
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